FunctionPointers

FunctionPointers as common delegates replacement

Benchmark between Action delegate and ActionPointer struct

BenchmarkDotNet=v0.12.1, OS=Windows 10.0.19041.630 (2004/?/20H1)
Intel Core i7-1068NG7 CPU 2.30GHz, 1 CPU, 2 logical and 2 physical cores
.NET Core SDK=5.0.100
  [Host]     : .NET Core 3.1.9 (CoreCLR 4.700.20.47201, CoreFX 4.700.20.47203), X64 RyuJIT
  DefaultJob : .NET Core 3.1.9 (CoreCLR 4.700.20.47201, CoreFX 4.700.20.47203), X64 RyuJIT

Method	Mean	Error	StdDev	Gen 0	Gen 1	Gen 2	Allocated
CreateNewDelegate	226.3956 ns	1.0971 ns	0.9161 ns	0.0153	-	-	64 B
CreateNewActionPointer	15.1463 ns	0.0810 ns	0.0758 ns	-	-	-	-
DelegateBenchmark	1.7033 ns	0.0221 ns	0.0207 ns	-	-	-	-
FunctionPointerBenchmark	0.8401 ns	0.0106 ns	0.0099 ns	-	-	-	-

Benchmark between Action{object} delegate and ActionPointer{object} struct

BenchmarkDotNet=v0.12.1, OS=Windows 10.0.19041.630 (2004/?/20H1)
Intel Core i7-1068NG7 CPU 2.30GHz, 1 CPU, 2 logical and 2 physical cores
.NET Core SDK=5.0.100
  [Host]     : .NET Core 3.1.9 (CoreCLR 4.700.20.47201, CoreFX 4.700.20.47203), X64 RyuJIT
  DefaultJob : .NET Core 3.1.9 (CoreCLR 4.700.20.47201, CoreFX 4.700.20.47203), X64 RyuJIT

Method	Mean	Error	StdDev	Gen 0	Gen 1	Gen 2	Allocated
CreateNewDelegate	294.1316 ns	0.8335 ns	0.7389 ns	0.0153	-	-	64 B
CreateNewActionPointer	15.3587 ns	0.0804 ns	0.0752 ns	-	-	-	-
DelegateBenchmark	1.4036 ns	0.0062 ns	0.0049 ns	-	-	-	-
FunctionPointerBenchmark	0.8367 ns	0.0125 ns	0.0111 ns	-	-	-	-

Benchmark code:


    [MemoryDiagnoser]
    public class BenchFunction
    {
        private static MethodInfo mInfo;
        private static Action actionDelegate;
        private static ActionPointer actionPointer;

        static BenchFunction()
        {
            mInfo = typeof(BenchFunction).GetMethod(nameof(TargetMethod));

            actionDelegate = (Action)mInfo.CreateDelegate(typeof(Action));
            actionPointer = new ActionPointer(mInfo);
        }

        [Benchmark]
        public Action CreateNewDelegate()
        {
            return (Action)mInfo.CreateDelegate(typeof(Action));
        }

        [Benchmark]
        public ActionPointer CreateNewActionPointer()
        {
            return new ActionPointer(mInfo);
        }

        [Benchmark]

        public void DelegateBenchmark()
        {
            actionDelegate();
        }

        [Benchmark]
        public void FunctionPointerBenchmark()
        {
            actionPointer.Invoke();
        }

        public static void TargetMethod() { }
    }