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2 | #ifndef BOOST_MPL_AUX_MSVC_IS_CLASS_HPP_INCLUDED |
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3 | #define BOOST_MPL_AUX_MSVC_IS_CLASS_HPP_INCLUDED |
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4 | |
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5 | // Copyright Aleksey Gurtovoy 2002-2004 |
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6 | // |
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7 | // Distributed under the Boost Software License, Version 1.0. |
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8 | // (See accompanying file LICENSE_1_0.txt or copy at |
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9 | // http://www.boost.org/LICENSE_1_0.txt) |
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10 | // |
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11 | // See http://www.boost.org/libs/mpl for documentation. |
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12 | |
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13 | // $Id: msvc_is_class.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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14 | // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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15 | // $Revision: 49267 $ |
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16 | |
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17 | #include <boost/mpl/if.hpp> |
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18 | #include <boost/mpl/bool.hpp> |
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19 | #include <boost/mpl/aux_/type_wrapper.hpp> |
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20 | #include <boost/mpl/aux_/yes_no.hpp> |
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21 | |
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22 | #include <boost/type_traits/is_reference.hpp> |
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23 | |
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24 | namespace boost { namespace mpl { namespace aux { |
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25 | |
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26 | template< typename T > struct is_class_helper |
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27 | { |
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28 | typedef int (T::* type)(); |
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29 | }; |
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30 | |
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31 | // MSVC 6.x-specific lightweight 'is_class' implementation; |
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32 | // Distinguishing feature: does not instantiate the type being tested. |
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33 | template< typename T > |
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34 | struct msvc_is_class_impl |
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35 | { |
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36 | template< typename U> |
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37 | static yes_tag test(type_wrapper<U>*, /*typename*/ is_class_helper<U>::type = 0); |
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38 | static no_tag test(void const volatile*, ...); |
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39 | |
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40 | enum { value = sizeof(test((type_wrapper<T>*)0)) == sizeof(yes_tag) }; |
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41 | typedef bool_<value> type; |
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42 | }; |
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43 | |
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44 | // agurt, 17/sep/04: have to check for 'is_reference' upfront to avoid ICEs in |
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45 | // complex metaprograms |
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46 | template< typename T > |
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47 | struct msvc_is_class |
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48 | : if_< |
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49 | is_reference<T> |
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50 | , false_ |
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51 | , msvc_is_class_impl<T> |
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52 | >::type |
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53 | { |
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54 | }; |
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55 | |
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56 | }}} |
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57 | |
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58 | #endif // BOOST_MPL_AUX_MSVC_IS_CLASS_HPP_INCLUDED |
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