is_base_and_derived type trait added.

From: John Maddock (John_Maddock_at_[hidden])
Date: 2002-01-04 07:50:23

Guys,

As discussed a while ago (as part of the Loki discussion), an extra traits
class:

template <class Base, class Derived>
struct is_base_and_derived;

has been added.  The name is slightly different to the ones that were
discussed previously, but I hope it should be reasonable "obvious".

At the same time I've added:

template <class T>
struct has_nothrow_construct;
template <class T>
struct has_nothrow_copy;
template <class T>
struct has_nothrow_assign;

which mirror the has_trivial_XXX classes.

- John Maddock
http://ourworld.compuserve.com/homepages/john_maddock/