Jeff Thompson | a28eed8 | 2013-08-22 16:21:10 -0700 | [diff] [blame] | 1 | // Copyright 2005 Alexander Nasonov. |
| 2 | // Distributed under the Boost Software License, Version 1.0. (See |
| 3 | // accompanying file LICENSE_1_0.txt or copy at |
| 4 | // http://www.boost.org/LICENSE_1_0.txt) |
| 5 | |
| 6 | #ifndef FILE_boost_type_traits_integral_promotion_hpp_INCLUDED |
| 7 | #define FILE_boost_type_traits_integral_promotion_hpp_INCLUDED |
| 8 | |
| 9 | #include <ndnboost/config.hpp> |
| 10 | |
| 11 | #include <ndnboost/mpl/eval_if.hpp> |
| 12 | #include <ndnboost/mpl/identity.hpp> |
| 13 | #include <ndnboost/type_traits/integral_constant.hpp> |
| 14 | #include <ndnboost/type_traits/is_const.hpp> |
| 15 | #include <ndnboost/type_traits/is_enum.hpp> |
| 16 | #include <ndnboost/type_traits/is_volatile.hpp> |
| 17 | #include <ndnboost/type_traits/remove_cv.hpp> |
| 18 | |
| 19 | // Should be the last #include |
| 20 | #include <ndnboost/type_traits/detail/type_trait_def.hpp> |
| 21 | |
| 22 | namespace ndnboost { |
| 23 | |
| 24 | namespace type_traits { namespace detail { |
| 25 | |
| 26 | // 4.5/2 |
| 27 | template <class T> struct need_promotion : public ndnboost::is_enum<T> {}; |
| 28 | |
| 29 | // 4.5/1 |
| 30 | template<> struct need_promotion<char > : public true_type {}; |
| 31 | template<> struct need_promotion<signed char > : public true_type {}; |
| 32 | template<> struct need_promotion<unsigned char > : public true_type {}; |
| 33 | template<> struct need_promotion<signed short int > : public true_type {}; |
| 34 | template<> struct need_promotion<unsigned short int> : public true_type {}; |
| 35 | |
| 36 | |
| 37 | // Specializations for non-standard types. |
| 38 | // Type is promoted if it's smaller then int. |
| 39 | |
| 40 | #define BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(T) \ |
| 41 | template<> struct need_promotion<T> \ |
| 42 | : public integral_constant<bool, (sizeof(T) < sizeof(int))> {}; |
| 43 | |
| 44 | // Same set of integral types as in boost/type_traits/is_integral.hpp. |
| 45 | // Please, keep in sync. |
| 46 | #if (defined(BOOST_MSVC) && (BOOST_MSVC < 1300)) \ |
| 47 | || (defined(BOOST_INTEL_CXX_VERSION) && defined(_MSC_VER) && (BOOST_INTEL_CXX_VERSION <= 600)) \ |
| 48 | || (defined(__BORLANDC__) && (__BORLANDC__ == 0x600) && (_MSC_VER < 1300)) |
| 49 | // TODO: common macro for this #if. Or better yet, PP SEQ of non-standard types. |
| 50 | BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(__int8 ) |
| 51 | BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(unsigned __int8 ) |
| 52 | BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(__int16 ) |
| 53 | BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(unsigned __int16) |
| 54 | BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(__int32 ) |
| 55 | BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(unsigned __int32) |
| 56 | #ifdef __BORLANDC__ |
| 57 | BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(unsigned __int64) |
| 58 | BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE( __int64) |
| 59 | #endif |
| 60 | #endif |
| 61 | |
| 62 | #if defined(BOOST_HAS_LONG_LONG) |
| 63 | BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(ndnboost::ulong_long_type) |
| 64 | BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(ndnboost::long_long_type ) |
| 65 | #elif defined(BOOST_HAS_MS_INT64) |
| 66 | BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(unsigned __int64) |
| 67 | BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE( __int64) |
| 68 | #endif |
| 69 | |
| 70 | #undef BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE |
| 71 | |
| 72 | |
| 73 | #ifndef BOOST_NO_INTRINSIC_WCHAR_T |
| 74 | // 4.5/2 |
| 75 | template<> struct need_promotion<wchar_t> : public true_type {}; |
| 76 | #endif |
| 77 | |
| 78 | // 4.5/3 (integral bit-field) is not supported. |
| 79 | |
| 80 | // 4.5/4 |
| 81 | template<> struct need_promotion<bool> : public true_type {}; |
| 82 | |
| 83 | |
| 84 | // Get promoted type by index and cv qualifiers. |
| 85 | |
