changelog.in

#
#  Main authors:
#     Christian Schulte <schulte@gecode.dev>
#     Guido Tack <tack@gecode.dev>
#     Mikael Zayenz Lagerkvist <lagerkvist@gecode.dev>
#
#  Copyright:
#     Christian Schulte, 2005
#     Guido Tack, 2026
#     Mikael Zayenz Lagerkvist, 2026
#
#  This file is part of Gecode, the generic constraint
#  development environment:
#     http://www.gecode.dev
#
#  Permission is hereby granted, free of charge, to any person obtaining
#  a copy of this software and associated documentation files (the
#  "Software"), to deal in the Software without restriction, including
#  without limitation the rights to use, copy, modify, merge, publish,
#  distribute, sublicense, and/or sell copies of the Software, and to
#  permit persons to whom the Software is furnished to do so, subject to
#  the following conditions:
#
#  The above copyright notice and this permission notice shall be
#  included in all copies or substantial portions of the Software.
#
#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
#  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
#  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
#  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
#  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
#  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
#  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#

#
# This file contains entries for changelogs
#
# There are two kinds of entries: one marking releases and the others
# being actual entries.
#
# All the lines for describing entries must start at the beginning.
#
# A release is described as follows:
#   [RELEASE]
#   Version: <version string>
#   Date:    <when release>
#   [DESCRIPTION]
#   ... All the text up to the next [ENTRY] is included
#   as description
#
# An entry is described as follows:
#   [ENTRY]
#   Module:
#     kernel|search|int|set|float|cpltset|scheduling|graph|minimodel|
#     driver|iter|support|example|test|gist|flatzinc|other
#   What:   bug|documentation|performance|new|removed|change
#   Rank:   minor|major
#   Bug:    <optional, for number from bugzilla>
#   Issue:  <optional, for number from github>
#   Thanks: <optional, who reported etc>
#   [DESCRIPTION]
#   ... All the text up to the next [ENTRY] or [RELEASE] is included
#   as description
#   [MORE]
#    ... If a more section is included, then it will be displayed as an
#    optional section in the html page.
#

[RELEASE]
Version: 6.5.0
Date: unreleased
[DESCRIPTION]
This is the development changelog for the next Gecode release.

[ENTRY]
Module: search
What:   new
Rank:   major
[DESCRIPTION]
Add Search::WorkerControl for asynchronously adjusting how many pre-created
workers a parallel DFS or BAB engine may execute. Controls also apply to leaf
engines owned by RBS and PBS. Callers can redistribute a fixed worker budget
without rebuilding the engines. Requesting zero pauses an engine without
discarding its search state or holding a PBS round open.

[RELEASE]
Version: 6.4.0
Date: 2026-07-15
[DESCRIPTION]
This release modernizes the Gecode build infrastructure, adds a
first-class CMake package for downstream consumers, refreshes the
autoconf build path, and updates CI coverage for current platforms.

[ENTRY]
Module: int
What:   bug
Rank:   major
Issue:  166
Thanks: Mats Carlsson
[DESCRIPTION]
Fix domain-level global cardinality propagation losing solutions by counting
assigned variables twice and retaining stale conflict marks when cardinality
bounds shrink.

[ENTRY]
Module: int
What:   bug
Rank:   major
Issue:  168
Thanks: Mats Carlsson
[DESCRIPTION]
Fix non-terminating propagation for sorted constraints when a matching
component contains no interval compatible with an input variable.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Issue:  107
Thanks: Yuri Victorovich
[DESCRIPTION]
Do not install example data headers when examples are disabled in an Autotools
build.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Issue:  108
Thanks: Yuri Victorovich
[DESCRIPTION]
Do not create empty MiniZinc directories when FlatZinc is disabled in an
Autotools build.

[ENTRY]
Module: example
What: bug
Rank: minor
Issue: 151
Thanks: Ioannis Papatsoris
[DESCRIPTION]
Treat zero entries in the TSP example as valid zero-cost edges. This lets the
br17 instance reach its optimum.

[ENTRY]
Module: example
What: bug
Rank: minor
Issue: 83
[DESCRIPTION]
Build CMake examples only when their required variable modules and MPFR support
are enabled.

[ENTRY]
Module: float
What: bug
Rank: major
Issue: 164
Thanks: Pierre Talbot
[DESCRIPTION]
Compute interval medians without overflowing at large positive or negative
bounds. Float search over an unbounded FlatZinc variable can otherwise fail to
make progress.

[ENTRY]
Module: flatzinc
What: bug
Rank: minor
Issue: 99
[DESCRIPTION]
Keep an explicitly selected Gist execution mode when FlatZinc statistics are
requested, and report an error instead of silently running in solution mode
when Gist support is unavailable.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
Thanks: Jip J. Dekker
[DESCRIPTION]
Add support for the experimental MiniZinc black-box propagator interface,
contributed by Jip J. Dekker.
[MORE]
FlatZinc models can implement custom value and bounds propagation in a shared
library or persistent subprocess. The blackbox_dll and blackbox_exec annotations
select the backend and pass its arguments. Bounds callbacks return enclosing
intervals together with the dependencies that determine when the callback must
run again.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
[DESCRIPTION]
Fix MSVC compilation of matrix slice conversion operators by fully
qualifying their dependent return types.

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
Restore the legacy GIST_STATIC_LIBS compatibility macro for static
Windows clients. GECODE_STATIC_LIBS remains the preferred spelling.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
Issue:  62
Thanks: k0stjap
[DESCRIPTION]
Dispose the random view selector used by random variable branching so
its random generator handle is released when the brancher is discarded.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
Issue:  205
Thanks: intractabilis
[DESCRIPTION]
Fix construction of argument arrays from empty `std::vector` instances
so zero-length copies do not take the address of a nonexistent first
element.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Issue:  139
Thanks: yuri@FreeBSD
[DESCRIPTION]
Fix default-constructed Boolean expressions so they can be used as
empty accumulators for conjunction and disjunction without reading
uninitialized node state.

[ENTRY]
Module: float
What:   bug
Rank:   minor
[DESCRIPTION]
Fix bounds propagation for floating-point power and nth-root
constraints so they no longer report fixpoint prematurely and no
longer call interval nth-root on zero-anchored even-root intervals
that can underflow in Boost interval arithmetic.

[ENTRY]
Module: float
What:   bug
Rank:   minor
[DESCRIPTION]
Fix floating-point multiplication propagation by using direct interval
contraction for the signed product relation. This avoids lossy sign
rewrites that could accept tight non-solution intervals.

[ENTRY]
Module: test
What:   bug
Rank:   minor
[DESCRIPTION]
Fix float power and nth-root tests with shared variables by
initializing their exponent fields and rejecting nth-root test
assignments whose source interval is not fully non-negative.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Issue:  207
Thanks: Nathan Tran
[DESCRIPTION]
Include the upper endpoint when generating FlatZinc on_restart
uniform integer and float values.

[ENTRY]
Module: other
What:   change
Rank:   minor
Issue:  203
Thanks: Bruce Mitchener
[DESCRIPTION]
Avoid rewriting the generated CMake config.hpp file when its
contents have not changed.

[ENTRY]
Module: kernel
What:   bug
Rank:   major
Issue:  211
Thanks: Kris Coester and Alexander Shepil
[DESCRIPTION]
Make failed space cloning transactional. If copying actors, advisors,
local objects, variable implementations, or clone disposal metadata
throws, Gecode now restores the source space and releases the partial
clone without leaving forwarding links, actor lists, or dispose notices
in an inconsistent state.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
Issue:  211
Thanks: Alexander Shepil
[DESCRIPTION]
Harden dispose-notice registration against allocation failure. Actors
are no longer disposed by the space when an AP_DISPOSE registration
fails before ownership has been transferred to the dispose-notice list.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Issue:  211
Thanks: Alexander Shepil
[DESCRIPTION]
Fix exception safety in IntSet object allocation. Partially constructed
IntSet objects now initialize their cleanup state before allocating
range storage and release the object if range allocation fails.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Avoid signed integer overflow when computing integer-domain widths and
holes. Range width calculations now use unsigned arithmetic after
conversion, including full-domain integer ranges.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Issue:  211
Thanks: Alexander Shepil
[DESCRIPTION]
Fix MiniModel expression ownership during allocation failure. Boolean
misc-expression nodes and non-linear integer expression nodes now clean
up partially transferred objects and internal expression arrays while
preserving the public default LinIntExpr zero-expression invariant.

[ENTRY]
Module: search
What:   bug
Rank:   minor
Issue:  150
Thanks: Stefan Brüns
[DESCRIPTION]
Send CPProfiler's DONE message before disconnecting from the
profiler socket.

[ENTRY]
Module: search
What:   bug
Rank:   major
[DESCRIPTION]
Fix sanitizer-detected search issues, including branch-and-bound
recomputation undefined behavior, parallel search command and stop-state
races, PBS slave lifetime hazards, restart-stop state races, stop-object
limit races, and shared no-good accounting races.

[ENTRY]
Module: test
What:   new
Rank:   minor
[DESCRIPTION]
Add opt-in deterministic fault injection and sanitizer build support.
The new fault-injection tests exercise clone, dispose-notice, IntSet,
MiniModel, and heap-allocation failure paths that are otherwise hard to
reproduce reliably.

[ENTRY]
Module: int
What:   performance
Rank:   minor
Issue:  202
Thanks: Fabio Tardivo
[DESCRIPTION]
Strengthen bin-packing propagation with lower bounds based on
dual-feasible functions, improving early detection of infeasible
packing states.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Add selectable TupleSet support representations for extensional integer
constraints.
[MORE]
Tuple sets can use dense, sparse, compressed-dense, or automatic support
selection. Extensional posting selects the matching propagator. DFA-derived
tuple sets accept the same selector, while FlatZinc tables and examples that
materialize larger tuple sets use automatic selection.

A failed finalization leaves the tuple set in a terminal failed state,
reported by failed(); it cannot be finalized again.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Avoid reading past TupleSet range data when a negative compact-table
propagator receives an assignment outside every table range. Positive
compact-table propagators also preserve pending updates when a disabled
space is cloned and later enabled.

[ENTRY]
Module: other
What:   change
Rank:   major
[DESCRIPTION]
Modernize the build infrastructure across CMake and autoconf:
raise CMake minimum version to 3.21, update autoconf macros to
current style, make configure.ac the canonical autoconf source,
and centralize shared version metadata in gecode-version.m4.

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
Prefer Qt 6 for Gist and Qt-backed builds while keeping Qt 5.15+
as the supported legacy baseline. Installed CMake packages now
request the Qt major/minor version used to build Gecode.

[ENTRY]
Module: flatzinc
What:   removed
Rank:   major
[DESCRIPTION]
Remove the public GECODE_FLATZINC_VERSION macro. It described a fixed
FlatZinc language revision that no longer matches the capability-based
MiniZinc interface. Code that only needs the Gecode release should use
GECODE_VERSION; FlatZinc integrations should use the installed MiniZinc
solver metadata instead of gating parser use on a language-version macro.

[ENTRY]
Module: other
What:   change
Rank:   major
[DESCRIPTION]
Migrate build helper scripts from Perl to Python and execute them
via uv. This removes Perl as a build-time dependency and unifies
script execution in autoconf, CMake, and CI.

[ENTRY]
Module: search
What:   bug
Rank:   minor
[DESCRIPTION]
Fix CPProfiler compilation on Windows and MinGW by using the
standard _WIN32 platform guard, guarding MSVC-specific pragmas,
and linking against the Windows socket library where required.

[ENTRY]
Module: other
What:   removed
Rank:   major
[DESCRIPTION]
Remove outdated contrib modules (qecode and quacode) from the
main build, release artifacts, and repository maintenance path.
Downstream users that still need these modules should continue to
use an older Gecode release or maintain them outside the main tree.

[RELEASE]
Version: 6.3.0
Date: 2026-07-07
[DESCRIPTION]
This release contains accumulated FlatZinc, integer, support,
test, and platform updates since Gecode 6.2.0.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Add support for fzn_sliding_among constraints. These are now in the
minizinc standard library and replace the previous Gecode-specific
among_seq constraints.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Add support for fzn_regular_set constraint.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fix GCD calculation for Boolean reified linear constraints.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Add MiniZinc documentation comments to the Gecode-specific library file.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Allow par identifiers in var array initialisers.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Expose the full cumulatives scheduling constraint to MiniZinc.

[ENTRY]
Module: flatzinc
What:   bug
Issue:  171
Rank:   minor
[DESCRIPTION]
Correctly unshare variables for inverse constraint.

[ENTRY]
Module: flatzinc
What:   bug
Issue:  170
Rank:   minor
[DESCRIPTION]
Correctly unshare variables for div and mod constraints.

[ENTRY]
Module: flatzinc
What:   bug
Issue:  169
Rank:   minor
[DESCRIPTION]
Unshare variables for maximum_arg / minimum_arg constraints.

[ENTRY]
Module: int
What:   bug
Issue:  167
Rank:   minor
[DESCRIPTION]
Make extensional (compact-table) constraints check for duplicated variables.
Also fixes the FlatZinc interface to unshare arguments for extensional
constraints.

[ENTRY]
Module: support
What:   change
Rank:   major
[DESCRIPTION]
Replace platform-specific multithreading code with standard C++ threads.

[ENTRY]
Module: test
What:   new
Rank:   minor
[DESCRIPTION]
Add ability to add command line options to a FlatZinc test

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
Thanks: Jip J. Dekker
[DESCRIPTION]
Add the implementation of the experimental "meta-search on restart" FlatZinc
feature. This features enforces search restrictions when the solver restarts,
allowing users to express many types of common meta-search operation. Examples
are (structured) large neighbourhood, lexicographic optimization, and pareto
front optimization.

[ENTRY]
Module: search
What:   new
Rank:   minor
Thanks: Jip J. Dekker
[DESCRIPTION]
Add the reason for restarting to the MetaInfo object available when restarting.

[ENTRY]
Module: other
What:   new
Rank:   minor
Thanks:	Jason Nguyen
[DESCRIPTION]
Set CMake policy for finding OpenGL to be compatible with application bundlers
on new systems.

[ENTRY]
Module: other
What:   new
Rank:   minor
Thanks:	Jip J. Dekker
[DESCRIPTION]
Add optional support for compiling gecode with MPFR using the CMake build
system.

[ENTRY]
Module: search
What:   bug
Rank:   minor
Thanks: Alexis LG
Issue:  156
[DESCRIPTION]
The parallel search engines could in some cases leak memory, when multiple
solutions are produced but not consumed. The fix clears the queue of solutions
on destruction.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Jip J. Dekker
[DESCRIPTION]
The FlatZinc decomposition of "int_pow" would use a zero default value for the
base even raised to a negative value, causing unsatisfiability. The fix
introduces a simpler decomposition that moves the default values for impossible
exponent values to the result.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
Thanks: Jason Nguyen
[DESCRIPTION]
Rewrite "int_pow_fixed" into "gecode_int_pow" rather than using the default
MiniZinc decomposition.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Thanks: Joerg Strebel
Issue:  136
[DESCRIPTION]
Fix compilation without threads

[ENTRY]
Module: gist
What:   change
Rank:   minor
Thanks: Jip J. Dekker
[DESCRIPTION]
Add support for building Gecode Gist with Qt6.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
Thanks: Jip J. Dekker
[DESCRIPTION]
Add support for disjunctive and cumulative on optional variables.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
Thanks: Jip J. Dekker
[DESCRIPTION]
Generate MiniZinc solver configuration for the Gecode FlatZinc using Gist.

[ENTRY]
Module: search
What:   new
Rank:   minor
Thanks: Jip J. Dekker
[DESCRIPTION]
Add RestartStop class to enforce a limit on the amount of restarts conducted
in a search. RestartStop is included in CombinedStop and accessible from the
FlatZinc interface through the --restart-limit flag.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Issue:  128
Thanks: Mattias Grönkvist
[DESCRIPTION]
Distinct propagation (as used by distinct, channel, and circuit) would
sometimes read from uninitialized memory.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Luis Quesada
[DESCRIPTION]
The gecode.mzn file now contains search annotation definitions for action
branching renamed from the previous erroneous and not working activity.

[ENTRY]
Module: other
What:   change
Rank:   major
[DESCRIPTION]
Gecode now requires C++ 11, the support for compiling without C++ 11
has been removed.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Make the region pool thread local.
[MORE]
When running tests in parallel, having a shared pool for regions took too much
time on macOS. This change makes the pool into a thread_local instead.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Use std::atomic for the global propagator identifier counter instead of guarding
using Support::Mutex.
[MORE]
Using a normal int and locking took too much time when running
tests in parallel on macOS.

[ENTRY]
Module: test
What:   new
Rank:   major
[DESCRIPTION]
Tests can now be run using multiple threads. Use the -threads n argument to
the test runner to run the tests using n threads. A value of 0 uses the number
of processing units to set the thread count.
Using 6 parallel threads, running the full test suite went from 4 hours 15 minutes
to 55 minutes on a 6-core machine. While not a perfect speed-up, it significantly
reduces the time to test Gecode.
[MORE]
Due to the high frequency of memory operations when running tests in parallel,
the system allocation on macOS has a hard time keeping up. To get full performance,
we recommend using another allocator, such as for example mimalloc.
Note also that logging and multiple threads for running tests do not work at the
same time.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
Thanks: Jip J. Dekker
[DESCRIPTION]
Automatically generate and install a MiniZinc solver configuration and
install MiniZinc library into the share/minizinc/gecode standard location.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Add versions of element constraints with offsets, to enable fast domain
consistent index set transformations.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Use element-with-offset and 2d element propagators instead of performing
index transformations in MiniZinc.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Accept combined -cp-profiler flag for activating CP-Profiler and always
send information to profiler.

[ENTRY]
Module: driver
What:   change
Rank:   minor
[DESCRIPTION]
Accept combined -cp-profiler flag for activating CP-Profiler instead of
using separate script mode.

[ENTRY]
Module: test
What:   bug
Rank:   minor
[DESCRIPTION]
Fix testing for IntAction, BoolAction, SetAction, FloatAction with
merit functions.

[ENTRY]
Module: flatzinc
What:   change
Issue:  77
Rank:   minor
[DESCRIPTION]
Move parser.tab.hh to parser.tab.hpp, Bison's standard location. This
ensures that the generated implementation file is compatible with
Bison 3.7.

[ENTRY]
Module: flatzinc
What:   bug
Issue:  61
Rank:   minor
[DESCRIPTION]
Fix fzn_table_bool and fzn_table_bool_reif predicates, which had
incorrect types.

[ENTRY]
Module: other
What:   change
Rank:   minor
Issue:  63
Thanks: Markus Elfring
[DESCRIPTION]
Remove usages of reserved identifiers such as __GECODE_KERNEL_HH__ and
_View.
[MORE]
Gecode used to use include guards of the form __GECODE_KERNEL_HH__.
Using a double underscore in an identifier is reserved, and thus
undefined behaviour. Use guards of the form GECODE_KERNEL_HH instead.
Similarly, names with a single leading underscore followed by a
capital letter are also reserved, and usage is thus undefined
behaviour, and are removed.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
[DESCRIPTION]
Add MiniZinc constraint names to FlatZinc errors when applicable and
available.
[MORE]
A constraint name is specified in MiniZinc using a string annotation
"my name" on the constraint item, and is translated into FlatZinc
using the mzn_constraint_name("my name").

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
The cumulative constraint now respects the semantics of the MiniZinc
definition for 0-duration tasks.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
The roots and int_set_channel constraints now work for empty sets and arrays.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
The MiniZinc global constraint library has been updated for MiniZinc
version 2.3.0 and higher, taking advantage of the new library
structure that separates the modelling-level definition of a predicate
from the solver-level one.

[ENTRY]
Module: minimodel
What:   change
Rank:   minor
Thanks:	Marco Correia
[DESCRIPTION]
Do not require that cost for FloatMinimizeSpace (use the maximum
instead) and FloatMaximizeSpace (use the minimum instead) must be
assigned.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
Thanks:	Konstantin Popov
[DESCRIPTION]
Fixed crash when killing the last propagator in a space.

[ENTRY]
Module: example
What:   bug
Rank:   minor
Thanks:	Florian Fontan
[DESCRIPTION]
Do not use size-based symmetry breaking together with CDBF.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
Thanks:	John W. Spirent
[DESCRIPTION]
Some small changes to compile with MSVC 2015 again.

[ENTRY]
Module: int
What:   change
Rank:   minor
Thanks:	John W. Spirent
[DESCRIPTION]
Some small changes to compile with MSVC 2015 again.

[ENTRY]
Module: set
What:   change
Rank:   minor
Thanks:	John W. Spirent
[DESCRIPTION]
Some small changes to compile with MSVC 2015 again.

[ENTRY]
Module: set
What:   bug
Rank:   minor
Thanks:	Mats Carlsson
[DESCRIPTION]
Fix bool-set channel propagator to work correctly when posted
with a fixed set variable.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
Thanks:	Jip J. Dekker
[DESCRIPTION]
Update the error produced by the FlatZinc parser when an integer
literal is outside Gecode's integer limits.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
The number of nodes and failures is now of type unsigned long
long int. Time is now consistently of type double.

[ENTRY]
Module: driver
What:   change
Rank:   minor
[DESCRIPTION]
The number of propagations, nodes, and failures is now of type
unsigned long long int. Time is now consistently of type double.

[ENTRY]
Module: search
What:   change
Rank:   minor
[DESCRIPTION]
The number of nodes and failures in statistics is now of type
unsigned long long int. Time is now consistently of type double.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The number of propagations in statistics is now of type unsigned
long long int.

[ENTRY]
Module: search
What:   bug
Rank:   minor
[DESCRIPTION]
The linear cutoff generator started at zero rather than at the
scale factor.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
For action-based branching heuristics, one can now define whether
failure, propagation, or both should be considered.

[RELEASE]
Version: 6.2.0
Date: 2019-04-12
[DESCRIPTION]
The release enables half-reification in FlatZinc, fixes
indeterminstic behavior for shared branching criteria, and fixes
several aspects for general tracers. It is recommended to upgrade
as soon as possible.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
Thanks:	Jip J. Dekker
[DESCRIPTION]
Enable support for half-reified constraints in the Gecode MiniZinc
library. Half-reified constraints are used when a MiniZinc
expression has to be reified and is detected to be in a positive
context. If no Half-reified constraint has been made available by
solver, the full reification will be used. Half-reifed constraints
in the MiniZinc solver library are declared in the same way as
reified constraints, but are appended by "_imp" instead of "_reif".

[ENTRY]
Module: kernel
What:   bug
Rank:   major
[DESCRIPTION]
For the combination of some constraints (min, max, nvalues, and
some constraints over Boolean variables) with shared variable
selection branching (that is, AFC, Action, and CHB) the behavior
of Gecode was indeterminstic. The indeterminism was based on
using memory addresses for determining the order of variables in
some propagators which in turn affected which propagator might
record failure first and hence influenced the branching decisions.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
For the combination of binpacking and linear constraints with
shared variable selection branching (that is, AFC, Action, and
CHB) the behavior of Gecode was indeterminstic. The indeterminism
was based on using memory addresses for determining the order of
variables which in turn affected which propagator might record
failure first and hence influenced the branching decisions.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added job-shop scheduling example.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added order constraint for two unary scheduling tasks.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
[DESCRIPTION]
Support minimum_arg_bool and maximum_arg_bool constraints.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Use native offset calculation instead of additional constraints
for argmin/argmax constraints.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Add BoolVar versions of argmax and argmin.

[ENTRY]
Module: kernel
What:   change
Rank:   major
Thanks:	Conrad Drescher
[DESCRIPTION]
The logic for recording events for general tracers was seriously
broken as events after a call to status() have been ignored.

[ENTRY]
Module: float
What:   bug
Rank:   minor
Thanks:	Kurt Van Den Branden
[DESCRIPTION]
Restore floating point rounding mode under Windows.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
Thanks:	Conrad Drescher
[DESCRIPTION]
Added TE_POST for default arguments for general tracers.

[ENTRY]
Module: search
What:   removed
Rank:   minor
[DESCRIPTION]
The special constructors for PBS with up to four SEB's have been
removed. Use the SEBs class instead.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Variables to be assigned during search can now be selected with
all available selection criteria available for branching.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Omitting the variable selection criterion is equivalent to
INT_VAR_NONE().

[ENTRY]
Module: set
What:   new
Rank:   major
[DESCRIPTION]
Variables to be assigned during search can now be selected with
all available selection criteria available for branching.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Omitting the variable selection criterion is equivalent to
SET_VAR_NONE().

[ENTRY]
Module: float
What:   new
Rank:   major
[DESCRIPTION]
Variables to be assigned during search can now be selected with
all available selection criteria available for branching.

[ENTRY]
Module: float
What:   new
Rank:   minor
[DESCRIPTION]
Omitting the variable selection criterion is equivalent to
FLOAT_VAR_NONE().


[RELEASE]
Version: 6.1.1
Date: 2019-02-14
[DESCRIPTION]
This release fixes a number of minor issues and adds post events
to general tracers.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Change table and regular predicates to take 1d arrays as arguments.
Otherwise the generated FlatZinc does not typecheck.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Add colon to statistics output to conform with FlatZinc specification.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
Thanks: Conrad Drescher
[DESCRIPTION]
Use locks to guard mutexes in case tracers throw exceptions.

[ENTRY]
Module: search
What:   bug
Rank:   minor
Thanks: Conrad Drescher
[DESCRIPTION]
Use locks to guard mutexes in case tracers throw exceptions.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks: Conrad Drescher
[DESCRIPTION]
exp(0.0) now correctly evaluates to 1.0 (and not 0.0).

[ENTRY]
Module: int
What:   change
Rank:   minor
Thanks: Jens Krueger
[DESCRIPTION]
All constructors and the bool test operator of IntSet have been
made explicit to avoid unintended behavior.

[ENTRY]
Module: other
What:   new
Rank:   minor
Thanks:	Jip J. Dekker
[DESCRIPTION]
Added installation target to the CMake configuration.

[ENTRY]
Module: other
What:   change
Rank:   minor
[DESCRIPTION]
Fix compilation problems with the Microsoft Visual Studio IDE
which uses -permissive- as default, rather than -permissive as
cl.exe does.

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
General tracers now support post events, see MPG for details.

[ENTRY]
Module: other
What:   change
Rank:   minor
Thanks: Jip J. Dekker
[DESCRIPTION]
Removed the use of glibc macros in the architecture selection
process of the boost interval library. This allows for the
compilation on unix machines based on a different implementation
of the C library.

[ENTRY]
Module: example
What:   new
Rank:   minor
Author:	Samuel Gagnon
[DESCRIPTION]
Added example for magic squares with pre-filled instances.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
Author:	Conrad Drescher, Patrick Zimmer
[DESCRIPTION]
Fixed potential deadlock when memory has been exhausted.

