[44] | 1 | |
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| 2 | // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard |
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| 3 | // Hinnant & John Maddock 2000. |
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| 4 | // Use, modification and distribution are subject to the Boost Software License, |
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| 5 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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| 6 | // http://www.boost.org/LICENSE_1_0.txt). |
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| 7 | // |
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| 8 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
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| 9 | |
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| 10 | |
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| 11 | #ifndef BOOST_TT_IS_ENUM_HPP_INCLUDED |
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| 12 | #define BOOST_TT_IS_ENUM_HPP_INCLUDED |
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| 13 | |
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| 14 | #include <boost/type_traits/intrinsics.hpp> |
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| 15 | #ifndef BOOST_IS_ENUM |
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| 16 | #include <boost/type_traits/add_reference.hpp> |
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| 17 | #include <boost/type_traits/is_arithmetic.hpp> |
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| 18 | #include <boost/type_traits/is_reference.hpp> |
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| 19 | #include <boost/type_traits/is_convertible.hpp> |
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| 20 | #include <boost/type_traits/is_array.hpp> |
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| 21 | #ifdef __GNUC__ |
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| 22 | #include <boost/type_traits/is_function.hpp> |
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| 23 | #endif |
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| 24 | #include <boost/type_traits/config.hpp> |
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| 25 | #if defined(BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION) |
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| 26 | # include <boost/type_traits/is_class.hpp> |
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| 27 | # include <boost/type_traits/is_union.hpp> |
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| 28 | #endif |
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| 29 | #endif |
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| 30 | |
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| 31 | // should be the last #include |
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| 32 | #include <boost/type_traits/detail/bool_trait_def.hpp> |
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| 33 | |
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| 34 | namespace boost { |
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| 35 | |
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| 36 | #ifndef BOOST_IS_ENUM |
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| 37 | #if !(defined(__BORLANDC__) && (__BORLANDC__ <= 0x551)) |
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| 38 | |
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| 39 | namespace detail { |
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| 40 | |
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| 41 | #if defined(BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION) |
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| 42 | |
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| 43 | template <typename T> |
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| 44 | struct is_class_or_union |
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| 45 | { |
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| 46 | BOOST_STATIC_CONSTANT(bool, value = |
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| 47 | (::boost::type_traits::ice_or< |
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| 48 | ::boost::is_class<T>::value |
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| 49 | , ::boost::is_union<T>::value |
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| 50 | >::value)); |
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| 51 | }; |
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| 52 | |
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| 53 | #else |
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| 54 | |
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| 55 | template <typename T> |
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| 56 | struct is_class_or_union |
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| 57 | { |
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| 58 | # if BOOST_WORKAROUND(BOOST_MSVC, < 1300) || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x581))// we simply can't detect it this way. |
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| 59 | BOOST_STATIC_CONSTANT(bool, value = false); |
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| 60 | # else |
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| 61 | template <class U> static ::boost::type_traits::yes_type is_class_or_union_tester(void(U::*)(void)); |
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| 62 | |
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| 63 | # if BOOST_WORKAROUND(BOOST_MSVC, == 1300) \ |
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| 64 | || BOOST_WORKAROUND(__MWERKS__, <= 0x3000) // no SFINAE |
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| 65 | static ::boost::type_traits::no_type is_class_or_union_tester(...); |
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| 66 | BOOST_STATIC_CONSTANT( |
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| 67 | bool, value = sizeof(is_class_or_union_tester(0)) == sizeof(::boost::type_traits::yes_type)); |
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| 68 | # else |
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| 69 | template <class U> |
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| 70 | static ::boost::type_traits::no_type is_class_or_union_tester(...); |
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| 71 | BOOST_STATIC_CONSTANT( |
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| 72 | bool, value = sizeof(is_class_or_union_tester<T>(0)) == sizeof(::boost::type_traits::yes_type)); |
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| 73 | # endif |
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| 74 | # endif |
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| 75 | }; |
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| 76 | #endif |
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| 77 | |
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| 78 | struct int_convertible |
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| 79 | { |
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| 80 | int_convertible(int); |
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| 81 | }; |
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| 82 | |
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| 83 | // Don't evaluate convertibility to int_convertible unless the type |
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| 84 | // is non-arithmetic. This suppresses warnings with GCC. |
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| 85 | template <bool is_typename_arithmetic_or_reference = true> |
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| 86 | struct is_enum_helper |
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| 87 | { |
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| 88 | template <typename T> struct type |
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| 89 | { |
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| 90 | BOOST_STATIC_CONSTANT(bool, value = false); |
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| 91 | }; |
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| 92 | }; |
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| 93 | |
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| 94 | template <> |
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| 95 | struct is_enum_helper<false> |
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| 96 | { |
