using System;

class Test{
	public struct Ref{
		public delegate int GetD<T>(T A);
		public delegate void SetD<T, VT>(ref T trg, VT val);
		public struct RefIn<T, VT>{
			public readonly GetD<T> Get;
			public readonly SetD<T, VT> Set;
			public RefIn(GetD<T> g, SetD<T, VT> s){
				Get = g;
				Set = s;
			}
		}
		public static RefIn<T, VT> Wrap<T, VT>(GetD<T> g, SetD<T, VT> s){
			return new RefIn<T, VT>(g, s);
		}
	}
	struct Hoge {
		public int A;
	}
	public static void Main(){
		Hoge trg = new Hoge();
		
		var wr = Ref.Wrap(
			(Hoge t) => t.A,
			(ref Hoge t, int v) => t.A = v
		);
		
		wr.Set(ref trg, 100);
		Console.Write( wr.Get(trg) );
	}
}