[RELEASE]
Version: 6.1.0
Date: 2018-10-17
[DESCRIPTION]
This release adds reified extensional constraints; support for
negative tables; experimental support for counting-based search
(thanks to Samuel Gagnon); and support for standard C++
initializer lists. In addition, the release has lots of bug fixes
and performance improvements. It is highly recommended to switch
as soon as possible!

[ENTRY]
Module: search
What:   change
Rank:   minor
[DESCRIPTION]
Support for the CPProfiler is now enabled by default.

[ENTRY]
Module: int
What:   change
Rank:   minor
Thanks: Sara Frimodig
[DESCRIPTION]
The default propagation for unary has been too weak (likely to
hurt Gecode in the MiniZinc competitions of 2017 and 2018),
now the default is back to maximal propagation.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks: Matthias Balzer
[DESCRIPTION]
Take exponent into account for float expressions with pow
and nroot.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
Thanks: Rui Machado, Jens Krüger
[DESCRIPTION]
The alignment of memory allocated from a Region is now as
prescribed by the maximum of std::max_align_t and
GECODE_MEMORY_ALIGNMENT (which can be re-defined). Please also check
MPG for a tip on alignment of memory handled by Gecode.

[ENTRY]
Module: flatzinc
What:   new
Rank:   major
[DESCRIPTION]
Added native support for reified extensional table constraints.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Added support for reified extensional table constraints.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Added support for negative table for extensional table
constraints.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
Fixed scheduling for Boolean variables (funnily, only occurred
with a newly added propagator).

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Added missing definitions for declarations of creating Home
objects from spaces with propagator and brancher groups.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
Thanks: Gilles Pesant and Samuel Gagnon
[DESCRIPTION]
Introduction of a basic structure for supporting counting-based
search as described in:
S. Gagnon, G. Pesant, Accelerating Counting-Based Search, CPAIOR 2018.
This is only enabled if Gecode has been compiled with the option
--enable-cbs.
[MORE]
A branching option will be added to compatible examples as
counting algorithms are added to constraints.

[ENTRY]
Module: int
What:   new
Rank:   major
Author:	Samuel Gagnon
[DESCRIPTION]
Added experimental support for counting-based search. It can be
enabled by running configure with --enable-cbs. See
examples/qcp.cpp for an example.

[ENTRY]
Module: minimodel
What:   bug
Rank:   major
Thanks:	Robin Eklind
[DESCRIPTION]
Fixed fall through bug for set expressions.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Improved performance of tuple-set extensional constraints by
maybe 15-20% through reordering loops.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Add -t command line option to fzn-gecode, to support new unified
time limit command line option for FlatZinc solvers.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The function shared() for testing whether a view occurs in an
array or whether two arrays contain at least on shared view is no
a simple function and not a member function (which means, use
shared(x,y) instead of x.shared(y)).

[ENTRY]
Module: kernel
What:   removed
Rank:   major
[DESCRIPTION]
Variables cannot any longer be compared by same() and
before(). If you want to compare two variables x and y whether
they are identical, use x.varimp() == y.varimp().

[ENTRY]
Module: int
What:   removed
Rank:   major
[DESCRIPTION]
Variables cannot any longer be compared by same() and
before(). If you want to compare two variables x and y whether
they are identical, use x.varimp() == y.varimp().

[ENTRY]
Module: set
What:   removed
Rank:   major
[DESCRIPTION]
Variables cannot any longer be compared by same() and
before(). If you want to compare two variables x and y whether
they are identical, use x.varimp() == y.varimp().

[ENTRY]
Module: float
What:   removed
Rank:   major
[DESCRIPTION]
Variables cannot any longer be compared by same() and
before(). If you want to compare two variables x and y whether
they are identical, use x.varimp() == y.varimp().

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
Views now are compared by the standard C++ operators "==", "!=",
and "<" (this replaces the same and before functions).

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
Views now are compared by the standard C++ operators "==", "!=",
and "<" (this replaces the same and before functions).

[ENTRY]
Module: set
What:   change
Rank:   major
[DESCRIPTION]
Views now are compared by the standard C++ operators "==", "!=",
and "<" (this replaces the same and before functions).

[ENTRY]
Module: float
What:   change
Rank:   major
[DESCRIPTION]
Views now are compared by the standard C++ operators "==", "!=",
and "<" (this replaces the same and before functions).

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
The SharedArray class now has an equality operator. This fixes
a problem in the FlatZinc interpreter, which is keeping a hash
set of arrays that relies on the equality test.

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
The add function of TupleSet now supports standard initializer
lists but do not any longer support variable argument lists (as
the combination is really confusing).

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
IntArgs now support standard initializer lists but do not any
longer support variable argument lists (as the combination is
really confusing). Now one can write IntArgs c({1,2,3}) for
example.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
DFAs now support standard initializer lists.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
IntSets now support standard initializer lists, for both
individual elements (for example, IntSet s({1,2,3})) as well as
ranges (for example, IntSet s({{1,2},{6,9}})).

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Integer and Boolean variable argument arrays now support standard
initializer lists.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Set variable argument arrays now support standard initializer
lists.

[ENTRY]
Module: float
What:   new
Rank:   minor
[DESCRIPTION]
Float variable argument arrays now support standard initializer
lists.

[ENTRY]
Module: search
What:   change
Rank:   major
[DESCRIPTION]
SEBs now support standard initializer lists but do not any
longer support variable argument lists (as the combination is
really confusing).


[RELEASE]
Version: 6.0.1
Date: 2018-05-21
[DESCRIPTION]
Contains a number of small fixes and one large fix for float
variables (basically, minimodel using float variables would
always lead to overflow and hence throw an exception).

[ENTRY]
Module: float
What:   change
Rank:   major
Thanks:	Kurt Van Den Branden
[DESCRIPTION]
All constraints over float variables now constrain their
variables when being posted to avoid overflow.

[ENTRY]
Module: float
What:   change
Rank:   minor
[DESCRIPTION]
The interval for a float value is now printed between "[" and
"]", whereas the interval for a float variable is printed between
"[[" and "]]".

[ENTRY]
Module: float
What:   bug
Rank:   minor
[DESCRIPTION]
Float values could not be printed.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks: Matthias Balzer
[DESCRIPTION]
Fixed strict inequalities for Float relations.

[ENTRY]
Module: support
What:   bug
Rank:   minor
Thanks: Kari Pahula
[DESCRIPTION]
Fixed compilation problem on 32 bit platforms.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Jip J. Dekker
[DESCRIPTION]
Fixed the initialisation of the random number generator for the
FlatZinc executable. This fix ensures the generator is always
initialised.

[ENTRY]
Module: support
What:   change
Rank:   minor
[DESCRIPTION]
Detect is os_unfair_lock is available at runtime, in order to be able
to support older versions of macOS in the same binaries.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Add support for annotations to control restart strategy.

[RELEASE]
Version: 6.0.0
Date: 2018-02-23
[DESCRIPTION]
This major release fixes many bugs, adds quite some new
functionality, and changes how cloning works (most likely the
biggest change we ever did to %Gecode): the Boolean share argument
is not any longer needed (see how to change your programs in
\ref PageHowToChange_6 "How to Change to Gecode 6.0.0").  The added
functionality includes experimental support for the CPProfiler,
classes for lexicographic optimization (where the cost is defined
by an array of variables), a new much faster implementation of
extensional constraints using tuple sets, and support for tracing
search engines.

[ENTRY]
Module: search
What:   bug
Rank:   minor
[DESCRIPTION]
The statistics for parallel search engines was wrong.

[ENTRY]
Module: search
What:   bug
Rank:   major
[DESCRIPTION]
Fixed several race conditions during the termination of parallel
search engines.

[ENTRY]
Module: support
What:   change
Rank:   minor
[DESCRIPTION]
Replace deprecated OSSpinLock with os_unfair_lock on newer versions
of macOS.

[ENTRY]
Module: search
What:   bug
Rank:   major
[DESCRIPTION]
A sequential portfolio ignored stop objects in certain cases.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Share tables for extensional (table) constraints, DFAs for regular
constraints, and arrays of constants for element constraints.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Change default propagation level to bounds propagation for global
cardinality constraints.

[ENTRY]
Module: support
What:   change
Rank:   minor
[DESCRIPTION]
Bitsets now use 64 bit integers on all 64 bit architectures.

[ENTRY]
Module: search
What:   new
Rank:   major
Author: Kevin Leo, Maxim Shishmarev
[DESCRIPTION]
Added experimental support for the CPProfiler, see MPG for
details. This is only enabled, if Gecode has been configured with
the option --enable-cpprofiler.

[ENTRY]
Module: driver
What:   new
Rank:   major
[DESCRIPTION]
A new mode "-mode cpprofiler" and several command-line arguments
-cpprofiler-* have been added to connect Gecode to the
CPProfiler. For more details, see MPG.

[ENTRY]
Module: driver
What:   change
Rank:   major
[DESCRIPTION]
No hyphen must be given for a command line switch and both "-"
and "--" are automatically added.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
When posting a simple linear constraint (only two variables with
unit coefficients) with default integer propagation level, a
domain consistent propagator is posted. Now a domain consistent
propagator is always posted if the right-hand side constant is
zero and otherwise if the computations required can be done with
normal integers.

[ENTRY]
Module: float
What:   bug
Rank:   minor
Thanks: Matthias Balzer
[DESCRIPTION]
Linear constraints now check whether constant coefficients have
mixed signs (include zero) and throw an exception if yes.

[ENTRY]
Module: float
What:   bug
Rank:   major
Thanks: Matthias Balzer
[DESCRIPTION]
Linear constraints now check properly for numerical overflow.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Add redefinition of disjunctive_strict in terms of cumulative.

[ENTRY]
Module: driver
What:   new
Rank:   major
Thanks:	Roberto Castañeda Lozano
[DESCRIPTION]
Added IntLexMinimizeScript and IntLexMaximizeScript for
lexicographic optimization.

[ENTRY]
Module: minimodel
What:   new
Rank:   major
Thanks:	Roberto Castañeda Lozano
[DESCRIPTION]
Added IntLexMinimizeSpace and IntLexMaximizeSpace for
lexicographic optimization.

[ENTRY]
Module: driver
What:   removed
Rank:   minor
[DESCRIPTION]
Removed the deprecated classes MinimizeScript and MaximizeScript
(use IntMinimizeScript and IntMaximizeScript instead).

[ENTRY]
Module: minimodel
What:   removed
Rank:   minor
[DESCRIPTION]
Removed the deprecated classes MinimizeSpace and MaximizeSpace
(use IntMinimizeSpace and IntMaximizeSpace instead).

[ENTRY]
Module: int
What:   new
Rank:   major
Author: Linnea Ingmar
[DESCRIPTION]
Tuple sets can be initialized from DFAs (and hence regular
expressions).

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Peter Stuckey
[DESCRIPTION]
Perform unsharing even in failed spaces to avoid exceptions in
later constraint posting.

[ENTRY]
Module: minimodel
What:   new
Rank:   major
Author: Matthias Balzer
[DESCRIPTION]
Added reified dom-expressions.

[ENTRY]
Module: minimodel
What:   new
Rank:   major
Author: Matthias Balzer
[DESCRIPTION]
Added relations between integer and set expressions.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   major
Thanks: Andreas Schutt
[DESCRIPTION]
Fix syntax errors in definitions of global cardinality predicates.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Make mzn-gecode script use mzn-fzn if minizinc driver is not present.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
Thanks: Andreas Schutt
[DESCRIPTION]
Add support for int_pow predicate.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Changed accuracy of delta information for integer views (now, all
values between new and old lower/upper bound are reported as
being discarded).

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Tuple sets used for Boolean variables are allowed to contain only
zeros and ones as values.

[ENTRY]
Module: int
What:   removed
Rank:   major
[DESCRIPTION]
Removed IPL_SPEED and IPL_MEMORY as they are not any longer needed.

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
Re-implemented tuple sets for simplicity and ease of use. Please
see MPG for details.

[ENTRY]
Module: int
What:   change
Rank:   major
Author: Linnea Ingmar
[DESCRIPTION]
Replaced extensional implementation by a single implementation
based on the compact-table propagator described in:
J. Demeulenaere et. al., Compact-Table: Efficiently filtering
table constraints with reversible sparse bit-sets, CP 2016. Pages
207-223, LNCS, Springer, 2016. The extensional propagator runs up
to ten times faster than the old implementations.

[ENTRY]
Module: kernel
What:   bug
Rank:   major
[DESCRIPTION]
Fixed virtual method table overwrite bug for Action and CHB.

[ENTRY]
Module: search
What:   bug
Rank:   major
[DESCRIPTION]
Fixed double deletion bug in parallel portfolio-based search.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks:	Massimo Morara
[DESCRIPTION]
Fixed printing of group information for tracing.

[ENTRY]
Module: float
What:   bug
Rank:   minor
Thanks:	Massimo Morara
[DESCRIPTION]
Fixed printing of group information for tracing.

[ENTRY]
Module: set
What:   bug
Rank:   minor
Thanks:	Massimo Morara
[DESCRIPTION]
Fixed printing of group information for tracing.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Now it can be controlled by an Boolean argument whether AFC
information between spaces is shared or not.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Now it can be controlled by an Boolean argument whether AFC
information between spaces is shared or not.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Now it can be controlled by an Boolean argument whether AFC
information between spaces is shared or not.

[ENTRY]
Module: float
What:   new
Rank:   minor
[DESCRIPTION]
Now it can be controlled by an Boolean argument whether AFC
information between spaces is shared or not.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks: Conrad Drescher
[DESCRIPTION]
The bounds propagator for abs is now bounds consistent.

[ENTRY]
Module: set
What:   new
Rank:   minor
Thanks: Conrad Drescher
[DESCRIPTION]
Added checks to avoid posting set relation propagators in case
their variables are in fact the same.

[ENTRY]
Module: search
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed a potential memory leak for restart-based search when the
root space was failed.

[ENTRY]
Module: kernel
What:   removed
Rank:   minor
[DESCRIPTION]
Choices do not need to implement a size function.

[ENTRY]
Module: flatzinc
What:   change
Rank:   major
Thanks: Maxim Shishmarev
[DESCRIPTION]
Added support for tracing search engines.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Andreas Schutt
[DESCRIPTION]
Fixed declarations of table_int and table_bool constraints.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
Shared handles and objects used to implement most shared data
structures in Gecode are thread safe now. In most cases they are
lock free.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The Boolean share argument during cloning is not any longer needed.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
During unsharing of AFC information also the propagator
identifiers were changed.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The unsharing of AFC information during cloning is not any longer
needed as it happens automatically when a new AFC object is
created.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Regions can be freed without destroying them. Consult MPG for
details.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
Regions are now created independently of a space and the policy
using several regions simultaneously has changed. Consult MPG for
details.

[ENTRY]
Module: search
What:   bug
Rank:   major
[DESCRIPTION]
Fixed a race condition in portfolio-based search.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
For Boolean variables, an initialized BoolCHB in branching was ignored.

[ENTRY]
Module: driver
What:   bug
Rank:   minor
[DESCRIPTION]
The -slice commandline option for sequential portfolios is not
ignored any longer.


[RELEASE]
Version: 5.1.0
Date: 2017-04-18
[DESCRIPTION]
This is a rather major release, fixing a number of bugs and
adding quite a number of new features. Some of the features
require changes to your models.

In more detail: extended tracing so that all propagator
executions and commit operations can be traced; renamed activity
to action to avoid confusion with activity in SAT (and fixed that
action information is also recorded during failure); added CHB
(conflict-history based branching) heuristic; optimized AFC; all
functions taken as arguments by Gecode are now based on
std::function-types; instead of branching with INT_VAR_* and
INT_VAL_* for Boolean variables, BOOL_VAR_* and BOOL_VAL_* must
be used. There are a number of additional changes, so you might
want to read the whole changelog.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Some FlatZinc constraints were not guarded with assertions, which could make
Gecode crash on incorrect models.

[ENTRY]
Module: kernel
What:   removed
Rank:   minor
[DESCRIPTION]
Choices do not need to implement a size() member function (unused
since years).

[ENTRY]
Module: float
What:   bug
Rank:   major
[DESCRIPTION]
The right-hand side of a linear constraint was a number rather
than a value (FloatNum rather than FloatVal) leading to rounding
errors.

[ENTRY]
Module: search
What:   bug
Rank:   major
[DESCRIPTION]
Fixed crashes in sequential and parallel portfolios using
parallel or restart-based best solution search engines as assets.

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
Trace recorders have been renamed to variable (or view) trace
recorders. New trace recorders have been added that can trace
all propagate and commit operations. See MPG for details.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Tracing now also records failure-events, see MPG for details.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Tracing now also records failure-events, see MPG for details.

[ENTRY]
Module: float
What:   new
Rank:   minor
[DESCRIPTION]
Tracing now also records failure-events, see MPG for details.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Tracing now also records failure-events, see MPG for details.

[ENTRY]
Module: int
What:   change
Rank:   minor
Thanks:	Conrad Drescher
[DESCRIPTION]
When posting a simple linear constraint (only two variables with
unit coefficients) with default integer propagation level, a
domain consistent propagator is posted.

[ENTRY]
Module: int
What:   removed
Rank:   minor
[DESCRIPTION]
The integer value selections INT_VAL_NEAR_MIN(),
INT_VAL_NEAR_MAX(), INT_VAL_NEAR_INC(), and INT_VAL_NEAR_DEC()
have been removed. It is much better to use LNS (large
neighbourhood search), see MPG for details.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Added reified versions of relation constraints between a set and
an integer variable.

[ENTRY]
Module: example
What:   change
Rank:   minor
[DESCRIPTION]
The Social golfers example now includes a model variant that uses
integer distinct for ensuring all player-pairs are distinct.

[ENTRY]
Module:	kernel
What:   change
Rank:   minor
[DESCRIPTION]
Replaced initialized() function by operator bool() for RND,
Action, AFC, CHB.

[ENTRY]
Module:	set
What:   new
Rank:   minor
[DESCRIPTION]
Added reified cardinality() constraint.

[ENTRY]
Module:	kernel
What:   change
Rank:   minor
[DESCRIPTION]
Disabled propagators can be disabled again (convenience).

[ENTRY]
Module:	other
What:   change
Rank:   major
[DESCRIPTION]
Gecode requires now at least the Microsoft Visual Studio 2013 compiler.

[ENTRY]
Module:	kernel
What:   new
Rank:   major
[DESCRIPTION]
Added support for CHB (conflict-history based branching)
heuristic for branching.

[ENTRY]
Module:	int
What:   new
Rank:   major
[DESCRIPTION]
Added support for CHB (conflict-history based branching)
heuristic for branching. See MPG for details.

[ENTRY]
Module:	set
What:   new
Rank:   major
[DESCRIPTION]
Added support for CHB (conflict-history based branching)
heuristic for branching. See MPG for details.

[ENTRY]
Module:	float
What:   new
Rank:   major
[DESCRIPTION]
Added support for CHB (conflict-history based branching)
heuristic for branching. See MPG for details.

[ENTRY]
Module:	kernel
What:   change
Rank:   minor
[DESCRIPTION]
Do not count number of weakly monotonic propagators, nobody used
it anyway.

[ENTRY]
Module:	kernel
What:   bug
Rank:   major
[DESCRIPTION]
Computing the afc for an assigned variable would crash.

[ENTRY]
Module:	kernel
What:   change
Rank:   major
[DESCRIPTION]
Reimplemented the infrastructure to record AFC, much simpler and
much faster.

[ENTRY]
Module:	kernel
What:   change
Rank:   major
[DESCRIPTION]
Renamed Activity to Action to avoid confusion with activity in SAT.

[ENTRY]
Module:	int
What:   change
Rank:   major
[DESCRIPTION]
Renamed Activity to Action to avoid confusion with activity in SAT.

[ENTRY]
Module:	set
What:   change
Rank:   major
[DESCRIPTION]
Renamed Activity to Action to avoid confusion with activity in SAT.

[ENTRY]
Module:	float
What:   change
Rank:   major
[DESCRIPTION]
Renamed Activity to Action to avoid confusion with activity in SAT.

[ENTRY]
Module:	kernel
What:   change
Rank:   major
[DESCRIPTION]
Variable implementations are not allowed to return a failed
modification event directly (such as in return ME_INT_FAILED;),
they need to call the function fail() instead (such as in return
fail(home);).

[ENTRY]
Module:	kernel
What:   change
Rank:   major
[DESCRIPTION]
Activity for branching was not counted when propagation lead to a
failed space, this is done now. The activity of a variable is now
by default initialized to 1. That makes activity actually
useful...

[ENTRY]
Module:	kernel
What:   change
Rank:   major
[DESCRIPTION]
Variable implementations do not need to define cancel()
functions, the kernel provides generic implementations (this only
matters for users implementing their own variables). Also cleaned
up some inlining mess which reduces object code size by around
10%.

[ENTRY]
Module:	kernel
What:   bug
Rank:   major
[DESCRIPTION]
In certain situations the AFC could be incremented twice (could
only have occurred for linear constraints with Boolean variables
and sequence constraints).

[ENTRY]
Module:	int
What:   change
Rank:   major
[DESCRIPTION]
All branching functions (merit, value, commit, tie-breaking
limit, filter, print) can now be of std::function type.

[ENTRY]
Module:	set
What:   change
Rank:   major
[DESCRIPTION]
All branching functions (merit, value, commit, tie-breaking
limit, filter, print) can now be of std::function type.

[ENTRY]
Module:	float
What:   change
Rank:   major
[DESCRIPTION]
All branching functions (merit, value, commit, tie-breaking
limit, filter, print) can now be of std::function type.

[ENTRY]
Module:	kernel
What:   change
Rank:   major
[DESCRIPTION]
All branching functions (merit, value, commit, tie-breaking
limit, filter, print) can now be of std::function type.

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
Branching on Boolean variables now requires to use BOOL_VAR_...()
and BOOL_VAL_...() functions instead of the INT_... variants.

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
Functions passed to wait() and when() can now be of std::function type.

[ENTRY]
Module: float
What:   change
Rank:   major
[DESCRIPTION]
Functions passed to wait() can now be of std::function type.

[ENTRY]
Module: set
What:   change
Rank:   major
[DESCRIPTION]
Functions passed to wait() can now be of std::function type.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Add assertions to regular constraint definition to avoid posting with
invalid arguments.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: David Hotham
[DESCRIPTION]
Fix parser to work with newer versions of GCC compiler.

[ENTRY]
Module: support
What:   new
Rank:   minor
[DESCRIPTION]
Added an abstraction RunJobs for executing several jobs in
parallel (not officially supported).

[ENTRY]
Module: float
What:   new
Rank:   minor
[DESCRIPTION]
Added if-then-else constraint (called ite) also for float
variables.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Added if-then-else constraint (called ite) also for set
variables.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added if-then-else constraint (called ite) also for Boolean
variables.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Relations between arrays now support also a mix between integer
(or Boolean) variable array and integer array.

[ENTRY]
Module: other
What:   change
Rank:   minor
[DESCRIPTION]
Enable C++11 standard on compilers that need an explicit switch. Can be
switched off using --disable-cpp11 during configuration.


[RELEASE]
Version: 5.0.0
Date: 2016-10-25
[DESCRIPTION]
This release adds a number of new features and fixes many bugs
(some rather serious), so it is recommended to switch as soon as
possible to this release. Some highlights are: re-added limited
discrepancy search (LDS); added sequential and parallel
portfolio-based search (PBS); added support for groups of
propagators and branchers; added extensive tracing functionality
based on groups; propagators can be disabled and re-enabled;
support for arbitrary memory allocators; changed the notion of
"integer consistency level" to the more expressive concept
"integer propagation level".

It is recommended to read the new Chapter in MPG on groups and
tracing.

As the interfaces has changed, please consult
\ref PageHowToChange_5 "How to Change to Gecode 5.0.0".

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed some idempotency problems in the n-ary union and weight propagators.

[ENTRY]
Module: float
What:   new
Rank:   minor
[DESCRIPTION]
Added relax() function for relaxed assignment of float variables
from a previous solution, see MPG for details.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Added relax() function for relaxed assignment of set variables
from a previous solution, see MPG for details.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added relax() function for relaxed assignment of integer and
Boolean variables from a previous solution, see MPG for details.

[ENTRY]
Module: driver
What:   new
Rank:   minor
[DESCRIPTION]
The probability for relaxing variables in LNS can be passed with
the -relax commandline option.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks:	Roberto Castañeda Lozano
[DESCRIPTION]
The domain consistent dom() constraint for integer ranges was
only bounds consistent...

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks: Matthias Balzer
[DESCRIPTION]
Export BoolExpr::Misc for linking.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
Thanks: Matthias Balzer
[DESCRIPTION]
Do not declare new and delete of ArgArrayBase as private to
support the use of placement new.

[ENTRY]
Module: driver
What:   new
Rank:   minor
[DESCRIPTION]
The discrepancy limit for Limited Discrepancy Search (LDS) can be
passed with the -d-l commandline option.

[ENTRY]
Module: search
What:   new
Rank:   major
[DESCRIPTION]
Limited Discrepancy Search (LDS) added. Please see MPG for
details.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   major
Thanks: Mats Carlsson
[DESCRIPTION]
Fix the FlatZinc parser for cases where variables were aliased to a fixed
variable.

[ENTRY]
Module: kernel
What:   bug
Rank:   major
Thanks: Matthias Balzer
[DESCRIPTION]
Fixed memory leak for regions (occurred for many large allocation
requests).

[ENTRY]
Module: float
What:   bug
Rank:   major
Thanks: Filip Konvicka
[DESCRIPTION]
Enable optimized rounding only if MSVC does not use SSE,
otherwise things really go wrong (necessary for MSVC 2015).

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Added additional propagation cost level record() which is
reserved for propagators that record information but do not
propagate.

[ENTRY]
Module: float
What:   new
Rank:   minor
[DESCRIPTION]
Added channeling constraint between float and Boolean variable.

[ENTRY]
Module: float
What:   bug
Rank:   minor
Thanks:	Matthias Balzer
[DESCRIPTION]
FloatValArgs erroneously inherited from PrimArgArray, now it
inherits from ArgArray.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks:	Matthias Balzer
[DESCRIPTION]
Fixed memory leak in constructor for Boolean element expression.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks:	Matthias Balzer
[DESCRIPTION]
Fixed special case handling for sqr and pow functions.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks:	Matthias Balzer
[DESCRIPTION]
Removed bogus declarations of comparison operators between
Boolean variables and float expressions.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Propagators and branchers now have a fixed identity available by
id() member functions.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
Thanks: Gilles Pesant
[DESCRIPTION]
Added an iterator SubscribedPropagators that iterates over the
subscribed propagators of views and variable implementations.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
Thanks: Mirko Rahn
[DESCRIPTION]
Do not use local classes as this would require C++-11.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fix n-ary lq/le propagator when used on arrays with variables occurring
multiply.

