Type-based stack

gistfile1.cs

class TypeStack {
  public void push(T obj);
  public T pop<T>();
  public T peek<T>();
}

var stack = new TypeStack();
stack.push("hello");
var o = new OtherType();
stack.push(o);
AssertSame(o, stack.peek<typeof OtherType>());

Doing the pop trick was something that I didn't use a lot, but when I needed it, sure came in handy.