Chris@16: 
Chris@16: #ifndef BOOST_MPL_AUX_MSVC_IS_CLASS_HPP_INCLUDED
Chris@16: #define BOOST_MPL_AUX_MSVC_IS_CLASS_HPP_INCLUDED
Chris@16: 
Chris@16: // Copyright Aleksey Gurtovoy 2002-2004
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. 
Chris@16: // (See accompanying file LICENSE_1_0.txt or copy at 
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // See http://www.boost.org/libs/mpl for documentation.
Chris@16: 
Chris@101: // $Id$
Chris@101: // $Date$
Chris@101: // $Revision$
Chris@16: 
Chris@16: #include <boost/mpl/if.hpp>
Chris@16: #include <boost/mpl/bool.hpp>
Chris@16: #include <boost/mpl/aux_/type_wrapper.hpp>
Chris@16: #include <boost/mpl/aux_/yes_no.hpp>
Chris@16: 
Chris@16: #include <boost/type_traits/is_reference.hpp>
Chris@16: 
Chris@16: namespace boost { namespace mpl { namespace aux {
Chris@16: 
Chris@16: template< typename T > struct is_class_helper
Chris@16: {
Chris@16:     typedef int (T::* type)();
Chris@16: };
Chris@16: 
Chris@16: // MSVC 6.x-specific lightweight 'is_class' implementation; 
Chris@16: // Distinguishing feature: does not instantiate the type being tested.
Chris@16: template< typename T >
Chris@16: struct msvc_is_class_impl
Chris@16: {
Chris@16:     template< typename U>
Chris@16:     static yes_tag  test(type_wrapper<U>*, /*typename*/ is_class_helper<U>::type = 0);
Chris@16:     static no_tag   test(void const volatile*, ...);
Chris@16: 
Chris@16:     enum { value = sizeof(test((type_wrapper<T>*)0)) == sizeof(yes_tag) };
Chris@16:     typedef bool_<value> type;
Chris@16: };
Chris@16: 
Chris@16: // agurt, 17/sep/04: have to check for 'is_reference' upfront to avoid ICEs in
Chris@16: // complex metaprograms
Chris@16: template< typename T >
Chris@16: struct msvc_is_class
Chris@16:     : if_<
Chris@16:           is_reference<T>
Chris@16:         , false_
Chris@16:         , msvc_is_class_impl<T>
Chris@16:         >::type
Chris@16: {
Chris@16: };
Chris@16: 
Chris@16: }}}
Chris@16: 
Chris@16: #endif // BOOST_MPL_AUX_MSVC_IS_CLASS_HPP_INCLUDED