[ENTRY]
Module: kernel
What:   removed
Rank:   major
[DESCRIPTION]
Removed brancher handles, they are subsumed by brancher groups.

[ENTRY]
Module: other
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed many small quirks in propagator rewriting, where the
information on which propagator is rewritten was omitted.

[ENTRY]
Module: driver
What:   new
Rank:   minor
[DESCRIPTION]
Trace flags can be passed on the commandline.

[ENTRY]
Module: float
What:   new
Rank:   major
[DESCRIPTION]
Added support for tracing propagation, please see MPG for details.

[ENTRY]
Module: set
What:   new
Rank:   major
[DESCRIPTION]
Added support for tracing propagation, please see MPG for details.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Added support for tracing propagation, please see MPG for details.

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
Added support for tracing propagation, please see MPG for details.

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
All constraint post functions should now use the macro
GECODE_POST at their start: it will check for failure but also
will set group information useful for tracing.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Some Gecode macros made the assumption that they can only be used
inside the Gecode namespace. Fixed.

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
Added groups of branchers (class BrancherGroup) by which
groups of branchers can be controlled. See MPG for details.

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
Added groups of propagators (class PropagatorGroup) by which
groups of propagators can be controlled. See MPG for details.

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
Propagators can now be disabled and enabled (through
PropagatorGroups). See MPG for details.

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
All propagators must implement a virtual member function
reschedule() that can be used to reschedule a propagator according
to its subscriptions. See MPG for more details.

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
All variable implementation must implement an additional
reschedule() function that can be used to reschedule a propagator
according to its subscriptions. See MPG for more details.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The iterators over all propagators and branchers of a space are
not any longer accessible. Please use group iterators instead.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The member functions propagators() and branchers() of the class
Space have been removed as they can be expressed with groups.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Thanks:	Mirko Rahn
[DESCRIPTION]
Made copy constructor for search engines private to trigger
compiler error when trying to copy a search engine.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Thanks:	Mirko Rahn
[DESCRIPTION]
Fixed some linking issues for static linking.

[ENTRY]
Module: support
What:   new
Rank:   major
[DESCRIPTION]
Gecode supports now arbitrary memory allocators (the behavior can
be controlled by the commandline options -enable-allocator and
-disable-allocator). For more details, please see MPG.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
Thanks: Conrad Drescher
[DESCRIPTION]
Added destructor to NGL class to avoid warnings.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
Thanks: Matthias Balzer
[DESCRIPTION]
Fixed wrong type declaration in region_allocator::deallocate().

[ENTRY]
Module: float
What:   bug
Rank:   minor
Thanks: Conrad Drescher, Patrick Berg
[DESCRIPTION]
Fixed two infinite recursion bugs in related to use of hull().

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Add missing declaration for bool_clause_reif builtin.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Tommy Persson
[DESCRIPTION]
FlatZinc interpreter now does not try to post constraints if there was a
syntax error during parsing.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks: Roberto Castañeda Lozano, Matthias Balzer
[DESCRIPTION]
Fixed posting of Boolean element expressions and relations.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks: Joseph Scott
[DESCRIPTION]
Fixed printing of regular expressions.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added distinct-except-constant constraint.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added distinct with optional variables.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Add support for the alldifferent_except_0 constraint by rewriting to a
global cardinality constraint.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
The simple LNS using relax_and_reconstruct can now take an optional third
argument that is used as an initial solution.

[ENTRY]
Module: search
What:   change
Rank:   minor
[DESCRIPTION]
The restart meta search engine must be used with the
branch-and-bound engine for best solution search.

[ENTRY]
Module: search
What:   change
Rank:   minor
[DESCRIPTION]
For meta search engines, the order of template arguments has been
changed: the first is the script type, the second is the engine
type.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
All branchers of a space can be killed by
BrancherGroup::all.kill(home). This is the default for the master()
function when using portfolio search.

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
The clone() function takes an additional optional argument that defines
whether AFC information is shared among clones.

[ENTRY]
Module: driver
What:   new
Rank:   minor
[DESCRIPTION]
The number of assets to use for portfolio-based search can be
passed on the commandline as -assets.

[ENTRY]
Module: search
What:   new
Rank:   major
[DESCRIPTION]
Portfolio-based search has been added (both sequential and
parallel). Please see "Modeling and Programming with Gecode" for
details.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The master() and slave() configuration functions has been changed
as they are now also used for portfolio-based search. Please see
"Modeling and Programming with Gecode" for details.

[ENTRY]
Module: support
What:   new
Rank:   minor
[DESCRIPTION]
Classes can now inherit from HeapAllocated when using the Gecode
heap object for memory management.

[ENTRY]
Module: search
What:   bug
Rank:   minor
[DESCRIPTION]
The restart engine would not properly delete some data structures
when being deleted.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added some additional propagation to circuit and path
constraints, based on: Kathryn Glenn Francis, Peter Stuckey,
Explaining Circuit Propagation, Constraints (2014) 19:1-29.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
Thanks: Joseph Scott
[DESCRIPTION]
Missing = SUBSCRIBE annotations for modification events are
properly reported.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
The unary constraint now can also perform time-tabling propagation.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
The level of propagation of the cumulative constraint can now be
controlled via the integer propagation level argument. Please
consult Modeling and Programming with Gecode for details.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
The level of propagation of the unary constraint can now be
controlled via the integer propagation level argument. Please
consult Modeling and Programming with Gecode for details.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The selection for extensional table constraints whether to
optimize for speed or memory is now controlled by the integer
propagation level argument. The old argument of type
ExtensionalPropKind has been removed (the type has been removed
as well).

[ENTRY]
Module: driver
What:   change
Rank:   major
[DESCRIPTION]
The commandline option -icl (for integer consistency level) has
been replaced by -ipl (for integer propagation level). All new
levels can be specified by a comma separated list as argument to
-ipl.

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
The integer consistency level (IntConLevel) has been renamed to
integer propagation level (IntPropLevel). Additional levels for
speed, memory, basic, and advanced propagation have been added.
See Modeling and Programming with Gecode for details.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks:	Kish Shen
[DESCRIPTION]
The count constraint with INT_GR relation was broken (off-by-one error).

[ENTRY]
Module: example
What:   change
Rank:   minor
Thanks:	Ananja Muddukrishna
[DESCRIPTION]
The bin-packing model did not use a best-fit solution for the
upper bound, but only a first-fit.

[ENTRY]
Module: int
What:   performance
Rank:   minor
Thanks:	Kish Shen
[DESCRIPTION]
Some count constraints are now optimized in case its arguments are
assigned.

[ENTRY]
Module: other
What:   change
Rank:   minor
[DESCRIPTION]
Compiles with Visual Studio 2015.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks:	Kish Shen
[DESCRIPTION]
The binpacking constraint works even if all items are of size zero.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks:	Kish Shen
[DESCRIPTION]
Constrain bin variables even for zero-sized items in binpacking constraint.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Fix a bug in the parser when parsing float variable domains.

[ENTRY]
Module: int
What:   new
Rank:   minor
Thanks: Kish Shen
[DESCRIPTION]
Added variant of argmin and argmax with offset.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
Thanks: Pete Nightingale
[DESCRIPTION]
Make bounds propagation the default for global cardinality constraints
in FlatZinc.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Add support for generating the FlatZinc parser using bison version 3.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   major
Thanks: Andrea Rendl
[DESCRIPTION]
Fix branching on introduced variables, which could sometimes lead to
unassigned variables appearing in the output.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Jean-Noël Monette
[DESCRIPTION]
Improve error messages in FlatZinc for some type errors.


[RELEASE]
Version: 4.4.0
Date: 2015-03-20
[DESCRIPTION]
This release fixes some bugs and improves some search-related aspects.

Note that you will have to change all scripts that inherit from
the pre-defined script classes (Script, IntMinimizeScript,
IntMaximizeScript, FloatMinimizeScript, FloatMaximizeScript). The
change is easy: in your constructor you have to add a call to the
constructor of the pre-defined script class with the command line
options as argument. Just check any of the Gecode example for how
it is done.


[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
Thanks: Mark Manser
[DESCRIPTION]
An option -step now can pass an improvement step for
optimization of float problems.

[ENTRY]
Module: driver
What:   change
Rank:   major
[DESCRIPTION]
All scripts now must call the constructor of their base class
with an option argument.

Note that you will have to change your models by a call to the
constructor of the script class with an option argument!

[ENTRY]
Module: driver
What:   new
Rank:   minor
Thanks: Mark Manser
[DESCRIPTION]
An option -step now can pass an improvement step to scripts of
type FloatMinimizeScript and FloatMaximizeScript.

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
Thanks: Mark Manser
[DESCRIPTION]
The classes FloatMinimizeSpace and FloatMaximizeSpace can be
created with an improvement step for optimization.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Ahmed Kamal
[DESCRIPTION]
Added support for missing builtins array_float_element
(by decomposition), float_lin_lt and float_lin_lt_reif.

[ENTRY]
Module: search
What:   new
Rank:   minor
[DESCRIPTION]
Added functions to Stop class that can create common stop objects.

[ENTRY]
Module: search
What:   new
Rank:   minor
[DESCRIPTION]
Exposed class definitions for common cutoff generators.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Håkan Kjellerstrand
[DESCRIPTION]
LNS could fail when the search was restarted before finding the first solution.

[ENTRY]
Module: search
What:   bug
Rank:   major
Thanks: Håkan Kjellerstrand
[DESCRIPTION]
Fix memory leak in the DFS and BAB search engines that could make restart-based
search run out of memory very quickly.

[ENTRY]
Module: driver
What:   new
Rank:   minor
[DESCRIPTION]
Added option -seed for passing a seed to random number generators.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added quasigroup completion benchmarks.

[ENTRY]
Module: search
What:   performance
Rank:   minor
[DESCRIPTION]
Delay efforts for restarting until it is really needed after a
solution has been found.


[RELEASE]
Version: 4.3.3
Date: 2015-01-20
[DESCRIPTION]
This release adds support for LNS to FlatZinc, adds support for
MiniZinc 2, fixes a number of bugs and some new constraints.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
[DESCRIPTION]
Added support for arg_min and arg_max constraints.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added argmin and argmax constraints.

[ENTRY]
Module: search
What:   bug
Rank:   major
Thanks: Zichen Zhu
[DESCRIPTION]
Now no-goods are extracted properly in case a solution is found.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Add support for the MiniZinc 2 min/max builtins. The Gecode MiniZinc library
is now compatible with both MiniZinc 1.6 and 2.0.

[ENTRY]
Module: search
What:   change
Rank:   minor
[DESCRIPTION]
Change the slave function for meta search engines to return whether the search
in the slave is going to be complete. This is necessary for example in LNS,
where completing the search in the slave does not mean that the overall search
is finished.

[ENTRY]
Module: flatzinc
What:   new
Rank:   major
[DESCRIPTION]
Make a simple form of LNS accessible from FlatZinc. To use it, include
gecode.mzn and add the relax_and_reconstruct search annotation defined in
that file.

[ENTRY]
Module: set
What:   bug
Rank:   minor
Thanks: Farshid Hassani Bijarbooneh
[DESCRIPTION]
The channeling propagator between a SetVar and an array of BoolVars
propagated incorrectly when posted on a fixed SetVar.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
[DESCRIPTION]
Support dom_w_deg search annotation.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Search on objective function variable after all other variables (but
still before introduced variables).

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Mats Carlsson
[DESCRIPTION]
Fix special case detection for cumulatives constraint, could sometimes
incorrectly turn a cumulatives into a disjunctive constraint.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Björn Böttcher
[DESCRIPTION]
Fix behavior of -a command line option for satisfaction problems.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Chris Mears
[DESCRIPTION]
Fix default search annotation for float objectives.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Willem Van Onsem
[DESCRIPTION]
Install parser.tab.hh header.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
[DESCRIPTION]
Add support for gecode_schedule_cumulative_optional constraint.


[RELEASE]
Version: 4.3.2
Date: 2014-11-06
[DESCRIPTION]
Fixed major bug in and added extensive tests for the FlatZinc
interpreter. If you are using Gecode with FlatZinc you should
definitely upgrade!

[ENTRY]
Module: test
What:   new
Rank:   major
[DESCRIPTION]
Added long-overdue tests for the FlatZinc interpreter.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Thanks:	Alex Elliott
[DESCRIPTION]
Fix cmake build file to work better when building with Qt.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   major
Thanks: Jean-Noël Monette
[DESCRIPTION]
Fixed major bug that would cause the FlatZinc interpreter to crash
on most models.

[RELEASE]
Version: 4.3.1
Date: 2014-10-22
[DESCRIPTION]
This release fixes some minor issues and a major bug for the
FlatZinc interpreter. It considerably extends restart-based
search so that it supports LNS (Large Neighborhood Search).

[ENTRY]
Module: search
What:   change
Rank:   major
[DESCRIPTION]
The restart-based search engine has been made more powerful: the
master() and slave() configuration functions have been extended
and get more information about each restart and the engine always
maintains the last solution found. In particulae, the engine is
now powerful enough to support LNS (Large Neighborhood
Search). For details, please see MPG.

[ENTRY]
Module: search
What:   change
Rank:   minor
[DESCRIPTION]
The interface of cutoff generators has been extended in that it
now offers current value access (operator()()) as well as
increment (operator++()).

[ENTRY]
Module: search
What:   new
Rank:   minor
[DESCRIPTION]
Added a cutoff generator that merges the values of two cutoff generators.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Thanks:	Pierre Talbot
[DESCRIPTION]
Gecode can now be used together with boost without conflicts.

[ENTRY]
Module: other
What:   new
Rank:   minor
Thanks:	Petter Strandmark
[DESCRIPTION]
Added support for building examples with CMake.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks:	Léonard Benedetti
[DESCRIPTION]
Removed potentially undefined behavior for regular expressions.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   major
Thanks:	Mats Carlsson
[DESCRIPTION]
Fixed FlatZinc aliasing detection on array variables that
introduced incorrect aliases between variables.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks:	Frank Imeson
[DESCRIPTION]
Fixed parser for integer literals to generate error message when
integers are out of bounds.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks:	Peter Nightingale
[DESCRIPTION]
Fixed the FlatZinc interpreter to accept empty arrays as arguments in
annotations.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks:	Carleton Coffrin
[DESCRIPTION]
Fixed the behaviour for the -n and -a command line options for
optimisation models.


[RELEASE]
Version: 4.3.0
Date: 2014-08-28
[DESCRIPTION]
This release fixes a large number of both minor and major bugs,
has some improvements for FlatZinc, and adds multi-dimensional
bin-packing.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Thanks:	Victor Zverovich, Tony Kelman
[DESCRIPTION]
Various fixes for CMake:
 - Set the output directory for runtime target files (executables and DLLs) to bin/ subdirectory of the project's binary directory to avoid collisions when Gecode is used as a subproject.Improve suppression of warnings.
 - Add GECODE_USE_QT variable which specifies whether to use Qt. Qt is used if GECODE_USE_QT is TRUE or unset.
 - Prevent linker warnings on MSVC.
 - Use per-target instead of global include directories. This simplifies use of Gecode as a subproject because add_target_libraries(<target> <gecode-lib>) now sets the necessary include directories for <target> in addition to link dependencies.
 - Fix to fully link internal dependencies needed for creating DLLs: https://github.com/ampl/gecode/pull/2
 .

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
The --free command line option has been renamed to -f to comply with other
FlatZinc solvers.

[ENTRY]
Module: flatzinc
What:   performance
Rank:   minor
[DESCRIPTION]
The diffn constraint now posts additional implied cumulative constraints
to strengthen propagation.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Added unshare constraints to all constraints that need them. Without unsharing,
variables occurring multiply in the same FlatZinc arrays could lead to the
FlatZinc interpreter aborting with an error.

[ENTRY]
Module: flatzinc
What:   performance
Rank:   minor
[DESCRIPTION]
Treat equality constraints in FlatZinc as aliases instead of posting
propagators, and post simple domain constraints before more complex
propagators to help post the most efficient versions.

[ENTRY]
Module: example
What:   new
Rank:   minor
Thanks: Stefano Gualandi, Brian Kell, Willem-Jan Van Hoeve
[DESCRIPTION]
Added example for multi-dimensional bin-packing
constraint. Thanks to Brian and Willem-Jan for allowing us to use
their data set.

[ENTRY]
Module: int
What:   new
Rank:   major
Author: Stefano Gualandi
[DESCRIPTION]
Added multi-dimensional bin-packing constraint.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
Thanks: Kish Shen
[DESCRIPTION]
Allow 0.0 as decay value.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Thanks: Roland Stigge
[DESCRIPTION]
Added patch for PowerPC (downstream patch from Debian).

[ENTRY]
Module: other
What:   bug
Rank:   minor
Thanks: David Rijsman
[DESCRIPTION]
Added missing boost header files.

[ENTRY]
Module: test
What:   bug
Rank:   minor
Thanks: Victor Zverovich
[DESCRIPTION]
Removed uninitialized access.

[ENTRY]
Module: set
What:   bug
Rank:   minor
Thanks: Victor Zverovich
[DESCRIPTION]
Removed compiler warning.

[ENTRY]
Module: float
What:   bug
Rank:   minor
Thanks: Victor Zverovich
[DESCRIPTION]
Removed compiler warning.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Victor Zverovich
[DESCRIPTION]
Fixed FlatZinc interpreter to compile with clang in C++11 mode.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Bauke Conijn
[DESCRIPTION]
Re-enabled parts of not-first-not-last propagation for unary with
optional tasks.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Catch exceptions and print proper error message.

[ENTRY]
Module: minimodel
What:   bug
Rank:   major
[DESCRIPTION]
Fixed posting of set relations involving constants.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks:	Roberto Castañeda Lozano, Gabriel Hjort Blindell
[DESCRIPTION]
In extremely rare cases, the bounds-consistent distinct (and
hence all other distinct propagators as they use the
bounds-consistent one internally) propagator could suffer from
numerical overflow.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
Thanks:	Roberto Castañeda Lozano
[DESCRIPTION]
The function brancher did not return a handle.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks:	Duane Leslie
[DESCRIPTION]
No-good literals for greater-or-equal did not prune as much as they should.


[RELEASE]
Version: 4.2.1
Date: 2013-11-05
[DESCRIPTION]
This release fixes several major bugs and adds some minor
improvements.

[ENTRY]
Module: other
What:   change
Rank:   minor
[DESCRIPTION]
Compiles with MSVC 2013.

[ENTRY]
Module: search
What:   bug
Rank:   major
Thanks:	Roberto Castañeda Lozano
[DESCRIPTION]
Fix for restart-based search when the master does not have a branching.

[ENTRY]
Module: search
What:   bug
Rank:   major
Thanks:	Roberto Castañeda Lozano
[DESCRIPTION]
Restart-based search did not work when the cutoff limit did not
strictly increase.

[ENTRY]
Module: search
What:   new
Rank:   minor
Thanks:	Roberto Castañeda Lozano
[DESCRIPTION]
Added support for a repeat cutoff generator.

[ENTRY]
Module: int
What:   performance
Rank:   minor
Thanks: Anne Meyer
[DESCRIPTION]
Fix performance of domain consistent element for the case that the result
variable is assigned.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks: Bauke Conijn
[DESCRIPTION]
Fixed incorrect propagation in sortedness with permutation variables.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks: Duane Leslie
[DESCRIPTION]
Fixed cumulative constraint for 0-usage tasks.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks: Duane Leslie
[DESCRIPTION]
Fixed special case check for cumulative that would wrongly classify
some instances as disjunctive.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks: Kish Shen
[DESCRIPTION]
The nroot constraint now propagates correctly for negative
numbers when the exponent is odd.

[ENTRY]
Module: other
What:   bug
Rank:   minor
[DESCRIPTION]
Fix CMake to also build FlatZinc and Driver correctly.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in auxiliary variable branching.

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
Thanks: Philippe Kezirian
[DESCRIPTION]
The sum of IntArgs can now be computed similarly to the sum of
IntVarArgs.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
Thanks: Kish Shen
[DESCRIPTION]
Activity information can now be initialized with a branch merit function.

[ENTRY]
Module: int
What:   new
Rank:   minor
Thanks: Kish Shen
[DESCRIPTION]
Activity information can now be initialized with a branch merit function.

[ENTRY]
Module: set
What:   new
Rank:   minor
Thanks: Kish Shen
[DESCRIPTION]
Activity information can now be initialized with a branch merit function.

[ENTRY]
Module: float
What:   new
Rank:   minor
Thanks: Kish Shen
[DESCRIPTION]
Activity information can now be initialized with a branch merit function.



[RELEASE]
Version: 4.2.0
Date: 2013-07-19
[DESCRIPTION]
This release adds no-goods from restarts, removes memory
statistics (but Gecode can be configured for more accurate
statistics), and fixes a number of bugs.

[ENTRY]
Module: iter
What:   bug
Rank:   minor
Thanks: Farshid Hassani Bijarbooneh, Joseph Scott
[DESCRIPTION]
Fixed segfault in NaryUnion iterator.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Added configure switch --enable-peakheap that adds support for
memory statistics to the kernel. This comes with a runtime overhead,
but provides more accurate information than the previous search
engine based statistics.

[ENTRY]
Module: search
What:   removed
Rank:   major
[DESCRIPTION]
Removed memory statistics from the search engines. The reason is
that the figures were too inaccurate (memory for shared data
structure, caches, etc were not counted) and computing the
figures was complicated. This feature is replaced by a configure
switch that enables peak memory tracking based on operating system
information.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
Thanks: Kish Shen
[DESCRIPTION]
Low-level support for AFC is now public.

[ENTRY]
Module: search
What:   new
Rank:   minor
[DESCRIPTION]
Search options have an additional field nogoods_limit that
defines too which depth a search tree is inspected for no-goods.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The master() member function used during restart-based search now
takes an additional no-goods argument. The default master()
function posts no-goods (only effective when enabled in
Search::Options). See MPG for details.

[ENTRY]
Module: driver
What:   new
Rank:   minor
[DESCRIPTION]
When using restart-based search, the use of no-goods from
restarts can be switched on/off with the -nogoods command line
option and the depth limit for extraction of no-goods with the
-nogoods-limit command line option.

[ENTRY]
Module: search
What:   new
Rank:   major
[DESCRIPTION]
Added support for no-goods from restarts, see Modeling and
Programming with Gecode for details.

Note that also entails that the statistics will report different
a different peak depth than in previous releases of Gecode when
using no-goods.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
[DESCRIPTION]
Added support for value_precede_int and value_precede_set constraints.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   major
Thanks: Chris Mears
[DESCRIPTION]
Fixed a memory leak in FlatZincSpace and a few more in the FlatZinc
parser.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Chris Mears
[DESCRIPTION]
Fixed a bug in implicit search heuristic that could lead to a
segmentation fault when minimizing an array element.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Thanks:	Victor Zverovich
[DESCRIPTION]
Fixes link error for CMake with MSVC.


[RELEASE]
Version: 4.1.0
Date: 2013-07-01
[DESCRIPTION]
This release adds a really useful feature and the required
infrastructure to Gist (it now can show information on the
alternatives in a search tree), has some new features, and fixes
quite a number of bugs (some of which are quite serious, in
particular for: LDSB, restart-based search, and FlatZinc).

[ENTRY]
Module: driver
What:   bug
Rank:   minor
Thanks: Vincent Barichard
[DESCRIPTION]
Fixed a race condition when using parallel search.

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed SET_VAR_ACTIVITY_SIZE_MIN/MAX, which used to compute
size/activity instead of activity/size.

[ENTRY]
Module: kernel
What:   performance
Rank:   minor
[DESCRIPTION]
Implement the AFC search heuristic using FastMutex, which greatly
improves parallel search performance on Mac OS X when using AFC.

[ENTRY]
Module: support
What:   new
Rank:   minor
[DESCRIPTION]
Added FastMutex class that is implemented using spin locks on
some platforms.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks:	Victor Zverovich
[DESCRIPTION]
Fixed INT_VALUES_MAX() branching (INT_VALUES_MIN() was used instead).

[ENTRY]
Module: float
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed FLOAT_VAR_ACTIVITY_SIZE_MIN/MAX, which used to compute
size/activity instead of activity/size.

[ENTRY]
Module: example
What:   new
Rank:   minor
Thanks:	Stefano Gualandi
[DESCRIPTION]
Added LDSB-based symmetry breaking to graph coloring example.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks:	Peter Nightingale
[DESCRIPTION]
Fixed printing of float variables to be compatible with MiniZinc output.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks:	Peter Nightingale
[DESCRIPTION]
Fixed a segmentation fault when using FlatZinc with float variables
that have initializers.

[ENTRY]
Module: set
What:   bug
Rank:   major
Thanks:	Stefano Gualandi
[DESCRIPTION]
Fixed crash due to combination of LDSB and Activity.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks:	Stefano Gualandi
[DESCRIPTION]
Fixed crash due to combination of LDSB and Activity.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
The internal representation of integer variable domains could leak
memory to the space.

[ENTRY]
Module: flatzinc
What:   new
Rank:   major
[DESCRIPTION]
The FlatZinc interpreter now supports float variables as objective
functions.

[ENTRY]
Module: gist
What:   new
Rank:   major
[DESCRIPTION]
Gist now can show information on the alternatives in a search tree,
using the new menu options "Label branches" and "Label path".

[ENTRY]
Module: float
What:   bug
Rank:   minor
[DESCRIPTION]
Random value selection for float branchings was not declared with
the right types.

[ENTRY]
Module: set
What:   new
Rank:   major
[DESCRIPTION]
Set branchings now take an optional argument for a
user-defined print function. See MPG for details.

[ENTRY]
Module: float
What:   new
Rank:   major
[DESCRIPTION]
Float branchings now take an optional argument for a
user-defined print function. See MPG for details.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Integer and Boolean branchings now take an optional argument for a
user-defined print function. See MPG for details.

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
Branchers now support a print() member function.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
[DESCRIPTION]
Added {int,bool,set,float}_default_search annotations. These can be used
on solve items to declare the default search strategy for the respective
variable types.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks:	Roberto Castañeda Lozano
[DESCRIPTION]
Boolean expressions could lead to a segfault when initialized
with default constructor.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Both AFC and Activity can be changed by a set() function.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added if-then-else constraint (called ite) for integer variables.

