using System;
using System.Collections.Generic;
 
interface IA {
    Object vObj{get;} 
}
class A<T> : IA where T : struct { 
    public T v;
    public A(T v) { this.v = v; }
    public Object vObj { get { return v; } }
}
class B{
    public List<IA> ls = new List<IA>();
    public B(){
        ls.Add(new A<int>(10));
        ls.Add(new A<double>(1.5));
    }
}
class Test{
    static void Main(string[] args){
        B b = new B();
        foreach (IA a in b.ls){
            Console.WriteLine(a.GetType() + ":" + a.vObj);
        }
    }
}

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