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