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