[ENTRY]
Module: driver
What:   new
Rank:   minor
Thanks:	Pascal Francq
[DESCRIPTION]
Added classes FloatMinimizeScript and FloatMaximizeScript for
cost-based optimization with a float cost variable.

[ENTRY]
Module: driver
What:   change
Rank:   minor
[DESCRIPTION]
Added classes IntMinimizeScript and IntMaximizeScript for
cost-based optimization with an integer cost variable. While the
classes MinimizeScript and MaximizeSpcript are still available,
there use is deprecated and a later release might remove them.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Added classes IntMinimizeSpace and IntMaximizeSpace for
cost-based optimization with an integer cost variable. While the
classes MinimizeSpace and MaximizeSpace are still available,
there use is deprecated and a later release might remove them.

[ENTRY]
Module: float
What:   new
Rank:   minor
Thanks:	Pascal Francq
[DESCRIPTION]
Added classes FloatMinimizeSpace and FloatMaximizeSpace for
cost-based optimization with a float cost variable.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed the random search strategies to all use the same random number
generator instead of different generators all initialised with the same
seed (and therefore all producing the same sequences).

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
Thanks: Tias Guns
[DESCRIPTION]
Added int2float constraint which was missing in the FlatZinc
interpreter.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: David Rijsman
[DESCRIPTION]
Fixed binpacking crash when the b and s arrays are empty.

[ENTRY]
Module: other
What:   change
Rank:   minor
Thanks: Cliff Yapp
[DESCRIPTION]
CMake build system tweaked for out-of-source-dir building.

[ENTRY]
Module: float
What:   bug
Rank:   minor
Thanks: Duong Khanh Chuong
[DESCRIPTION]
Fixed missing propagation in reified rel-constraints.

[ENTRY]
Module: search
What:   bug
Rank:   major
Thanks: Chris Mears, Roberto Castañeda Lozano
[DESCRIPTION]
Fixed a bug in restart-based search, which would crash if the
problem is failed at the root or only had a single solution
during best-solution search.

[RELEASE]
Version: 4.0.0
Date: 2013-03-14
[DESCRIPTION]
This release adds a multitude of new features, fixes many bugs,
and offers a number of performance improvements. There are too
many major improvements to even summarize them here all, so here
are just some highlights: LDSB as automatic symmetry breaking
during search; restart-based search; complete redesign and
reimplementation of branching enhancing the expressiveness
massively (AFC with decay, activity, user-defined variable and
value selection, tie-break control, better randomization, ...);
half-reification; addition of floating point constraints.

It is recommended to read the new Chapter in MPG on branching as
the changes are substantial and require you to change your
programs, see also the full list of changes below.

As the interfaces has changed, please consult \ref
PageHowToChange_4 "How to Change to Gecode 4.0.0".

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Renamed the FlatZinc executable to fzn-gecode, to better distinguish
it when installed alongside other FlatZinc implementations.

[ENTRY]
Module: int
What:   new
Rank:   major
Author: Christopher Mears
[DESCRIPTION]
Gecode now supports Lightweight Dynamic Symmetry Breaking (LDSB),
see MPG for details.

[ENTRY]
Module: set
What:   new
Rank:   major
Author: Christopher Mears
[DESCRIPTION]
Gecode now supports Lightweight Dynamic Symmetry Breaking (LDSB),
see MPG for details.

[ENTRY]
Module: int
What:   new
Rank:   major
Thanks: Manuel Loth
[DESCRIPTION]
Added value selection strategies for branching
INT_VAL_NEAR_MIN(), INT_VAL_NEAR_MAX(), INT_VAL_NEAR_INC(), and
INT_VAL_NEAR_DEC(). They can take a previous assignment to the
variables to branch on and try to choose values which are near
(see MPG for details).

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added domain constraint that constrains a variable (or an array)
according to the domain of another variable.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Added domain constraint that constrains a variable (or an array)
according to the domain of another variable.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Added domain constraints for arrays of set variables.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The default constrain() function for best-solution search now
does by default nothing (it used to throw an exception).

[ENTRY]
Module: driver
What:   new
Rank:   major
[DESCRIPTION]
Added commandline options to control restart-based search, see
MPG for details.

[ENTRY]
Module: search
What:   new
Rank:   major
[DESCRIPTION]
Added support for restart-based search, see MPG for details.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
[DESCRIPTION]
Added support for more search annotations (defined in gecode.mzn), and for
the restart and decay command line options.

[ENTRY]
Module: other
What:   new
Rank:   minor
Thanks:	Victor Zverovich
[DESCRIPTION]
Added CMake build script for Gecode (CMakeLists.txt).

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added variants of dom that copy the domain from one variable to
another.

[ENTRY]
Module: driver
What:   new
Rank:   minor
[DESCRIPTION]
Decay values can now be passed on the command line using the
switch -decay.

[ENTRY]
Module: search
What:   change
Rank:   major
[DESCRIPTION]
Variable selection for branching used the quotient of size
divided by degree, accumulated failure count, or activity. They
now use the inverse. That is, for example, it is not any longer
INT_VAR_SIZE_DEGREE_MIN() but INT_VAR_DEGREE_SIZE_MAX() (that is,
largest degree divided by size).
[MORE]
That looks like an annoying change but is in fact essential: the
strategies using accumulated failure count and activity now could
have run into division by zero issues. And just changing the
implementation is not good enough because the values of these
measures can now be exposed during tie-breaking.

[ENTRY]
Module: other
What:   new
Rank:   major
[DESCRIPTION]
Variable selection using AFC now supports decay. Read more in MPG.

[ENTRY]
Module: int
What:   performance
Rank:   major
[DESCRIPTION]
Arithmetic, linear, and cumulative constraints now resort to
internal operations using "long long int" rather than
"double". This improves performance but also extends the range
over integer coefficients that can be handled by linear
constraints.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
The mzn-gecode shell script now passes arguments correctly to the
FlatZinc interpreter.

[ENTRY]
Module: other
What:   change
Rank:   minor
[DESCRIPTION]
Compiles with MSVC 2012.

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
Updated to compile with Qt version 5.0 (still works with Qt >= 4.3 as well).

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks:	Roberto Castañeda Lozano
[DESCRIPTION]
Fixed precede constraint with less than two values.

[ENTRY]
Module: set
What:   bug
Rank:   minor
Thanks:	Roberto Castañeda Lozano
[DESCRIPTION]
Fixed precede constraint with less than two values.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
The nooverlap constraint now allows sharing of unassigned
variables in its argument arrays.

[ENTRY]
Module: set
What:   new
Rank:   major
[DESCRIPTION]
Added half-reification for reified constraints (see Modeling and
Programming with Gecode for details).

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Added half-reification for reified constraints (see Modeling and
Programming with Gecode for details).

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Simon Ekvy
[DESCRIPTION]
Removed spurious debug output for among constraint.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks: Lin Yong
[DESCRIPTION]
Fixed a bug where bounds consistent distinct reported subsumption
instead of failure in certain cases.

[ENTRY]
Module: support
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed a concurrency problem that caused an exception to be thrown at
the end of a multi-threaded search on some platforms.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The coefficients for linear constraints are now divided by
their greatest common divisor. That means that some equations
can be handled now that previously threw an OutOfLimits exception,
and some equations can be handled with the more efficient integer
precision propagators that previously required double precision.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The entire infrastructure for variable-value branchers has been
reimplemented from scratch. The new design makes a much better
compromise between code size, efficiency, and expressiveness:
the efficiency is about the same (for examples with no
propagation and just branching one can note a slowdown of 2-4%)
while code size shrinks drastically (the overall code size for
integer variables shrinks by 20%) and the architecture is much
more expressive (in particular, it supports tie-break limits, see
MPG).

[ENTRY]
Module: int
What:   change
Rank:   minor
Thanks:	Roberto Castañeda Lozano
[DESCRIPTION]
Generalized definition of no-overlap propagators for better reuse.

[ENTRY]
Module: iter
What:   documentation
Rank:   minor
[DESCRIPTION]
Clarified for several iterators that when using the assignment
operator both iterators must be allocated from the very same
region.

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
The interface for branching on integer and Boolean variables has
changed considerably (supporting user-defined variable and value
selection, tie-break limit functions, handlers to created
branchers, and more). In order to change, you have to add () to
all variants of INT_VAR, INT_VAL, and INT_ASSIGN. For example,
INT_VAR_SIZE_MIN becomes the function call INT_VAR_SIZE_MIN() and
INT_VAL_MIN_MIN becomes the function call INT_VAL_MIN_MIN(). Some
of these functions expect additional arguments and can take also
optional arguments (this replaces the VarBranchOptions and
ValBranchOptions). Please read the new "Branching" chapter
in MPG.

[ENTRY]
Module: set
What:   change
Rank:   major
[DESCRIPTION]
The interface for branching on integer and Boolean variables has
changed considerably (supporting user-defined variable and value
selection, tie-break limit functions, handlers to created
branchers, and more). In order to change, you have to add () to
all variants of SET_VAR, SET_VAL, and SET_ASSIGN. For example,
SET_VAR_SIZE_MIN becomes the function call SET_VAR_SIZE_MIN() and
SET_VAL_MIN_INC becomes the function call SET_VAL_MIN_INC(). Some
of these functions expect additional arguments and can take also
optional arguments (this replaces the VarBranchOptions and
ValBranchOptions). Please read the new "Branching" chapter in
MPG.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
The random seeds for variable and value branching options can now
be initialized from a hardware random number generator (see MPG
for details).

[ENTRY]
Module: search
What:   change
Rank:   major
[DESCRIPTION]
The restart best solution search engine has been removed (it is
subsumed by the new restart-based meta search engine RBS).


[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
Added pow and nroot expressions for integer variables.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Added pow and nroot constraints.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed potential rounding issues in sqr and sqrt constraints.

[ENTRY]
Module: search
What:   performance
Rank:   minor
[DESCRIPTION]
The search engines now do not allocate memory on the search stack for
the rightmost branch of each node. This means that the search tree
depth is now computed differently. It now represents the actual peak
depth required at any one time, taking into account that rightmost
branches reuse the stack entry of their parents.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks: Manuel Baclet
[DESCRIPTION]
Fixed copying of tuple sets in extensional constraints and IntSets in
sequence constraints (could lead to crashes when using parallel search).

[ENTRY]
Module: support
What:   bug
Rank:   minor
Thanks: Max Ostrowski
[DESCRIPTION]
Fixed a bug in the allocation of very large bitsets.

[ENTRY]
Module: kernel
What:   performance
Rank:   major
Thanks: Zandra Norman
[DESCRIPTION]
Fixed a bug in the main memory allocation routine: now heap block
sizes are decreased dynamically as they should be. Also changed
the memory configuration parameters as explained in: Zandra
Norman, Memory Management for Gecode.  KTH Royal Institute of
Technology, Sweden, Bachelor thesis, TRITA-ICT-EX-2012:143, 2012.

[ENTRY]
Module: driver
What:   new
Rank:   minor
Thanks: Andrea Pretto
[DESCRIPTION]
Added options -file-sol and -file-stat for writing solutions and
statistics to arbitrary files and streams.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Jean-Noël Monette
[DESCRIPTION]
Exported registry and helper functions so that users can add
constraint handlers to the FlatZinc interpreter.

[ENTRY]
Module: gist
What:   new
Rank:   minor
[DESCRIPTION]
Added option to invoke move cursors during the automatic search.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Respect IntConLevel argument for reified linear constraints with a
single integer variable.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Jean-Noël Monette
[DESCRIPTION]
Added missing propagation for nary min/max constraint.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
[DESCRIPTION]
Added native support for lex_less_bool and lex_lesseq_bool.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Peter Nightingale
[DESCRIPTION]
Make extensional constraints work with empty tuple sets.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Peter Nightingale
[DESCRIPTION]
Fix count (global cardinality constraint) for multiple occurrences
of the same value in the cover array.

[ENTRY]
Module: flatzinc
What:   new
Rank:   major
[DESCRIPTION]
Gecode/FlatZinc now supports float constraints and variables.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
All ArgArrays now accept STL vectors and input iterators for construction.

[ENTRY]
Module: flatzinc
What:   new
Rank:   major
Thanks: Gabriel Hjort Blindell
[DESCRIPTION]
The FlatZinc interpreter now supports comparing of nodes in Gist.

[ENTRY]
Module: flatzinc
What:   change
Rank:   major
[DESCRIPTION]
The FlatZinc interpreter no longer performs a complete search on variables
annotated as var_is_introduced, but tries to extend a solution on the model
variables to a solution that includes the introduced variables. Each solution
on the model variables is therefore only reported once.

[ENTRY]
Module:	float
What:	new
Rank:	major
Author:	Vincent Barichard
[DESCRIPTION]
Added support for float variables.

[ENTRY]
Module:	int
What:	new
Rank:	minor
Thanks: Kathrin Dannmann, Roberto Castañeda Lozano
[DESCRIPTION]
The binpacking constraint now also accepts items of size zero.

[ENTRY]
Module:	int
What:	new
Rank:	major
[DESCRIPTION]
Added activity-based branching strategies for integer and Boolean
variables: INT_VAR_ACTIVITY_MIN, INT_VAR_ACTIVITY_MAX,
INT_VAR_ACTIVITY_SIZE_MIN, INT_VAR_ACTIVITY_SIZE_MAX. For
details, see "Modeling and Programming with Gecode".

[ENTRY]
Module:	set
What:	new
Rank:	major
[DESCRIPTION]
Added activity-based branching strategies for set variables:
SET_VAR_ACTIVITY_MIN, SET_VAR_ACTIVITY_MAX,
SET_VAR_ACTIVITY_SIZE_MIN, SET_VAR_ACTIVITY_SIZE_MAX. For
details, see "Modeling and Programming with Gecode".

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
The kernel now can record the activity of variables. The activity
of a variable is defined as how often the domain of a variable
has been pruned during search.  For details, see "Modeling and
Programming with Gecode".

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
New example: Colored matrix without monochromatic rectangles.

[ENTRY]
Module: driver
What:   new
Rank:   minor
Thanks: Josef Eisl
[DESCRIPTION]
The command line -print-last configures whether only the last
solution found is printed.

[ENTRY]
Module: driver
What:   change
Rank:   minor
[DESCRIPTION]
Boolean options (BoolOption) can now be given a false or true argument
and hence are in-line with all other option types.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Throw exception when the user-defined copy constructor of a class
that inherits from Space does not call the Space copy constructor.

[ENTRY]
Module: set
What:   new
Rank:   major
Author: Denys Duchier
[DESCRIPTION]
Added channeling constraint between arrays of set variables.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
[DESCRIPTION]
Added native support for the inverse_set constraint.

[ENTRY]
Module: minimodel
What:   change
Rank:   minor
[DESCRIPTION]
Made implementations of MiniModel expressions private, so that the
MiniModel headers do not have to include propagator headers like
gecode/int/linear.hh any longer.


[RELEASE]
Version: 3.7.3
Date: 2012-03-23
[DESCRIPTION]
This release fixes some small bugs in the FlatZinc interpreter and library.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Marco Correia
[DESCRIPTION]
Fixed "largest" variable selection strategy for set variables.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Removed the print command line option. Instead, for optimization problems,
using -a will print all solutions, while not using -a will only print the
last one. This is consistent with the G12 FlatZinc command line interface.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Thibaut Feydy
[DESCRIPTION]
Fixed the parser for set literals.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
[DESCRIPTION]
Added mzn-gecode scripts for conveniently solving MiniZinc models
using the Gecode FlatZinc interpreter.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Integer variables with empty domains result in unsatisfiable models
instead of an error message.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Support 0-length array declarations.

[RELEASE]
Version: 3.7.2
Date: 2012-02-27
[DESCRIPTION]
This release fixes several small bugs.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Export RTTI symbols for the FlatZinc AST so that it can be used
by client code.

[ENTRY]
Module: other
What:   new
Rank:   minor
Thanks: Adam Russell
[DESCRIPTION]
Gecode now compiles on NetBSD.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Throw exception of type OutOfLimits instead of Exception when
numerical arguments to sequence constraint are out of range.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Joseph Scott
[DESCRIPTION]
Added missing pruning to cumulative edge finding propagator.

[ENTRY]
Module: driver
What:   bug
Rank:   minor
Thanks: Serge Le Huitouze
[DESCRIPTION]
Fixed rounding for printing the runtime (for example,
1:60:56.157 could be printed...).

[ENTRY]
Module: set
What:   bug
Rank:   major
Thanks: Denys Duchier
[DESCRIPTION]
The element constraint with SOT_UNION and IntSetArgs reported
subsumption too early, resulting in incorrect propagation.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
[DESCRIPTION]
The BoolExpr default constructor did not properly initialize
its members, causing crashes.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Posting a reified dom constraint on IntVars with an assigned control
variable does not create propagators any more, but updates the
domain immediately.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Nicholas Tung
[DESCRIPTION]
Do not crash when encountering undefined identifier as constraint argument.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Kish Shen
[DESCRIPTION]
Fixed sorted constraint to accept zero-length arrays.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Kish Shen
[DESCRIPTION]
Added some missing propagation when posting a channel constraint
between an array of Boolean variables and an integer variable.

[ENTRY]
Module: other
What:   new
Rank:   minor
Thanks: Denys Duchier
[DESCRIPTION]
Added a macro GECODE_VERSION_NUMBER that is defined as
x*1000000+y*100+z for Gecode version x.y.z.

[ENTRY]
Module: driver
What:   bug
Rank:   minor
Thanks: Jan Kelbel
[DESCRIPTION]
Fixed time output for times with zero minutes but nonzero hours.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Added Archive operators for floats and doubles.

[RELEASE]
Version: 3.7.1
Date: 2011-10-10
[DESCRIPTION]
This release fixes several bugs, upgrades to MiniZinc version
1.4, and features some minor improvements.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The semantics of n-ary Boolean implication has been changed (to
the more conventional reading): rel(home, BOT_IMP, x, y) where x is
an array of Boolean variable now assumes implication to be right
associative. See MPG for explanation.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added efficient propagators for n-ary Boolean xor and equivalence
(as they are now primitive in MiniZinc).

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
The FlatZinc interpreter is now compatible with the G12 MiniZinc
distribution 1.4. This adds support for var and par identifiers that
begin with underscores, the array_bool_xor primitive, as well as the
command line option -r for specifying a random seed.

[ENTRY]
Module: int
What:   new
Rank:   minor
Thanks: Kish Shen
[DESCRIPTION]
Domain consistency for simple counting constraints can be
switched off.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   major
Thanks: Håkan Kjellerstrand
[DESCRIPTION]
Fixed linear inequations over integer variables that are channeled
from Boolean variables.

[ENTRY]
Module: support
What:   bug
Rank:   minor
[DESCRIPTION]
Compile again if threads are disabled.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Domain consistent distinct runs 10-20% faster.

[ENTRY]
Module: set
What:   bug
Rank:   major
[DESCRIPTION]
Do not use SharedArray<IntSet> in the set element constraints,
because it does not properly update the IntSet during copying.
This could cause memory corruption.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
Fixed bugs in the computation of the required precision
(int or double) for linear propagation, and in division
operations of scale views. These could cause an incorrect
treatment of overflow in linear constraints.

[ENTRY]
Module: search
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed a bug that crashed the single-thread branch-and-bound
search engine when initialized with a failed space.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed a crash that occurred when double-clicking an unexplored
node while move inspectors were active.


[RELEASE]
Version: 3.7.0
Date: 2011-08-31
[DESCRIPTION]
This release adds and improves quite a number of constraints
(total lexicographic order for set variables, membership
constraints for integer variables, counting constraints for
integer variables using integer sets, range, roots, set element
constraints for integer variables, number of values for integer
variables). All of these constraints (and some more) are now also
available in FlatZinc. Additionally, some fixes and improvements.

This release is an important milestone as %Gecode now provides
native implementations for all important constraints available
in MiniZinc/FlatZinc.

The documentation of constraints in "Modeling and Programming
with Gecode" now refers to the Global Constraint Catalog (for
those constraints that are listed in the catalog).

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Call solution inspectors also when exploring manually.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Flush output to Gist console, so that output that is not ended by a
newline is not lost.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   major
[DESCRIPTION]
Added missing primitives set_le, set_lt, set_ge, and set_gt.

[ENTRY]
Module: set
What:   new
Rank:   major
[DESCRIPTION]
Added set relations SRT_LQ, SRT_LE, SRT_GQ, SRT_GR for total
(lexicographic) order.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Thanks: Gustavo Gutierrez
[DESCRIPTION]
Install generated variable implementation headers instead of the shipped
versions (fixes a problem when building Gecode in a separate directory).

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Added normal and reified membership constraints for integer and
Boolean variables.

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
Added a convenience function values that restricts the set of values
taken by an array of integer variables to a fixed set, using the nvalues
constraint. The channel constraints between IntVarArgs and a SetVar now
also use nvalues to increase propagation.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Added some additional propagation for the count constraints (now,
for example, count(home, x, y, IRT_GQ, 1) also constrains y to
only take values supported by x).

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
The count constraints now also support comparison to integer sets
in addition to integers and integer variables (which then implements among
from the GCCAT).

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
Added range and roots, which decompose into set element constraints.

[ENTRY]
Module: flatzinc
What:   new
Rank:   major
[DESCRIPTION]
Added native support for among, nvalues, int_set_channel,
member_bool, member_int, sum_pred, and the range and roots
constraints.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Added set element constraints with singleton integer variables
as arguments.

[ENTRY]
Module: set
What:   bug
Rank:   minor
Thanks: Johannes Inführ
[DESCRIPTION]
Fixed a memory leak in the set weights constraint, and use
IntSharedArray instead of IntArgs as parameters for weights.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
Thanks: Max Ostrowski
[DESCRIPTION]
Array slices can now be created from empty arrays.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Added nvalues constraint.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added Dominating %Queens puzzle.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
View arrays can now also use region-allocated memory.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
The estimation of bounds on linear terms did not handle overflow
correctly.

[ENTRY]
Module: iter
What:   change
Rank:   minor
[DESCRIPTION]
Cached iterators such as n-ary union and intersection, minus, and
cache (of course) are not any longer template classes but take
template constructors and member functions. N-ary union and
intersection iterators can now also be initialized incrementally
with iterators of different types.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
The set_in and set_in_reif constraints now work for constant sets
even when %Gecode is compiled without support for set variables.


[RELEASE]
Version: 3.6.0
Date: 2011-07-15
[DESCRIPTION]
This release adds new constraints (value precedence constraints
for integer and set variables, no-overlap constraints for
rectangles, constraints for Hamiltonian paths), improves and
cleans up a number of existing constraints (scheduling,
channeling, relation, bin-packing, lexicographic relations), and
adds new functionality (support for externalization of choices
for distributed search, support for incremental propagation).

Some models might have to be changed as the graph and scheduling
modules have been incorporated into the integer module (removing
the respective include directives is sufficient).

On top, there are many small fixes, in particular for FlatZinc.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The cumulatives constraint now does not post the s+p=e constraints,
harmonizing its semantics with the cumulative and unary constraints.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
The cumulative constraints now support an IntVar as the capacity
argument.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added Schur's Lemma puzzle.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Optimized channeling propagator between an array of Boolean
variables and an integer variables.

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
Changed semantics of rel(home, x, IRT_NQ), enforces that not all
variables in x are equal. See "Modeling and Programming with
Gecode" for details.

[ENTRY]
Module: flatzinc
What:   new
Rank:   major
[DESCRIPTION]
Added native support for the precedence constraint.

[ENTRY]
Module: set
What:   new
Rank:	major
Author:	Christopher Mears
[DESCRIPTION]
Added value precedence constraint.

[ENTRY]
Module: int
What:   new
Rank:	major
Author:	Christopher Mears
[DESCRIPTION]
Added value precedence constraint.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
The disequality constraint between variable arrays has an efficient
propagator now.

[ENTRY]
Module: int
What:   performance
Rank:   major
[DESCRIPTION]
The ordering constraints rel(home, x, IRT_LE) (also for IRT_LQ,
IRT_GR, IRT_GQ) now have an optimal implementation (single
incremental propagator).

[ENTRY]
Module: driver
What:   bug
Rank:   minor
Thanks: Jan Kelbel
[DESCRIPTION]
Fixed a small memory leak in the driver (stop objects were not deleted).

[ENTRY]
Module: int
What:   performance
Rank:   major
[DESCRIPTION]
Increased performance of bin-packing propagator by 40 to 300
percent by using staging.

[ENTRY]
Module: flatzinc
What:   new
Rank:   major
[DESCRIPTION]
Added native support for the no-overlap constraint (called diffn in
MiniZinc/FlatZinc).

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Added no-overlap constraint that enforces that rectangles do not
overlap (also known as diffn). See "Modeling and Programming with
Gecode" for details.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Added constraints for Hamiltonian paths (called
path). See "Modeling and Programming with Gecode" for details.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
Thanks: Håkan Kjellerstrand
[DESCRIPTION]
Support indomain_middle and indomain_interval search annotation by
replacing them with indomain_median and indomain_split, respectively.

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
Zoom-to-fit can now be selected during search.

[ENTRY]
Module: graph
What:   change
Rank:   major
[DESCRIPTION]
The graph module has been removed and its constraints have been
added to the integer module.

[ENTRY]
Module: scheduling
What:   change
Rank:   major
[DESCRIPTION]
The scheduling module has been removed and its constraints have been
added to the integer module.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed element and sequence propagators, which were only
correct by accident (incorrect use of GECODE_ME_CHECK instead of
GECODE_ES_CHECK).

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed sequence, partition, and union propagators, which were only
correct by accident (incorrect use of GECODE_ME_CHECK instead of
GECODE_ES_CHECK).

[ENTRY]
Module: scheduling
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed scheduling code for mandatory flexible tasks, which was only
correct by accident (incorrect use of GECODE_ME_CHECK instead of
GECODE_ES_CHECK).

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
[DESCRIPTION]
Added native support for link_set_to_booleans,
global_cardinality_low_up_closed, and decreasing_bool.

[ENTRY]
Module: int
What:   new
Rank:   minor
Thanks: Kish Shen
[DESCRIPTION]
Generalized lexicographic constraint to arrays of different sizes.

[ENTRY]
Module: search
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed memory leak when passing a failed space to a search engine with cloning
option set to false.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Moved RangeList class, which is a list of ranges implemented as a FreeList,
from the set module into the kernel. Also added corresponding
Iter::Ranges::RangeList iterator.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Added a CachedView that can cache the domain between propagator invocations
and provides an efficient test whether a view has changed since the previous
invocation as well as an iterator over the removed domain values. This makes
it easier to implement incremental propagation algorithms that need exact
delta information.

