Line data Source code
1 : // Core algorithmic facilities -*- C++ -*-
2 :
3 : // Copyright (C) 2001-2018 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 : /*
26 : *
27 : * Copyright (c) 1994
28 : * Hewlett-Packard Company
29 : *
30 : * Permission to use, copy, modify, distribute and sell this software
31 : * and its documentation for any purpose is hereby granted without fee,
32 : * provided that the above copyright notice appear in all copies and
33 : * that both that copyright notice and this permission notice appear
34 : * in supporting documentation. Hewlett-Packard Company makes no
35 : * representations about the suitability of this software for any
36 : * purpose. It is provided "as is" without express or implied warranty.
37 : *
38 : *
39 : * Copyright (c) 1996-1998
40 : * Silicon Graphics Computer Systems, Inc.
41 : *
42 : * Permission to use, copy, modify, distribute and sell this software
43 : * and its documentation for any purpose is hereby granted without fee,
44 : * provided that the above copyright notice appear in all copies and
45 : * that both that copyright notice and this permission notice appear
46 : * in supporting documentation. Silicon Graphics makes no
47 : * representations about the suitability of this software for any
48 : * purpose. It is provided "as is" without express or implied warranty.
49 : */
50 :
51 : /** @file bits/stl_algobase.h
52 : * This is an internal header file, included by other library headers.
53 : * Do not attempt to use it directly. @headername{algorithm}
54 : */
55 :
56 : #ifndef _STL_ALGOBASE_H
57 : #define _STL_ALGOBASE_H 1
58 :
59 : #include <bits/c++config.h>
60 : #include <bits/functexcept.h>
61 : #include <bits/cpp_type_traits.h>
62 : #include <ext/type_traits.h>
63 : #include <ext/numeric_traits.h>
64 : #include <bits/stl_pair.h>
65 : #include <bits/stl_iterator_base_types.h>
66 : #include <bits/stl_iterator_base_funcs.h>
67 : #include <bits/stl_iterator.h>
68 : #include <bits/concept_check.h>
69 : #include <debug/debug.h>
70 : #include <bits/move.h> // For std::swap
71 : #include <bits/predefined_ops.h>
72 :
73 : namespace std _GLIBCXX_VISIBILITY(default)
74 : {
75 : _GLIBCXX_BEGIN_NAMESPACE_VERSION
76 :
77 : #if __cplusplus < 201103L
78 : // See http://gcc.gnu.org/ml/libstdc++/2004-08/msg00167.html: in a
79 : // nutshell, we are partially implementing the resolution of DR 187,
80 : // when it's safe, i.e., the value_types are equal.
81 : template<bool _BoolType>
82 : struct __iter_swap
83 : {
84 : template<typename _ForwardIterator1, typename _ForwardIterator2>
85 : static void
86 : iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
87 : {
88 : typedef typename iterator_traits<_ForwardIterator1>::value_type
89 : _ValueType1;
90 : _ValueType1 __tmp = *__a;
91 : *__a = *__b;
92 : *__b = __tmp;
93 : }
94 : };
95 :
96 : template<>
97 : struct __iter_swap<true>
98 : {
99 : template<typename _ForwardIterator1, typename _ForwardIterator2>
100 : static void
101 : iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
102 : {
103 : swap(*__a, *__b);
104 : }
105 : };
106 : #endif
107 :
108 : /**
109 : * @brief Swaps the contents of two iterators.
110 : * @ingroup mutating_algorithms
111 : * @param __a An iterator.
112 : * @param __b Another iterator.
113 : * @return Nothing.
114 : *
115 : * This function swaps the values pointed to by two iterators, not the
116 : * iterators themselves.
117 : */
118 : template<typename _ForwardIterator1, typename _ForwardIterator2>
119 : inline void
120 637 : iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
121 : {
122 : // concept requirements
123 : __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
124 : _ForwardIterator1>)
125 : __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
126 : _ForwardIterator2>)
127 :
128 : #if __cplusplus < 201103L
129 : typedef typename iterator_traits<_ForwardIterator1>::value_type
130 : _ValueType1;
131 : typedef typename iterator_traits<_ForwardIterator2>::value_type
132 : _ValueType2;
133 :
134 : __glibcxx_function_requires(_ConvertibleConcept<_ValueType1,
135 : _ValueType2>)
136 : __glibcxx_function_requires(_ConvertibleConcept<_ValueType2,
137 : _ValueType1>)
138 :
139 : typedef typename iterator_traits<_ForwardIterator1>::reference
140 : _ReferenceType1;
141 : typedef typename iterator_traits<_ForwardIterator2>::reference
142 : _ReferenceType2;
143 : std::__iter_swap<__are_same<_ValueType1, _ValueType2>::__value
144 : && __are_same<_ValueType1&, _ReferenceType1>::__value
145 : && __are_same<_ValueType2&, _ReferenceType2>::__value>::
146 : iter_swap(__a, __b);
147 : #else
148 637 : swap(*__a, *__b);
149 : #endif
150 637 : }
151 :
152 : /**
153 : * @brief Swap the elements of two sequences.
154 : * @ingroup mutating_algorithms
155 : * @param __first1 A forward iterator.
156 : * @param __last1 A forward iterator.
157 : * @param __first2 A forward iterator.
158 : * @return An iterator equal to @p first2+(last1-first1).
159 : *
160 : * Swaps each element in the range @p [first1,last1) with the
161 : * corresponding element in the range @p [first2,(last1-first1)).
162 : * The ranges must not overlap.
163 : */
164 : template<typename _ForwardIterator1, typename _ForwardIterator2>
165 : _ForwardIterator2
166 : swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
167 : _ForwardIterator2 __first2)
168 : {
169 : // concept requirements
170 : __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
171 : _ForwardIterator1>)
172 : __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
173 : _ForwardIterator2>)
174 : __glibcxx_requires_valid_range(__first1, __last1);
175 :
176 : for (; __first1 != __last1; ++__first1, (void)++__first2)
177 : std::iter_swap(__first1, __first2);
178 : return __first2;
179 : }
180 :
181 : /**
182 : * @brief This does what you think it does.
