[boost] The new is_class doesn't work on VC 7.01 alpha

From: Peter Dimov (pdimov_at_[hidden])
Date: 2002-04-22 13:03:41

On VC 7.01 alpha, is_class<T> returns true for

T = void (__cdecl *)(ui::group_impl *,msg::endpoint *)

which causes is_empty (used in is_stateless) to try to derive from T; this
breaks boost::function.

I've temporarily changed the BOOST_MSVC > 1300 check in is_class.hpp and
composite_traits.hpp to BOOST_MSVC > 1301; this seems to work for now.

--
Peter Dimov
Multi Media Ltd.