[ENTRY]
Module: set
What:   new
Rank:   major
[DESCRIPTION]
Added a CachedView that can cache the domain between propagator invocations
and provides an efficient test whether a view has changed since the previous
invocation as well as an iterator over the removed domain values. This makes
it easier to implement incremental propagation algorithms that need exact
delta information.

[ENTRY]
Module: set
What:   performance
Rank:   minor
[DESCRIPTION]
Use new cached views for a more efficient implementation of the channel constraint between IntVarArgs and SetVarArgs.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Changed keyboard shortcuts in Gist so that they work on all platforms: "Inspect"
is now Ctrl+number of inspector, for "Inspect before fixpoint" press Alt in
addition (on Mac OS, use the Command key instead of Ctrl).

[ENTRY]
Module: other
What:   bug
Rank:   minor
Thanks: Martin Mann
[DESCRIPTION]
Fixed Makefile, now installation works when FlatZinc library is disabled.

[ENTRY]
Module: other
What:   new
Rank:   minor
Thanks: Ruben Zilibowitz
[DESCRIPTION]
Added configure option --enable-small-codesize that results in
slightly less efficient but more compact code being generated for
non-debug builds.

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
The constructors for set variable arrays and argument arrays threw incorrect
VariableEmptyDomain exceptions.

[ENTRY]
Module: graph
What:   new
Rank:   minor
[DESCRIPTION]
Added circuit constraints with offsets.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
The channel constraints between two integer arrays are now more
memory efficient when offsets are used.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
Choices can now be written into an externalized form (called an Archive),
and reconstructed from it. This is necessary for serializing paths in
a distributed search engine.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Adapted the MiniZinc declarations and the command line options for
Gecode/FlatZinc to MiniZinc 1.3. The fz binary now works with the
minizinc driver script.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Håkan Kjellerstrand
[DESCRIPTION]
Re-enabled the global cardinality constraint in the FlatZinc interpreter.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Håkan Kjellerstrand
[DESCRIPTION]
Fixed the MiniZinc definition for the circuit constraints to work with
arbitrarily indexed arrays.

[ENTRY]
Module:	gist
What:	change
Rank:	minor
Thanks: Alin Gherman
[DESCRIPTION]
Compiles under MSVC 2005 SP1 again.

[ENTRY]
Module:	set
What:	new
Rank:	minor
Thanks: Marco Correia
[DESCRIPTION]
Added channel aliases for set union of an array of integer variables,
and renamed channel to channelSorted.

[ENTRY]
Module:	set
What:	documentation
Rank:	minor
Thanks: Marco Correia
[DESCRIPTION]
Fixed documentation for set channeling constraint.


[RELEASE]
Version: 3.5.0
Date: 2011-02-01
[DESCRIPTION]
This release fixes serious bugs in parallel search, FlatZinc,
fixes some DLL issues on Windows, adds support for FreeBSD, and
adds STL-style iterators for arrays.

[ENTRY]
Module:	search
What:	bug
Rank:	major
Thanks: Denys Duchier, Chris Mears
[DESCRIPTION]
Fixed a serious bug in parallel search (took over a year to
isolate the bug).

[ENTRY]
Module:	other
What:	new
Rank:	minor
Thanks: Peter Penchev
[DESCRIPTION]
Gecode now compiles on FreeBSD.

[ENTRY]
Module:	kernel
What:	new
Rank:	major
Author: Gregory Crosswhite
[DESCRIPTION]
Added STL compatible iteration support for arrays (variable
arrays, argument arrays, view arrays, and shared arrays).

[ENTRY]
Module:	minimodel
What:	bug
Rank:	minor
Thanks: Alexander Kleff
[DESCRIPTION]
Do not inline construction of linear, Boolean, and set
expressions to avoid cross-DLL allocation/deallocation issues on
Windows.

[ENTRY]
Module:	other
What:	new
Rank:	major
[DESCRIPTION]
Embed resource information into Gecode DLLs and EXEs on Windows.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   major
Thanks: Roberto Castañeda Lozano
[DESCRIPTION]
Fixed incorrect posting of linear constraints with variable arrays
of size one.

[ENTRY]
Module:	other
What:	change
Rank:	minor
[DESCRIPTION]
Embed manifest into Gecode DLLs on Windows.

[ENTRY]
Module: flatzinc
What: 	change
Rank: 	major
[DESCRIPTION]
Fixed the definitions of global_cardinality to work with MiniZinc 1.2 and
newer, and added corresponding definitions of global_cardinality_closed and
global_cardinality_low_up_closed.


[RELEASE]
Version: 3.4.2
Date: 2010-10-09
[DESCRIPTION]
This release removes LDS from Gecode as it is patented in the US.

[ENTRY]
Module: search
What:   removed
Rank:   minor
[DESCRIPTION]
Removed limited discrepancy search (LDS) as it is patented in the US.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
[DESCRIPTION]
Added support for binpacking constraint.

[RELEASE]
Version: 3.4.1
Date: 2010-10-08
[DESCRIPTION]
This release adds a new global constraint for binpacking (with
extended example) and filter functions for branchers. The
reference documentation has been cleaned up. In particular,
information on how to obtain, install, and link Gecode has been
expanded and moved to "Modeling and Programming with Gecode"
(Section 2.6). Additionally, the release fixes some bugs and
contains some performance improvements.

[ENTRY]
Module: example
What:   new
Rank:   major
[DESCRIPTION]
Added a binpacking model using the binpacking constraint and CDBF
(complete decreasing best fit) search.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Added a binpacking constraint and propagator.

[ENTRY]
Module: driver
What:   new
Rank:   minor
[DESCRIPTION]
Added a class InstanceOptions that takes one additional string argument.

[ENTRY]
Module: flatzinc
What:   new
Rank:   minor
[DESCRIPTION]
Added support for global_cardinality_low_up.

[ENTRY]
Module: other
What:   documentation
Rank:   minor
[DESCRIPTION]
Removed obsolete Glossary in reference documentation.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Gustavo A. Gómez Farhat
[DESCRIPTION]
Do not inline functions with variable arguments.

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
Only center node on double-click if it was undetermined (otherwise
inspecting several nodes becomes slightly annoying).

[ENTRY]
Module: minimodel
What:   change
Rank:   minor
[DESCRIPTION]
Added element expression for BoolVarArgs.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed memory allocation for non-linear expressions and made the
LinExpr constructor explicit for non-linear expressions (previously
the automatic cast from integers to LinExpr was sometimes ambiguous).

[ENTRY]
Module: scheduling
What:   bug
Rank:   major
Thanks: Roberto Castañeda Lozano
[DESCRIPTION]
Fixed initialization for unary and cumulative edge-finding (just
worked accidentally).

[ENTRY]
Module: kernel
What:   change
Rank:   major
Thanks: Felix Brandt
[DESCRIPTION]
Branching now honors filter functions, where variables are
considered for branching only if the filter functions returns
true (see "Modeling and Programming with Gecode" for details).

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Variable implementation views are now parametric with respect to
variables but not variable implementations (see "Modeling and
Programming with Gecode" for details).

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Renamed the template class for variables defined by a variable
implementation from Var to VarImpVar and re-added a class Var as
base class for any variable type.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Kish Shen
[DESCRIPTION]
The reified dom constraint failed instead of setting the BoolVar to 0 when the
minimum argument given was greater than the maximum.

[ENTRY]
Module: int
What:   performance
Rank:   minor
Thanks: Kish Shen
[DESCRIPTION]
Fixed sortedness constraint by replacing an algorithm that is linear in the
width of the union of all domains with an algorithm that is quadratic in the
number of variables. The previous algorithm crashed for domains with large
values due to excessive memory use.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Using ICL_DOM for binary linear equations with unit coefficients (such as x =
y+3) is now implemented using the much more efficient binary equality
propagator instead of the linear equation propagator (which has worst case
exponential runtime).

[ENTRY]
Module: gist
What:   performance
Rank:   minor
[DESCRIPTION]
Saved some memory for each node in Gist (one pointer per node, two integers
per inner node, and some additional memory on 64 bit platforms due to optimizing
alignment), and speeded up deallocation of the tree (e.g. when resetting or
closing Gist).

[ENTRY]
Module: iter
What: 	performance
Rank:	minor
[DESCRIPTION]
Reimplemented n-ary union, minus, and cache iterators for much
better efficiency.

[ENTRY]
Module: flatzinc
What:   performance
Rank:   minor
[DESCRIPTION]
The FlatZinc parser now uses hash maps instead of STL maps, which
significantly increases parsing performance for larger files.
Furthermore, a single symbol table is used, also increasing
performance and allowing to report duplicate symbol errors,
which were previously ignored.


[RELEASE]
Version: 3.4.0
Date: 2010-07-26
[DESCRIPTION]
This release includes: considerably improved support for posting
expressions and relations (also including set and full arithmetic
expressions); other improvements for modeling (array
initialization and element addition to arrays); state-of-the-art
unary and cumulative scheduling propagators (including optional
and flexible tasks); major cleanups of the variable and view
infrastructure (now also documented in MPG); cleanups of the
examples; several other fixes and performance improvements.

This release is the first to be accompanied by a complete version
of "Modeling and Programming in Gecode" which has been extended
by many new case studies and parts on programming search engines
and variables.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Boolean relations were incorrect on assigned arguments.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Posting a propagator in a failed space could make the space
non-failed again.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Added LocalObject and LocalHandle classes that can be used for
space-allocated objects that are shared within a space, for
example among several propagators or propagators and branchers.

[ENTRY]
Module: other
What:   change
Rank:   major
[DESCRIPTION]
Completely cleaned up variables and views, drastically saving code.

[ENTRY]
Module: other
What:   removed
Rank:   minor
[DESCRIPTION]
Variables do not have init functions any longer as they are not
needed, see MPG for discussion.

[ENTRY]
Module: scheduling
What:   new
Rank:   major
[DESCRIPTION]
Added scheduling constraints for tasks with flexible duration
(for both unary and cumulative resources), and made all scheduling
propagators deal correctly with zero length tasks.

[ENTRY]
Module: scheduling
What:   new
Rank:   major
[DESCRIPTION]
Added propagators for cumulative scheduling.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks: Håkan Kjellerstrand
[DESCRIPTION]
Fixed a bug in minimodel, which could crash when using zero
coefficients.

[ENTRY]
Module: driver
What:   change
Rank:   minor
[DESCRIPTION]
The driver now catches SIGINT (i.e., pressing Ctrl-C) and stops
the search properly, printing statistics up to the point where
it stopped.

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
If an inspector throws an exception, an error message is
printed indicating which inspector caused the problem.
Previously, Gist would crash with a Qt error that was difficult
to trace.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed garbage collection of variables that are not printed. The
bug lead to variables being mixed up in the output.

[ENTRY]
Module: example
What:   removed
Rank:   minor
[DESCRIPTION]
Removed stress tests, the real examples are much more stressful,
actually!

[ENTRY]
Module: minimodel
What:   change
Rank:   minor
[DESCRIPTION]
The Matrix class now supports const operations and has an output
operator.

[ENTRY]
Module: minimodel
What:   change
Rank:   major
[DESCRIPTION]
Linear expressions can now contain non-linear parts, such as
multiplications or divisions, or set expressions such as
cardinality.

[ENTRY]
Module: minimodel
What:   change
Rank:   major
[DESCRIPTION]
The minimodel post functions have been split into two functions, rel
and expr. While rel posts a constraint, expr returns a new variable
constrained to the given expression. This change makes it possible to
get rid of the reification operator (~) as well as the tt and ff
functions, which were previously needed to distinguish between
relations and expressions. Boolean equivalence and implication can
now be expressed using operators (==,<<,>>).

[ENTRY]
Module: minimodel
What:   new
Rank:   major
[DESCRIPTION]
The minimodel library now provides convenient post functions
for set constraints.

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed the include and exclude tell operations of set variables so
that they work with empty ranges.

[ENTRY]
Module: example
What:   change
Rank:   minor
[DESCRIPTION]
The Nonogram example now uses AFC as the default branching and
includes some more instances.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
New custom branching for the BACP example using a custom value selection.

[ENTRY]
Module: other
What:   change
Rank:   minor
[DESCRIPTION]
The configure script now checks for qmake-qt4 and moc-qt4, which are used on
some Linux systems to distinguish between Qt3 and Qt4.

[ENTRY]
Module: driver
What: 	change
Rank:	minor
[DESCRIPTION]
Running a script in time mode stops all iterations and samples
immediately if a single run reaches a limit (eases benchmarks
with timeouts).

[ENTRY]
Module: int
What: 	performance
Rank:	minor
[DESCRIPTION]
Optimized element propagator, expect a speed up of around 35-50%
in most cases.

[ENTRY]
Module: minimodel
What: 	performance
Rank:	minor
[DESCRIPTION]
Posting linear expressions performs more aggressive optimizations
for assigned variables.

[ENTRY]
Module: minimodel
What: 	performance
Rank:	minor
[DESCRIPTION]
Arithmetic modeling functions now try to avoid creating new
variables and posting propagators for common cases.

[ENTRY]
Module: set
What: 	change
Rank:	minor
[DESCRIPTION]
The argument arrays now have constructors that create new variables.

[ENTRY]
Module: int
What: 	change
Rank:	minor
[DESCRIPTION]
The argument arrays now have constructors that create new variables.

[ENTRY]
Module: int
What: 	change
Rank:	minor
[DESCRIPTION]
IntArgs with simple sequences of values can now be created using the
IntArgs::create static member function.

[ENTRY]
Module: other
What: 	change
Rank:	minor
[DESCRIPTION]
The build system now supports Visual C++ 2010.

[ENTRY]
Module: minimodel
What: 	change
Rank:	minor
[DESCRIPTION]
Array slices can now be empty.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The support for dynamically resizing variable arrays has been
removed (it was buggy and inefficient). Instead, all argument
arrays now support adding elements using operator<<. In addition,
all arrays now support concatenation using operator+ and slicing,
and variable arrays, view arrays, and variable argument arrays
include a test whether all variables are assigned.

[ENTRY]
Module: example
What:   change
Rank:   minor
[DESCRIPTION]
Take advantage of the better modeling support for the BIBD, Golomb
ruler, Kakuro, Black Hole, and Warehouse examples (nothing but dusting off
examples that have been around for ages).

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
You can now construct IntArgs from an STL vector, an IntSharedArray,
or using simple comprehensions.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in Gist where signals were sent across threads, which
makes Qt crash in certain situations on some platforms.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
Thanks: David Zaremby
[DESCRIPTION]
Fixed bug in interactive search where every move in the tree required
recomputation.


[RELEASE]
Version: 3.3.1
Date: 2010-04-09
[DESCRIPTION]
This release adds many new features to Gist, fixes two major bugs
in extensional constraints, and has some more cleanups to comply
with the first release of the "Modeling and Programming with
Gecode" document. And, as always some small fixes and cleanups.

[ENTRY]
Module: other
What:   documentation
Rank:   minor
[DESCRIPTION]
Removed many small documentation quirks.

[ENTRY]
Module: flatzinc
What:   performance
Rank:   minor
[DESCRIPTION]
Variables that do not have output annotations are now garbage
collected during copying.

[ENTRY]
Module: flatzinc
What:   performance
Rank:   minor
[DESCRIPTION]
When using sums of Boolean variables using bool2int in MiniZinc,
the FlatZinc interpreter now posts the more efficient propagators
that work directly on the Boolean variables.

[ENTRY]
Module: scheduling
What:   bug
Rank:   minor
[DESCRIPTION]
The unary scheduling propagator with optional tasks missed some
propagation sometimes.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
Fixed extensional constraint with finite automata for very
unlikely (but apparently possible) border case.

[ENTRY]
Module: gist
What:   new
Rank:   major
[DESCRIPTION]
In addition to inspectors, you can now also register comparators, which can be
used to compare two nodes in the tree. In combination with the option to
compare before computing a fixpoint of the second node, this lets you see what
exactly was modified by a branching.

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed channeling between set and integer variables which did not propagate
enough.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
The extensional constraints with tuple sets could cause crashes
when used with parallel search.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Missing export declarations prevented embedding Gist as a widget. There is
now example code for embedding Gist in the directory
gecode/gist/standalone-example.

[ENTRY]
Module: gist
What:   new
Rank:   major
[DESCRIPTION]
Gist can now stop exploration after all alternatives of a certain branching
are exhausted. This feature can be turned on by posting a special branching
using the Gist::stopBranch post function. Gist will then stop whenever that
special branching becomes active.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in VarArray::resize function that occurred when shrinking
variable arrays.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The (unused and unusable) CopiedHandle have been removed.

[ENTRY]
Module: scheduling
What:   change
Rank:   minor
[DESCRIPTION]
Tasks in unary scheduling constraints may now have processing times of 0.

[ENTRY]
Module: gist
What:   new
Rank:   minor
[DESCRIPTION]
Added inspection of nodes before fixpoint computation.

[ENTRY]
Module: set
What:   removed
Rank:   minor
[DESCRIPTION]
Removed Set::IntSetPropagator and Set::IntSetRePropagator because they are
subsumed by the MixBinaryPropagator patterns.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed a bug where sometimes clicking on a node would select a different node.

[ENTRY]
Module: gist
What:   performance
Rank:   major
[DESCRIPTION]
Scrolling and zooming have been reimplemented. The new implementation is more
efficient and works around problems that occurred with large trees on some
platforms. Zooming is now more intuitive, keeping the current center
centered. You can now also zoom by pressing shift while using the mouse wheel.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added Gist inspectors for the Knights and Queens examples.

[ENTRY]
Module: driver
What:   new
Rank:   minor
[DESCRIPTION]
You can now register Gist inspectors in the driver options.

[ENTRY]
Module: gist
What:   new
Rank:   minor
[DESCRIPTION]
Nodes can now be bookmarked.

[ENTRY]
Module: gist
What:   new
Rank:   minor
[DESCRIPTION]
Added inspectors that react whenever a node is selected.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Comply with MiniZinc 1.1. String literals are not allowed any longer
except in annotations, the solver outputs UNKNOWN and UNSATISFIABLE
instead of just ==========, and the global constraints all_equal,
decreasing_int, and decreasing_bool are supported.



[RELEASE]
Version: 3.3.0
Date: 2010-03-15
[DESCRIPTION]
This release provides some fixes, some performance improvements
for domain propagators, and quite some clean ups how propagators
and advisors report their status to the kernel. Many of these
clean ups are essential to make it easier to program propagators
and branchers with Gecode.

[ENTRY]
Module: other
What:   bug
Rank:   minor
[DESCRIPTION]
Configure now prepend options to the CXXFLAGS and CFLAGS variables
instead of appending them. That way, defining the variables when
invoking configure overrides the choices configure makes (e.g.
overriding the default -O3 with -O2).

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Patterns for reified propagators have been moved to the
Gecode::Int namespace.

[ENTRY]
Module: set
What:   change
Rank:   minor
[DESCRIPTION]
Patterns for set propagators have been moved to the
Gecode::Set namespace.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
ViewValBrancher with random value selection did not produce a
random sequence of values.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Advisors now can force its propagator to be rescheduled,
including recomputation of its cost used for scheduling
(normally, a propagator is only rescheduled if its modification
event delta changes). An advisor can signal forceful rescheduling
by returning ES_NOFIX_FORCE or returning the return value of
ES_NOFIX_FORCE_DISPOSE. Read the forthcoming "Modeling and
Programming with Gecode" for details.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The failure macros for posting GECODE_ES_FAIL and GECODE_ME_FAIL
now only accept a single argument and assume that "home" actually
refers to the home space.  Read the forthcoming "Modeling and
Programming with Gecode" for details.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The functions ES_FIX_PARTIAL, ES_NOFIX_PARTIAL, ES_FIX_DISPOSE,
and ES_NOFIX_DISPOSE are now member of Space. Read the
forthcoming "Modeling and Programming with Gecode" for details.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The function ES_SUBSUMED now is a member of Space and accepts a
propagator as its single argument. The variant with a size as the
second argument is available as ES_SUBSUMED_DISPOSED but use is
highly discouraged. Read the forthcoming "Modeling and
Programming with Gecode" for details.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The functions ES_SUBSUMED_FIX and ES_SUBSUMED_NOFIX for advisors
have been renamed to ES_FIX_DISPOSE and ES_NOFIX_DISPOSE. Read
the forthcoming "Modeling and Programming with Gecode" for
details.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
The FlatZinc interpreter can now be extended by plugins that implement
custom search strategies. The plugins are implemented as dynamically loaded
libraries using the Qt plugin mechanism. An example can be found in the
directory gecode/flatzinc/exampleplugin.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
The index of the variable used for optimization is now available in the
FlatZincSpace class.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
Added command line option -print, which controls whether all solutions are
printed or only the last one that is found, and -search, to choose between
branch-and-bound and restart optimization.

[ENTRY]
Module: flatzinc
What:   change
Rank:   minor
[DESCRIPTION]
The FlatZinc library can now parse a FlatZinc model into any subclass of
FlatZincSpace, so that custom extensions can be built. Annotations on the
solve item can now be accessed from the returned FlatZincSpace, so that
additional search strategies can be implemented.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
The FlatZinc interpreter ignored the -c-d and -a-d command line
switches when used with Gist.

[ENTRY]
Module: minimodel
What:   removed
Rank:   minor
[DESCRIPTION]
Removed special cases for posting linear and Boolean expressions
consisting of a single variable only (was highly ambiguous).

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
Linear expressions can freely mix integer and Boolean variables
and support construction from variable arrays via a sum function.

[ENTRY]
Module: support
What:   performance
Rank:   major
[DESCRIPTION]
Changed to single, really efficient bitset implementation used
allover the system.

[ENTRY]
Module: int
What:   performance
Rank:   major
[DESCRIPTION]
Considerably improved performance and memory consumption of the
DFA-based extensional constraint (regular).

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Integer sets (IntSet) now have a in member function for testing
whether an integer is included.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Avoid inter-thread call to QWidget::update, which apparently causes a slight
memory leak (and warning messages on stderr) on Mac OS.



[RELEASE]
Version: 3.2.2
Date: 2009-11-30
[DESCRIPTION]
This release adds the sequence constraint (contributed by David
Rijsman, Quintiq) and has as always some small additions and
fixes.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Alberto Delgado
[DESCRIPTION]
The global cardinality (count) constraint now accepts unsorted
arrays of values.  It previously propagated incorrectly if the
array was not sorted.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in the ICL_VAL propagator for global cardinality.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
Thanks: Håkan Kjellerstrand
[DESCRIPTION]
Support search annotations with constants in the variable arrays.

[ENTRY]
Module: search
What:   bug
Rank:   minor
[DESCRIPTION]
The memory reported could be sometimes too low (the previous fix
for 3.2.0 did not fix it for branch and bound search).

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
Thanks:	Gustavo Gutierrez
[DESCRIPTION]
Added missing assignment operator for space-based allocators for
STL data structures.

[ENTRY]
Module: iter
What:   change
Rank:   minor
[DESCRIPTION]
Renamed test for subset or disjointness of range iterators to "compare".

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
The set_in and set_in_reif constraints were buggy when used with Boolean
variables (which are usually not generated by mzn2fzn so that the issue
probably does not occur in practice).

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Subscription to constant views did not honor the flag to avoid
processing (did not occur in practice).

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Subscription to constant views did not honor the flag to avoid
processing.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added car sequencing example (problem 1 in CSPLib). Uses the new
sequence-constraint.

[ENTRY]
Module: int
What:   new
Rank:   major
Author:	David Rijsman
[DESCRIPTION]
Added sequence constraint.

[ENTRY]
Module: driver
What:   new
Rank:   minor
[DESCRIPTION]
Report if search engine has been stopped.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   minor
[DESCRIPTION]
The global_cardinality constraint was not completely compatible with
the MiniZinc semantics. It would constrain values not mentioned in the
array to have zero occurrences, while in MiniZinc they are unrestricted.

[ENTRY]
Module: flatzinc
What:   bug
Rank:   major
Thanks: Håkan Kjellerstrand
[DESCRIPTION]
Element constraints in reified positions produced an error in the mzn2fzn
translation.


[RELEASE]
Version: 3.2.1
Date: 2009-11-04
[DESCRIPTION]
This release fixes one serious bug in the element constraint for
matrices; adds branchings using accumulated failure counts (also
known as weighted degree); provides some optimizations (mostly
for element constraints and for regular expressions with millions
of nodes); adds two cute models (word-square and crossword); and
a little this and that as always.

[ENTRY]
Module: minimodel
What:   performance
Rank:   minor
Thanks:	Håkan Kjellerstrand
[DESCRIPTION]
Conversion of a regular expression to a DFA would crash on
regular expressions with several million nodes (due to running
out of call stack space).

[ENTRY]
Module: set
What:   change
Rank:   minor
[DESCRIPTION]
Split rel-op.cpp and rel-op-const.cpp into several compilation units, to avoid
excessive memory and time usage of the gcc compiler.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Element constraints for integer arrays now accept shared integer
arrays (IntSharedArray). By this, the very same array can be
shared among several element constraints. Models require no
change, as IntArgs are automatically coerced to
IntSharedArrays. See "Modeling with Gecode" for more
explanation.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The semantics of division and modulo has changed to match the C standard. This
means that the operations round towards zero, and that the result of the
modulo has the same sign as its first argument.

[ENTRY]
Module: example
What:   bug
Rank:   minor
Thanks: Jan Wolter
[DESCRIPTION]
The Nonogram example no longer crashes on empty lines.

[ENTRY]
Module:	int
What:	performance
Rank:	minor
[DESCRIPTION]
Optimized element for matrices (in special cases, the propagator
is up to six times as efficient as before).

[ENTRY]
Module:	flatzinc
What:	bug
Rank:	minor
[DESCRIPTION]
Fixed statistics output (number of solutions was sometimes wrong).

[ENTRY]
Module:	int
What:	bug
Rank:	major
[DESCRIPTION]
Fixed segfault in matrix element constraint.

[ENTRY]
Module:	example
What:	new
Rank:	minor
Author:	Håkan Kjellerstrand
[DESCRIPTION]
Added word square puzzle.

[ENTRY]
Module:	example
What:	new
Rank:	minor
Thanks:	Peter Van Beek
[DESCRIPTION]
Added crossword puzzle (thanks to Peter Van Beek for providing
access to some crossword grids).

[ENTRY]
Module:	int
What:	new
Rank:	minor
[DESCRIPTION]
Added INT_VAL_RANGES_MIN (and INT_VAL_RANGES_MAX) as value
selection for branching: it tries the values from the smallest
(largest) range first, if the variable's domain has several
ranges, otherwise it splits the domain.

[ENTRY]
Module:	int
What:	bug
Rank:	minor
[DESCRIPTION]
Added missing dispose function for linear disequality of Boolean
variables (the only problem was that with a proper dispose
function more memory can be reused when the propagator becomes
subsumed, so really a tiny quirk).