183 : * @ingroup sorting_algorithms
184 : * @param __a A thing of arbitrary type.
185 : * @param __b Another thing of arbitrary type.
186 : * @return The lesser of the parameters.
187 : *
188 : * This is the simple classic generic implementation. It will work on
189 : * temporary expressions, since they are only evaluated once, unlike a
190 : * preprocessor macro.
191 : */
192 : template<typename _Tp>
193 : _GLIBCXX14_CONSTEXPR
194 : inline const _Tp&
195 45 : min(const _Tp& __a, const _Tp& __b)
196 : {
197 : // concept requirements
198 : __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
199 : //return __b < __a ? __b : __a;
200 45 : if (__b < __a)
201 1 : return __b;
202 44 : return __a;
203 : }
204 :
205 : /**
206 : * @brief This does what you think it does.
207 : * @ingroup sorting_algorithms
208 : * @param __a A thing of arbitrary type.
209 : * @param __b Another thing of arbitrary type.
210 : * @return The greater of the parameters.
211 : *
212 : * This is the simple classic generic implementation. It will work on
213 : * temporary expressions, since they are only evaluated once, unlike a
214 : * preprocessor macro.
215 : */
216 : template<typename _Tp>
217 : _GLIBCXX14_CONSTEXPR
218 : inline const _Tp&
219 29482 : max(const _Tp& __a, const _Tp& __b)
220 : {
221 : // concept requirements
222 : __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
223 : //return __a < __b ? __b : __a;
224 29482 : if (__a < __b)
225 708 : return __b;
226 28774 : return __a;
227 : }
228 :
229 : /**
230 : * @brief This does what you think it does.
231 : * @ingroup sorting_algorithms
232 : * @param __a A thing of arbitrary type.
233 : * @param __b Another thing of arbitrary type.
234 : * @param __comp A @link comparison_functors comparison functor@endlink.
235 : * @return The lesser of the parameters.
236 : *
237 : * This will work on temporary expressions, since they are only evaluated
238 : * once, unlike a preprocessor macro.
239 : */
240 : template<typename _Tp, typename _Compare>
241 : _GLIBCXX14_CONSTEXPR
242 : inline const _Tp&
243 : min(const _Tp& __a, const _Tp& __b, _Compare __comp)
244 : {
245 : //return __comp(__b, __a) ? __b : __a;
246 : if (__comp(__b, __a))
247 : return __b;
248 : return __a;
249 : }
250 :
251 : /**
252 : * @brief This does what you think it does.
253 : * @ingroup sorting_algorithms
254 : * @param __a A thing of arbitrary type.
255 : * @param __b Another thing of arbitrary type.
256 : * @param __comp A @link comparison_functors comparison functor@endlink.
257 : * @return The greater of the parameters.
258 : *
259 : * This will work on temporary expressions, since they are only evaluated
260 : * once, unlike a preprocessor macro.
261 : */
262 : template<typename _Tp, typename _Compare>
263 : _GLIBCXX14_CONSTEXPR
264 : inline const _Tp&
265 : max(const _Tp& __a, const _Tp& __b, _Compare __comp)
266 : {
267 : //return __comp(__a, __b) ? __b : __a;
268 : if (__comp(__a, __b))
269 : return __b;
270 : return __a;
271 : }
272 :
273 : // Fallback implementation of the function in bits/stl_iterator.h used to
274 : // remove the __normal_iterator wrapper. See copy, fill, ...
275 : template<typename _Iterator>
276 : inline _Iterator
277 7679 : __niter_base(_Iterator __it)
278 7679 : { return __it; }
279 :
280 : // All of these auxiliary structs serve two purposes. (1) Replace
281 : // calls to copy with memmove whenever possible. (Memmove, not memcpy,
282 : // because the input and output ranges are permitted to overlap.)
283 : // (2) If we're using random access iterators, then write the loop as
284 : // a for loop with an explicit count.
285 :
286 : template<bool, bool, typename>
287 : struct __copy_move
288 : {
289 : template<typename _II, typename _OI>
290 : static _OI
291 : __copy_m(_II __first, _II __last, _OI __result)
292 : {
293 : for (; __first != __last; ++__result, (void)++__first)
294 : *__result = *__first;
295 : return __result;
296 : }
297 : };
298 :
299 : #if __cplusplus >= 201103L
300 : template<typename _Category>
301 : struct __copy_move<true, false, _Category>
302 : {
303 : template<typename _II, typename _OI>
304 : static _OI
305 : __copy_m(_II __first, _II __last, _OI __result)
306 : {
307 : for (; __first != __last; ++__result, (void)++__first)
308 : *__result = std::move(*__first);
309 : return __result;
310 : }
311 : };
312 : #endif
313 :
314 : template<>
315 : struct __copy_move<false, false, random_access_iterator_tag>
316 : {
317 : template<typename _II, typename _OI>
318 : static _OI
319 0 : __copy_m(_II __first, _II __last, _OI __result)
320 : {
321 : typedef typename iterator_traits<_II>::difference_type _Distance;
322 0 : for(_Distance __n = __last - __first; __n > 0; --__n)
323 : {
324 0 : *__result = *__first;
325 0 : ++__first;
326 0 : ++__result;
327 : }
328 0 : return __result;
329 : }
330 : };
331 :
332 : #if __cplusplus >= 201103L
333 : template<>
334 : struct __copy_move<true, false, random_access_iterator_tag>
335 : {
336 : template<typename _II, typename _OI>
337 : static _OI
338 91 : __copy_m(_II __first, _II __last, _OI __result)
339 : {
340 : typedef typename iterator_traits<_II>::difference_type _Distance;
341 95 : for(_Distance __n = __last - __first; __n > 0; --__n)
342 : {
343 4 : *__result = std::move(*__first);
344 4 : ++__first;
345 4 : ++__result;
346 : }
347 91 : return __result;
348 : }
349 : };
350 : #endif
351 :
352 : template<bool _IsMove>
353 : struct __copy_move<_IsMove, true, random_access_iterator_tag>
354 : {
355 : template<typename _Tp>
356 : static _Tp*
357 968 : __copy_m(const _Tp* __first, const _Tp* __last, _Tp* __result)
358 : {
359 : #if __cplusplus >= 201103L
360 : using __assignable = conditional<_IsMove,
361 : is_move_assignable<_Tp>,
362 : is_copy_assignable<_Tp>>;
363 : // trivial types can have deleted assignment
364 : static_assert( __assignable::type::value, "type is not assignable" );
365 : #endif
366 968 : const ptrdiff_t _Num = __last - __first;
367 968 : if (_Num)
368 807 : __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);
369 968 : return __result + _Num;
370 : }
371 : };
372 :
373 : template<bool _IsMove, typename _II, typename _OI>
374 : inline _OI
375 1059 : __copy_move_a(_II __first, _II __last, _OI __result)
376 : {
377 : typedef typename iterator_traits<_II>::value_type _ValueTypeI;
378 : typedef typename iterator_traits<_OI>::value_type _ValueTypeO;
379 : typedef typename iterator_traits<_II>::iterator_category _Category;
380 1059 : const bool __simple = (__is_trivial(_ValueTypeI)
381 : && __is_pointer<_II>::__value
382 : && __is_pointer<_OI>::__value
383 : && __are_same<_ValueTypeI, _ValueTypeO>::__value);
384 :
385 : return std::__copy_move<_IsMove, __simple,
386 1059 : _Category>::__copy_m(__first, __last, __result);
387 : }
388 :
389 : // Helpers for streambuf iterators (either istream or ostream).
