BenchmarkVTPattern

BenchmarkVTPattern.cs

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using System;

namespace BenchmarkVTPattern
{
    [CoreJob]
    [MemoryDiagnoser]
    public class Benchmark
    {
        private object t1 = ValueTuple.Create(50, 50);
        private object t2 = ValueTuple.Create<object, object>(50, 50);



        [Benchmark]
        public int MatchArityOnly()
        {
            if (t1 is (_, _))
            {
                return 1;
            }
            return 0;
        }

        [Benchmark]
        public int MatchValueTuple()
        {
            if (t1 is ValueTuple<int, int> tuple)
            {
                return tuple.Item1 + tuple.Item2;
            }
            return 0;
        }

        [Benchmark]
        public int MatchValueTupleAndDeconstruct()
        {
            if (t1 is ValueTuple<int, int>(int x, int y))
            {
                return x + y;
            }
            return 0;
        }

        [Benchmark]
        public int MatchITuple()
        {
            if (t1 is (int x, int y))
            {
                return x + y;
            }
            return 0;
        }

        [Benchmark]
        public int MatchITuplePartially()
        {
            if (t1 is (int x, _))
            {
                return x;
            }
            return 0;
        }

        [Benchmark]
        public int MatchITupleInexact()
        {
            if (t2 is (int x, int y))
            {
                return x + y;
            }
            return 0;
        }

        [Benchmark]
        public int MatchValueTupleWithITupleFallback()
        {
            if (t2 is ValueTuple<int, int>(int x, int y))
            {
                return x + y;
            }
            else if (t2 is (int x2, int y2))
            {
                return x2 + y2;
            }
            return 0;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            BenchmarkRunner.Run<Benchmark>();
        }
    }
}