| // Copyright 2005 Alexander Nasonov. |
| // Distributed under the Boost Software License, Version 1.0. (See |
| // accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| |
| #ifndef FILE_boost_type_traits_integral_promotion_hpp_INCLUDED |
| #define FILE_boost_type_traits_integral_promotion_hpp_INCLUDED |
| |
| #include <boost/config.hpp> |
| |
| #include <boost/mpl/eval_if.hpp> |
| #include <boost/mpl/identity.hpp> |
| #include <boost/type_traits/integral_constant.hpp> |
| #include <boost/type_traits/is_const.hpp> |
| #include <boost/type_traits/is_enum.hpp> |
| #include <boost/type_traits/is_volatile.hpp> |
| #include <boost/type_traits/remove_cv.hpp> |
| |
| // Should be the last #include |
| #include <boost/type_traits/detail/type_trait_def.hpp> |
| |
| namespace boost { |
| |
| namespace type_traits { namespace detail { |
| |
| // 4.5/2 |
| template <class T> struct need_promotion : public boost::is_enum<T> {}; |
| |
| // 4.5/1 |
| template<> struct need_promotion<char > : public true_type {}; |
| template<> struct need_promotion<signed char > : public true_type {}; |
| template<> struct need_promotion<unsigned char > : public true_type {}; |
| template<> struct need_promotion<signed short int > : public true_type {}; |
| template<> struct need_promotion<unsigned short int> : public true_type {}; |
| |
| |
| // Specializations for non-standard types. |
| // Type is promoted if it's smaller then int. |
| |
| #define BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(T) \ |
| template<> struct need_promotion<T> \ |
| : public integral_constant<bool, (sizeof(T) < sizeof(int))> {}; |
| |
| // Same set of integral types as in boost/type_traits/is_integral.hpp. |
| // Please, keep in sync. |
| #if (defined(BOOST_INTEL_CXX_VERSION) && defined(_MSC_VER) && (BOOST_INTEL_CXX_VERSION <= 600)) \ |
| || (defined(__BORLANDC__) && (__BORLANDC__ == 0x600) && (_MSC_VER < 1300)) |
| // TODO: common macro for this #if. Or better yet, PP SEQ of non-standard types. |
| BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(__int8 ) |
| BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(unsigned __int8 ) |
| BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(__int16 ) |
| BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(unsigned __int16) |
| BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(__int32 ) |
| BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(unsigned __int32) |
| #ifdef __BORLANDC__ |
| BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(unsigned __int64) |
| BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE( __int64) |
| #endif |
| #endif |
| |
| #if defined(BOOST_HAS_LONG_LONG) |
| BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(boost::ulong_long_type) |
| BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(boost::long_long_type ) |
| #elif defined(BOOST_HAS_MS_INT64) |
| BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(unsigned __int64) |
| BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE( __int64) |
| #endif |
| |
| #undef BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE |
| |
| |
| #ifndef BOOST_NO_INTRINSIC_WCHAR_T |
| // 4.5/2 |
| template<> struct need_promotion<wchar_t> : public true_type {}; |
| #endif |
| |
| // 4.5/3 (integral bit-field) is not supported. |
| |
| // 4.5/4 |
| template<> struct need_promotion<bool> : public true_type {}; |
| |
| |
| // Get promoted type by index and cv qualifiers. |
| |