390 : // NB: avoid including <iosfwd>, relatively large.
391 : template<typename _CharT>
392 : struct char_traits;
393 :
394 : template<typename _CharT, typename _Traits>
395 : class istreambuf_iterator;
396 :
397 : template<typename _CharT, typename _Traits>
398 : class ostreambuf_iterator;
399 :
400 : template<bool _IsMove, typename _CharT>
401 : typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
402 : ostreambuf_iterator<_CharT, char_traits<_CharT> > >::__type
403 : __copy_move_a2(_CharT*, _CharT*,
404 : ostreambuf_iterator<_CharT, char_traits<_CharT> >);
405 :
406 : template<bool _IsMove, typename _CharT>
407 : typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
408 : ostreambuf_iterator<_CharT, char_traits<_CharT> > >::__type
409 : __copy_move_a2(const _CharT*, const _CharT*,
410 : ostreambuf_iterator<_CharT, char_traits<_CharT> >);
411 :
412 : template<bool _IsMove, typename _CharT>
413 : typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
414 : _CharT*>::__type
415 : __copy_move_a2(istreambuf_iterator<_CharT, char_traits<_CharT> >,
416 : istreambuf_iterator<_CharT, char_traits<_CharT> >, _CharT*);
417 :
418 : template<bool _IsMove, typename _II, typename _OI>
419 : inline _OI
420 1059 : __copy_move_a2(_II __first, _II __last, _OI __result)
421 : {
422 1059 : return _OI(std::__copy_move_a<_IsMove>(std::__niter_base(__first),
423 : std::__niter_base(__last),
424 1059 : std::__niter_base(__result)));
425 : }
426 :
427 : /**
428 : * @brief Copies the range [first,last) into result.
429 : * @ingroup mutating_algorithms
430 : * @param __first An input iterator.
431 : * @param __last An input iterator.
432 : * @param __result An output iterator.
433 : * @return result + (first - last)
434 : *
435 : * This inline function will boil down to a call to @c memmove whenever
436 : * possible. Failing that, if random access iterators are passed, then the
437 : * loop count will be known (and therefore a candidate for compiler
438 : * optimizations such as unrolling). Result may not be contained within
439 : * [first,last); the copy_backward function should be used instead.
440 : *
441 : * Note that the end of the output range is permitted to be contained
442 : * within [first,last).
443 : */
444 : template<typename _II, typename _OI>
445 : inline _OI
446 849 : copy(_II __first, _II __last, _OI __result)
447 : {
448 : // concept requirements
449 : __glibcxx_function_requires(_InputIteratorConcept<_II>)
450 : __glibcxx_function_requires(_OutputIteratorConcept<_OI,
451 : typename iterator_traits<_II>::value_type>)
452 : __glibcxx_requires_valid_range(__first, __last);
453 :
454 : return (std::__copy_move_a2<__is_move_iterator<_II>::__value>
455 849 : (std::__miter_base(__first), std::__miter_base(__last),
456 849 : __result));
457 : }
458 :
459 : #if __cplusplus >= 201103L
460 : /**
461 : * @brief Moves the range [first,last) into result.
462 : * @ingroup mutating_algorithms
463 : * @param __first An input iterator.
464 : * @param __last An input iterator.
465 : * @param __result An output iterator.
466 : * @return result + (first - last)
467 : *
468 : * This inline function will boil down to a call to @c memmove whenever
469 : * possible. Failing that, if random access iterators are passed, then the
470 : * loop count will be known (and therefore a candidate for compiler
471 : * optimizations such as unrolling). Result may not be contained within
472 : * [first,last); the move_backward function should be used instead.
473 : *
474 : * Note that the end of the output range is permitted to be contained
475 : * within [first,last).
