using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TestShit
{
    class Program
    {
        static void Main(string[] args)
        {
            //Example arsa = Test<Example>.GetInstance(3);
            var a = Singleton<Example>.GetInstance(4);
            var f = Singleton<Example>.GetInstance(47);
            var news = new Example(57);

        }

        class Example
        {
            int a;
            public Example()
            {

            }
            public Example(int a)
            {
                this.a = a;
            }
        }

        class MyClass
        {

        }
        class Singleton<T> where T:new()
        {
            static T instance;
            public static T GetInstance()
            {
                if (instance == null)
                {
                    instance = (T)Activator.CreateInstance(typeof(T), null);
                }
                return instance;
            }
            public static T GetInstance(int a)
            {
                if (instance == null)
                {
                    instance = (T)Activator.CreateInstance(typeof(T), a);
                }
                return instance;
            }



        }
    }
}