libstdc++
experimental/type_traits
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1 // Variable Templates For Type Traits -*- C++ -*-
2 
3 // Copyright (C) 2014-2019 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10 
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
15 
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19 
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24 
25 /** @file experimental/type_traits
26  * This is a TS C++ Library header.
27  */
28 
29 //
30 // N3932 Variable Templates For Type Traits (Revision 1)
31 //
32 
33 #ifndef _GLIBCXX_EXPERIMENTAL_TYPE_TRAITS
34 #define _GLIBCXX_EXPERIMENTAL_TYPE_TRAITS 1
35 
36 #pragma GCC system_header
37 
38 #if __cplusplus >= 201402L
39 
40 #include <type_traits>
41 #include <experimental/bits/lfts_config.h>
42 
43 namespace std _GLIBCXX_VISIBILITY(default)
44 {
45 _GLIBCXX_BEGIN_NAMESPACE_VERSION
46 
47 namespace experimental
48 {
49 inline namespace fundamentals_v1
50 {
51 #define __cpp_lib_experimental_type_trait_variable_templates 201402
52 
53 // See C++14 20.10.4.1, primary type categories
54 template <typename _Tp>
55  constexpr bool is_void_v = is_void<_Tp>::value;
56 template <typename _Tp>
57  constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value;
58 template <typename _Tp>
59  constexpr bool is_integral_v = is_integral<_Tp>::value;
60 template <typename _Tp>
61  constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
62 template <typename _Tp>
63  constexpr bool is_array_v = is_array<_Tp>::value;
64 template <typename _Tp>
65  constexpr bool is_pointer_v = is_pointer<_Tp>::value;
66 template <typename _Tp>
67  constexpr bool is_lvalue_reference_v = is_lvalue_reference<_Tp>::value;
68 template <typename _Tp>
69  constexpr bool is_rvalue_reference_v = is_rvalue_reference<_Tp>::value;
70 template <typename _Tp>
71  constexpr bool is_member_object_pointer_v =
72  is_member_object_pointer<_Tp>::value;
73 template <typename _Tp>
74  constexpr bool is_member_function_pointer_v =
75  is_member_function_pointer<_Tp>::value;
76 template <typename _Tp>
77  constexpr bool is_enum_v = is_enum<_Tp>::value;
78 template <typename _Tp>
79  constexpr bool is_union_v = is_union<_Tp>::value;
80 template <typename _Tp>
81  constexpr bool is_class_v = is_class<_Tp>::value;
82 template <typename _Tp>
83  constexpr bool is_function_v = is_function<_Tp>::value;
84 
85 // See C++14 20.10.4.2, composite type categories
86 template <typename _Tp>
87  constexpr bool is_reference_v = is_reference<_Tp>::value;
88 template <typename _Tp>
89  constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value;
90 template <typename _Tp>
91  constexpr bool is_fundamental_v = is_fundamental<_Tp>::value;
92 template <typename _Tp>
93  constexpr bool is_object_v = is_object<_Tp>::value;
94 template <typename _Tp>
95  constexpr bool is_scalar_v = is_scalar<_Tp>::value;
96 template <typename _Tp>
97  constexpr bool is_compound_v = is_compound<_Tp>::value;
98 template <typename _Tp>
99  constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
100 
101 // See C++14 20.10.4.3, type properties
102 template <typename _Tp>
103  constexpr bool is_const_v = is_const<_Tp>::value;
104 template <typename _Tp>
105  constexpr bool is_volatile_v = is_volatile<_Tp>::value;
106 template <typename _Tp>
107  constexpr bool is_trivial_v = is_trivial<_Tp>::value;
108 template <typename _Tp>
109  constexpr bool is_trivially_copyable_v = is_trivially_copyable<_Tp>::value;
110 template <typename _Tp>
111  constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value;
112 template <typename _Tp>
113  constexpr bool is_pod_v = is_pod<_Tp>::value;
114 template <typename _Tp>