476 : */
477 : template<typename _II, typename _OI>
478 : inline _OI
479 210 : move(_II __first, _II __last, _OI __result)
480 : {
481 : // concept requirements
482 : __glibcxx_function_requires(_InputIteratorConcept<_II>)
483 : __glibcxx_function_requires(_OutputIteratorConcept<_OI,
484 : typename iterator_traits<_II>::value_type>)
485 : __glibcxx_requires_valid_range(__first, __last);
486 :
487 210 : return std::__copy_move_a2<true>(std::__miter_base(__first),
488 210 : std::__miter_base(__last), __result);
489 : }
490 :
491 : #define _GLIBCXX_MOVE3(_Tp, _Up, _Vp) std::move(_Tp, _Up, _Vp)
492 : #else
493 : #define _GLIBCXX_MOVE3(_Tp, _Up, _Vp) std::copy(_Tp, _Up, _Vp)
494 : #endif
495 :
496 : template<bool, bool, typename>
497 : struct __copy_move_backward
498 : {
499 : template<typename _BI1, typename _BI2>
500 : static _BI2
501 : __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
502 : {
503 : while (__first != __last)
504 : *--__result = *--__last;
505 : return __result;
506 : }
507 : };
508 :
509 : #if __cplusplus >= 201103L
510 : template<typename _Category>
511 : struct __copy_move_backward<true, false, _Category>
512 : {
513 : template<typename _BI1, typename _BI2>
514 : static _BI2
515 : __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
516 : {
517 : while (__first != __last)
518 : *--__result = std::move(*--__last);
519 : return __result;
520 : }
521 : };
522 : #endif
523 :
524 : template<>
525 : struct __copy_move_backward<false, false, random_access_iterator_tag>
526 : {
527 : template<typename _BI1, typename _BI2>
528 : static _BI2
529 : __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
530 : {
531 : typename iterator_traits<_BI1>::difference_type __n;
532 : for (__n = __last - __first; __n > 0; --__n)
533 : *--__result = *--__last;
534 : return __result;
535 : }
536 : };
537 :
538 : #if __cplusplus >= 201103L
539 : template<>
540 : struct __copy_move_backward<true, false, random_access_iterator_tag>
541 : {
542 : template<typename _BI1, typename _BI2>
543 : static _BI2
544 3 : __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
545 : {
546 : typename iterator_traits<_BI1>::difference_type __n;
547 6 : for (__n = __last - __first; __n > 0; --__n)
548 3 : *--__result = std::move(*--__last);
549 3 : return __result;
550 : }
551 : };
552 : #endif
553 :
554 : template<bool _IsMove>
555 : struct __copy_move_backward<_IsMove, true, random_access_iterator_tag>
556 : {
557 : template<typename _Tp>
558 : static _Tp*
559 65 : __copy_move_b(const _Tp* __first, const _Tp* __last, _Tp* __result)
560 : {
561 : #if __cplusplus >= 201103L
562 : using __assignable = conditional<_IsMove,
563 : is_move_assignable<_Tp>,
564 : is_copy_assignable<_Tp>>;
565 : // trivial types can have deleted assignment
566 : static_assert( __assignable::type::value, "type is not assignable" );
567 : #endif
568 65 : const ptrdiff_t _Num = __last - __first;
569 65 : if (_Num)
570 24 : __builtin_memmove(__result - _Num, __first, sizeof(_Tp) * _Num);
571 65 : return __result - _Num;
572 : }
573 : };
574 :
575 : template<bool _IsMove, typename _BI1, typename _BI2>
576 : inline _BI2
577 68 : __copy_move_backward_a(_BI1 __first, _BI1 __last, _BI2 __result)
578 : {
579 : typedef typename iterator_traits<_BI1>::value_type _ValueType1;
580 : typedef typename iterator_traits<_BI2>::value_type _ValueType2;
581 : typedef typename iterator_traits<_BI1>::iterator_category _Category;
582 68 : const bool __simple = (__is_trivial(_ValueType1)
583 : && __is_pointer<_BI1>::__value
584 : && __is_pointer<_BI2>::__value
585 : && __are_same<_ValueType1, _ValueType2>::__value);
586 :
587 : return std::__copy_move_backward<_IsMove, __simple,
588 68 : _Category>::__copy_move_b(__first,
589 : __last,
590 68 : __result);
591 : }
592 :
593 : template<bool _IsMove, typename _BI1, typename _BI2>
594 : inline _BI2
595 68 : __copy_move_backward_a2(_BI1 __first, _BI1 __last, _BI2 __result)
596 : {
597 : return _BI2(std::__copy_move_backward_a<_IsMove>
598 68 : (std::__niter_base(__first), std::__niter_base(__last),
599 68 : std::__niter_base(__result)));
600 : }
601 :
602 : /**
603 : * @brief Copies the range [first,last) into result.
604 : * @ingroup mutating_algorithms
605 : * @param __first A bidirectional iterator.
606 : * @param __last A bidirectional iterator.
607 : * @param __result A bidirectional iterator.
608 : * @return result - (first - last)
609 : *
610 : * The function has the same effect as copy, but starts at the end of the
611 : * range and works its way to the start, returning the start of the result.
612 : * This inline function will boil down to a call to @c memmove whenever
613 : * possible. Failing that, if random access iterators are passed, then the
614 : * loop count will be known (and therefore a candidate for compiler
615 : * optimizations such as unrolling).
616 : *
617 : * Result may not be in the range (first,last]. Use copy instead. Note
618 : * that the start of the output range may overlap [first,last).
619 : */
620 : template<typename _BI1, typename _BI2>
621 : inline _BI2
622 0 : copy_backward(_BI1 __first, _BI1 __last, _BI2 __result)
623 : {
624 : // concept requirements
625 : __glibcxx_function_requires(_BidirectionalIteratorConcept<_BI1>)
626 : __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
627 : __glibcxx_function_requires(_ConvertibleConcept<
628 : typename iterator_traits<_BI1>::value_type,
629 : typename iterator_traits<_BI2>::value_type>)
630 : __glibcxx_requires_valid_range(__first, __last);
631 :
632 : return (std::__copy_move_backward_a2<__is_move_iterator<_BI1>::__value>
633 0 : (std::__miter_base(__first), std::__miter_base(__last),
634 0 : __result));
635 : }
636 :
637 : #if __cplusplus >= 201103L
638 : /**
639 : * @brief Moves the range [first,last) into result.
640 : * @ingroup mutating_algorithms
641 : * @param __first A bidirectional iterator.
642 : * @param __last A bidirectional iterator.
643 : * @param __result A bidirectional iterator.
644 : * @return result - (first - last)
645 : *
646 : * The function has the same effect as move, but starts at the end of the
647 : * range and works its way to the start, returning the start of the result.
