1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
|
// <utility> -*- C++ -*-
// Copyright (C) 2001-2020 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/*
*
* Copyright (c) 1994
* Hewlett-Packard Company
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Hewlett-Packard Company makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
*
* Copyright (c) 1996,1997
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*/
/** @file include/utility
* This is a Standard C++ Library header.
*/
#ifndef _GLIBCXX_UTILITY
#define _GLIBCXX_UTILITY 1
#pragma GCC system_header
/**
* @defgroup utilities Utilities
*
* Components deemed generally useful. Includes pair, tuple,
* forward/move helpers, ratio, function object, metaprogramming and
* type traits, time, date, and memory functions.
*/
#include <bits/c++config.h>
#include <bits/stl_relops.h>
#include <bits/stl_pair.h>
#if __cplusplus >= 201103L
#include <type_traits>
#include <bits/move.h>
#include <initializer_list>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/// Finds the size of a given tuple type.
template<typename _Tp>
struct tuple_size;
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 2313. tuple_size should always derive from integral_constant<size_t, N>
// 2770. tuple_size<const T> specialization is not SFINAE compatible
template<typename _Tp,
typename _Up = typename remove_cv<_Tp>::type,
typename = typename enable_if<is_same<_Tp, _Up>::value>::type,
size_t = tuple_size<_Tp>::value>
using __enable_if_has_tuple_size = _Tp;
template<typename _Tp>
struct tuple_size<const __enable_if_has_tuple_size<_Tp>>
: public tuple_size<_Tp> { };
template<typename _Tp>
struct tuple_size<volatile __enable_if_has_tuple_size<_Tp>>
: public tuple_size<_Tp> { };
template<typename _Tp>
struct tuple_size<const volatile __enable_if_has_tuple_size<_Tp>>
: public tuple_size<_Tp> { };
/// Gives the type of the ith element of a given tuple type.
template<std::size_t __i, typename _Tp>
struct tuple_element;
// Duplicate of C++14's tuple_element_t for internal use in C++11 mode
template<std::size_t __i, typename _Tp>
using __tuple_element_t = typename tuple_element<__i, _Tp>::type;
template<std::size_t __i, typename _Tp>
struct tuple_element<__i, const _Tp>
{
typedef typename add_const<__tuple_element_t<__i, _Tp>>::type type;
};
template<std::size_t __i, typename _Tp>
struct tuple_element<__i, volatile _Tp>
{
typedef typename add_volatile<__tuple_element_t<__i, _Tp>>::type type;
};
template<std::size_t __i, typename _Tp>
struct tuple_element<__i, const volatile _Tp>
{
typedef typename add_cv<__tuple_element_t<__i, _Tp>>::type type;
};
#if __cplusplus >= 201402L
// The standard says this macro and alias template should be in <tuple>
// but we define them here, to be available when the partial specializations
// of tuple_element<pair<T,U>> and tuple_element<array<T,N>> are defined.
#define __cpp_lib_tuple_element_t 201402L
template<std::size_t __i, typename _Tp>
using tuple_element_t = typename tuple_element<__i, _Tp>::type;
#endif
// Various functions which give std::pair a tuple-like interface.
/// Partial specialization for std::pair
template<typename _T1, typename _T2>
struct __is_tuple_like_impl<std::pair<_T1, _T2>> : true_type
{ };
/// Partial specialization for std::pair
template<class _Tp1, class _Tp2>
struct tuple_size<std::pair<_Tp1, _Tp2>>
: public integral_constant<std::size_t, 2> { };
/// Partial specialization for std::pair
template<class _Tp1, class _Tp2>
struct tuple_element<0, std::pair<_Tp1, _Tp2>>
{ typedef _Tp1 type; };
/// Partial specialization for std::pair
template<class _Tp1, class _Tp2>
struct tuple_element<1, std::pair<_Tp1, _Tp2>>
{ typedef _Tp2 type; };
template<std::size_t _Int>
struct __pair_get;
template<>
struct __pair_get<0>
{
template<typename _Tp1, typename _Tp2>
static constexpr _Tp1&
__get(std::pair<_Tp1, _Tp2>& __pair) noexcept
{ return __pair.first; }
template<typename _Tp1, typename _Tp2>
static constexpr _Tp1&&
__move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept
{ return std::forward<_Tp1>(__pair.first); }
template<typename _Tp1, typename _Tp2>
static constexpr const _Tp1&
__const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept
{ return __pair.first; }
template<typename _Tp1, typename _Tp2>
static constexpr const _Tp1&&
__const_move_get(const std::pair<_Tp1, _Tp2>&& __pair) noexcept
{ return std::forward<const _Tp1>(__pair.first); }
};
template<>
struct __pair_get<1>
{
template<typename _Tp1, typename _Tp2>
static constexpr _Tp2&
__get(std::pair<_Tp1, _Tp2>& __pair) noexcept
{ return __pair.second; }
template<typename _Tp1, typename _Tp2>
static constexpr _Tp2&&
__move_get(std::pair<_Tp1, _Tp2>&& __pair) noexcept
{ return std::forward<_Tp2>(__pair.second); }
template<typename _Tp1, typename _Tp2>
static constexpr const _Tp2&
__const_get(const std::pair<_Tp1, _Tp2>& __pair) noexcept
{ return __pair.second; }
template<typename _Tp1, typename _Tp2>
static constexpr const _Tp2&&
