using System;

using System.Diagnostics;

public class Program

{

    public interface IDo

    {

        void Do();

    }

    struct TestStruct : IDo

    {

        int val;

        public void Do()

        {

            val++;

        }

    }

    class TestClass : IDo

    {

        int val;

        public void Do()

        {

            val++;

        }

    }

    const int Size = 3000 * 100;

​

    public static double Test<T>() where T: IDo, new()

    {

        var arr = new T[Size];

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

            arr[i] = new T();

        Stopwatch stp = Stopwatch.StartNew();

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

            arr[i].Do();

        return stp.ElapsedMilliseconds;

    }

    public static void Main()

    {

        Console.WriteLine("Test class {0}", Test<TestClass>());

        Console.WriteLine("Test struct {0}", Test<TestStruct>());

        Console.WriteLine("Finish");

    }

}