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authorRemko Tronçon <git@el-tramo.be>2009-06-01 08:48:42 (GMT)
committerRemko Tronçon <git@el-tramo.be>2009-06-01 09:24:28 (GMT)
commit2812bddd81f8a1b804c7460f4e14cd0aa393d129 (patch)
treed46294f35150c4f0f43deaf2d31fceaf945ae715 /3rdParty/Boost/boost/type_traits/integral_promotion.hpp
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Diffstat (limited to '3rdParty/Boost/boost/type_traits/integral_promotion.hpp')
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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/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 : boost::is_enum<T> {};
+
+// 4.5/1
+template<> struct need_promotion<char > : true_type {};
+template<> struct need_promotion<signed char > : true_type {};
+template<> struct need_promotion<unsigned char > : true_type {};
+template<> struct need_promotion<signed short int > : true_type {};
+template<> struct need_promotion<unsigned short int> : 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> \
+ : 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_MSVC) && (BOOST_MSVC < 1300)) \
+ || (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> : true_type {};
+#endif
+
+// 4.5/3 (integral bit-field) is not supported.
+
+// 4.5/4
+template<> struct need_promotion<bool> : 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
+ : 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
+