648 : * This inline function will boil down to a call to @c memmove whenever
649 : * possible. Failing that, if random access iterators are passed, then the
650 : * loop count will be known (and therefore a candidate for compiler
651 : * optimizations such as unrolling).
652 : *
653 : * Result may not be in the range (first,last]. Use move instead. Note
654 : * that the start of the output range may overlap [first,last).
655 : */
656 : template<typename _BI1, typename _BI2>
657 : inline _BI2
658 68 : move_backward(_BI1 __first, _BI1 __last, _BI2 __result)
659 : {
660 : // concept requirements
661 : __glibcxx_function_requires(_BidirectionalIteratorConcept<_BI1>)
662 : __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
663 : __glibcxx_function_requires(_ConvertibleConcept<
664 : typename iterator_traits<_BI1>::value_type,
665 : typename iterator_traits<_BI2>::value_type>)
666 : __glibcxx_requires_valid_range(__first, __last);
667 :
668 68 : return std::__copy_move_backward_a2<true>(std::__miter_base(__first),
669 : std::__miter_base(__last),
670 68 : __result);
671 : }
672 :
673 : #define _GLIBCXX_MOVE_BACKWARD3(_Tp, _Up, _Vp) std::move_backward(_Tp, _Up, _Vp)
674 : #else
675 : #define _GLIBCXX_MOVE_BACKWARD3(_Tp, _Up, _Vp) std::copy_backward(_Tp, _Up, _Vp)
676 : #endif
677 :
678 : template<typename _ForwardIterator, typename _Tp>
679 : inline typename
680 : __gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, void>::__type
681 : __fill_a(_ForwardIterator __first, _ForwardIterator __last,
682 : const _Tp& __value)
683 : {
684 : for (; __first != __last; ++__first)
685 : *__first = __value;
686 : }
687 :
688 : template<typename _ForwardIterator, typename _Tp>
689 : inline typename
690 : __gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, void>::__type
691 121 : __fill_a(_ForwardIterator __first, _ForwardIterator __last,
692 : const _Tp& __value)
693 : {
694 121 : const _Tp __tmp = __value;
695 740 : for (; __first != __last; ++__first)
696 619 : *__first = __tmp;
697 121 : }
698 :
699 : // Specialization: for char types we can use memset.
700 : template<typename _Tp>
701 : inline typename
702 : __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, void>::__type
703 : __fill_a(_Tp* __first, _Tp* __last, const _Tp& __c)
704 : {
705 : const _Tp __tmp = __c;
706 : if (const size_t __len = __last - __first)
707 : __builtin_memset(__first, static_cast<unsigned char>(__tmp), __len);
708 : }
709 :
710 : /**
711 : * @brief Fills the range [first,last) with copies of value.
712 : * @ingroup mutating_algorithms
713 : * @param __first A forward iterator.
714 : * @param __last A forward iterator.
715 : * @param __value A reference-to-const of arbitrary type.
716 : * @return Nothing.
717 : *
718 : * This function fills a range with copies of the same value. For char
719 : * types filling contiguous areas of memory, this becomes an inline call
720 : * to @c memset or @c wmemset.
721 : */
722 : template<typename _ForwardIterator, typename _Tp>
723 : inline void
724 121 : fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value)
725 : {
726 : // concept requirements
727 : __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
728 : _ForwardIterator>)
729 : __glibcxx_requires_valid_range(__first, __last);
730 :
731 121 : std::__fill_a(std::__niter_base(__first), std::__niter_base(__last),
732 : __value);
733 121 : }
734 :
735 : template<typename _OutputIterator, typename _Size, typename _Tp>
736 : inline typename
737 : __gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, _OutputIterator>::__type
738 1073 : __fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value)
739 : {
740 1073 : for (__decltype(__n + 0) __niter = __n;
741 2945 : __niter > 0; --__niter, (void) ++__first)
742 1872 : *__first = __value;
743 1073 : return __first;
744 : }
745 :
746 : template<typename _OutputIterator, typename _Size, typename _Tp>
747 : inline typename
748 : __gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, _OutputIterator>::__type
749 2989 : __fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value)
750 : {
751 2989 : const _Tp __tmp = __value;
752 2989 : for (__decltype(__n + 0) __niter = __n;
753 84093 : __niter > 0; --__niter, (void) ++__first)
754 81104 : *__first = __tmp;
755 2989 : return __first;
756 : }
757 :
758 : template<typename _Size, typename _Tp>
759 : inline typename
760 : __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, _Tp*>::__type
761 : __fill_n_a(_Tp* __first, _Size __n, const _Tp& __c)
762 : {
763 : std::__fill_a(__first, __first + __n, __c);
764 : return __first + __n;
765 : }
766 :
767 : /**
768 : * @brief Fills the range [first,first+n) with copies of value.
769 : * @ingroup mutating_algorithms
770 : * @param __first An output iterator.
771 : * @param __n The count of copies to perform.
772 : * @param __value A reference-to-const of arbitrary type.
773 : * @return The iterator at first+n.
774 : *
775 : * This function fills a range with copies of the same value. For char
776 : * types filling contiguous areas of memory, this becomes an inline call
777 : * to @c memset or @ wmemset.
