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+
+#ifndef BOOST_MPL_AUX_MSVC_IS_CLASS_HPP_INCLUDED
+#define BOOST_MPL_AUX_MSVC_IS_CLASS_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2002-2004
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/mpl for documentation.
+
+// $Id: msvc_is_class.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
+// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
+// $Revision: 49267 $
+
+#include <cutl/details/boost/mpl/if.hpp>
+#include <cutl/details/boost/mpl/bool.hpp>
+#include <cutl/details/boost/mpl/aux_/type_wrapper.hpp>
+#include <cutl/details/boost/mpl/aux_/yes_no.hpp>
+
+#include <cutl/details/boost/type_traits/is_reference.hpp>
+
+namespace cutl_details_boost { namespace mpl { namespace aux {
+
+template< typename T > struct is_class_helper
+{
+ typedef int (T::* type)();
+};
+
+// MSVC 6.x-specific lightweight 'is_class' implementation;
+// Distinguishing feature: does not instantiate the type being tested.
+template< typename T >
+struct msvc_is_class_impl
+{
+ template< typename U>
+ static yes_tag test(type_wrapper<U>*, /*typename*/ is_class_helper<U>::type = 0);
+ static no_tag test(void const volatile*, ...);
+
+ enum { value = sizeof(test((type_wrapper<T>*)0)) == sizeof(yes_tag) };
+ typedef bool_<value> type;
+};
+
+// agurt, 17/sep/04: have to check for 'is_reference' upfront to avoid ICEs in
+// complex metaprograms
+template< typename T >
+struct msvc_is_class
+ : if_<
+ is_reference<T>
+ , false_
+ , msvc_is_class_impl<T>
+ >::type
+{
+};
+
+}}}
+
+#endif // BOOST_MPL_AUX_MSVC_IS_CLASS_HPP_INCLUDED