using System.Diagnostics;

using System.Collections.Generic;

using System;

​

public class Program

{

    public readonly struct ProtocolVersion

    {

        public ProtocolVersion(byte major, byte minor)

        {

            Major = major;

            Minor = minor;

        }

​

        public readonly byte Major;

        public readonly byte Minor;

    }

    public static void ParseVersion(ProtocolVersion version) {}

    public static void ParseVersion(in ProtocolVersion version) {}

​

    public static int Main(string[] args)

    {

        var version = new ProtocolVersion(1, 1);

        const int Iterations = 100000000;

        Stopwatch sw = new Stopwatch();

        sw.Start();

        for(int i = 0; i < Iterations; ++i)

        {

            ParseVersion(in version);

        }

        sw.Stop();

        Console.WriteLine("pass with in modifier={0}",sw.ElapsedMilliseconds);

        sw.Restart();

        for(int i = 0; i < Iterations; ++i)

        {

            ParseVersion(version);

        }

        sw.Stop();

        sw.Stop();

        Console.WriteLine("pass by value={0}",sw.ElapsedMilliseconds);

​

        return 0;

    }

}