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using System;
using System.Collections;
using System.Collections.Generic;
class Foo {}
class Bar : Foo {
public string Name { get; set; }
}
class Collection<T> : IEnumerable<T> where T : Foo {
List<T> list = new List<T> ();
public void Add (T t)
{
list.Add (t);
}
public IEnumerator<T> GetEnumerator ()
{
foreach (T t in list)
yield return t;
}
IEnumerator IEnumerable.GetEnumerator ()
{
return GetEnumerator ();
}
}
class BarCollection : Collection<Bar> {}
class Program {
public static int Main ()
{
var collection = new BarCollection () {
new Bar { Name = "a" },
new Bar { Name = "b" },
new Bar { Name = "c" },
};
foreach (var bar in collection)
Console.WriteLine (bar.Name);
return 0;
}
}
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