778 : *
779 : * _GLIBCXX_RESOLVE_LIB_DEFECTS
780 : * DR 865. More algorithms that throw away information
781 : */
782 : template<typename _OI, typename _Size, typename _Tp>
783 : inline _OI
784 4062 : fill_n(_OI __first, _Size __n, const _Tp& __value)
785 : {
786 : // concept requirements
787 : __glibcxx_function_requires(_OutputIteratorConcept<_OI, _Tp>)
788 :
789 4062 : return _OI(std::__fill_n_a(std::__niter_base(__first), __n, __value));
790 : }
791 :
792 : template<bool _BoolType>
793 : struct __equal
794 : {
795 : template<typename _II1, typename _II2>
796 : static bool
797 : equal(_II1 __first1, _II1 __last1, _II2 __first2)
798 : {
799 : for (; __first1 != __last1; ++__first1, (void) ++__first2)
800 : if (!(*__first1 == *__first2))
801 : return false;
802 : return true;
803 : }
804 : };
805 :
806 : template<>
807 : struct __equal<true>
808 : {
809 : template<typename _Tp>
810 : static bool
811 : equal(const _Tp* __first1, const _Tp* __last1, const _Tp* __first2)
812 : {
813 : if (const size_t __len = (__last1 - __first1))
814 : return !__builtin_memcmp(__first1, __first2, sizeof(_Tp) * __len);
815 : return true;
816 : }
817 : };
818 :
819 : template<typename _II1, typename _II2>
820 : inline bool
821 : __equal_aux(_II1 __first1, _II1 __last1, _II2 __first2)
822 : {
823 : typedef typename iterator_traits<_II1>::value_type _ValueType1;
824 : typedef typename iterator_traits<_II2>::value_type _ValueType2;
825 : const bool __simple = ((__is_integer<_ValueType1>::__value
826 : || __is_pointer<_ValueType1>::__value)
827 : && __is_pointer<_II1>::__value
828 : && __is_pointer<_II2>::__value
829 : && __are_same<_ValueType1, _ValueType2>::__value);
830 :
831 : return std::__equal<__simple>::equal(__first1, __last1, __first2);
832 : }
833 :
834 : template<typename, typename>
835 : struct __lc_rai
836 : {
837 : template<typename _II1, typename _II2>
838 : static _II1
839 : __newlast1(_II1, _II1 __last1, _II2, _II2)
840 : { return __last1; }
841 :
842 : template<typename _II>
843 : static bool
844 : __cnd2(_II __first, _II __last)
845 : { return __first != __last; }
846 : };
847 :
848 : template<>
849 : struct __lc_rai<random_access_iterator_tag, random_access_iterator_tag>
850 : {
851 : template<typename _RAI1, typename _RAI2>
852 : static _RAI1
853 : __newlast1(_RAI1 __first1, _RAI1 __last1,
854 : _RAI2 __first2, _RAI2 __last2)
855 : {
856 : const typename iterator_traits<_RAI1>::difference_type
857 : __diff1 = __last1 - __first1;
858 : const typename iterator_traits<_RAI2>::difference_type
859 : __diff2 = __last2 - __first2;
860 : return __diff2 < __diff1 ? __first1 + __diff2 : __last1;
861 : }
862 :
863 : template<typename _RAI>
864 : static bool
865 : __cnd2(_RAI, _RAI)
866 : { return true; }
867 : };
868 :
869 : template<typename _II1, typename _II2, typename _Compare>
870 : bool
871 : __lexicographical_compare_impl(_II1 __first1, _II1 __last1,
872 : _II2 __first2, _II2 __last2,
873 : _Compare __comp)
874 : {
875 : typedef typename iterator_traits<_II1>::iterator_category _Category1;
876 : typedef typename iterator_traits<_II2>::iterator_category _Category2;
877 : typedef std::__lc_rai<_Category1, _Category2> __rai_type;
878 :
879 : __last1 = __rai_type::__newlast1(__first1, __last1, __first2, __last2);
880 : for (; __first1 != __last1 && __rai_type::__cnd2(__first2, __last2);
881 : ++__first1, (void)++__first2)
882 : {
883 : if (__comp(__first1, __first2))
884 : return true;
885 : if (__comp(__first2, __first1))
886 : return false;
887 : }
888 : return __first1 == __last1 && __first2 != __last2;
889 : }
890 :
891 : template<bool _BoolType>
892 : struct __lexicographical_compare
893 : {
894 : template<typename _II1, typename _II2>
895 : static bool __lc(_II1, _II1, _II2, _II2);
896 : };
897 :
898 : template<bool _BoolType>
899 : template<typename _II1, typename _II2>
900 : bool
901 : __lexicographical_compare<_BoolType>::
902 : __lc(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
903 : {
904 : return std::__lexicographical_compare_impl(__first1, __last1,
905 : __first2, __last2,
906 : __gnu_cxx::__ops::__iter_less_iter());
907 : }
908 :
909 : template<>
910 : struct __lexicographical_compare<true>
911 : {
912 : template<typename _Tp, typename _Up>
913 : static bool
914 : __lc(const _Tp* __first1, const _Tp* __last1,
915 : const _Up* __first2, const _Up* __last2)
916 : {
917 : const size_t __len1 = __last1 - __first1;
918 : const size_t __len2 = __last2 - __first2;
919 : if (const size_t __len = std::min(__len1, __len2))
920 : if (int __result = __builtin_memcmp(__first1, __first2, __len))
921 : return __result < 0;
922 : return __len1 < __len2;
923 : }
924 : };
925 :
926 : template<typename _II1, typename _II2>
927 : inline bool
928 : __lexicographical_compare_aux(_II1 __first1, _II1 __last1,
929 : _II2 __first2, _II2 __last2)
930 : {
931 : typedef typename iterator_traits<_II1>::value_type _ValueType1;
932 : typedef typename iterator_traits<_II2>::value_type _ValueType2;
933 : const bool __simple =
934 : (__is_byte<_ValueType1>::__value && __is_byte<_ValueType2>::__value
935 : && !__gnu_cxx::__numeric_traits<_ValueType1>::__is_signed
936 : && !__gnu_cxx::__numeric_traits<_ValueType2>::__is_signed
937 : && __is_pointer<_II1>::__value
938 : && __is_pointer<_II2>::__value);
939 :
940 : return std::__lexicographical_compare<__simple>::__lc(__first1, __last1,
941 : __first2, __last2);
942 : }
943 :
944 : template<typename _ForwardIterator, typename _Tp, typename _Compare>
945 : _ForwardIterator
946 : __lower_bound(_ForwardIterator __first, _ForwardIterator __last,
947 : const _Tp& __val, _Compare __comp)
948 : {
949 : typedef typename iterator_traits<_ForwardIterator>::difference_type
950 : _DistanceType;
951 :
952 : _DistanceType __len = std::distance(__first, __last);
953 :
954 : while (__len > 0)
955 : {
956 : _DistanceType __half = __len >> 1;
957 : _ForwardIterator __middle = __first;
958 : std::advance(__middle, __half);
959 : if (__comp(__middle, __val))
960 : {
961 : __first = __middle;
962 : ++__first;
963 : __len = __len - __half - 1;
964 : }
965 : else
966 : __len = __half;
967 : }
968 : return __first;
969 : }
970 :
971 : /**
972 : * @brief Finds the first position in which @a val could be inserted
973 : * without changing the ordering.
