using System;

public class Obj

{

    private string _v;

    public string v{

        get

        {

            return _v;

        }

        set

        {

            _v = value;

        }

    }

    public Obj()

    {

        Console.WriteLine("Create");

    }

    static public bool operator false(Obj o)

    {

        Console.WriteLine("False called");

        return o ==null;

    }

    static public bool operator true(Obj o)

    {

        Console.WriteLine("True called");

        return o !=null;

    }

    static public Obj operator |(Obj left, Obj right)

    {

        if(left == null)

            return right;

        if (right == null)

            return left;

        return left;

    }

    static public Obj operator &(Obj left, Obj right)

    {

         if(left == null)

            return null;

        if (right == null)

            return null;

        return right;

    }

    public override string ToString()

    {

        return v;

    }

}

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(">>>");

        Console.WriteLine(new Obj(){v = "left"} || new Obj(){v = "right"});

        Console.WriteLine("===");

        Console.WriteLine(new Obj(){v = "left"} && new Obj(){v = "right"});

        Console.WriteLine("<<<");

    }

}