From: Peter Dimov (pdimov_at_[hidden])
Date: 2002-03-18 08:20:35
This post
http://groups.google.com/groups?selm=000001c1cc83%24e154d5e0%247772e50c%40c1
61550a
contains a clever is_class<> implementation based on the fact that void T::*
is only valid when T is a class.
The thread contains another gem, has_key_type<T>::value which is true only
when T has a nested type named key_type.
-- Peter Dimov Multi Media Ltd.