974 : * @param __first An iterator.
975 : * @param __last Another iterator.
976 : * @param __val The search term.
977 : * @return An iterator pointing to the first element <em>not less
978 : * than</em> @a val, or end() if every element is less than
979 : * @a val.
980 : * @ingroup binary_search_algorithms
981 : */
982 : template<typename _ForwardIterator, typename _Tp>
983 : inline _ForwardIterator
984 : lower_bound(_ForwardIterator __first, _ForwardIterator __last,
985 : const _Tp& __val)
986 : {
987 : // concept requirements
988 : __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
989 : __glibcxx_function_requires(_LessThanOpConcept<
990 : typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
991 : __glibcxx_requires_partitioned_lower(__first, __last, __val);
992 :
993 : return std::__lower_bound(__first, __last, __val,
994 : __gnu_cxx::__ops::__iter_less_val());
995 : }
996 :
997 : /// This is a helper function for the sort routines and for random.tcc.
998 : // Precondition: __n > 0.
999 : inline _GLIBCXX_CONSTEXPR int
1000 : __lg(int __n)
1001 : { return (int)sizeof(int) * __CHAR_BIT__ - 1 - __builtin_clz(__n); }
1002 :
1003 : inline _GLIBCXX_CONSTEXPR unsigned
1004 : __lg(unsigned __n)
1005 : { return (int)sizeof(int) * __CHAR_BIT__ - 1 - __builtin_clz(__n); }
1006 :
1007 : inline _GLIBCXX_CONSTEXPR long
1008 207 : __lg(long __n)
1009 207 : { return (int)sizeof(long) * __CHAR_BIT__ - 1 - __builtin_clzl(__n); }
1010 :
1011 : inline _GLIBCXX_CONSTEXPR unsigned long
1012 : __lg(unsigned long __n)
1013 : { return (int)sizeof(long) * __CHAR_BIT__ - 1 - __builtin_clzl(__n); }
1014 :
1015 : inline _GLIBCXX_CONSTEXPR long long
1016 : __lg(long long __n)
1017 : { return (int)sizeof(long long) * __CHAR_BIT__ - 1 - __builtin_clzll(__n); }
1018 :
1019 : inline _GLIBCXX_CONSTEXPR unsigned long long
1020 : __lg(unsigned long long __n)
1021 : { return (int)sizeof(long long) * __CHAR_BIT__ - 1 - __builtin_clzll(__n); }
1022 :
1023 : _GLIBCXX_BEGIN_NAMESPACE_ALGO
1024 :
1025 : /**
1026 : * @brief Tests a range for element-wise equality.
1027 : * @ingroup non_mutating_algorithms
1028 : * @param __first1 An input iterator.
1029 : * @param __last1 An input iterator.
1030 : * @param __first2 An input iterator.
1031 : * @return A boolean true or false.
1032 : *
1033 : * This compares the elements of two ranges using @c == and returns true or
1034 : * false depending on whether all of the corresponding elements of the
1035 : * ranges are equal.
1036 : */
1037 : template<typename _II1, typename _II2>
1038 : inline bool
1039 : equal(_II1 __first1, _II1 __last1, _II2 __first2)
1040 : {
1041 : // concept requirements
1042 : __glibcxx_function_requires(_InputIteratorConcept<_II1>)
1043 : __glibcxx_function_requires(_InputIteratorConcept<_II2>)
1044 : __glibcxx_function_requires(_EqualOpConcept<
1045 : typename iterator_traits<_II1>::value_type,
1046 : typename iterator_traits<_II2>::value_type>)
1047 : __glibcxx_requires_valid_range(__first1, __last1);
1048 :
1049 : return std::__equal_aux(std::__niter_base(__first1),
1050 : std::__niter_base(__last1),
1051 : std::__niter_base(__first2));
1052 : }
1053 :
1054 : /**
1055 : * @brief Tests a range for element-wise equality.
1056 : * @ingroup non_mutating_algorithms
1057 : * @param __first1 An input iterator.
1058 : * @param __last1 An input iterator.
1059 : * @param __first2 An input iterator.
1060 : * @param __binary_pred A binary predicate @link functors
1061 : * functor@endlink.
1062 : * @return A boolean true or false.
1063 : *
1064 : * This compares the elements of two ranges using the binary_pred
1065 : * parameter, and returns true or
1066 : * false depending on whether all of the corresponding elements of the
1067 : * ranges are equal.
1068 : */
1069 : template<typename _IIter1, typename _IIter2, typename _BinaryPredicate>
1070 : inline bool
1071 : equal(_IIter1 __first1, _IIter1 __last1,
1072 : _IIter2 __first2, _BinaryPredicate __binary_pred)
1073 : {
1074 : // concept requirements
1075 : __glibcxx_function_requires(_InputIteratorConcept<_IIter1>)
1076 : __glibcxx_function_requires(_InputIteratorConcept<_IIter2>)
1077 : __glibcxx_requires_valid_range(__first1, __last1);
1078 :
1079 : for (; __first1 != __last1; ++__first1, (void)++__first2)
1080 : if (!bool(__binary_pred(*__first1, *__first2)))
1081 : return false;
1082 : return true;
1083 : }
1084 :
1085 : #if __cplusplus >= 201103L
1086 : // 4-iterator version of std::equal<It1, It2> for use in C++11.