[ENTRY]
Module:	int
What:	new
Rank:	major
[DESCRIPTION]
Added AFC-based branching strategies for integer and Boolean
variables: INT_VAR_AFC_MIN, INT_VAR_AFC_MAX,
INT_VAR_SIZE_AFC_MIN, INT_VAR_SIZE_AFC_MAX. For details, see
"Modeling with Gecode".

[ENTRY]
Module:	set
What:	new
Rank:	major
[DESCRIPTION]
Added AFC-based branching strategies for set variables:
SET_VAR_AFC_MIN, SET_VAR_AFC_MAX, SET_VAR_SIZE_AFC_MIN,
SET_VAR_SIZE_AFC_MAX. For details, see "Modeling with Gecode".

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
Propagators and variables now maintain an accumulated failure
count (AFC).
[MORE]
The AFC of a propagator counts how often has the propagator
failed during the entire search, and the AFC of a variable is its
degree plus the sum of the AFCs of all propagators depending on
the variable. While it looks straightforward, this required a
major extension of the Gecode kernel to deal with global
information accessed concurrently from several threads during
search. The AFC is also known as "weighted degree".

[ENTRY]
Module: example
What:   change
Rank:   minor
[DESCRIPTION]
Sudoku and GraphColor now uses smallest size over accumulated failure
count (AFC) as the default heuristic.

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
For branching, SET_VAR_DEGREE_MAX would select the variable with
smallest rather than largest degree.

[ENTRY]
Module: other
What:   change
Rank:   major
[DESCRIPTION]
Now posting of propagators and branchers take an object of class
Home (rather than just a space) that can carry additional
information relevant for posting (for example, groups and
accumulated failure information). Models do not need to be
changed in any way!
[MORE]
While models require no change, propagator rewriting does (it
will work but some information might be lost). Instead of writing
something like
GECODE_REWRITE(*this,SomeProp::post(home,...));
where *this is the propagator to be rewritten, you should now
write
GECODE_REWRITE(*this,SomeProp::post(home(*this),...));
By this, the new propagator will inherit information from *this
(in particular the accumulated failure count).


[RELEASE]
Version: 3.2.0
Date: 2009-10-05
[DESCRIPTION]
This release has some important bug fixes (in particular for
global cardinality aka count), the documentation has been
improved (worked around some issues with generation by doxygen),
integrates the FlatZinc interpreter into the Gecode source tree,
provides propagators for disjunctive scheduling (experimental),
and lots of small changes and fixes. For more consistent names,
branchings are branchers now and branching descriptions are
choices (this you might have to adapt to).


[ENTRY]
Module: scheduling
What:   new
Rank:   major
[DESCRIPTION]
Added propagators for disjunctive scheduling (unary resource
scheduling). This is still experimental as the propagators are
not yet optimized and branching and modelling support is not yet
available.

[ENTRY]
Module: search
What:   bug
Rank:   minor
[DESCRIPTION]
The memory reported could be sometimes too low (that could only
happen when an advisor allocates memory which they do only now).

[ENTRY]
Module: other
What:   documentation
Rank:   major
[DESCRIPTION]
Cleaned up the generated reference documentation, and introduced a number
of workarounds for issues in doxygen. In particular, the documentation for
linear constraints over Boolean variables and for the thread abstractions
is now generated properly.

[ENTRY]
Module: flatzinc
What:   new
Rank:   major
[DESCRIPTION]
The Gecode interpreter for the FlatZinc language is now part of the main
Gecode source tree.

[ENTRY]
Module: int
What:   performance
Rank:   minor
Thanks:	George Katsirelos, Nina Narodytska
[DESCRIPTION]
Extensional propagators using DFAs or REGs (aka regular) use a
more compact state representation but create their state more
eagerly. That can improve performance considerably (twice as fast) at a slight
increase in memory.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Gist now places clones also on the leftmost branch during search.

[ENTRY]
Module: other
What:   documentation
Rank:   minor
Thanks: Vivian De Smedt
[DESCRIPTION]
Mention that also grep is needed for building Gecode.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Jan Kelbel
[DESCRIPTION]
Slightly improved strength of the division propagator.

[ENTRY]
Module: example
What:   bug
Rank:   minor
Thanks: Geoffrey Chu
[DESCRIPTION]
Fixed wrong symmetry breaking for TSP.

[ENTRY]
Module: support
What:   change
Rank:   minor
Thanks: Alexandre Fayolle
[DESCRIPTION]
No longer depend on availability of timersub.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Optimized n-ary disjunction and conjunction and the clause constraint.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Linear constraints over Boolean variables with unit coefficients
(aka Boolean cardinality constraints) have been
reimplemented. Less memory (minus 30%) and more speed. For
example, BIBD runs 10% faster now.

[ENTRY]
Module: search
What:   change
Rank:   minor
[DESCRIPTION]
Optimized thread creation by thread pools, now the creation and
deletion of arbitrarily many parallel search engines also works
for platforms using pthreads (Linux and MacOS).

[ENTRY]
Module: other
What:   change
Rank:   minor
Thanks:	David Rijsman
[DESCRIPTION]
Compiles with MSVC 2005 again.

[ENTRY]
Module: other
What:   bug
Rank:   minor
[DESCRIPTION]
The configure script checked for Qt 4.2, although Gist requires at least
Qt 4.3.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
Fixed serious bug in the bounds propagator for global cardinality.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
A branching is now a brancher and a branching description is now a choice.
[MORE]
Classes and member functions have been renamed accordingly. The
change is necessary due to proper explanation in the forthcoming
"Programming with Gecode".

[ENTRY]
Module: search
What:   bug
Rank:   minor
[DESCRIPTION]
Compiles again if no threads available.

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
The Gist console now has a toolbar that provides buttons to clear the text
as well as to configure the console window to stay on top of Gist.
Furthermore, after adding output, the console now automatically scrolls to the
bottom.

[ENTRY]
Module: graph
What:   new
Rank:   minor
[DESCRIPTION]
Cost-based variants for circuit added.

[ENTRY]
Module: set
What:   change
Rank:   minor
[DESCRIPTION]
The element constraint with an integer index variable now throws
an exception if used with an empty array.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The element constraint now computes more accurate variable bounds
when being posted (to avoid arithmetic overflow in naive models).

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The element constraint now throws an exception if used with an
empty array.

[ENTRY]
Module: example
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed zero cost edges in TSP examples.

[ENTRY]
Module: example
What:   change
Rank:   minor
[DESCRIPTION]
Examples now use the symmetry-option for symmetry-breaking.
[MORE]
The affected examples are:
  - BlackHole
  - EFPA
  - Pentominoes
  - SteelMill
  .

[ENTRY]
Module: driver
What:   new
Rank:   minor
[DESCRIPTION]
Added new standard option for options called symmetry.

[ENTRY]
Module: int
What:   new
Rank:   minor
Thanks:	Kish Shen
[DESCRIPTION]
Added regret_min and regret_max for IntVar and BoolVar (they were
only available for IntView).

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Moved cumulatives to the new scheduling library.

[ENTRY]
Module: scheduling
What:   new
Rank:   minor
[DESCRIPTION]
Added a new module for scheduling. To use scheduling
constraints, you have to include <gecode/scheduling.hh> and link
against the scheduling library.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Moved circuit to the new graph library.

[ENTRY]
Module: graph
What:   new
Rank:   minor
[DESCRIPTION]
Added a new module for graph constraints. To use graph
constraints, you have to include <gecode/graph.hh> and link
against the graph library.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added branching following Warnsdorff's heuristic for Knights.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added branch and assign for single integer and Boolean variable.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Added branch and assign for single set variable.

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
Thanks: Håkan Kjellerstrand
[DESCRIPTION]
Added element constraints for Matrix interface to arrays.

[ENTRY]
Module: int
What:   new
Rank:   minor
Thanks: Håkan Kjellerstrand
[DESCRIPTION]
Added element constraints for Matrix arrays.

[ENTRY]
Module: set
What:   new
Rank:   minor
Thanks: Håkan Kjellerstrand
[DESCRIPTION]
Added element constraints for Matrix arrays.

[ENTRY]
Module: search
What:   change
Rank:   minor
Thanks: Vincent Barichard
[DESCRIPTION]
Path for search provides top and empty methods.

[ENTRY]
Module: driver
What:   change
Rank:   minor
Bug:    59
Thanks: Luca Di Gaspero
[DESCRIPTION]
The driver takes copies of all string values passed top it.


[RELEASE]
Version: 3.1.0
Date: 2009-05-20
[DESCRIPTION]
This release introduces parallel search, features improved memory
management (can double efficiency on MacOS X), and provides a
reusable command line driver upon popular request. And, of
course, some this and that.

[ENTRY]
Module: set
What:   change
Rank:   minor
[DESCRIPTION]
The set constraint sequentialUnion has been renamed to sequence.

[ENTRY]
Module: example
What:   change
Rank:   minor
[DESCRIPTION]
The parameters of the Hamming Codes example are now configurable
through command line options (instead of hard-coded).

[ENTRY]
Module: search
What:   change
Rank:   minor
[DESCRIPTION]
The stop function of stop objects now also takes a second argument
of type Search::Options. This is in particular useful for
decisions that involve the number of threads used for search.

[ENTRY]
Module: search
What:   new
Rank:   major
[DESCRIPTION]
Added parallel search engines for DFS, BAB, and Restart (but not
LDS). Please make sure to read the section "Parallel search" in
"Modeling with Gecode".
[MORE]
Parallel search is still experimental: creating and destroying a
large number (more than 1000) of search engines (and hence a
large number of threads) might raise exceptions on operating
systems using pthreads as thread implementation. This will be
fixed in a future release by using thread pools.

[ENTRY]
Module: support
What:   new
Rank:   minor
[DESCRIPTION]
Added a tiny portable thread package specifically tailored to the
needs for parallel search. Unfortunately, other portable thread
packages have just too many issues.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed a dead lock that could occur when closing the Gist main window while
search is still running.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
The inspectors are finalized before Gist exits. This fixes a bug
where (at least on Mac OS) some memory was not freed in the
correct order.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Gist now correctly centers the current node after search has finished.

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
Small user interface changes: disable search from hidden nodes, add depth
information to status bar, and add statistics for subtrees (available from the
node context menu and the Node menu).

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
Easily add multiple inspectors to Gist. Inspectors are not
exclusive any longer, you can select any combination of them to
respond to clicks or solutions simultaneously.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The INT_VAL_MED value selection now consistently selects the greatest element
in the domain not greater than the median.

[ENTRY]
Module: driver
What:   change
Rank:   minor
[DESCRIPTION]
If Gist is not available, -mode gist is the same as -mode
solution. Invocation with -help also prints information about how
Gecode has been configured.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added new example for equidistant frequency permutation arrays (EFPA).

[ENTRY]
Module: kernel
What:   performance
Rank:   major
[DESCRIPTION]
Cache memory blocks from deleted spaces. This hardly increases
peak memory consumption. It improves performance on Windows and
Linux only by up to 5%, but on MacOS by 50% in some cases (this
improvement is absolutely essential for parallel execution).

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Added a wait propagator: executes a function when a variable (or
variables) become(s) assigned.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added a wait propagator: executes a function when a variable (or
variables) become(s) assigned.

[ENTRY]
Module: driver
What:   new
Rank:   major
[DESCRIPTION]
Added a new module "driver" as a commandline driver for
scripts. This is due to popular request: most people have been
using the support functionality for examples anyway. This
function is now wrapped into a proper module (and Example is
now called Script to be more general). See "Modeling with Gecode"
for documentation.

[ENTRY]
Module: support
What:   new
Rank:   minor
[DESCRIPTION]
Support::quicksort and Support::insertion support using the less than
operator for the sort order by leaving out the comparator object.


[RELEASE]
Version: 3.0.2
Date: 2009-03-26
[DESCRIPTION]
This is a bug fix release fixing two more embarrassing
bugs. However, this time we redesigned our tests carefully such
that they cover all changes and optimizations done for the
transition from 2.2.0 to 3.0.*. Please update asap.

[ENTRY]
Module: example
What:   bug
Rank:   minor
Thanks: Håkan Kjellerstrand
[DESCRIPTION]
The radiotherapy example was missing in the Makefile.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
Fixed bug in optimization of extensional constraints with DFAs
(hard to reproduce, almost impossible).

[ENTRY]
Module: minimodel
What:   bug
Rank:   major
Thanks: Gustavo Guiterrez
[DESCRIPTION]
Fixed bug in posting of Boolean expressions including reified
linear expressions. Again, that escaped our testsuite (also
fixed).

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Reoptimized element with integer values and created bizarre
testcases.

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
A separator is printed between solutions in the TextInspector.


[RELEASE]
Version: 3.0.1
Date: 2009-03-24
[DESCRIPTION]
This is a bug fix release fixing two embarrassing bugs that were
not caught by our test infrastructure. Please update asap.


[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks: Vincent Barichard
[DESCRIPTION]
Fixed bug in element with integer values.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
IntSetArgs no longer inherit from PrimArgArray, which was wrong
as IntSet is no primitive type and hence does not support vararg
initializers.

[ENTRY]
Module: example
What:   bug
Rank:   minor
[DESCRIPTION]
The examples now pass the c-d and a-d command line options correctly to Gist.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks: Alberto Delgado
[DESCRIPTION]
Fixed bug in reified Boolean linear constraints (an optimization
is currently disabled and will be active in the next release: the
optimization was incorrect and was never tested).

[ENTRY]
Module: example
What:   bug
Rank:   minor
Bug:    56
Thanks: Chris Mears
[DESCRIPTION]
The Steel Mill Slab Design example had two bugs in the search
heuristic and a missing redundant constraint.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added new example for Radiotherapy.



[RELEASE]
Version: 3.0.0
Date: 2009-03-13
[DESCRIPTION]
This release is a major consolidation release: interfaces have
been cleaned up (consistent parameter passing, consistent naming,
simpler Gist interface, namespaces for operator overloading);
some functionality has been extended (propagators can be
non-monotonic; branchings support tie-breaking and random
variable and value selection); some functionality that did not
meet our quality goals has been removed (complete set variables,
reflection); usage has been simplified (auto-linking on Windows,
more commonly used filename extensions); important aspects have
been optimized (memory management, memory usage and efficiency on
64bit machines). These cleanups were in particular necessary to
make %Gecode easier to document (this release is the first to be
accompanied by tutorial documentation explaining how to model
with %Gecode).

Apart from that, many small fixes and additions. Please see below
for the details.

As the interfaces have changed considerably, please consult \ref
PageHowToChange_3 "How to Change to Gecode 3.0.0".

[ENTRY]
Module: example
What:   performance
Rank:   minor
Thanks:	Håkan Kjellerstrand
[DESCRIPTION]
Improved branching for Nonogram examples.

[ENTRY]
Module: set
What:   bug
Rank:   minor
Thanks:	Stefano Gualandi
[DESCRIPTION]
Fixed bug in creation of set variables.

[ENTRY]
Module: kernel
What:   bug
Rank:   major
Thanks:	Vincent Barichard
[DESCRIPTION]
Updating of a council of advisors crashed if a propagator has no
advisors (as we had no example of this kind of propagators).

[ENTRY]
Module: set
What:   change
Rank:   minor
[DESCRIPTION]
Element and convexity constraints on set variables have a more
uniform interface, and the match constrained has been renamed to
channel.

[ENTRY]
Module: gist
What:   change
Rank:   minor
[DESCRIPTION]
Gist now takes an optional argument specifying options for the
search, including the inspectors to be used. The Qt interface has
been cleaned up, so that Gist is easier to extend.

[ENTRY]
Module: gist
What:   new
Rank:   minor
[DESCRIPTION]
Added inspectors that react on every solution instead of a double
click.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
A TupleSet must be finalized before an extensional constraint can
be posted using it.

[ENTRY]
Module: set
What:   removed
Rank:   minor
[DESCRIPTION]
Removed automatically generated set projectors, they will come
back eventually. This makes no change to the available
functionality for set variables.

[ENTRY]
Module: cpltset
What:   removed
Rank:   major
[DESCRIPTION]
Complete sets have been removed (just not good enough).

[ENTRY]
Module: kernel
What:   new
Rank:   minor
Author:	Filip Konvicka
[DESCRIPTION]
Integrated space and region-based allocators that work with STL
classes.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in domain consistent min and max propagators.

[ENTRY]
Module: int
What:   performance
Rank:   major
Author:	Tias Guns
[DESCRIPTION]
Integrated an efficient implementation of reified linear
constraints over Boolean variables.

[ENTRY]
Module: example
What:   bug
Rank:   minor
Thanks:	Stefano Gualandi
[DESCRIPTION]
A bug in the independent set example has been fixed (most edges
were ignored).

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
More set branching strategies have been added (for instance random variable
and value selection), as well as set assignment.

[ENTRY]
Module: other
What:   removed
Rank:   major
[DESCRIPTION]
All support for reflection has been removed: not clean enough,
not powerful enough, too difficult, and too much trouble.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
Thanks:	Denys Duchier
[DESCRIPTION]
Added support for synchronized execution during branching
(executes a function).

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The specification of propagation cost has changed. It now must be
computed by the static member functions of the class
Gecode::PropCost.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added support for synchronized execution that executes a function
or a static member function when a Boolean variable becomes
assigned (called when).

[ENTRY]
Module: int
What:   change
Rank:   minor
Thanks:	David Rijsman
[DESCRIPTION]
Make the variable deltas generated for minus_r more meaningful if
possible.

[ENTRY]
Module: iter
What:   documentation
Rank:   minor
Thanks:	Anden Blah, Morten Boysen
[DESCRIPTION]
Mention that arrays for Iter::Values::Arrays must be sorted.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks:	Roland Yap Hock Chuan
[DESCRIPTION]
Fixed off-by-one bug in extensional for DFAs.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The clone operation on spaces is now const.

[ENTRY]
Module:	int
What:	change
Rank:	minor
[DESCRIPTION]
TupleSet now accepts duplicate tuples.

[ENTRY]
Module:	int
What:	change
Rank:	minor
[DESCRIPTION]
Renamed size() to ranges() for IntSet (returning the number of
ranges). Added a size() and width() function that return the size
and width of the set respectively.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Introduced CopiedHandle as a new base class for SharedHandle.
[MORE]
A copied handle provides access to an object that is used by
entities in a space, and that is copied when then space is
copied. This abstraction can be used e.g. to pass information
between different entities in a space, such as between
propagators and branchings.

[ENTRY]
Module: support
What:   bug
Rank:   minor
Thanks:	Michal Dobrogost
[DESCRIPTION]
Sorting (quicksort and insertion) require strict orders and now
work with arrays of more than 2^32 elements.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Integer sets can now be initialized from integer argument arrays.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Thanks: Chris Mears
[DESCRIPTION]
Output operators (<<) now respect formatting width and work with
output streams using arbitrary character types.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
Thanks: Denys Duchier
[DESCRIPTION]
Made macros semicolon-safe.

[ENTRY]
Module: set
What:   bug
Rank:   minor
Thanks: Denys Duchier
[DESCRIPTION]
Fixed constructors for set variables. They now throw proper exceptions when
trying to create empty variable domains.

[ENTRY]
Module: set
What:   new
Rank:   minor
Thanks: Denys Duchier
[DESCRIPTION]
Added reified propagators constraining an integer variable to be the minimum
or maximum element of a set variable.

[ENTRY]
Module: int
What:   removed
Rank:   minor
[DESCRIPTION]
Support for PropKind has been removed for all but extensional constraints.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Domain constraints (dom) also accept integers now.

[ENTRY]
Module: other
What:   change
Rank:   major
Thanks: Max
[DESCRIPTION]
All operators are now in their correct namespace.

[ENTRY]
Module: minimodel
What:   change
Rank:   minor
[DESCRIPTION]
LinExpr, LinRel, BoolExpr are now part of the Gecode namespace
rather than Gecode::MiniModel (to support operator resolution).

[ENTRY]
Module: test
What:   new
Rank:   minor
[DESCRIPTION]
Tests for testing claims of bounds(Z) and bounds(D) consistency. These
tests would have found the bug in the binary min and max propagators.
[MORE]
An integer test can enable these new tests by setting the contest member
to CTL_BOUNDS_Z or CTL_BOUNDS_D. For domain-consistency propagators
the contest member is set automatically to CTL_DOMAIN. If no
consistency-testing should be done, contest should be set to CTL_NONE.

[ENTRY]
Module: search
What:   new
Rank:   minor
[DESCRIPTION]
The search engines now collect statistics for the number of nodes
visited and the maximum depth of the search tree. The information
for number of clone and commit operations has been removed as it
was too confusing.

[ENTRY]
Module: search
What:   new
Rank:   major
[DESCRIPTION]
Search engines have been completely reimplemented.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Jonathan Cederberg
[DESCRIPTION]
The binary min and max propagators did not do all pruning they
should do.
[MORE]
Given the constraint x = max(y,z) with the store {x->{1,2,3},
y->{1,2}, z->{3}}, propagation did not yield any new information
(now it gives the correct result {x->{3}, y->{1,2}, z->{3}}).

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
New example: the steel mill slab design problem (Problem 38 in <a
href="http://csplib.org">CSPLib</a>).
[MORE]
The model used is from Gargani and Refalo, "An efficient model and
strategy for the steel mill slab design problem.", CP 2007. The
symmetry-breaking search is from Van Hentenryck and Michel, "The Steel
Mill Slab Design Problem Revisited", CPAIOR 2008.

[ENTRY]
Module: iter
What:   bug
Rank:   minor
Thanks: Stefano Gualandi
[DESCRIPTION]
Fixed init method of SingletonAppend range iterator.

[ENTRY]
Module: example
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed a bug in the extensional propagation-version of the domino example.

[ENTRY]
Module: other
What:   new
Rank:   minor
[DESCRIPTION]
For the Microsoft compiler, auto-link information is added during
compilation.
[MORE]
That is, by including %Gecode headers during
compilation the right libraries will be found automatically
during linking. To simplify development and deployment, the
libraries (and DLLs) encode version, platform, and build type
(release or debug) in their filename.

[ENTRY]
Module: minimodel
What:   performance
Rank:   minor
[DESCRIPTION]
Posting constraints according to Boolean expressions now uses a
negation normalform and by this avoids any propagator for
negation and uses fewer propagators due to the new clause constraint.

[ENTRY]
Module: other
What:   change
Rank:   major
[DESCRIPTION]
Changed naming scheme for files.
[MORE]
All files with extension .cc have been renamed to .cpp, and .icc
has become .hpp. This avoids conflicts as .icc is typically used
for other file types. All include directives are now specified
using <...> notation instead of "...", so that %Gecode headers do
not clutter the include namespace of a client program.

[ENTRY]
Module: minimodel
What:   change
Rank:   minor
[DESCRIPTION]
The Matrix class is now in the Gecode namespace (and not in
Gecode::MiniModel).

[ENTRY]
Module: set
What:   change
Rank:   minor
[DESCRIPTION]
Reorganized the internal data structures of set variables so that each
variable takes up 8 bytes less memory on 64 bit machines.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The index structure for variable dependencies is now implemented using integers
instead of pointers, saving memory on 64 bit machines.
[MORE]
For example, the index
structure of integer variables is now 40% smaller, for Boolean variables
(which have the smallest possible index structure) we still save 16%.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added a Boolean clause constraint that supports conjunction and
disjunction of both positive and negative variables.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Now n-ary Boolean disjunction and conjunction are constant time
(rather than linear time, as before), even when a variable for
the result is used.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
%Gecode now supports weakly monotonic propagators.
[MORE]
A weakly monotonic propagator must only be able to decide for
assignments whether they are solutions or not (which is a very
natural property as it means the propagator must be a correct
implementation of a constraint). Otherwise, the propagator does
not have to be monotonic, it can even be indeterministic.

Weakly monotonic but not monotonic propagators must notify a
space about their existence: if a weakly monotonic propagator is
created, it must execute "home.notice(*this,AP_WEAKLY)"; if it is
disposed, it must execute "home.ignore(*this,AP_WEAKLY)".

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The functions force and unforce of an actor to force disposal
have been removed.
[MORE]
Now, the new interface based on notice and ignore using actor
properties must be used instead. So, instead of "force(home)",
write "home.notice(*this,AP_DISPOSE)" and, instead of
"unforce(home)", write "home.ignore(*this,AP_DISPOSE)".

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
The incremental extensional propagator for tuplesets uses less
memory (around 25%) and reports its size correctly.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
The element propagator for integer arrays now chooses
datastructures according to and the elements of the array.
[MORE]
This can save more than 80% memory on a 64 bit machine, and up to
75% on a 32 bit machine. In common cases, one can expect a
reduction by at least 50%.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
The regular propagator now chooses datastructures according to
the size of the DFA. This can save up to 80% memory on a 64 bit
machine, and still up to 50% on a 32 bit machine.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The home space is now also passed to the cost function of a propagator.

[ENTRY]
Module: other
What:   change
Rank:   major
[DESCRIPTION]
Now everything is passed as reference (Space, Propagator,
ModEventDelta, Advisor, Branching, and BranchingDesc).
[MORE]
The reason for this massive change is to be more C++ compliant
and make the interfaces more consistent (at some places things
were passed as references and at other places as pointers, for no
obvious and explainable reason). Routines that create objects
rather than pass them (such as copy, clone, or description) still
return a pointer to an object (so that it can actually be
deleted!).

You will have to rewrite your models and other programs using
%Gecode. For models this is easy enough:
 - Replace "(Space* home" by "(Space& home".
 - Replace "home->" by "home.".
 - Replace "(this" by "(*this".
 .
That should do the trick for 99% of the models.

For the other changes, just lookout for the changes in types and
that "this" becomes "*this" now.

[ENTRY]
Module: other
What:   change
Rank:   major
[DESCRIPTION]
The memory management has been completely reworked.
[MORE]
It is now more robust, more portable (does not use alloca any
longer), more efficient, fits C++ better and is much easier too
understand. There are now three memory areas: a single heap,
spaces, and regions. Heap and spaces are as before. A region (an
object of class Region) is a simple and very efficient memory
manager for temporary memory managed in a stack fashion. These
three memory managers provide uniform operations for allocation
(alloc), deallocation (free), and reallocation (realloc). These
operations use constructors, destructors, and assignment
operators as required by C++ and are implemented with efficient
specializations for basic data types.

[ENTRY]
Module: support
What:   removed
Rank:   minor
[DESCRIPTION]
PQueue has been removed (too specialized to be reused anyway).

[ENTRY]
Module: support
What:   removed
Rank:   minor
[DESCRIPTION]
GECODE_AUTOARRAY has been removed. Use a Region for memory
management instead.

