EnumerableInt32Select.cs

using BenchmarkDotNet.Attributes;
using com.tinyield;
using NetFabric.Hyperlinq;
using StructLinq;
using System.Linq;

namespace LinqBenchmarks.Enumerable.Int32
{
    public class EnumerableInt32Select: EnumerableInt32BenchmarkBase
    {
        [Benchmark(Baseline = true)]
        public int ForeachLoop()
        {
            var sum = 0;
            foreach (var item in source)
                sum += item * 2;
            return sum;
        }

        [Benchmark]
        public int Linq()
        {
            var sum = 0;
            foreach (var item in source.Select(item => item * 2))
                sum += item;
            return sum;
        }

        [Benchmark]
        public int LinqAF()
        {
            var sum = 0;
            foreach (var item in global::LinqAF.IEnumerableExtensionMethods.Select(source, item => item * 2))
                sum += item;
            return sum;
        }

        [Benchmark]
        public int StructLinq()
        {
            var sum = 0;
            foreach (var item in source
                .ToStructEnumerable()
                .Select(item => item * 2))
                sum += item;
            return sum;
        }

        [Benchmark]
        public int StructLinq_IFunction()
        {
            var sum = 0;
            var selector = new DoubleOfInt32();
            foreach (var item in source
                .ToStructEnumerable()
                .Select(ref selector, x => x, x => x))
                sum += item;
            return sum;
        }

        [Benchmark]
        public int Hyperlinq_Foreach()
        {
            var sum = 0;
            foreach (var item in source.AsValueEnumerable().Select(item => item * 2))
                sum += item;
            return sum;
        }

        [Benchmark]
        public int Hyperlinq_Foreach_IFunction()
        {
            var sum = 0;
            foreach (var item in source.AsValueEnumerable().Select<int, DoubleOfInt32>())
                sum += item;
            return sum;
        }

        [Benchmark]
        public int Tinyield()
        {
            var sum = 0;
            Query.FromEnumerable(source)
                .Map(i => i * 2)
                .Traverse(item => sum += item);
            return sum;
        }
    }
}