[3408] | 1 | // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard |
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| 2 | // Hinnant & John Maddock 2000-2003. |
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| 3 | // Use, modification and distribution are subject to the Boost Software License, |
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| 4 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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| 5 | // http://www.boost.org/LICENSE_1_0.txt). |
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| 6 | // |
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| 7 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
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| 8 | |
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| 9 | |
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| 10 | #ifndef BOOST_TT_IS_CLASS_HPP_INCLUDED |
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| 11 | #define BOOST_TT_IS_CLASS_HPP_INCLUDED |
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| 12 | |
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| 13 | #include <boost/type_traits/config.hpp> |
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| 14 | #include <boost/type_traits/intrinsics.hpp> |
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| 15 | #ifndef BOOST_IS_CLASS |
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| 16 | # include <boost/type_traits/is_union.hpp> |
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| 17 | # include <boost/type_traits/detail/ice_and.hpp> |
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| 18 | # include <boost/type_traits/detail/ice_not.hpp> |
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| 19 | |
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| 20 | #ifdef BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION |
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| 21 | # include <boost/type_traits/detail/yes_no_type.hpp> |
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| 22 | #else |
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| 23 | # include <boost/type_traits/is_scalar.hpp> |
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| 24 | # include <boost/type_traits/is_array.hpp> |
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| 25 | # include <boost/type_traits/is_reference.hpp> |
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| 26 | # include <boost/type_traits/is_void.hpp> |
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| 27 | # include <boost/type_traits/is_function.hpp> |
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| 28 | #endif |
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| 29 | |
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| 30 | #endif // BOOST_IS_CLASS |
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| 31 | |
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| 32 | #ifdef __EDG_VERSION__ |
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| 33 | # include <boost/type_traits/remove_cv.hpp> |
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| 34 | #endif |
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| 35 | |
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| 36 | // should be the last #include |
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| 37 | #include <boost/type_traits/detail/bool_trait_def.hpp> |
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| 38 | |
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| 39 | namespace boost { |
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| 40 | |
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| 41 | namespace detail { |
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| 42 | |
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| 43 | #ifndef BOOST_IS_CLASS |
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| 44 | #ifdef BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION |
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| 45 | |
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| 46 | // This is actually the conforming implementation which works with |
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| 47 | // abstract classes. However, enough compilers have trouble with |
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| 48 | // it that most will use the one in |
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| 49 | // boost/type_traits/object_traits.hpp. This implementation |
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| 50 | // actually works with VC7.0, but other interactions seem to fail |
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| 51 | // when we use it. |
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| 52 | |
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| 53 | // is_class<> metafunction due to Paul Mensonides |
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| 54 | // (leavings@attbi.com). For more details: |
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| 55 | // http://groups.google.com/groups?hl=en&selm=000001c1cc83%24e154d5e0%247772e50c%40c161550a&rnum=1 |
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| 56 | #if defined(__GNUC__) && !defined(__EDG_VERSION__) |
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| 57 | |
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| 58 | template <class U> ::boost::type_traits::yes_type is_class_tester(void(U::*)(void)); |
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| 59 | template <class U> ::boost::type_traits::no_type is_class_tester(...); |
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| 60 | |
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| 61 | template <typename T> |
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| 62 | struct is_class_impl |
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| 63 | { |
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| 64 | |
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| 65 | BOOST_STATIC_CONSTANT(bool, value = |
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| 66 | (::boost::type_traits::ice_and< |
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| 67 | sizeof(is_class_tester<T>(0)) == sizeof(::boost::type_traits::yes_type), |
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| 68 | ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value |
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| 69 | >::value) |
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| 70 | ); |
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| 71 | }; |
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| 72 | |
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| 73 | #else |
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| 74 | |
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| 75 | template <typename T> |
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| 76 | struct is_class_impl |
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| 77 | { |
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| 78 | template <class U> static ::boost::type_traits::yes_type is_class_tester(void(U::*)(void)); |
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| 79 | template <class U> static ::boost::type_traits::no_type is_class_tester(...); |
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| 80 | |
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| 81 | BOOST_STATIC_CONSTANT(bool, value = |
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| 82 | (::boost::type_traits::ice_and< |
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| 83 | sizeof(is_class_tester<T>(0)) == sizeof(::boost::type_traits::yes_type), |
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| 84 | ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value |
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| 85 | >::value) |
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| 86 | ); |
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| 87 | }; |
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| 88 | |
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| 89 | #endif |
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| 90 | |
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| 91 | #else |
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| 92 | |
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| 93 | template <typename T> |
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| 94 | struct is_class_impl |
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| 95 | { |
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| 96 | # ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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| 97 | BOOST_STATIC_CONSTANT(bool, value = |
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| 98 | (::boost::type_traits::ice_and< |
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| 99 | ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value, |
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| 100 | ::boost::type_traits::ice_not< ::boost::is_scalar<T>::value >::value, |
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| 101 | ::boost::type_traits::ice_not< ::boost::is_array<T>::value >::value, |
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| 102 | ::boost::type_traits::ice_not< ::boost::is_reference<T>::value>::value, |
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| 103 | ::boost::type_traits::ice_not< ::boost::is_void<T>::value >::value, |
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| 104 | ::boost::type_traits::ice_not< ::boost::is_function<T>::value >::value |
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| 105 | >::value)); |
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| 106 | # else |
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| 107 | BOOST_STATIC_CONSTANT(bool, value = |
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| 108 | (::boost::type_traits::ice_and< |
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| 109 | ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value, |
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| 110 | ::boost::type_traits::ice_not< ::boost::is_scalar<T>::value >::value, |
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| 111 | ::boost::type_traits::ice_not< ::boost::is_array<T>::value >::value, |
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| 112 | ::boost::type_traits::ice_not< ::boost::is_reference<T>::value>::value, |
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| 113 | ::boost::type_traits::ice_not< ::boost::is_void<T>::value >::value |
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| 114 | >::value)); |
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| 115 | # endif |
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| 116 | }; |
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| 117 | |
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| 118 | # endif // BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION |
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| 119 | # else // BOOST_IS_CLASS |
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| 120 | template <typename T> |
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| 121 | struct is_class_impl |
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| 122 | { |
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| 123 | BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_CLASS(T)); |
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| 124 | }; |
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| 125 | # endif // BOOST_IS_CLASS |
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| 126 | |
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| 127 | } // namespace detail |
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| 128 | |
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| 129 | # ifdef __EDG_VERSION__ |
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| 130 | BOOST_TT_AUX_BOOL_TRAIT_DEF1( |
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| 131 | is_class,T, boost::detail::is_class_impl<typename boost::remove_cv<T>::type>::value) |
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| 132 | # else |
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| 133 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_class,T,::boost::detail::is_class_impl<T>::value) |
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| 134 | # endif |
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| 135 | |
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| 136 | } // namespace boost |
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| 137 | |
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| 138 | #include <boost/type_traits/detail/bool_trait_undef.hpp> |
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| 139 | |
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| 140 | #endif // BOOST_TT_IS_CLASS_HPP_INCLUDED |
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