[ENTRY]
Module: support
What:   removed
Rank:   minor
[DESCRIPTION]
GECODE_AUTOSTACK and SentinelStack has been removed. Use
StaticStack instead.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Simpler and more efficient memory management for element
propagators (integer arrays).

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
All functions for checking sharing for arrays (same, shared,
unique) require a space argument (for memory management).

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
Added MinimizeSpace and MaximizeSpace classes for cost-based
optimization (requires implementing a cost function returning an
integer cost variable). Optimization can now be implemented by
inheriting from these classes rather than from Space and by
implementing a cost function.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The description() member function of a space is not any longer
const: it can be called at most once.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The constrain method used for best solution search must be
virtual and takes an argument of type const Space& rather than
Space* as argument.

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
Tie-breaking and random selection for branch is now supported.

[ENTRY]
Module: set
What:   change
Rank:   major
[DESCRIPTION]
The values for variable and value selection for branching have
been made consistent and extended.
[MORE]
The following values have been renamed:
 - SET_VAR_MIN_CARD -> SET_VAR_SIZE_MIN
 - SET_VAR_MAX_CARD -> SET_VAR_SIZE_MAX
 - SET_VAR_MIN_UNKNOWN_ELEM -> SET_VAR_MIN_MIN
 - SET_VAR_MAX_UNKNOWN_ELEM -> SET_VAR_MAX_MAX
 - SET_VAL_MIN -> SET_VAL_MIN_INC
 - SET_VAL_MAX -> SET_VAL_MAX_INC
 .
Tie-breaking and random selection is now supported.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The variable selection INT_VAR_DEGREE_MIN and INT_VAR_DEGREE_MAX
do not have tiebreaking with smallest domain size built in.
[MORE]
The old behavior can be reclaimed by explicit tiebreaking, for
example replace INT_VAR_DEGREE_MAX by
tiebreak(INT_VAR_DEGREE_MAX,INT_VAR_SIZE_MIN).

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
View and value branchings have been completely reimplemented to support
tie-breaking and state (for randomized selection).

[ENTRY]
Module: kernel
What:   removed
Rank:   major
[DESCRIPTION]
View and value assignments have been removed as they now can be
expressed by view and value branchings.


[RELEASE]
Version: 2.2.0
Date: 2008-08-25
[DESCRIPTION]
This release adds many domain consistent propagators for
arithmetic constraints and fixes a number of bugs. Some of these
bugs fixed are potentially serious, in particular as they occur
very seldom. Please change to 2.2.0 as soon as possible (in
particular if you are using the 64bit Microsoft Visual C++
compiler). And, of course, the usual small fixes and changes.

[ENTRY]
Module: kernel
What:   bug
Rank:   major
[DESCRIPTION]
Fixed a bug in the memory alignment on Windows 64bit (very hard to reproduce).

[ENTRY]
Module: other
What:   new
Rank:   minor
[DESCRIPTION]
Added configure options for adding a prefix and a suffix to the names of the
compiled libraries.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
Fixed a bug in the domain consistent distinct propagator that would cause
a stack overflow under rare circumstances.

[ENTRY]
Module: set
What:   bug
Rank:   major
[DESCRIPTION]
The ternary intersection propagator was incorrect if any of the sets had a
maximum cardinality of Set::Limits::card.

[ENTRY]
Module: int
What:   new
Rank:   minor
Thanks:	Raphael Reischuk
[DESCRIPTION]
The attempt to access the value of an unassigned integer or
Boolean variable (IntVar or BoolVar) throws an exception now.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added bounds consistent division/modulo propagator.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
All functional linear and arithmetic constraints now put sharp
bounds on the output variable (eases interfacing to modelling
languages).

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
The channel constraint now comes in a version that allows to specify offsets
to the array indices.

[ENTRY]
Module: example
What:   removed
Rank:   minor
[DESCRIPTION]
Example-based support for SAC (singleton arc consistency) has
been removed. Might be reintroduced later in a more general
fashion.

[ENTRY]
Module: other
What:   new
Rank:   minor
[DESCRIPTION]
The Makefile has a new target, check, which performs a minimal integrity check
using some tests from the test suite.

[ENTRY]
Module: set
What:   change
Rank:   minor
[DESCRIPTION]
The set selection constraints are now called element.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug for domain-consistent distinct that never occurred in
practice.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug that could potentially have affected certain staged
propagators.

[ENTRY]
Module: kernel
What:   documentation
Rank:   minor
Thanks:	David Rijsman
[DESCRIPTION]
Fixed explanation of ES_FIX and ES_NOFIX for advisors
(description was mixed up).

[ENTRY]
Module: other
What:   change
Rank:   minor
[DESCRIPTION]
The configure script now always uses the Microsoft compiler on Windows. Use
the CC and CXX environment variables to override this if you want to use
gcc.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added domain consistent multiplication propagator.

[ENTRY]
Module: kernel
What:   bug
Rank:   major
Thanks: Filip Konvicka
[DESCRIPTION]
Generated variable stubs were wrong (could only be observed for
new variable types).

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: David Rijsman
[DESCRIPTION]
Cumulatives did not do all the pruning it should do.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in element with IntArgs and sharing between the two IntVars.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Jaroslav Mlejnek
[DESCRIPTION]
Fixed bug in sqrt.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: David Rijsman
[DESCRIPTION]
Fixed bug in ValSplitMin::branchingSpec.

[ENTRY]
Module: kernel
What:   removed
Rank:   minor
[DESCRIPTION]
Removed ViewTuple. Just not useful enough...

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Cleaned up Reflection::Var type, overloading did not conform to the C++
standard.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added domain consistent minimum (min) and maximum (max) propagators.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added domain consistent square root propagator (sqrt).

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added domain consistent squaring propagator (sqr).

[ENTRY]
Module: int
What:   documentation
Rank:   minor
[DESCRIPTION]
Added documentation for domain consistent absolute value (abs) propagator.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added reified propagators for relations over Boolean variables.

[RELEASE]
Version: 2.1.1
Date: 2008-03-06
[DESCRIPTION]
This is a bugfix release.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Non-shared copying of dfa was broken (matters only for parallel execution).

[ENTRY]
Module: kernel
What:   bug
Rank:   major
[DESCRIPTION]
The generated med_updated function was incorrect, resulting in potential
crashes of programs that use SetVars.

[ENTRY]
Module: cpltset
What:   documentation
Rank:   minor
[DESCRIPTION]
The CpltSet variables are now in the correct documentation group.

[ENTRY]
Module: gist
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed redraw artefacts on Windows.

[ENTRY]
Module: other
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed boost serialization.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Made the constructor of Reflection::Var explicit, otherwise overloading for
output stream operators does not work as expected.


[RELEASE]
Version: 2.1.0
Date:    2008-02-29
[DESCRIPTION]
This release makes two essential contributions: a partly
reimplemented kernel that is faster, is simpler, and uses less
memory and lots of small and not so small fixes. This release is
the first release where really everything that we can test
(rather than everything that we initially believed to matter) has
been systematically tested. So, better switch now to 2.1.0!

Apart from that, the value range for variables has been increased
(basically, 32 bits minus three values, so that is 32 bits), the reflection
API is now fully functional and no longer considered experimental, and we have
the usual small additions.


[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added interface to extensional constraints defined by TupleSets with
BoolVars.

[ENTRY]
Module: minimodel
What:   bug
Rank:   major
[DESCRIPTION]
Reimplemented linear expressions from scratch, they were just
hopelessly screwed.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
[DESCRIPTION]
Added work-around for compiler bug in MSVC.

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
Support reified linear expressions with Boolean variables.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Throw an exception if variables occur multiply for array-based
channel constraints.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed multiplication propagator for x*y=x.

[ENTRY]
Module: search
What:   change
Rank:   major
[DESCRIPTION]
All search engines now take an option value for configuration
instead of individual arguments for recomputation, stop objects,
etc.

[ENTRY]
Module: minimodel
What:   removed
Rank:   minor
[DESCRIPTION]
Removed scheduling abstractions.

[ENTRY]
Module: int
What:   removed
Rank:   minor
[DESCRIPTION]
Removed extensional constraints with offset arguments.

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
All minimodel functionality now understands both IntConLevel and
PropKind arguments.

[ENTRY]
Module: set
What:   bug
Rank:   major
[DESCRIPTION]
Fixed bugs in several set constraints:
rel(Space*,SetVar,IntRelType irt,IntVar) for irt=IRT_NQ,
rel(Space*,SetVar,SetOpType sot,const IntSet&,SetRelType srt,SetVar) for
sot=SOT_MINUS, srt=SRT_SUP, selectDisjoint, selectUnion with constant IntSet
arguments, dom with SRT_NQ.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in unreflection of empty VarArrays.

[ENTRY]
Module: int
What:   bug
Rank:   major
[DESCRIPTION]
Fixed overflow checking error in linear constraints.

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
Added sqrt function.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added sqrt propagator.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added sqr post function.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
The overloaded versions of dom for variable arrays could not be
resolved automatically.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added missing branching for INT_VAR_SIZE_DEGREE_MIN and
INT_VAR_SIZE_DEGREE_MAX for Boolean variables.

[ENTRY]
Module: minimodel
What:   bug
Rank:   major
Thanks:	Stanimir Dragiev
[DESCRIPTION]
Fixed bug in posting linear expressions.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
IntSet have been reimplemented for efficiency.

[ENTRY]
Module: other
What:   documentation
Rank:   minor
Thanks: Martin Mann
[DESCRIPTION]
Function prototypes are now highlighted in the detailed function documentation.

[ENTRY]
Module: int
What:   removed
Rank:   minor
[DESCRIPTION]
The offset arguments for element constraints have been removed, as you can
simply add dummy elements to the array to achieve the same effect.

[ENTRY]
Module: set
What:   removed
Rank:   minor
[DESCRIPTION]
The offset arguments for selection constraints have been removed, as you can
simply add dummy elements to the array to achieve the same effect.

[ENTRY]
Module: other
What:   new
Rank:   major
[DESCRIPTION]
The serialization library now contains a registry of all the %Gecode post
functions. This makes interfacing to %Gecode much easier. The registry is
automatically generated from the post functions defined in gecode/int.hh and
gecode/set.hh.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Cleaned up reflection. Unreflection is now part of the kernel instead of the
serialization library. Branchings now provide a human-readable description of
a BranchingDesc. The name function of a Propagator has been renamed to ati
(actor type identifier). All reflection is now const where possible.
Unreflection of variables now checks dynamically that the variable types
match. Unreflection of propagators checks the number of arguments. A
tutorial-style section on reflection has been added to the documentation.

[ENTRY]
Module: set
What:   change
Rank:   major
[DESCRIPTION]
The limits for set variables have been moved from Limits::Set to
Set::Limits.

The range of set variables has been adapted to the range of
integer variables.  For example, on a standard machine
(regardless of 32 or 64 bits), a set can hold values from -2^30+2
to 2^30-2, its maximum cardinality therefore is 2^31-3.

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
The limits for set variables have been moved from Limits::Set to
Set::Limits.

The range of integer variables have been extended by one bit. For
example, on a standard machine (regardless of 32 or 64 bits), the
largest possible integer value for an integer variable is 2^31-2,
the smallest -2^31+2. With other words, only the integer values
2^31-1, -2^31, and -2^31+1 are missing from the two-complement
representation (and we will never use these values for the sake
of mental sanity. We promise.).

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Distinct with integer offsets checks accurately for overflow now.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Boolean variables consume 20% less memory.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
Only stable and non-failed spaces can be cloned, otherwise
Space::clone raises an exception. This makes cloning and
propagation fully orthogonal. To emulate the old behavior, just
execute Space::status before Space::clone.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The number of propagators and branchings can be accurately
retrieved from both failed and non-stable spaces.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added an example that interprets a JavaScript program and runs a search of the
model that the program encodes. This is an example of how to use the
JavaScript interpreter. A simple JavaScript model for n-Queens has been added,
too.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
A generic variable class has been added that can be used for interfacing. It
can store arbitrary %Gecode variables (e.g. IntVar and SetVar), and cast them
back using a run-time type check. The update, reflection, and output
operations are implemented through the reflection registry.

[ENTRY]
Module: other
What:   new
Rank:   major
[DESCRIPTION]
(De-)Serialization to and from JavaScript added.

[ENTRY]
Module: other
What:   change
Rank:   major
[DESCRIPTION]
Both the cost and propagate function of a propagator take the
current modification event delta as input. Likewise,
retrieving the modification event for a particular View must use
the static function View::me with the passed
modification event delta. Again, this feature committed the kernel to a
particular implementation which might not be available in the
future.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Views and variables do not any longer reveal whether they have
been modified: this feature committed the kernel to a particular
implementation which might not be available in the future.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Simple Singleton Arc Consistency pre-processing has been added as an
optional step for examples.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The kernel has undergone some cleanups and improvements (much of
it got actually reimplemented):
 - Automatically generated stubs for variable implementations are directly
   inlined into the kernel. This improves performance, but more
   importantly, lifts some limits on the number of variables. Now, the
   only limit is that the sum of the ceiling of the logarithms of the
   number of modification events of all variables does not exceed 32
   (as an estimate, the kernel now can handle around 10 to 16 variable
   types). Moreover, if the need for more variable types arises this is
   straightforward to do.
 - The addition of new variable types for users has been simplified.
 - The main propagation loop has been entirely rewritten (much much simpler).
   Now, the kernel does not optimize any longer for the case that a
   variable is modified more than once during propagator execution.
   While this changes the asymptotic complexity, it reduces the propagator
   execution overhead by up to 30%. And a propagator is still free
   to make sure that a variable is modified only once (many propagators
   do that already).
 - Variable implementations became smaller by one word. Now variable
   implementations are optimal in the sense that no additional memory
   is needed for cloning or book-keeping, the memory required for
   propagation is sufficient.
 - Spaces have lost some weight as memory for datastructures only used
   during cloning or propagation are shared (saves some 25% of memory
   per space).

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
Propagator modification events have been renamed to modification event
deltas (because that is what they are).

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
To not confuse variable implementations with variables, variable
implementations are now always called VarImp, and not Variable.

[ENTRY]
Module: gist
What:   new
Rank:   major
[DESCRIPTION]
The %Gecode Interactive Search Tool (Gist), a Qt-based graphical search
engine, is now part of the main %Gecode distribution. It is currently included
as an experimental beta preview and may not be completely stable yet.


[RELEASE]
Version: 2.0.1
Date:    2008-02-07
[DESCRIPTION]
This is a bug-fix only release. Very unfortunately, it fixes
three serious bugs in search (LDS, Restart, and assignment
branchings). We highly encourage you to switch to Gecode 2.0.1 as
soon as possible.

[ENTRY]
Module: test
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed memory leak in reflection tests.

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed memory leak in set projection propagators.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed memory leak in IntSet.

[ENTRY]
Module: test
What:   new
Rank:   major
[DESCRIPTION]
Added comprehensive tests for all search engines.

[ENTRY]
Module: search
What:   bug
Rank:   major
[DESCRIPTION]
Assignment branchings wrongly reported that they feature two alternatives
rather than one.

[ENTRY]
Module: search
What:   bug
Rank:   major
Thanks: Stefano Gualandi
[DESCRIPTION]
LDS had numerous quirks. It has been fixed and greatly improved:
it detects when the entire search tree has been probed,
independent of the maximal discrepancy.

[ENTRY]
Module: search
What:   bug
Rank:   major
Thanks: Stefano Gualandi
[DESCRIPTION]
Restart was broken in case the problem failed immediately with
propagation only, both when being initialized or when requesting
a next solution.

[ENTRY]
Module: iter
What:   bug
Rank:   minor
Thanks: David Barton
[DESCRIPTION]
Changed Ranges::Diff to make older versions of gcc happy.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Thanks: David Barton
[DESCRIPTION]
Fixed linking order so that static linking works again.

[ENTRY]
Module: int
What:   new
Rank:   minor
Thanks:	Mohamad Rabbath
[DESCRIPTION]
Re-added reified linear constraints for Boolean variables.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Domain-consistent abs could crash in certain (extremely rare) border cases.

[ENTRY]
Module: kernel
What:   bug
Rank:   major
[DESCRIPTION]
Static initialization order was undefined, making reflection work unreliably.
In particular, linking Gecode statically did not work.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Initializing an IntVar with an empty IntSet did not throw the appropriate
exception but crashed.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Exceptions did not have rtti information when compiled with gcc and
visibility, which meant that they could not be caught.

[ENTRY]
Module: example
What:   bug
Rank:   minor
Thanks:	Helmut Simonis
[DESCRIPTION]
Fixed a bug and quirk in %Kakuro puzzles.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The VarMapIter can now return both a specification and the actual VarBase* of
the currently iterated variable.

[ENTRY]
Module: other
What:   bug
Rank:   minor
[DESCRIPTION]
Revived boost serialization.  The serialization functions will be compiled if
Gecode is configured with --with-boost.

[ENTRY]
Module: kernel
What:   performance
Rank:   minor
[DESCRIPTION]
Be less aggressive in increasing size of heap chunks.

[ENTRY]
Module: int
What:   documentation
Rank:   minor
[DESCRIPTION]
Fixed bug in documentation of table-based extensional constraint.

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed a bug in the hash function for pointers, which could return
negative array indices.



[RELEASE]
Version: 2.0.0
Date:    2007-11-14
[DESCRIPTION]
As witnessed by the version number change, this is a major
release with too many changes, fixes, and additions to mention
them all: please consult the changelog.

The highlights are:
 - New propagators: channeling between Integer variable and array
   of Boolean variables, circuit, table constraint (extensional),
   incremental regular constraint (extensional), incremental
   Boolean linear constraints
 - Boolean variables have a dedicated implementation: twice as
   fast, half the memory
 - Advisors for incremental propagation (see: Lagerkvist,
   Schulte, Advisors for Incremental Propagation, CP 2007)
 - Many crucial performance and scalability improvements: memory
   management, memory footprint of propagators
 - Many cleanups and more documentation, many new examples
 - New set variables with complete domain representation
   (CpltSetVar) [experimental]
 - A reflection API to query spaces about their propagators
   [experimental]

The features marked as experimental are all functional, but might
be revised in the next releases.

As %Gecode 2.0.0 is a major release, you might have to adapt your
programs:  \ref PageHowToChange_2 "How to Change to Gecode 2.0.0".

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Added table-based extensional constraint.

[ENTRY]
Module: other
What:   new
Rank:   minor
[DESCRIPTION]
When compiling with gcc, the default visibility of symbols in the
generated dynamic library is set to hidden.

[ENTRY]
Module: set
What:   removed
Rank:   minor
[DESCRIPTION]
Removed buggy distinct propagator for finite sets.

[ENTRY]
Module: example
What:   new
Rank:   minor
Thanks:	Helmut Simonis
[DESCRIPTION]
New example: %Kakuro puzzles.

[ENTRY]
Module: other
What:   new
Rank:   minor
Thanks: Martin Mann
[DESCRIPTION]
Added dist and distdir targets for creating source distribution.

[ENTRY]
Module: other
What:   new
Rank:   minor
Thanks: Filip Konvicka
[DESCRIPTION]
On windows with MSVC, always build program database files to ease
debugging of applications using %Gecode (files are also included in
packages).

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
Added new variable selection based on largest or smallest
quotient of size and degree.

[ENTRY]
Module: other
What:   new
Rank:   minor
[DESCRIPTION]
Variable arrays, view arrays, and argument arrays can directly be
printed on standard output streams.

[ENTRY]
Module: other
What:   change
Rank:   minor
[DESCRIPTION]
The structure of includes has been drastically
simplified. Support for iterators ("gecode/iter.hh") is
automatically included with integers ("gecode/int.hh") and sets
("gecode/set.hh"). Likewise, all support functionality becomes
available by including "gecode/support.hh" (one can assume that
this is included in "gecode/kernel.hh").

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Shared arrays are now available in the kernel (where they properly
belong). This entails that they are available in the Gecode
namespace and not in Gecode::Support.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The extensional constraint specified by a DFA or a regular
expression (formerly known as regular) is now named "extensional"
rather than "regular".

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed small quirk in posting an absolute propagator via a function.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Added channeling propagator between a SetVar and a BoolVarArray
that propagates the characteristic function of the set to the
Boolean variables.

[ENTRY]
Module: set
What:   performance
Rank:   minor
[DESCRIPTION]
Changed the datastructure for set variables to use singly-linked
lists.

[ENTRY]
Module: other
What:   change
Rank:   minor
[DESCRIPTION]
The values (and types) for selecting how to branch have been made
uniform for all variables types: they start with INT_ (or SET_ or
CPLTSET_), followed by either VAL or VAR and the respective
strategy.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The interface for the global cardinality constraint has been simplified.
The constraint is now called count.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Regular expressions (REG) have been moved from the integer module to
the minimodel module.

[ENTRY]
Module: example
What:   change
Rank:   major
[DESCRIPTION]
Most examples have been cleaned up.

[ENTRY]
Module: example
What:   change
Rank:   minor
[DESCRIPTION]
Parsing of commandline arguments has been completely redone and
is much more extensible and flexible.

[ENTRY]
Module: other
What:   change
Rank:   minor
[DESCRIPTION]
All of %Gecode has been put under the MIT license (which the
previous license was a simple rewording of).

[ENTRY]
Module: other
What:   bug
Rank:   minor
[DESCRIPTION]
Removed huge number of casts that could (only potentially)
compromise portability.

[ENTRY]
Module: set
What:   new
Rank:   minor
[DESCRIPTION]
Finite set projectors can now be specified using formulas, in addition to
set expressions.

[ENTRY]
Module: cpltset
What:   new
Rank:   major
[DESCRIPTION]
Finite integer set variables with complete domain representation,
based on binary decision diagrams (BDDs), have been added as a
new variable type.

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
A reflection API has been added, which allows querying spaces
about the variables and propagators they contain.

[ENTRY]
Module: kernel
What:   bug
Rank:   major
[DESCRIPTION]
Branching ids were not properly initialized. This was a serious
problem if you posted branchings in spaces other than the root
space.

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
Iterator-based domain operations have been renamed,
reimplemented, and extended. Now operations for both range and
value iterators are supported and the operations can be told to
perform more efficient destructive updates.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Sortedness constraints have been renamed to sorted constraints.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
VarArrays can now be resized dynamically.

[ENTRY]
Module: int
What:   performance
Rank:   major
[DESCRIPTION]
Boolean linear equations and inequalities with constant
right-hand sides use constant time propagators whenever
appropriate (linear time with less overhead and memory for
propagators with few variables).

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
Added advisors as an abstraction for incremental propagation:
advisors are executed for their propagator whenever their view
changes. Advisors, when not being used, add one word of overhead
to each variable and slow down the system in the worst case by
less than 1%. In average, no slowdown can be observed.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed a border-case bug for n-ary Boolean conjunction and disjunction.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
A new propagation condition PC_GEN_NONE (and hence, PC_INT_NONE,
...) has been introduced. Propagator patterns with this
propagation condition now do not create any subscriptions.

[ENTRY]
Module: int
What:   performance
Rank:   major
[DESCRIPTION]
The regular constraint has been reimplemented, the new version
runs more than twice as fast.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added a model for the traveling salesman problem, mostly
intended to exercise the new circuit constraint (as the model is not
very competitive).

[ENTRY]
Module:	kernel
What:	new
Rank:	major
[DESCRIPTION]
Support for reference-counted shared objects added: they handle
both reference counting as well as non-shared copying. This fixes
some bugs with the handling of shared arrays, integer sets, and
finite automata.


[ENTRY]
Module:	example
What:	bug
Rank:	minor
[DESCRIPTION]
Examples reported wrong number of propagator invocations (the
invocations for problem setup were missing).

[ENTRY]
Module:	kernel
What:	new
Rank:	major
[DESCRIPTION]
Added classes for shared objects and handles. Handles to shared
objects allow to either share copies among spaces when being
copied or to create a new shared copy, if requested.

[ENTRY]
Module:	int
What:	new
Rank:	minor
Thanks:	Martin Mann
[DESCRIPTION]
Added a new version of count (and also atleast, atmost, exactly)
that counts the number of variables equal to integers in an
array.

[ENTRY]
Module:	example
What:	bug
Rank:	minor
Bug:	50
[DESCRIPTION]
The number of colors in graph-color was off by one.

[ENTRY]
Module:	int
What:	new
Rank:	major
[DESCRIPTION]
Added channel constraints that channel an integer variable to
either a single or an array of Boolean variables.

[ENTRY]
Module:	int
What:	bug
Rank:	minor
[DESCRIPTION]
Fixed bug in copying of n-ary or-propagator for a special boundary case.

[ENTRY]
Module:	int
What:	new
Rank:	minor
[DESCRIPTION]
Relaxed sharing restrictions for channel, in particular
channel(this, x, x) is allowed.

[ENTRY]
Module:	int
What:	new
Rank:	major
[DESCRIPTION]
Added propagators for the circuit constraint.

[ENTRY]
Module:	kernel
What:	performance
Rank:	minor
[DESCRIPTION]
Improved automatic memory management on Windows platforms.

[ENTRY]
Module:	int
What:	performance
Rank:	minor
[DESCRIPTION]
Domain consistent distinct and channel allocate memory from the
space heap now. Much simpler.

[ENTRY]
Module:	int
What:	change
Rank:	minor
[DESCRIPTION]
The Boolean tell operations one_none and zero_none now also
return a ModEvent and hence must be checked for failure. This is
needed for simpler advisors.

[ENTRY]
Module:	kernel
What:	performance
Rank:	major
[DESCRIPTION]
The memory management policies have been completely reworked. Now
memory requests are much more regular. Hence, memory is much more
likely to be returned to the operating system. Furthermore, the
flush member functions for actors have been removed (they were
unneeded) and actors and spaces now have allocated member
functions for returning how much memory is allocated by a space.

Moreover, the memory reported by some propagators has been
ignored. Note that this flaw did not affect the benchmark figures
on the %Gecode webpage.

[ENTRY]
Module:	int
What:	performance
Rank:	minor
[DESCRIPTION]
The multiplication uses integer precision if possible for better
performance.

[ENTRY]
Module:	int
What:	change
Rank:	minor
[DESCRIPTION]
Integer and Boolean variables are now guaranteed to be
inspectable (that is, all const member functions work on them),
even though a space is failed. However, the variables might have
been modified during a tell operation that has failed.

[ENTRY]
Module:	minimodel
What:	change
Rank:	major
[DESCRIPTION]
Linear expressions and relations can also be created from Boolean
variables, with the restriction that Boolean relations cannot be
reified.

