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
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
|
// Pair implementation -*- C++ -*-
// Copyright (C) 2001-2018 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 bits/stl_pair.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{utility}
*/
#ifndef _STL_PAIR_H
#define _STL_PAIR_H 1
#include <bits/move.h> // for std::move / std::forward, and std::swap
#if __cplusplus >= 201103L
#include <type_traits> // for std::__decay_and_strip too
#endif
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @addtogroup utilities
* @{
*/
#if __cplusplus >= 201103L
/// piecewise_construct_t
struct piecewise_construct_t { explicit piecewise_construct_t() = default; };
/// piecewise_construct
_GLIBCXX17_INLINE constexpr piecewise_construct_t piecewise_construct =
piecewise_construct_t();
// Forward declarations.
template<typename...>
class tuple;
template<std::size_t...>
struct _Index_tuple;
// Concept utility functions, reused in conditionally-explicit
// constructors.
// See PR 70437, don't look at is_constructible or
// is_convertible if the types are the same to
// avoid querying those properties for incomplete types.
template <bool, typename _T1, typename _T2>
struct _PCC
{
template <typename _U1, typename _U2>
static constexpr bool _ConstructiblePair()
{
return __and_<is_constructible<_T1, const _U1&>,
is_constructible<_T2, const _U2&>>::value;
}
template <typename _U1, typename _U2>
static constexpr bool _ImplicitlyConvertiblePair()
{
return __and_<is_convertible<const _U1&, _T1>,
is_convertible<const _U2&, _T2>>::value;
}
template <typename _U1, typename _U2>
static constexpr bool _MoveConstructiblePair()
{
return __and_<is_constructible<_T1, _U1&&>,
is_constructible<_T2, _U2&&>>::value;
}
template <typename _U1, typename _U2>
static constexpr bool _ImplicitlyMoveConvertiblePair()
{
return __and_<is_convertible<_U1&&, _T1>,
is_convertible<_U2&&, _T2>>::value;
}
template <bool __implicit, typename _U1, typename _U2>
static constexpr bool _CopyMovePair()
{
using __do_converts = __and_<is_convertible<const _U1&, _T1>,
is_convertible<_U2&&, _T2>>;
using __converts = typename conditional<__implicit,
__do_converts,
__not_<__do_converts>>::type;
return __and_<is_constructible<_T1, const _U1&>,
is_constructible<_T2, _U2&&>,
__converts
>::value;
}
template <bool __implicit, typename _U1, typename _U2>
static constexpr bool _MoveCopyPair()
{
using __do_converts = __and_<is_convertible<_U1&&, _T1>,
is_convertible<const _U2&, _T2>>;
using __converts = typename conditional<__implicit,
__do_converts,
__not_<__do_converts>>::type;
return __and_<is_constructible<_T1, _U1&&>,
is_constructible<_T2, const _U2&&>,
__converts
>::value;
}
};
template <typename _T1, typename _T2>
struct _PCC<false, _T1, _T2>
{
template <typename _U1, typename _U2>
static constexpr bool _ConstructiblePair()
{
return false;
}
template <typename _U1, typename _U2>
static constexpr bool _ImplicitlyConvertiblePair()
{
return false;
}
template <typename _U1, typename _U2>
static constexpr bool _MoveConstructiblePair()
{
return false;
}
template <typename _U1, typename _U2>
static constexpr bool _ImplicitlyMoveConvertiblePair()
{
return false;
}
};
// PR libstdc++/79141, a utility type for preventing
// initialization of an argument of a disabled assignment
// operator from a pair of empty braces.
struct __nonesuch_no_braces : std::__nonesuch {
explicit __nonesuch_no_braces(const __nonesuch&) = delete;
};
#endif // C++11
template<typename _U1, typename _U2> class __pair_base
{
#if __cplusplus >= 201103L
template<typename _T1, typename _T2> friend struct pair;
__pair_base() = default;
~__pair_base() = default;
__pair_base(const __pair_base&) = default;
__pair_base& operator=(const __pair_base&) = delete;
#endif // C++11
};
/**
* @brief Struct holding two objects of arbitrary type.
