integral_promotion.hpp
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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 <boost/config.hpp>
15 
16 namespace boost {
17 
18 namespace type_traits { namespace detail {
19 
20 // 4.5/2
21 template <class T> struct need_promotion : public boost::is_enum<T> {};
22 
23 // 4.5/1
24 template<> struct need_promotion<char > : public true_type {};
25 template<> struct need_promotion<signed char > : public true_type {};
26 template<> struct need_promotion<unsigned char > : public true_type {};
27 template<> struct need_promotion<signed short int > : public true_type {};
28 template<> struct need_promotion<unsigned short int> : public true_type {};
29 
30 
31 // Specializations for non-standard types.
32 // Type is promoted if it's smaller then int.
33 
34 #define BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(T) \
35  template<> struct need_promotion<T> \
36  : public integral_constant<bool, (sizeof(T) < sizeof(int))> {};
37 
38 // Same set of integral types as in boost/type_traits/is_integral.hpp.
39 // Please, keep in sync.
40 #if (defined(BOOST_INTEL_CXX_VERSION) && defined(_MSC_VER) && (BOOST_INTEL_CXX_VERSION <= 600)) \
41  || (defined(__BORLANDC__) && (__BORLANDC__ == 0x600) && (_MSC_VER < 1300))
42 // TODO: common macro for this #if. Or better yet, PP SEQ of non-standard types.
49 #ifdef __BORLANDC__
52 #endif
53 #endif
54 
55 #if defined(BOOST_HAS_LONG_LONG)
56 BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(boost::ulong_long_type)
58 #elif defined(BOOST_HAS_MS_INT64)
61 #endif
62 
63 #undef BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE
64 
65 
66 #ifndef BOOST_NO_INTRINSIC_WCHAR_T
67 // 4.5/2
68 template<> struct need_promotion<wchar_t> : public true_type {};
69 #endif
70 
71 // 4.5/3 (integral bit-field) is not supported.
72 
73 // 4.5/4
74 template<> struct need_promotion<bool> : public true_type {};
75 
76 
77 // Get promoted type by index and cv qualifiers.
78 
79 template<int Index, int IsConst, int IsVolatile> struct promote_from_index;
80 
81 #define BOOST_TT_AUX_PROMOTE_FROM_INDEX(N,T) \
82  template<> struct promote_from_index<N,0,0> { typedef T type; }; \
83  template<> struct promote_from_index<N,0,1> { typedef T volatile type; }; \
84  template<> struct promote_from_index<N,1,0> { typedef T const type; }; \
85  template<> struct promote_from_index<N,1,1> { typedef T const volatile type; };
86 
87 
89 BOOST_TT_AUX_PROMOTE_FROM_INDEX(2, unsigned int )
90 BOOST_TT_AUX_PROMOTE_FROM_INDEX(3, long )
91 BOOST_TT_AUX_PROMOTE_FROM_INDEX(4, unsigned long)
92 
93 
94 // WARNING: integral promotions to non-standard types
95 // long long and __int64 are not defined by the standard.
96 // Additional specialisations and overloads shouldn't
97 // introduce ambiguity, though.
98 
99 #if defined(BOOST_HAS_LONG_LONG)
100 BOOST_TT_AUX_PROMOTE_FROM_INDEX(5, boost::long_long_type )
101 BOOST_TT_AUX_PROMOTE_FROM_INDEX(6, boost::ulong_long_type)
102 #elif defined(BOOST_HAS_MS_INT64)
104 BOOST_TT_AUX_PROMOTE_FROM_INDEX(8, unsigned __int64)
105 #endif
106 
107 #undef BOOST_TT_AUX_PROMOTE_FROM_INDEX
108 
109 
110 // Define BOOST_TT_AUX_PROMOTED_INDEX_TESTER:
111 #if !defined(BOOST_MSVC)
112 
113 template<int N>
115 {
116  typedef char (&type)[N];
117 };
118 
119 #define BOOST_TT_AUX_PROMOTED_INDEX_TESTER(I,T) \
120  sized_type_for_promotion<I>::type promoted_index_tester(T);
121 
122 #else
123 
124 #define BOOST_TT_AUX_PROMOTED_INDEX_TESTER(I,T) \
125  char (&promoted_index_tester(T))[I];
126 
127 #endif
128 
130 BOOST_TT_AUX_PROMOTED_INDEX_TESTER(2, unsigned int )
131 BOOST_TT_AUX_PROMOTED_INDEX_TESTER(3, long )
132 BOOST_TT_AUX_PROMOTED_INDEX_TESTER(4, unsigned long)
133 
134 #if defined(BOOST_HAS_LONG_LONG)
135 BOOST_TT_AUX_PROMOTED_INDEX_TESTER(5, boost::long_long_type )
136 BOOST_TT_AUX_PROMOTED_INDEX_TESTER(6, boost::ulong_long_type)
137 #elif defined(BOOST_HAS_MS_INT64)
139 BOOST_TT_AUX_PROMOTED_INDEX_TESTER(8, unsigned __int64)
140 #endif
141 
142 #undef BOOST_TT_AUX_PROMOTED_INDEX_TESTER
143 
144 
145 // Get an index of promoted type for type T.
146 // Precondition: need_promotion<T>
147 template<class T>
149 {
150  static T testee; // undefined
151  BOOST_STATIC_CONSTANT(int, value = sizeof(promoted_index_tester(+testee)) );
152  // Unary plus promotes testee LOOK HERE ---> ^
153 };
154 
155 template<class T>
157 {
162  >::type type;
163 };
164 
165 template<class T, bool b> struct integral_promotion { typedef T type; };
166 template<class T> struct integral_promotion<T, true> : public integral_promotion_impl<T>{};
167 
168 } }
169 
170 template <class T> struct integral_promotion
171 {
172 private:
174 public:
176 };
177 
178 #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
179 
180  template <class T> using integral_promotion_t = typename integral_promotion<T>::type;
181 
182 #endif
183 
184 }
185 
186 #endif // #ifndef FILE_boost_type_traits_integral_promotion_hpp_INCLUDED
187 
BOOST_MOVE_USE_STANDARD_LIBRARY_MOVE.
#define BOOST_TT_AUX_PROMOTE_NONSTANDARD_TYPE(T)
GLfloat value
#define BOOST_TT_AUX_PROMOTE_FROM_INDEX(N, T)
#define BOOST_TT_AUX_PROMOTED_INDEX_TESTER(I, T)
boost::type_traits::detail::need_promotion< typename remove_cv< T >::type > tag_type
#define BOOST_DEDUCED_TYPENAME
Definition: suffix.hpp:465
typename integral_promotion< T >::type integral_promotion_t
const char * detail
boost::type_traits::detail::integral_promotion< T, tag_type::value >::type type
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
#define BOOST_STATIC_CONSTANT(type, assignment)
Definition: suffix.hpp:394


librealsense2
Author(s): Sergey Dorodnicov , Doron Hirshberg , Mark Horn , Reagan Lopez , Itay Carpis
autogenerated on Mon May 3 2021 02:47:17