[ENTRY]
Module:	int
What:	change
Rank:	major
[DESCRIPTION]
Boolean variables (and hence Boolean views) do not any longer
share the implementation with integer variables. That has the
following consequences:
- Boolean variables are not any longer integer variables. The same
  holds true for arrays of variables.
- All constraints that make sense for both Boolean and integer
  variables have post functions that support both integer and
  Boolean variables.
- Memory for Boolean variables is reduced by 50% and performance
  increases in problems with many Boolean variables by up to 50%.

[ENTRY]
Module:	int
What:	new
Rank:	major
[DESCRIPTION]
Added propagators for linear constraints over Boolean variables,
in particular specialized and efficient versions for non-unit
coefficients.

[ENTRY]
Module:	int
What:	change
Rank:	minor
[DESCRIPTION]
The linear constraints are now more careful (that is, they will
use more efficient versions more often if it is safe) to
determine whether overflow occurs and which precision (integer or
double) should be chosen.

[ENTRY]
Module:	int
What:	change
Rank:	minor
[DESCRIPTION]
The element constraints now accept an additional offset argument.

[ENTRY]
Module:	set
What:	new
Rank:	minor
[DESCRIPTION]
Added selection and reified relation constraints with constant sets.

[ENTRY]
Module:	set
What:	change
Rank:	minor
[DESCRIPTION]
Slightly stronger inferences for the finite set sequence and selection
constraints.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
New example: the balanced academic curriculum problem (problem 030 from
CSPlib).

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed the n-ary partition propagator to handle overflow of the sum of
cardinalities correctly.

[ENTRY]
Module: kernel
What: 	bug
Rank: 	minor
[DESCRIPTION]
Subscription to constant views now should use the propagate
member function from a variable implementation: it guarantees
execution of a propagator at least once (int and set views have
been adopted accordingly).

[ENTRY]
Module: int
What: 	bug
Rank: 	major
Bug:	48
[DESCRIPTION]
Branching on maximum regret would always crash on non-range domains.

[ENTRY]
Module: set
What: 	change
Rank: 	minor
[DESCRIPTION]
The finite set selection propagators accept an additional
argument that specifies where the indexing should start. It
should make some models more natural to express, and helps in
porting code from other systems, such as Prolog or Mozart.  In
addition, the selectUnion propagator is now hand-written again,
resulting in better performance.

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
All Boolean constraints got a new and regular interface. Rather
than providing different post functions for the different
constraints, the single post function rel is used: the Boolean
operation then is described by a value of type BoolOpType. In
addition, all Boolean propagators have been reimplemented for
better performance and less memory use.

[ENTRY]
Module: test
What:   new
Rank:   minor
[DESCRIPTION]
Added simple testing for branchings.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The way how propagators report subsumption and partial fixpoints
has changed. Now, a propagator must first call dispose (which
then cancels subscriptions and possibly frees external resources)
and only then can return that the propagator is subsumed. For
that purpose a new function Gecode::ES_SUBSUMED has been
defined. Likewise, ES_FIX_PARTIAL and ES_NOFIX_PARTIAL are
functions rather than member functions of Gecode::Propagator. The
benefit is that this saves memory and is more efficient.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The use of the consistency options were a little confusing, now
the rule is: the level of consistency increases from ICL_VAL to
ICL_BND to ICL_DOM.

[ENTRY]
Module: minimodel
What:   performance
Rank:   minor
[DESCRIPTION]
Boolean expressions erroneously decomposed into ternary Boolean
constraints, while not incorrect rather inefficient for large
Boolean expressions.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Made all macros type safe.

[ENTRY]
Module: kernel
What:   new
Rank:   major
[DESCRIPTION]
Added macro GECODE_REWRITE for rewriting propagators. It is strongly advised
to always use this macro!

[ENTRY]
Module: example
What:   bug
Rank:   minor
Bug:    46
[DESCRIPTION]
Orientation of Sudokus now match the orientation in the specification-file.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
New example: MineSweeper.

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
New example: Domino.

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Set projectors could subscribe with bogus propagation conditions.

[ENTRY]
Module: set
What:   performance
Rank:   minor
[DESCRIPTION]
Performance of the tell operations on finite set variables was
improved.  Especially the intersect operation benefits from this.

[ENTRY]
Module: int
What:   new
Rank:   minor
[DESCRIPTION]
The element constraint now also supports integer values as result.

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Add a generic class for assignments during search (similar to
generic branchings for views and values).

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
All branching classes for value and view selection are now
parametric.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Boolean variables cannot longer be initialized from an integer
variable. If needed, a channel propagator must be posted (added).

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The equality constraints have been replaced by a variant of rel.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The propagator abstractions Inhom* have been renamed to Mix*.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
The operations t_one, t_one_none, t_zero, t_zero_none for Boolean
views have been renamed to one, one_none, zero, zero_none.

[ENTRY]
Module: kernel
What:   performance
Rank:   major
[DESCRIPTION]
Explicit disposal of actors has been reimplemented (the old
design was nothing but darn stupid). The memory overhead of
propagators is reduced by 40% for most propagators and 20% for
all. That is, a binary propagator takes 30% less memory and a
ternary propagator takes 25% less memory. Programs with many
binary or ternary propagators can run up to 20% faster.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
Propagators and branchings that require disposal when a space is
deleted must now be explicitly registered via a force function
and explicitly deregistered by an unforce function.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed memory leak in reified dom constraint.

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed memory leak in distinct constraint for sets.

[ENTRY]
Module: example
What:   new
Rank:   major
[DESCRIPTION]
New example: Pentominoes. The example uses extensional
constraints specified as regular expressions to place
irregular-shaped pieces on a board.



[RELEASE]
Version:	1.3.1
Date:		2006-10-25
[DESCRIPTION]
This is a minor release which fixes a major bug (the first real
serious bug). Please update as soon as possible.

[ENTRY]
Module: kernel
What:   bug
Rank:   major
Thanks: Rafael Meneses
[DESCRIPTION]
Branch&Bound search with ViewValBranchings (all standard branchings) together
with batch recomputation was severely broken. The problems ranged from wrong
search trees (missing solutions) to segmentation faults. The fix changes the
way assigned variables are removed from the array in a ViewValBranching.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Bounds-consistent distinct catches border case when an assigned variable
during bounds propagation leads to value removal for value propagation.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Bounds-consistent distinct eliminates assigned variables more
aggressively (can save up to 10% runtime in some cases).

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks:	Alejandro Arbelaez
[DESCRIPTION]
IntVar::init now also raises exceptions for illegal domain specifications.





[RELEASE]
Version:	1.3.0
Date:		2006-09-19
[DESCRIPTION]
This release adds a compiler for finite set projectors and provides new
infrastructure making it easier to add new variable domains. In addition,
it contains recent bug fixes and minor improvements.

[ENTRY]
Module: set
What:   new
Rank:   major
[DESCRIPTION]
Compiler for finite set projectors. Given a specification of a finite set
constraint as a projector set, it generates C++ code for the corresponding
propagator. Together with the dynamic propagator for finite set projectors,
this implements the backend of the technique described in the paper
"Generating Propagators for Finite Set Constraints" (Tack, Schulte,
Smolka; CP 2006.).

[ENTRY]
Module: other
What:   new
Rank:   minor
Thanks:	Jorge Marques Pelizzoni
[DESCRIPTION]
Also pass options for linking standard libraries for MSVC.

[ENTRY]
Module: other
What:   bug
Rank:   minor
[DESCRIPTION]
The pkg-config files now contain the correct path if you configured to the
default prefix (i.e. /usr/local).

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
Added aliases lex, atleast, atmost, and exactly for the count constraint.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Renamed lex constraint to rel (as it also supports equality and disequality).

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Make count constraints with integer number of equal occurrences
more incremental using dynamic subscriptions (gives a 20-30%
speedup).

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added an example for solving Black Hole patience games.

[ENTRY]
Module: kernel
What:   new
Rank:	major
[DESCRIPTION]
Subscription to variables now features an additional and optional
Boolean argument whether the propagator is to be processed. This
allows dynamically creation of subscriptions during propagation.

[ENTRY]
Module: other
What:   new
Rank:	minor
[DESCRIPTION]
New configure switches: --enable-audit to include audit code, which may
contain expensive checks of internal invariants or alternative, checked
implementations of critical parts of %Gecode. --enable-universal and
--with-sdk, to support building universal binaries on Mac OS X.

[ENTRY]
Module: kernel
What:	new
Rank:	minor
[DESCRIPTION]
Variables can now be deallocated when the Space is deallocated (for example in
case of failure). This is important in case a variable implementation needs to
reference external resources. Deallocation can be switched on in the
high-level description used for generating the variable implementation.

[ENTRY]
Module: minimodel
What:	bug
Rank:	minor
Thanks:	Rafael Meneses
[DESCRIPTION]
Under certain conditions (posting in a failed space), the post function
returned uninitialized variables.

[ENTRY]
Module: kernel
What: 	performance
Rank: 	major
[DESCRIPTION]
Variable implementations are now generated from a high-level
description (taking care of all aspects relating to modification
events and propagation conditions). While simplifying the
implementation of new variable domains considerably, this also can,
in lucky cases, deliver a speed-up of 5%.

[ENTRY]
Module: kernel
What: 	performance
Rank: 	major
[DESCRIPTION]
Allocate subscriptions in separate memory area. Can speedup execution
in some (but few) cases by up to 15-20%.

[ENTRY]
Module: int
What: 	documentation
Rank: 	minor
Bug:	43
[DESCRIPTION]
Fixed documentation problem due to doxygen...

[ENTRY]
Module: search
What: 	new
Rank: 	major
[DESCRIPTION]
Branch-and-bound search now interleaves recomputation with adding
bounding constraints. This can prune the search tree much
earlier: instead of recomputing many nodes from the same copy
node and then adding a constraint that fails all these nodes, it
might be possible to already fail the copy node directly. In
principle, the difference can be exponential, however for
examples we tried the effect is minor.

[ENTRY]
Module: kernel
What: 	bug
Rank: 	minor
[DESCRIPTION]
Now commits can be interleaved with adding new constraints during
batch recomputation. This also entails that commit does not raise
an exception when applied to an already failed space (it is
simply ignored). The bug could not be observed (unless you did
some very fancy search engines yourself) and one could actually
see it as an extension.




[RELEASE]
Version:	1.2.2
Date:		2006-07-25
[DESCRIPTION]
This release switches recomputation back on and removes some
experimental code that had sneaked into the system...

[ENTRY]
Module: kernel
What: 	performance
Rank: 	major
[DESCRIPTION]
Some experimental code had sneaked into the release, slowing down
the system by more than 10%...

[ENTRY]
Module: search
What: 	bug
Rank: 	major
[DESCRIPTION]
With the changes to search in %Gecode 1.2.1 recomputation was
actually almost switched off...

[ENTRY]
Module: int
What: 	performance
Rank: 	minor
[DESCRIPTION]
Improve performance of domain-consistent distinct (by providing
special ternary version). Can reduce runtime by 10-20% for some
examples.

[ENTRY]
Module: int
What: 	performance
Rank: 	minor
[DESCRIPTION]
Cut memory requirements for element (for integer arrays) by half.

[ENTRY]
Module: example
What: 	new
Rank: 	minor
[DESCRIPTION]
Added stress test for element constraint (originally due to Neng-Fa Zhou).

[ENTRY]
Module: example
What: 	new
Rank: 	minor
[DESCRIPTION]
Added stress test for min constraint.

[ENTRY]
Module: example
What: 	new
Rank: 	minor
[DESCRIPTION]
Added possibility to stop the search for solutions in examples based
on the time taken, the number of fails, or both.

[ENTRY]
Module: example
What: 	new
Rank: 	minor
[DESCRIPTION]
Added an example for solving Peacable co-existing armies of %Queens.



[RELEASE]
Version:	1.2.1
Date:		2006-07-19
[DESCRIPTION]
In addition to the usual fixes and improvements, the biggest
change is that all branchings now must support branching
descriptions. This also entails straightforward changes
(simplifications) to search-related space operations and to the
implementation of search engines.


[ENTRY]
Module: kernel
What: 	new
Rank: 	minor
[DESCRIPTION]
Added a macro GECODE_NEVER that assert that this command is never
executed.  This is preferred over assert(false) as it is used for
optimization, if supported by a compiler (for example, Microsoft
Visual C++).

[ENTRY]
Module: int
What: 	bug
Rank: 	minor
[DESCRIPTION]
Fixed fixpoint detection bug in n-ary min and max propagators.

[ENTRY]
Module: int
What: 	bug
Rank: 	minor
[DESCRIPTION]
Min and max propagators now correctly handle cases such as min(x,y)=x.

[ENTRY]
Module: int
What: 	removed
Rank: 	minor
[DESCRIPTION]
Removed bounds-consistent propagation for count constraint (not worth
the trouble, just use domain-consistent).

[ENTRY]
Module: kernel
What: 	change
Rank: 	minor
Thanks:	Martin Mann
[DESCRIPTION]
The ViewValBranching class now passes the home space to all member
functions used in selecting the view and the value.

[ENTRY]
Module: set
What: 	bug
Rank: 	minor
[DESCRIPTION]
Fixed fixpoint detection for n-ary partition propagator.

[ENTRY]
Module: set
What: 	new
Rank: 	major
[DESCRIPTION]
Added finite set projection propagators. They allow to propagate all
finite set constraints expressible as finite set projectors, including
negated and reified constraints.

[ENTRY]
Module: support
What:   new
Rank:   minor
[DESCRIPTION]
Added simple class encapsulating a linear congruential pseudo-random
number generator.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The interface for branchings has changed considerably, reflecting
the fact now that all branchings must support branching descriptions.
This is also reflected in the Space::status operation which has its
arguments reversed and corrected const qualifiers on its arguments.
But the good news is that it is considerably simpler than before.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Assignment branchings (that is, branchings with a single alternative)
could possibly take the wrong values for assignment during recomputation.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
The status operation does not any longer accept an argument for
the number of alternatives. The number of alternatives is now
available from a branching description (where it is passed upon
creation of the description). This reflects the fact that
branching descriptions are mandatory now.

[ENTRY]
Module: search
What:   bug
Rank:   major
[DESCRIPTION]
Fixed a serious bug where during recomputation the search stack
was always inspected behind the last element: the reason why
recomputation never crashed has been that stacks always keep one
element extra for optimization. So, serious bug but looks as if
no one stumbled over this...

[ENTRY]
Module: kernel
What:   bug
Rank:   minor
[DESCRIPTION]
As Boolean variables can be derived from integer variables, the
assumption that a not yet assigned Boolean variable can not be
modified is wrong.

[ENTRY]
Module: other
What:   documentation
Rank:   minor
[DESCRIPTION]
Generate one page per version released in changelog.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
Bug:	41
[DESCRIPTION]
Change exceptions thrown by %Gecode to be compliant with C++
exceptions.

[ENTRY]
Module: other
What:   bug
Rank:   minor
Bug:	42
[DESCRIPTION]
Renamed macros so as to avoid nameclashes (all macros start with
GECODE_).

[ENTRY]
Module: search
What:   bug
Rank:   minor
[DESCRIPTION]
Search engines now correctly count the number of propagation
steps including propagation that occurs when adaptive
recomputation creates additional clones.

[ENTRY]
Module: search
What:   change
Rank:   major
[DESCRIPTION]
Branchings now must return branching descriptions and commit
operations also insist on being provided with branching
descriptions.  This change reflects that batch recomputation is
of vital importance for efficiency in %Gecode.

[ENTRY]
Module: int
What:   performance
Rank:   major
[DESCRIPTION]
Make Boolean linear constraints with constant right hand sides
more incremental using dynamic subscriptions (gives a 20-30% speedup).

[ENTRY]
Module: minimodel
What:   performance
Rank:   minor
[DESCRIPTION]
Take advantage of specialized Boolean propagators in Boolean
expressions and relations.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Made n-ary Boolean conjunction and disjunction more incremental by
using dynamic subscriptions.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Provide special versions of Boolean propagators optimizing cases
where n-ary disjunctions are true.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Change implementation of Boolean propagators from conjunction
to disjunction so that disjunction can be used as special case
for Boolean sum with inequalities.


[RELEASE]
Version:	1.2.0
Date:		2006-06-20
[DESCRIPTION]
This release makes quite some drastic changes to how propagators
and branchings are deleted: instead of using destructors they use
a dispose method that allows passing a home space during deletion
(we will use this infrastructure measure to speed up cloning
considerably a little later). Moreover the directory structure
has changed on popular request so that all include files are to
be found in a gecode subdirectory. Apart from that, some small
fixes and extensions due to requests.

[ENTRY]
Module: set
What:   bug
Rank:   minor
Thanks: Luis Otero
[DESCRIPTION]
Fixed memory leak in finite set distinct propagator.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed memory leak in global cardinality constraint.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Martin Mann
[DESCRIPTION]
Fixed bug in equality tests that could lead to reified (dis)equality
propagators not achieving domain consistency.

[ENTRY]
Module: test
What:   new
Rank:   minor
[DESCRIPTION]
Added --enable-leak-debug configure option. This option causes the test suite
to call mtrace() under Linux, which can be used to test for memory leaks.

[ENTRY]
Module: kernel
What:   performance
Rank:   minor
[DESCRIPTION]
More aggressive inlining for canceling subscriptions.

[ENTRY]
Module: search
What:   bug
Rank:   minor
Bug:	39
[DESCRIPTION]
Fixed linkage of BAB destructor under Cygwin.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The branch member function for branchings now also takes a home space
as argument.

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
Canceling subscriptions on views and variable implementations now
require also a home space (this has become possible due to not using
destructors but ordinary "dispose" member functions).

[ENTRY]
Module: kernel
What:   change
Rank:   major
[DESCRIPTION]
Actors (propagators and branchings) do not any longer use destructors
but a "dispose" member function that takes a home space as argument
and must return the size of the actor.
Important: this requires that dispose member functions from super-classes
and class members are called explicitly!

[ENTRY]
Module: kernel
What:   new
Rank:   minor
[DESCRIPTION]
Spaces can be queried for number of propagators and branchings.

[ENTRY]
Module: search
What:   new
Rank:   minor
[DESCRIPTION]
Search engines can now be checked whether they have been stopped.

[ENTRY]
Module: int
What:   documentation
Rank:   minor
Thanks:	Martin Mann
[DESCRIPTION]
Fixed bug in description of PC_INT_DOM.

[ENTRY]
Module: other
What:   change
Rank:   major
Thanks:	Martin Mann
[DESCRIPTION]
Moved library source code into gecode subdirectory. Facilitates cleaner
installation. Programs compiling against %Gecode now need to include
e.g. "gecode/int.hh".

[ENTRY]
Module: example
What:   change
Rank:   minor
[DESCRIPTION]
Sudoku example generalized to arbitrarily sized Sudokus.

[RELEASE]
Version:	1.1.0
Date:		2006-04-10
[DESCRIPTION]
This minor release adds some new constraints (see below), adds support
for stopping search engines based on definable criteria, and some other
small fixes. Most notably, the test infrastructure has been extended to
also check whether propagators correctly claim that they have computed
a fixpoint (now all invariants a propagator must obey in %Gecode are covered
by the test infrastructure). This has lead to many small fixes.

[ENTRY]
Module: other
What:   bug
Bug:    37
Rank:   minor
Thanks: Kari Pahula
[DESCRIPTION]
Added a configure switch --enable-doc-dot. If enabled, this checks for
presence of the dot tool (used for generating graphs in the documentation)

[ENTRY]
Module: example
What:   new
Rank:   minor
[DESCRIPTION]
Added all-interval series using distinct.

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
Added functions returning variables for arithmetic
(min, max, abs, mult, plus, minus).

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Support for shared views has been removed in
sortedness propagator and in the propagator
for global cardinality with fixed cardinalities.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in fixpoint detection of sortedness and
global cardinality propagator.

[ENTRY]
Module: set
What:   bug
Rank:   minor
Bug:	36
Thanks: Javier Mena
[DESCRIPTION]
A non-debug version of %Gecode could not be linked to a program compiled with
assertions switched on, as BndSet::isConsistent was missing from the library.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Staged propagation for domain-consistent absolute value propagator

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
EqBnd and EqDom now take two template parameters for their view types. This
supports using different views, e.g. to express x0=-x1 using a MinusView.

[ENTRY]
Module: search
What:   new
Rank:   major
Thanks:	Rafael Meneses
[DESCRIPTION]
Added functionality to interrupt search engines (introduced
a Search::Stop class).

[ENTRY]
Module: search
What:   change
Rank:   major
[DESCRIPTION]
Removed search engines optimizing for copying only (after
all, one should always use some recomputation).

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in fixpoint detection of n-ary maximum/minimum
propagator.

[ENTRY]
Module: kernel
What:   change
Rank:   minor
[DESCRIPTION]
The status member function now also allows the first
argument to be optional.

[ENTRY]
Module: set
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bugs in fixpoint detection of several set propagators (match,
convexity, sequence, n-ary (disjoint) union).

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in fixpoint detection of bounds-consistent
element for variables propagator.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in fixpoint detection of bounds-consistent squaring
propagator (mult with the same variable twice).

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed bug in fixpoint detection of bounds-consistent abs
propagator.

[ENTRY]
Module: int
What:   performance
Rank:   minor
[DESCRIPTION]
Rewrite n-ary linear, min/max, and Boolean propagators to binary/ternary
variants during cloning if possible (saves memory).

[ENTRY]
Module: int
What:   bug
Rank:   minor
Thanks: Stefano Gualandi
[DESCRIPTION]
Fixed wrong assertion in gcc-bnd propagator.

[ENTRY]
Module: int
What:   bug
Rank:   major
Thanks: Jean-Christophe Godart
[DESCRIPTION]
Fixed indexing bug in SupportSet (part of the domain consistent linear
equation propagator).

[ENTRY]
Module: int
What:	new
Rank:	major
[DESCRIPTION]
Added new constraint channel for variable/value channeling
between two variable arrays.

[ENTRY]
Module: int
What:	change
Rank:	minor
[DESCRIPTION]
All distinct propagators raise an exception if a variable occurs
multiply in its arguments.

[ENTRY]
Module: set
What:	change
Rank:	major
[DESCRIPTION]
Renamed the set propagators minElement to min, maxElement to max,
and channelVarVal to channel.

[ENTRY]
Module: int
What: 	performance
Rank: 	major
[DESCRIPTION]
Improved initialization of domain-consistent distinct propagator,
in common cases for distinct this can save up to 10% runtime.

[ENTRY]
Module: set
What:	bug
Rank:	minor
Thanks: Patrick Pekczynski
[DESCRIPTION]
Fixed off-by-one bug in SetVarImp::lubMinN and SetVarImp::lubMaxN.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks: Olof Sivertsson
[DESCRIPTION]
(In-)Equations were still not correct with respect to the sign.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Bug:    33
Thanks: Olof Sivertsson
[DESCRIPTION]
Slice-operation now returns elements in right order.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Bug:    32
Thanks: Olof Sivertsson
[DESCRIPTION]
Possible array-out-of bounds access fixed for MiniModel::Matrix.

[ENTRY]
Module: example
What:   performance
Rank:   minor
[DESCRIPTION]
Added redundant constraint to social golfers example.




[RELEASE]
Version:	1.0.1
Date:		2006-03-01
[DESCRIPTION]
Maintenance release including some additions of domain-consistent
propagators and a fix for a serious bug in reified linear
inequalities.

[ENTRY]
Module: search
What:   change
Rank:   minor
[DESCRIPTION]
Changed default copying recomputation distance to 8.

[ENTRY]
Module: minimodel
What:   bug
Rank:   minor
Thanks: Olof Sivertsson
[DESCRIPTION]
(In-)Equations with an int on the left hand side (like 9==x) were
translated with a wrong sign (as -9==x).

[ENTRY]
Module: other
What:   bug
Rank:   minor
Bug:    31
[DESCRIPTION]
The preprocessor macro NDEBUG for disabling assertions is no longer
put into config.hpp. Without this fix, user programs could not use
assert if %Gecode was compiled with NDEBUG.

[ENTRY]
Module: minimodel
What:   new
Rank:   minor
[DESCRIPTION]
The post functions for linear expressions and relations also take
an integer consistency level as optional argument.

[ENTRY]
Module: int
What:   new
Rank:   major
[DESCRIPTION]
Added domain-consistent linear equalities.

[ENTRY]
Module: int
What:   bug
Rank:   minor
Bug:	30
[DESCRIPTION]
Fixed fixpoint detection for ternary min and max.

[ENTRY]
Module: int
What:   bug
Rank:   minor
[DESCRIPTION]
Fixed subsumption detection for regular with multiple variable occurrences.

[ENTRY]
Module: int
What:   change
Rank:   minor
[DESCRIPTION]
Cost computation for sortedness has been changed from static to
dynamic (taking into account the variable reduction the
propagator can perform).

[ENTRY]
Module: int
What:   change
Rank:   major
[DESCRIPTION]
Global cardinality changed to non-staged version.  Further
inference for cardinality variables added.  Parts of the graph
structure for the domain-consistent propagator have been revised
so as to avoid unnecessary propagation in case of fixed
cardinalities and to allow better staging for the
propagator. Revision of propagation for fixed cardinalities has
also been applied to bounds-consistent propagator.

[ENTRY]
Module:		int
What:		new
Rank:		major
[DESCRIPTION]
Added domain-consistent version of the absolute value propagator.

[ENTRY]
Module:		other
What:		performance
Rank:		major
[DESCRIPTION]
Switch assertions off in optimized builds with Microsoft's C++ compiler.

[ENTRY]
Module:		int
What:		bug
Rank:		major
Bug:		29
Thanks:		Dominik Brill
[DESCRIPTION]
Fixed a very serious bug in the reified linear inequality propagator.

[ENTRY]
Module:		other
What:		bug
Rank:		minor
Thanks:		Filip Konvicka
[DESCRIPTION]
Removed some compiler warnings for the Microsoft compiler with -W3.

[ENTRY]
Module:		int
What:		bug
Rank:		major
Bug:		27
[DESCRIPTION]
The strongly connected components represented by the permutation
variables in the extended version of Sortedness has been fixed
restoring bounds consistency on the permutation variables.

[ENTRY]
Module:		other
What:		change
Rank:		minor
Bug:		24
[DESCRIPTION]
The soname for libraries on Linux is now set properly, as well as the
version information on Darwin (Mac OS).

[ENTRY]
Module:		other
What:		change
Rank:		minor
Bug:		25
[DESCRIPTION]
The build system has been updated to support building both static and
shared libraries at the same time on Unix-like systems.

[ENTRY]
Module:		example
What:		change
Rank:		minor
[DESCRIPTION]
Examples now use per default the recomputation settings as
defined in the search module.

[RELEASE]
Version:	1.0.0
Date:		2005-12-06
[DESCRIPTION]
Initial release.