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- // 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/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>
- 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, bool b> struct integral_promotion { typedef T type; };
- template<class T> struct integral_promotion<T, true> : public integral_promotion_impl<T>{};
- } }
- template <class T> struct integral_promotion
- {
- private:
- typedef boost::type_traits::detail::need_promotion<typename remove_cv<T>::type> tag_type;
- public:
- typedef typename boost::type_traits::detail::integral_promotion<T, tag_type::value>::type type;
- };
- #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
- template <class T> using integral_promotion_t = typename integral_promotion<T>::type;
- #endif
- }
- #endif // #ifndef FILE_boost_type_traits_integral_promotion_hpp_INCLUDED
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