*
* @tparam _T1 Type of first object.
* @tparam _T2 Type of second object.
*/
template<typename _T1, typename _T2>
struct pair
: private __pair_base<_T1, _T2>
{
typedef _T1 first_type; /// @c first_type is the first bound type
typedef _T2 second_type; /// @c second_type is the second bound type
_T1 first; /// @c first is a copy of the first object
_T2 second; /// @c second is a copy of the second object
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 265. std::pair::pair() effects overly restrictive
/** The default constructor creates @c first and @c second using their
* respective default constructors. */
#if __cplusplus >= 201103L
template <typename _U1 = _T1,
typename _U2 = _T2,
typename enable_if<__and_<
__is_implicitly_default_constructible<_U1>,
__is_implicitly_default_constructible<_U2>>
::value, bool>::type = true>
#endif
_GLIBCXX_CONSTEXPR pair()
: first(), second() { }
#if __cplusplus >= 201103L
template <typename _U1 = _T1,
typename _U2 = _T2,
typename enable_if<__and_<
is_default_constructible<_U1>,
is_default_constructible<_U2>,
__not_<
__and_<__is_implicitly_default_constructible<_U1>,
__is_implicitly_default_constructible<_U2>>>>
::value, bool>::type = false>
explicit constexpr pair()
: first(), second() { }
#endif
/** Two objects may be passed to a @c pair constructor to be copied. */
#if __cplusplus < 201103L
pair(const _T1& __a, const _T2& __b)
: first(__a), second(__b) { }
#else
// Shortcut for constraining the templates that don't take pairs.
using _PCCP = _PCC<true, _T1, _T2>;
template<typename _U1 = _T1, typename _U2=_T2, typename
enable_if<_PCCP::template
_ConstructiblePair<_U1, _U2>()
&& _PCCP::template
_ImplicitlyConvertiblePair<_U1, _U2>(),
bool>::type=true>
constexpr pair(const _T1& __a, const _T2& __b)
: first(__a), second(__b) { }
template<typename _U1 = _T1, typename _U2=_T2, typename
enable_if<_PCCP::template
_ConstructiblePair<_U1, _U2>()
&& !_PCCP::template
_ImplicitlyConvertiblePair<_U1, _U2>(),
bool>::type=false>
explicit constexpr pair(const _T1& __a, const _T2& __b)
: first(__a), second(__b) { }
#endif
/** There is also a templated copy ctor for the @c pair class itself. */
#if __cplusplus < 201103L
template<typename _U1, typename _U2>
pair(const pair<_U1, _U2>& __p)
: first(__p.first), second(__p.second) { }
#else
// Shortcut for constraining the templates that take pairs.
template <typename _U1, typename _U2>
using _PCCFP = _PCC<!is_same<_T1, _U1>::value
|| !is_same<_T2, _U2>::value,
_T1, _T2>;
template<typename _U1, typename _U2, typename
enable_if<_PCCFP<_U1, _U2>::template
_ConstructiblePair<_U1, _U2>()
&& _PCCFP<_U1, _U2>::template
_ImplicitlyConvertiblePair<_U1, _U2>(),
bool>::type=true>
constexpr pair(const pair<_U1, _U2>& __p)
: first(__p.first), second(__p.second) { }
template<typename _U1, typename _U2, typename
enable_if<_PCCFP<_U1, _U2>::template
_ConstructiblePair<_U1, _U2>()
&& !_PCCFP<_U1, _U2>::template
_ImplicitlyConvertiblePair<_U1, _U2>(),
bool>::type=false>
explicit constexpr pair(const pair<_U1, _U2>& __p)
: first(__p.first), second(__p.second) { }
constexpr pair(const pair&) = default;
constexpr pair(pair&&) = default;
// DR 811.
