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58 lines
1.6 KiB
58 lines
1.6 KiB
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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: msvc_is_class.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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// $Revision: 49267 $ |
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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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