__const_move_get(const std::pair<_Tp1, _Tp2>&& __pair) noexcept
{ return std::forward<const _Tp2>(__pair.second); }
};
template<std::size_t _Int, class _Tp1, class _Tp2>
constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&
get(std::pair<_Tp1, _Tp2>& __in) noexcept
{ return __pair_get<_Int>::__get(__in); }
template<std::size_t _Int, class _Tp1, class _Tp2>
constexpr typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&&
get(std::pair<_Tp1, _Tp2>&& __in) noexcept
{ return __pair_get<_Int>::__move_get(std::move(__in)); }
template<std::size_t _Int, class _Tp1, class _Tp2>
constexpr const typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&
get(const std::pair<_Tp1, _Tp2>& __in) noexcept
{ return __pair_get<_Int>::__const_get(__in); }
template<std::size_t _Int, class _Tp1, class _Tp2>
constexpr const typename tuple_element<_Int, std::pair<_Tp1, _Tp2>>::type&&
get(const std::pair<_Tp1, _Tp2>&& __in) noexcept
{ return __pair_get<_Int>::__const_move_get(std::move(__in)); }
#if __cplusplus > 201103L
#define __cpp_lib_tuples_by_type 201304
template <typename _Tp, typename _Up>
constexpr _Tp&
get(pair<_Tp, _Up>& __p) noexcept
{ return __p.first; }
template <typename _Tp, typename _Up>
constexpr const _Tp&
get(const pair<_Tp, _Up>& __p) noexcept
{ return __p.first; }
template <typename _Tp, typename _Up>
constexpr _Tp&&
get(pair<_Tp, _Up>&& __p) noexcept
{ return std::move(__p.first); }
template <typename _Tp, typename _Up>
constexpr const _Tp&&
get(const pair<_Tp, _Up>&& __p) noexcept
{ return std::move(__p.first); }
template <typename _Tp, typename _Up>
constexpr _Tp&
get(pair<_Up, _Tp>& __p) noexcept
{ return __p.second; }
template <typename _Tp, typename _Up>
constexpr const _Tp&
get(const pair<_Up, _Tp>& __p) noexcept
{ return __p.second; }
template <typename _Tp, typename _Up>
constexpr _Tp&&
get(pair<_Up, _Tp>&& __p) noexcept
{ return std::move(__p.second); }
template <typename _Tp, typename _Up>
constexpr const _Tp&&
get(const pair<_Up, _Tp>&& __p) noexcept
{ return std::move(__p.second); }
#define __cpp_lib_exchange_function 201304
#if __cplusplus > 201703L
# define __cpp_lib_constexpr_algorithms 201806L
#endif
/// Assign @p __new_val to @p __obj and return its previous value.
template <typename _Tp, typename _Up = _Tp>
_GLIBCXX20_CONSTEXPR
inline _Tp
exchange(_Tp& __obj, _Up&& __new_val)
{ return std::__exchange(__obj, std::forward<_Up>(__new_val)); }
#endif
// Stores a tuple of indices. Used by tuple and pair, and by bind() to
// extract the elements in a tuple.
template<size_t... _Indexes> struct _Index_tuple { };
#ifdef __has_builtin
# if __has_builtin(__make_integer_seq)
# define _GLIBCXX_USE_MAKE_INTEGER_SEQ 1
# endif
#endif
// Builds an _Index_tuple<0, 1, 2, ..., _Num-1>.
template<size_t _Num>
struct _Build_index_tuple
{
#if _GLIBCXX_USE_MAKE_INTEGER_SEQ
template<typename, size_t... _Indices>
using _IdxTuple = _Index_tuple<_Indices...>;
using __type = __make_integer_seq<_IdxTuple, size_t, _Num>;
#else
using __type = _Index_tuple<__integer_pack(_Num)...>;
#endif
};
#if __cplusplus > 201103L
#define __cpp_lib_integer_sequence 201304
/// Class template integer_sequence
template<typename _Tp, _Tp... _Idx>
struct integer_sequence
{
typedef _Tp value_type;
static constexpr size_t size() noexcept { return sizeof...(_Idx); }
};
/// Alias template make_integer_sequence
template<typename _Tp, _Tp _Num>
using make_integer_sequence
#if _GLIBCXX_USE_MAKE_INTEGER_SEQ
= __make_integer_seq<integer_sequence, _Tp, _Num>;
#else
= integer_sequence<_Tp, __integer_pack(_Num)...>;
#endif
#undef _GLIBCXX_USE_MAKE_INTEGER_SEQ
/// Alias template index_sequence
template<size_t... _Idx>
using index_sequence = integer_sequence<size_t, _Idx...>;
/// Alias template make_index_sequence
template<size_t _Num>
using make_index_sequence = make_integer_sequence<size_t, _Num>;
/// Alias template index_sequence_for
template<typename... _Types>
using index_sequence_for = make_index_sequence<sizeof...(_Types)>;
#endif
#if __cplusplus > 201402L
struct in_place_t {
explicit in_place_t() = default;
};
inline constexpr in_place_t in_place{};
template<typename _Tp> struct in_place_type_t
{
explicit in_place_type_t() = default;
};
template<typename _Tp>
inline constexpr in_place_type_t<_Tp> in_place_type{};
template<size_t _Idx> struct in_place_index_t
{
explicit in_place_index_t() = default;
};
template<size_t _Idx>
inline constexpr in_place_index_t<_Idx> in_place_index{};
template<typename>
struct __is_in_place_type_impl : false_type
{ };
template<typename _Tp>
struct __is_in_place_type_impl<in_place_type_t<_Tp>> : true_type
{ };
template<typename _Tp>
struct __is_in_place_type
: public __is_in_place_type_impl<_Tp>
{ };
#define __cpp_lib_as_const 201510
template<typename _Tp>
constexpr add_const_t<_Tp>& as_const(_Tp& __t) noexcept { return __t; }
template<typename _Tp>
void as_const(const _Tp&&) = delete;
#endif // C++17
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif
#endif /* _GLIBCXX_UTILITY */
|