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| 97 | template <typename T> struct type |
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| 98 | : ::boost::is_convertible<typename boost::add_reference<T>::type,::boost::detail::int_convertible> |
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| 99 | { |
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| 100 | }; |
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| 101 | }; |
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| 102 | |
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| 103 | template <typename T> struct is_enum_impl |
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| 104 | { |
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| 105 | //typedef ::boost::add_reference<T> ar_t; |
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| 106 | //typedef typename ar_t::type r_type; |
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| 107 | |
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| 108 | #if defined(__GNUC__) |
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| 109 | |
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| 110 | #ifdef BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION |
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| 111 | |
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| 112 | // We MUST check for is_class_or_union on conforming compilers in |
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| 113 | // order to correctly deduce that noncopyable types are not enums |
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| 114 | // (dwa 2002/04/15)... |
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| 115 | BOOST_STATIC_CONSTANT(bool, selector = |
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| 116 | (::boost::type_traits::ice_or< |
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| 117 | ::boost::is_arithmetic<T>::value |
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| 118 | , ::boost::is_reference<T>::value |
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| 119 | , ::boost::is_function<T>::value |
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| 120 | , is_class_or_union<T>::value |
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| 121 | , is_array<T>::value |
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| 122 | >::value)); |
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| 123 | #else |
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| 124 | // ...however, not checking is_class_or_union on non-conforming |
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| 125 | // compilers prevents a dependency recursion. |
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| 126 | BOOST_STATIC_CONSTANT(bool, selector = |
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| 127 | (::boost::type_traits::ice_or< |
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| 128 | ::boost::is_arithmetic<T>::value |
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| 129 | , ::boost::is_reference<T>::value |
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| 130 | , ::boost::is_function<T>::value |
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| 131 | , is_array<T>::value |
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| 132 | >::value)); |
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| 133 | #endif // BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION |
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| 134 | |
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| 135 | #else // !defined(__GNUC__): |
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| 136 | |
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| 137 | BOOST_STATIC_CONSTANT(bool, selector = |
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| 138 | (::boost::type_traits::ice_or< |
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| 139 | ::boost::is_arithmetic<T>::value |
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| 140 | , ::boost::is_reference<T>::value |
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| 141 | , is_class_or_union<T>::value |
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| 142 | , is_array<T>::value |
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| 143 | >::value)); |
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| 144 | |
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| 145 | #endif |
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| 146 | |
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| 147 | #if BOOST_WORKAROUND(__BORLANDC__, < 0x600) |
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| 148 | typedef ::boost::detail::is_enum_helper< |
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| 149 | ::boost::detail::is_enum_impl<T>::selector |
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| 150 | > se_t; |
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| 151 | #else |
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| 152 | typedef ::boost::detail::is_enum_helper<selector> se_t; |
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| 153 | #endif |
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| 154 | |
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| 155 | typedef typename se_t::template type<T> helper; |
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| 156 | BOOST_STATIC_CONSTANT(bool, value = helper::value); |
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| 157 | }; |
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| 158 | |
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| 159 | // these help on compilers with no partial specialization support: |
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| 160 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_enum,void,false) |
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| 161 | #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS |
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| 162 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_enum,void const,false) |
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| 163 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_enum,void volatile,false) |
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| 164 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_enum,void const volatile,false) |
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| 165 | #endif |
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| 166 | |
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| 167 | } // namespace detail |
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| 168 | |
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| 169 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_enum,T,::boost::detail::is_enum_impl<T>::value) |
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| 170 | |
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| 171 | #else // __BORLANDC__ |
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| 172 | // |
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| 173 | // buggy is_convertible prevents working |
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| 174 | // implementation of is_enum: |
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| 175 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_enum,T,false) |
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| 176 | |
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| 177 | #endif |
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| 178 | |
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| 179 | #else // BOOST_IS_ENUM |
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| 180 | |
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| 181 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_enum,T,BOOST_IS_ENUM(T)) |
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| 182 | |
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| 183 | #endif |
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| 184 | |
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| 185 | } // namespace boost |
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| 186 | |
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| 187 | #include <boost/type_traits/detail/bool_trait_undef.hpp> |
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| 188 | |
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| 189 | #endif // BOOST_TT_IS_ENUM_HPP_INCLUDED |
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