template<typename _U1, typename
enable_if<_PCCP::template
_MoveCopyPair<true, _U1, _T2>(),
bool>::type=true>
constexpr pair(_U1&& __x, const _T2& __y)
: first(std::forward<_U1>(__x)), second(__y) { }
template<typename _U1, typename
enable_if<_PCCP::template
_MoveCopyPair<false, _U1, _T2>(),
bool>::type=false>
explicit constexpr pair(_U1&& __x, const _T2& __y)
: first(std::forward<_U1>(__x)), second(__y) { }
template<typename _U2, typename
enable_if<_PCCP::template
_CopyMovePair<true, _T1, _U2>(),
bool>::type=true>
constexpr pair(const _T1& __x, _U2&& __y)
: first(__x), second(std::forward<_U2>(__y)) { }
template<typename _U2, typename
enable_if<_PCCP::template
_CopyMovePair<false, _T1, _U2>(),
bool>::type=false>
explicit pair(const _T1& __x, _U2&& __y)
: first(__x), second(std::forward<_U2>(__y)) { }
template<typename _U1, typename _U2, typename
enable_if<_PCCP::template
_MoveConstructiblePair<_U1, _U2>()
&& _PCCP::template
_ImplicitlyMoveConvertiblePair<_U1, _U2>(),
bool>::type=true>
constexpr pair(_U1&& __x, _U2&& __y)
: first(std::forward<_U1>(__x)), second(std::forward<_U2>(__y)) { }
template<typename _U1, typename _U2, typename
enable_if<_PCCP::template
_MoveConstructiblePair<_U1, _U2>()
&& !_PCCP::template
_ImplicitlyMoveConvertiblePair<_U1, _U2>(),
bool>::type=false>
explicit constexpr pair(_U1&& __x, _U2&& __y)
: first(std::forward<_U1>(__x)), second(std::forward<_U2>(__y)) { }
template<typename _U1, typename _U2, typename
enable_if<_PCCFP<_U1, _U2>::template
_MoveConstructiblePair<_U1, _U2>()
&& _PCCFP<_U1, _U2>::template
_ImplicitlyMoveConvertiblePair<_U1, _U2>(),
bool>::type=true>
constexpr pair(pair<_U1, _U2>&& __p)
: first(std::forward<_U1>(__p.first)),
second(std::forward<_U2>(__p.second)) { }
template<typename _U1, typename _U2, typename
enable_if<_PCCFP<_U1, _U2>::template
_MoveConstructiblePair<_U1, _U2>()
&& !_PCCFP<_U1, _U2>::template
_ImplicitlyMoveConvertiblePair<_U1, _U2>(),
bool>::type=false>
explicit constexpr pair(pair<_U1, _U2>&& __p)
: first(std::forward<_U1>(__p.first)),
second(std::forward<_U2>(__p.second)) { }
template<typename... _Args1, typename... _Args2>
pair(piecewise_construct_t, tuple<_Args1...>, tuple<_Args2...>);
pair&
operator=(typename conditional<
__and_<is_copy_assignable<_T1>,
is_copy_assignable<_T2>>::value,
const pair&, const __nonesuch_no_braces&>::type __p)
{
first = __p.first;
second = __p.second;
return *this;
}
pair&
operator=(typename conditional<
__and_<is_move_assignable<_T1>,
is_move_assignable<_T2>>::value,
pair&&, __nonesuch_no_braces&&>::type __p)
noexcept(__and_<is_nothrow_move_assignable<_T1>,
is_nothrow_move_assignable<_T2>>::value)
{
first = std::forward<first_type>(__p.first);
second = std::forward<second_type>(__p.second);
return *this;
}
template<typename _U1, typename _U2>
typename enable_if<__and_<is_assignable<_T1&, const _U1&>,
is_assignable<_T2&, const _U2&>>::value,
pair&>::type
operator=(const pair<_U1, _U2>& __p)
{
first = __p.first;
second = __p.second;
return *this;
}
template<typename _U1, typename _U2>
typename enable_if<__and_<is_assignable<_T1&, _U1&&>,
is_assignable<_T2&, _U2&&>>::value,
pair&>::type
operator=(pair<_U1, _U2>&& __p)
{
first = std::forward<_U1>(__p.first);
second = std::forward<_U2>(__p.second);
return *this;
}
void
swap(pair& __p)
noexcept(__and_<__is_nothrow_swappable<_T1>,
__is_nothrow_swappable<_T2>>::value)
{
using std::swap;
swap(first, __p.first);
swap(second, __p.second);
}
private:
template<typename... _Args1, std::size_t... _Indexes1,
typename... _Args2, std::size_t... _Indexes2>
pair(tuple<_Args1...>&, tuple<_Args2...>&,
_Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>);
#endif
};
#if __cpp_deduction_guides >= 201606
template<typename _T1, typename _T2> pair(_T1, _T2) -> pair<_T1, _T2>;
#endif
/// Two pairs of the same type are equal iff their members are equal.