115  constexpr bool is_literal_type_v = is_literal_type<_Tp>::value;
116 template <typename _Tp>
117  constexpr bool is_empty_v = is_empty<_Tp>::value;
118 template <typename _Tp>
119  constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value;
120 template <typename _Tp>
121  constexpr bool is_abstract_v = is_abstract<_Tp>::value;
122 template <typename _Tp>
123  constexpr bool is_final_v = is_final<_Tp>::value;
124 template <typename _Tp>
125  constexpr bool is_signed_v = is_signed<_Tp>::value;
126 template <typename _Tp>
127  constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
128 template <typename _Tp, typename... _Args>
129  constexpr bool is_constructible_v = is_constructible<_Tp, _Args...>::value;
130 template <typename _Tp>
131  constexpr bool is_default_constructible_v =
132  is_default_constructible<_Tp>::value;
133 template <typename _Tp>
134  constexpr bool is_copy_constructible_v = is_copy_constructible<_Tp>::value;
135 template <typename _Tp>
136  constexpr bool is_move_constructible_v = is_move_constructible<_Tp>::value;
137 template <typename _Tp, typename _Up>
138  constexpr bool is_assignable_v = is_assignable<_Tp, _Up>::value;
139 template <typename _Tp>
140  constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value;
141 template <typename _Tp>
142  constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value;
143 template <typename _Tp>
144  constexpr bool is_destructible_v = is_destructible<_Tp>::value;
145 template <typename _Tp, typename... _Args>
146  constexpr bool is_trivially_constructible_v =
147  is_trivially_constructible<_Tp, _Args...>::value;
148 template <typename _Tp>
149  constexpr bool is_trivially_default_constructible_v =
150  is_trivially_default_constructible<_Tp>::value;
151 template <typename _Tp>
152  constexpr bool is_trivially_copy_constructible_v =
153  is_trivially_copy_constructible<_Tp>::value;
154 template <typename _Tp>
155  constexpr bool is_trivially_move_constructible_v =
156  is_trivially_move_constructible<_Tp>::value;
157 template <typename _Tp, typename _Up>
158  constexpr bool is_trivially_assignable_v =
159  is_trivially_assignable<_Tp, _Up>::value;
160 template <typename _Tp>
161  constexpr bool is_trivially_copy_assignable_v =
162  is_trivially_copy_assignable<_Tp>::value;
163 template <typename _Tp>
164  constexpr bool is_trivially_move_assignable_v =
165  is_trivially_move_assignable<_Tp>::value;
166 template <typename _Tp>
167  constexpr bool is_trivially_destructible_v =
168  is_trivially_destructible<_Tp>::value;
169 template <typename _Tp, typename... _Args>
170  constexpr bool is_nothrow_constructible_v =
171  is_nothrow_constructible<_Tp, _Args...>::value;
172 template <typename _Tp>
173  constexpr bool is_nothrow_default_constructible_v =
174  is_nothrow_default_constructible<_Tp>::value;
175 template <typename _Tp>
176  constexpr bool is_nothrow_copy_constructible_v =
177  is_nothrow_copy_constructible<_Tp>::value;
178 template <typename _Tp>
179  constexpr bool is_nothrow_move_constructible_v =
180  is_nothrow_move_constructible<_Tp>::value;
181 template <typename _Tp, typename _Up>
182  constexpr bool is_nothrow_assignable_v =
183  is_nothrow_assignable<_Tp, _Up>::value;
184 template <typename _Tp>
185  constexpr bool is_nothrow_copy_assignable_v =
186  is_nothrow_copy_assignable<_Tp>::value;
187 template <typename _Tp>
188  constexpr bool is_nothrow_move_assignable_v =
189  is_nothrow_move_assignable<_Tp>::value;
190 template <typename _Tp>
191  constexpr bool is_nothrow_destructible_v =
192  is_nothrow_destructible<_Tp>::value;
193 template <typename _Tp>
194  constexpr bool has_virtual_destructor_v =
195  has_virtual_destructor<_Tp>::value;
196 
