using System;

using System.Collections.Generic;

using System.Linq;

​

namespace Example {

​

    public class Base {

        protected readonly List<int> m_values = new List<int>();

        public void SetParent (Base parent) {

            parent.m_values.Add(0);

        }

    }

}

public class Program 

{

    public static void Main() {

    }

}