template<typename _T1, typename _T2>
inline _GLIBCXX_CONSTEXPR bool
operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
{ return __x.first == __y.first && __x.second == __y.second; }
/// <http://gcc.gnu.org/onlinedocs/libstdc++/manual/utilities.html>
template<typename _T1, typename _T2>
inline _GLIBCXX_CONSTEXPR bool
operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
{ return __x.first < __y.first
|| (!(__y.first < __x.first) && __x.second < __y.second); }
/// Uses @c operator== to find the result.
template<typename _T1, typename _T2>
inline _GLIBCXX_CONSTEXPR bool
operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
{ return !(__x == __y); }
/// Uses @c operator< to find the result.
template<typename _T1, typename _T2>
inline _GLIBCXX_CONSTEXPR bool
operator>(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
{ return __y < __x; }
/// Uses @c operator< to find the result.
template<typename _T1, typename _T2>
inline _GLIBCXX_CONSTEXPR bool
operator<=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
{ return !(__y < __x); }
/// Uses @c operator< to find the result.
template<typename _T1, typename _T2>
inline _GLIBCXX_CONSTEXPR bool
operator>=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
{ return !(__x < __y); }
#if __cplusplus >= 201103L
/// See std::pair::swap().
// Note: no std::swap overloads in C++03 mode, this has performance
// implications, see, eg, libstdc++/38466.
template<typename _T1, typename _T2>
inline
#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
// Constrained free swap overload, see p0185r1
typename enable_if<__and_<__is_swappable<_T1>,
__is_swappable<_T2>>::value>::type
#else
void
#endif
swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
noexcept(noexcept(__x.swap(__y)))
{ __x.swap(__y); }
#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
template<typename _T1, typename _T2>
typename enable_if<!__and_<__is_swappable<_T1>,
__is_swappable<_T2>>::value>::type
swap(pair<_T1, _T2>&, pair<_T1, _T2>&) = delete;
#endif
#endif // __cplusplus >= 201103L
/**
* @brief A convenience wrapper for creating a pair from two objects.
* @param __x The first object.
* @param __y The second object.
* @return A newly-constructed pair<> object of the appropriate type.
*
* The standard requires that the objects be passed by reference-to-const,
* but LWG issue #181 says they should be passed by const value. We follow
* the LWG by default.
*/
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 181. make_pair() unintended behavior
#if __cplusplus >= 201103L
// NB: DR 706.
template<typename _T1, typename _T2>
constexpr pair<typename __decay_and_strip<_T1>::__type,
typename __decay_and_strip<_T2>::__type>
make_pair(_T1&& __x, _T2&& __y)
{
typedef typename __decay_and_strip<_T1>::__type __ds_type1;
typedef typename __decay_and_strip<_T2>::__type __ds_type2;
typedef pair<__ds_type1, __ds_type2> __pair_type;
return __pair_type(std::forward<_T1>(__x), std::forward<_T2>(__y));
}
#else
template<typename _T1, typename _T2>
inline pair<_T1, _T2>
make_pair(_T1 __x, _T2 __y)
{ return pair<_T1, _T2>(__x, __y); }
#endif
/// @}
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif /* _STL_PAIR_H */
|