197 // See C++14 20.10.5, type property queries
198 template <typename _Tp>
199  constexpr size_t alignment_of_v = alignment_of<_Tp>::value;
200 template <typename _Tp>
201  constexpr size_t rank_v = rank<_Tp>::value;
202 template <typename _Tp, unsigned _Idx = 0>
203  constexpr size_t extent_v = extent<_Tp, _Idx>::value;
204 
205 // See C++14 20.10.6, type relations
206 template <typename _Tp, typename _Up>
207  constexpr bool is_same_v = is_same<_Tp, _Up>::value;
208 template <typename _Base, typename _Derived>
209  constexpr bool is_base_of_v = is_base_of<_Base, _Derived>::value;
210 template <typename _From, typename _To>
211  constexpr bool is_convertible_v = is_convertible<_From, _To>::value;
212 
213 
214  // 3.3.2, Other type transformations
215  // invocation_type (still unimplemented)
216  // raw_invocation_type (still unimplemented)
217  // invocation_type_t (still unimplemented)
218  // raw_invocation_type_t (still unimplemented)
219 } // namespace fundamentals_v1
220 
221 inline namespace fundamentals_v2
222 {
223 #define __cpp_lib_experimental_detect 201505
224 
225 // [meta.detect]
226 
227 template<typename...> using void_t = void;
228 
229 struct nonesuch
230 {
231  nonesuch() = delete;
232  ~nonesuch() = delete;
233  nonesuch(nonesuch const&) = delete;
234  void operator=(nonesuch const&) = delete;
235 };
236 
237 template<template<typename...> class _Op, typename... _Args>
238  using is_detected
239  = typename std::__detector<nonesuch, void, _Op, _Args...>::value_t;
240 
241 template<template<typename...> class _Op, typename... _Args>
242  constexpr bool is_detected_v = is_detected<_Op, _Args...>::value;
243 
244 template<template<typename...> class _Op, typename... _Args>
245  using detected_t
246  = typename std::__detector<nonesuch, void, _Op, _Args...>::type;
247 
248 template<typename _Default, template<typename...> class _Op, typename... _Args>
249  using detected_or = std::__detected_or<_Default, _Op, _Args...>;
250 
251 template<typename _Default, template<typename...> class _Op, typename... _Args>
252  using detected_or_t = typename detected_or<_Default, _Op, _Args...>::type;
253 
254 template<typename _Expected, template<typename...> class _Op, typename... _Args>
255  using is_detected_exact = is_same<_Expected, detected_t<_Op, _Args...>>;
256 
257 template<typename _Expected, template<typename...> class _Op, typename... _Args>
258  constexpr bool is_detected_exact_v
259  = is_detected_exact<_Expected, _Op, _Args...>::value;
260 
261 template<typename _To, template<typename...> class _Op, typename... _Args>
262  using is_detected_convertible
263  = is_convertible<detected_t<_Op, _Args...>, _To>;
264 
265 template<typename _To, template<typename...> class _Op, typename... _Args>
266  constexpr bool is_detected_convertible_v
267  = is_detected_convertible<_To, _Op, _Args...>::value;
268 
269 #define __cpp_lib_experimental_logical_traits 201511
270 
271 template<typename... _Bn>
272  struct conjunction
273  : __and_<_Bn...>
274  { };
275 
276 template<typename... _Bn>
277  struct disjunction
278  : __or_<_Bn...>
279  { };
280 
281 template<typename _Pp>
282  struct negation
283  : __not_<_Pp>
284  { };
285 
286 template<typename... _Bn>
287  constexpr bool conjunction_v
288  = conjunction<_Bn...>::value;
289 
290 template<typename... _Bn>
291  constexpr bool disjunction_v
292  = disjunction<_Bn...>::value;
293 
294 template<typename _Pp>
295  constexpr bool negation_v
296  = negation<_Pp>::value;
297 } // namespace fundamentals_v2
298 } // namespace experimental
299 
300 _GLIBCXX_END_NAMESPACE_VERSION
301 } // namespace std
302 
303 #endif // __cplusplus <= 201103L
304 
305 #endif // _GLIBCXX_EXPERIMENTAL_TYPE_TRAITS