| 86 | template<int Index, int IsConst, int IsVolatile> struct promote_from_index; |
| 87 | |
| 88 | #define BOOST_TT_AUX_PROMOTE_FROM_INDEX(N,T) \ |
| 89 | template<> struct promote_from_index<N,0,0> { typedef T type; }; \ |
| 90 | template<> struct promote_from_index<N,0,1> { typedef T volatile type; }; \ |
| 91 | template<> struct promote_from_index<N,1,0> { typedef T const type; }; \ |
| 92 | template<> struct promote_from_index<N,1,1> { typedef T const volatile type; }; |
| 93 | |
| 94 | |
| 95 | BOOST_TT_AUX_PROMOTE_FROM_INDEX(1, int ) |
| 96 | BOOST_TT_AUX_PROMOTE_FROM_INDEX(2, unsigned int ) |
| 97 | BOOST_TT_AUX_PROMOTE_FROM_INDEX(3, long ) |
| 98 | BOOST_TT_AUX_PROMOTE_FROM_INDEX(4, unsigned long) |
| 99 | |
| 100 | |
| 101 | // WARNING: integral promotions to non-standard types |
| 102 | // long long and __int64 are not defined by the standard. |
| 103 | // Additional specialisations and overloads shouldn't |
| 104 | // introduce ambiguity, though. |
| 105 | |
| 106 | #if defined(BOOST_HAS_LONG_LONG) |
| 107 | BOOST_TT_AUX_PROMOTE_FROM_INDEX(5, ndnboost::long_long_type ) |
| 108 | BOOST_TT_AUX_PROMOTE_FROM_INDEX(6, ndnboost::ulong_long_type) |
| 109 | #elif defined(BOOST_HAS_MS_INT64) |
| 110 | BOOST_TT_AUX_PROMOTE_FROM_INDEX(7, __int64 ) |
| 111 | BOOST_TT_AUX_PROMOTE_FROM_INDEX(8, unsigned __int64) |
| 112 | #endif |
| 113 | |
| 114 | #undef BOOST_TT_AUX_PROMOTE_FROM_INDEX |
| 115 | |
| 116 | |
| 117 | // Define BOOST_TT_AUX_PROMOTED_INDEX_TESTER: |
| 118 | #if !defined(BOOST_MSVC) |
| 119 | |
| 120 | template<int N> |
| 121 | struct sized_type_for_promotion |
| 122 | { |
| 123 | typedef char (&type)[N]; |
| 124 | }; |
| 125 | |
| 126 | #define BOOST_TT_AUX_PROMOTED_INDEX_TESTER(I,T) \ |
| 127 | sized_type_for_promotion<I>::type promoted_index_tester(T); |
| 128 | |
| 129 | #else |
| 130 | |
| 131 | #define BOOST_TT_AUX_PROMOTED_INDEX_TESTER(I,T) \ |
| 132 | char (&promoted_index_tester(T))[I]; |
| 133 | |
| 134 | #endif |
| 135 | |
| 136 | BOOST_TT_AUX_PROMOTED_INDEX_TESTER(1, int ) |
| 137 | BOOST_TT_AUX_PROMOTED_INDEX_TESTER(2, unsigned int ) |
| 138 | BOOST_TT_AUX_PROMOTED_INDEX_TESTER(3, long ) |
| 139 | BOOST_TT_AUX_PROMOTED_INDEX_TESTER(4, unsigned long) |
| 140 | |
| 141 | #if defined(BOOST_HAS_LONG_LONG) |
| 142 | BOOST_TT_AUX_PROMOTED_INDEX_TESTER(5, ndnboost::long_long_type ) |
| 143 | BOOST_TT_AUX_PROMOTED_INDEX_TESTER(6, ndnboost::ulong_long_type) |
| 144 | #elif defined(BOOST_HAS_MS_INT64) |
| 145 | BOOST_TT_AUX_PROMOTED_INDEX_TESTER(7, __int64 ) |
| 146 | BOOST_TT_AUX_PROMOTED_INDEX_TESTER(8, unsigned __int64) |
| 147 | #endif |
| 148 | |
| 149 | #undef BOOST_TT_AUX_PROMOTED_INDEX_TESTER |
| 150 | |
| 151 | |
| 152 | // Get an index of promoted type for type T. |
| 153 | // Precondition: need_promotion<T> |
| 154 | template<class T> |
| 155 | struct promoted_index |
| 156 | { |
| 157 | static T testee; // undefined |
| 158 | BOOST_STATIC_CONSTANT(int, value = sizeof(promoted_index_tester(+testee)) ); |
| 159 | // Unary plus promotes testee LOOK HERE ---> ^ |
| 160 | }; |
| 161 | |
| 162 | template<class T> |
| 163 | struct integral_promotion_impl |
| 164 | { |
| 165 | typedef BOOST_DEDUCED_TYPENAME promote_from_index< |
| 166 | (ndnboost::type_traits::detail::promoted_index<T>::value) |
| 167 | , (ndnboost::is_const<T>::value) |
| 168 | , (ndnboost::is_volatile<T>::value) |
| 169 | >::type type; |
| 170 | }; |
| 171 | |
| 172 | template<class T> |
| 173 | struct integral_promotion |
| 174 | : public ndnboost::mpl::eval_if< |
| 175 | need_promotion<BOOST_DEDUCED_TYPENAME remove_cv<T>::type> |
| 176 | , integral_promotion_impl<T> |
| 177 | , ndnboost::mpl::identity<T> |
| 178 | > |
| 179 | { |
| 180 | }; |
| 181 | |
| 182 | } } |
| 183 | |
| 184 | BOOST_TT_AUX_TYPE_TRAIT_DEF1( |
| 185 | integral_promotion |
| 186 | , T |
| 187 | , BOOST_DEDUCED_TYPENAME |
| 188 | ndnboost::type_traits::detail::integral_promotion<T>::type |
| 189 | ) |
| 190 | } |
| 191 | |
| 192 | #include <ndnboost/type_traits/detail/type_trait_undef.hpp> |
| 193 | |
| 194 | #endif // #ifndef FILE_boost_type_traits_integral_promotion_hpp_INCLUDED |
| 195 | |