N3980: a more flexible way of hashing

[amallia]

The next version should have a more flexible way of hashing according to N3980, which @mavam started in topic/n3980.

This issue will help us discussing about it.

[mavam]

Thanks for opening this one up. I've actually completed the heavy lifting in a separate project:

https://github.com/vast-io/vast/tree/master/libvast/vast/concept/hashable

What remains is adjusting the hasher API.

[amallia]

Oh, this is cool!
This will allow to have any type hashable and so able to add to a BF.
From my understand currently only arithmetic types (and arrays or vector of them) and string are supported.

[mavam]

This will allow to have any type hashable and so able to add to a BF.

Exactly! It also decouples the hash algorithm implementation, so that we can use a variety of different algorithms in the future.