[857] | 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/is_union.hpp"
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| 15 | # include "boost/type_traits/detail/ice_and.hpp"
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| 16 | # include "boost/type_traits/detail/ice_not.hpp"
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| 17 |
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| 18 | #ifdef BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION
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| 19 | # include "boost/type_traits/detail/yes_no_type.hpp"
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| 20 | #else
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| 21 | # include "boost/type_traits/is_scalar.hpp"
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| 22 | # include "boost/type_traits/is_array.hpp"
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| 23 | # include "boost/type_traits/is_reference.hpp"
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| 24 | # include "boost/type_traits/is_void.hpp"
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| 25 | # include "boost/type_traits/is_function.hpp"
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| 26 | #endif
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| 27 |
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| 28 | #ifdef __EDG_VERSION__
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| 29 | # include "boost/type_traits/remove_cv.hpp"
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| 30 | #endif
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| 31 |
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| 32 | // should be the last #include
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| 33 | #include "boost/type_traits/detail/bool_trait_def.hpp"
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| 34 |
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| 35 | namespace boost {
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| 36 |
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| 37 | namespace detail {
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| 38 |
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| 39 | #ifdef BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION
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| 40 |
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| 41 | // This is actually the conforming implementation which works with
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| 42 | // abstract classes. However, enough compilers have trouble with
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| 43 | // it that most will use the one in
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| 44 | // boost/type_traits/object_traits.hpp. This implementation
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| 45 | // actually works with VC7.0, but other interactions seem to fail
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| 46 | // when we use it.
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| 47 |
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| 48 | // is_class<> metafunction due to Paul Mensonides
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| 49 | // (leavings@attbi.com). For more details:
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| 50 | // http://groups.google.com/groups?hl=en&selm=000001c1cc83%24e154d5e0%247772e50c%40c161550a&rnum=1
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| 51 | #if defined(__GNUC__) && !defined(__EDG_VERSION__)
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| 52 |
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| 53 | template <class U> ::boost::type_traits::yes_type is_class_tester(void(U::*)(void));
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| 54 | template <class U> ::boost::type_traits::no_type is_class_tester(...);
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| 55 |
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| 56 | template <typename T>
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| 57 | struct is_class_impl
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| 58 | {
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| 59 |
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| 60 | BOOST_STATIC_CONSTANT(bool, value =
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| 61 | (::boost::type_traits::ice_and<
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| 62 | sizeof(is_class_tester<T>(0)) == sizeof(::boost::type_traits::yes_type),
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| 63 | ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value
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| 64 | >::value)
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| 65 | );
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| 66 | };
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| 67 |
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| 68 | #else
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| 69 |
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| 70 | template <typename T>
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| 71 | struct is_class_impl
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| 72 | {
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| 73 | template <class U> static ::boost::type_traits::yes_type is_class_tester(void(U::*)(void));
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| 74 | template <class U> static ::boost::type_traits::no_type is_class_tester(...);
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| 75 |
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| 76 | BOOST_STATIC_CONSTANT(bool, value =
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| 77 | (::boost::type_traits::ice_and<
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| 78 | sizeof(is_class_tester<T>(0)) == sizeof(::boost::type_traits::yes_type),
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| 79 | ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value
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| 80 | >::value)
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| 81 | );
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| 82 | };
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| 83 |
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| 84 | #endif
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| 85 |
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| 86 | #else
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| 87 |
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| 88 | template <typename T>
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| 89 | struct is_class_impl
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| 90 | {
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| 91 | # ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 92 | BOOST_STATIC_CONSTANT(bool, value =
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| 93 | (::boost::type_traits::ice_and<
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| 94 | ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value,
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| 95 | ::boost::type_traits::ice_not< ::boost::is_scalar<T>::value >::value,
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| 96 | ::boost::type_traits::ice_not< ::boost::is_array<T>::value >::value,
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| 97 | ::boost::type_traits::ice_not< ::boost::is_reference<T>::value>::value,
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| 98 | ::boost::type_traits::ice_not< ::boost::is_void<T>::value >::value,
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| 99 | ::boost::type_traits::ice_not< ::boost::is_function<T>::value >::value
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| 100 | >::value));
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| 101 | # else
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| 102 | BOOST_STATIC_CONSTANT(bool, value =
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| 103 | (::boost::type_traits::ice_and<
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| 104 | ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value,
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| 105 | ::boost::type_traits::ice_not< ::boost::is_scalar<T>::value >::value,
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| 106 | ::boost::type_traits::ice_not< ::boost::is_array<T>::value >::value,
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| 107 | ::boost::type_traits::ice_not< ::boost::is_reference<T>::value>::value,
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| 108 | ::boost::type_traits::ice_not< ::boost::is_void<T>::value >::value
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| 109 | >::value));
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| 110 | # endif
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| 111 | };
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| 112 |
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| 113 | # endif // BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION
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| 114 |
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| 115 | } // namespace detail
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| 116 |
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| 117 | # ifdef __EDG_VERSION__
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| 118 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(
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| 119 | is_class,T, detail::is_class_impl<typename remove_cv<T>::type>::value)
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| 120 | # else
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| 121 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_class,T,::boost::detail::is_class_impl<T>::value)
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| 122 | # endif
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| 123 |
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| 124 | } // namespace boost
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| 125 |
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| 126 | #include "boost/type_traits/detail/bool_trait_undef.hpp"
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| 127 |
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| 128 | #endif // BOOST_TT_IS_CLASS_HPP_INCLUDED
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