| template<int Index, int IsConst, int IsVolatile> struct promote_from_index; |
| |
| #define BOOST_TT_AUX_PROMOTE_FROM_INDEX(N,T) \ |
| template<> struct promote_from_index<N,0,0> { typedef T type; }; \ |
| template<> struct promote_from_index<N,0,1> { typedef T volatile type; }; \ |
| template<> struct promote_from_index<N,1,0> { typedef T const type; }; \ |
| template<> struct promote_from_index<N,1,1> { typedef T const volatile type; }; |
| |
| |
| BOOST_TT_AUX_PROMOTE_FROM_INDEX(1, int ) |
| BOOST_TT_AUX_PROMOTE_FROM_INDEX(2, unsigned int ) |
| BOOST_TT_AUX_PROMOTE_FROM_INDEX(3, long ) |
| BOOST_TT_AUX_PROMOTE_FROM_INDEX(4, unsigned long) |
| |
| |
| // WARNING: integral promotions to non-standard types |
| // long long and __int64 are not defined by the standard. |
| // Additional specialisations and overloads shouldn't |
| // introduce ambiguity, though. |
| |
| #if defined(BOOST_HAS_LONG_LONG) |
| BOOST_TT_AUX_PROMOTE_FROM_INDEX(5, boost::long_long_type ) |
| BOOST_TT_AUX_PROMOTE_FROM_INDEX(6, boost::ulong_long_type) |
| #elif defined(BOOST_HAS_MS_INT64) |
| BOOST_TT_AUX_PROMOTE_FROM_INDEX(7, __int64 ) |
| BOOST_TT_AUX_PROMOTE_FROM_INDEX(8, unsigned __int64) |
| #endif |
| |
| #undef BOOST_TT_AUX_PROMOTE_FROM_INDEX |
| |
| |
| // Define BOOST_TT_AUX_PROMOTED_INDEX_TESTER: |
| #if !defined(BOOST_MSVC) |
| |
| template<int N> |
| struct sized_type_for_promotion |
| { |
| typedef char (&type)[N]; |
| }; |
| |
| #define BOOST_TT_AUX_PROMOTED_INDEX_TESTER(I,T) \ |
| sized_type_for_promotion<I>::type promoted_index_tester(T); |
| |
| #else |
| |
| #define BOOST_TT_AUX_PROMOTED_INDEX_TESTER(I,T) \ |
| char (&promoted_index_tester(T))[I]; |
| |
| #endif |
| |
| BOOST_TT_AUX_PROMOTED_INDEX_TESTER(1, int ) |
| BOOST_TT_AUX_PROMOTED_INDEX_TESTER(2, unsigned int ) |
| BOOST_TT_AUX_PROMOTED_INDEX_TESTER(3, long ) |
| BOOST_TT_AUX_PROMOTED_INDEX_TESTER(4, unsigned long) |
| |
| #if defined(BOOST_HAS_LONG_LONG) |
| BOOST_TT_AUX_PROMOTED_INDEX_TESTER(5, boost::long_long_type ) |
| BOOST_TT_AUX_PROMOTED_INDEX_TESTER(6, boost::ulong_long_type) |
| #elif defined(BOOST_HAS_MS_INT64) |
| BOOST_TT_AUX_PROMOTED_INDEX_TESTER(7, __int64 ) |
| BOOST_TT_AUX_PROMOTED_INDEX_TESTER(8, unsigned __int64) |
| #endif |
| |
| #undef BOOST_TT_AUX_PROMOTED_INDEX_TESTER |
| |
| |
| // Get an index of promoted type for type T. |
| // Precondition: need_promotion<T> |
| template<class T> |
| struct promoted_index |
| { |
| static T testee; // undefined |
| BOOST_STATIC_CONSTANT(int, value = sizeof(promoted_index_tester(+testee)) ); |
| // Unary plus promotes testee LOOK HERE ---> ^ |
| }; |
| |
| template<class T> |
| struct integral_promotion_impl |
| { |
| typedef BOOST_DEDUCED_TYPENAME promote_from_index< |
| (boost::type_traits::detail::promoted_index<T>::value) |
| , (boost::is_const<T>::value) |
| , (boost::is_volatile<T>::value) |
| >::type type; |
| }; |
| |
| template<class T> |
| struct integral_promotion |
| : public boost::mpl::eval_if< |
| need_promotion<BOOST_DEDUCED_TYPENAME remove_cv<T>::type> |
| , integral_promotion_impl<T> |
| , boost::mpl::identity<T> |
| > |
| { |
| }; |
| |
| } } |
| |
| BOOST_TT_AUX_TYPE_TRAIT_DEF1( |
| integral_promotion |
| , T |
| , BOOST_DEDUCED_TYPENAME |
| boost::type_traits::detail::integral_promotion<T>::type |
| ) |
| } |
| |
| #include <boost/type_traits/detail/type_trait_undef.hpp> |
| |
| #endif // #ifndef FILE_boost_type_traits_integral_promotion_hpp_INCLUDED |
| |