1087 : template<typename _II1, typename _II2>
1088 : inline bool
1089 : __equal4(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
1090 : {
1091 : using _RATag = random_access_iterator_tag;
1092 : using _Cat1 = typename iterator_traits<_II1>::iterator_category;
1093 : using _Cat2 = typename iterator_traits<_II2>::iterator_category;
1094 : using _RAIters = __and_<is_same<_Cat1, _RATag>, is_same<_Cat2, _RATag>>;
1095 : if (_RAIters())
1096 : {
1097 : auto __d1 = std::distance(__first1, __last1);
1098 : auto __d2 = std::distance(__first2, __last2);
1099 : if (__d1 != __d2)
1100 : return false;
1101 : return _GLIBCXX_STD_A::equal(__first1, __last1, __first2);
1102 : }
1103 :
1104 : for (; __first1 != __last1 && __first2 != __last2;
1105 : ++__first1, (void)++__first2)
1106 : if (!(*__first1 == *__first2))
1107 : return false;
1108 : return __first1 == __last1 && __first2 == __last2;
1109 : }
1110 :
1111 : // 4-iterator version of std::equal<It1, It2, BinaryPred> for use in C++11.
1112 : template<typename _II1, typename _II2, typename _BinaryPredicate>
1113 : inline bool
1114 : __equal4(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2,
1115 : _BinaryPredicate __binary_pred)
1116 : {
1117 : using _RATag = random_access_iterator_tag;
1118 : using _Cat1 = typename iterator_traits<_II1>::iterator_category;
1119 : using _Cat2 = typename iterator_traits<_II2>::iterator_category;
1120 : using _RAIters = __and_<is_same<_Cat1, _RATag>, is_same<_Cat2, _RATag>>;
1121 : if (_RAIters())
1122 : {
1123 : auto __d1 = std::distance(__first1, __last1);
1124 : auto __d2 = std::distance(__first2, __last2);
1125 : if (__d1 != __d2)
1126 : return false;
1127 : return _GLIBCXX_STD_A::equal(__first1, __last1, __first2,
1128 : __binary_pred);
1129 : }
1130 :
1131 : for (; __first1 != __last1 && __first2 != __last2;
1132 : ++__first1, (void)++__first2)
1133 : if (!bool(__binary_pred(*__first1, *__first2)))
1134 : return false;
1135 : return __first1 == __last1 && __first2 == __last2;
1136 : }
1137 : #endif // C++11
1138 :
1139 : #if __cplusplus > 201103L
1140 :
1141 : #define __cpp_lib_robust_nonmodifying_seq_ops 201304
1142 :
1143 : /**
1144 : * @brief Tests a range for element-wise equality.
1145 : * @ingroup non_mutating_algorithms
1146 : * @param __first1 An input iterator.
1147 : * @param __last1 An input iterator.
1148 : * @param __first2 An input iterator.
1149 : * @param __last2 An input iterator.
1150 : * @return A boolean true or false.
1151 : *
1152 : * This compares the elements of two ranges using @c == and returns true or
1153 : * false depending on whether all of the corresponding elements of the
1154 : * ranges are equal.
1155 : */
1156 : template<typename _II1, typename _II2>
1157 : inline bool
1158 : equal(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
1159 : {
1160 : // concept requirements
1161 : __glibcxx_function_requires(_InputIteratorConcept<_II1>)
1162 : __glibcxx_function_requires(_InputIteratorConcept<_II2>)
1163 : __glibcxx_function_requires(_EqualOpConcept<
1164 : typename iterator_traits<_II1>::value_type,
1165 : typename iterator_traits<_II2>::value_type>)
1166 : __glibcxx_requires_valid_range(__first1, __last1);
1167 : __glibcxx_requires_valid_range(__first2, __last2);
1168 :
1169 : return _GLIBCXX_STD_A::__equal4(__first1, __last1, __first2, __last2);
1170 : }
1171 :
1172 : /**
1173 : * @brief Tests a range for element-wise equality.
1174 : * @ingroup non_mutating_algorithms
1175 : * @param __first1 An input iterator.
1176 : * @param __last1 An input iterator.
1177 : * @param __first2 An input iterator.
1178 : * @param __last2 An input iterator.
1179 : * @param __binary_pred A binary predicate @link functors
1180 : * functor@endlink.
1181 : * @return A boolean true or false.
1182 : *
1183 : * This compares the elements of two ranges using the binary_pred
1184 : * parameter, and returns true or
1185 : * false depending on whether all of the corresponding elements of the
1186 : * ranges are equal.
1187 : */
1188 : template<typename _IIter1, typename _IIter2, typename _BinaryPredicate>
1189 : inline bool
1190 : equal(_IIter1 __first1, _IIter1 __last1,
1191 : _IIter2 __first2, _IIter2 __last2, _BinaryPredicate __binary_pred)
1192 : {
1193 : // concept requirements
1194 : __glibcxx_function_requires(_InputIteratorConcept<_IIter1>)
1195 : __glibcxx_function_requires(_InputIteratorConcept<_IIter2>)
1196 : __glibcxx_requires_valid_range(__first1, __last1);
1197 : __glibcxx_requires_valid_range(__first2, __last2);
1198 :
1199 : return _GLIBCXX_STD_A::__equal4(__first1, __last1, __first2, __last2,
1200 : __binary_pred);
1201 : }
1202 : #endif // C++14
1203 :
1204 : /**
1205 : * @brief Performs @b dictionary comparison on ranges.
1206 : * @ingroup sorting_algorithms
1207 : * @param __first1 An input iterator.
1208 : * @param __last1 An input iterator.
1209 : * @param __first2 An input iterator.
1210 : * @param __last2 An input iterator.
1211 : * @return A boolean true or false.
1212 : *
1213 : * <em>Returns true if the sequence of elements defined by the range
1214 : * [first1,last1) is lexicographically less than the sequence of elements
1215 : * defined by the range [first2,last2). Returns false otherwise.</em>
1216 : * (Quoted from [25.3.8]/1.) If the iterators are all character pointers,
1217 : * then this is an inline call to @c memcmp.
1218 : */
1219 : template<typename _II1, typename _II2>
1220 : inline bool
1221 : lexicographical_compare(_II1 __first1, _II1 __last1,
1222 : _II2 __first2, _II2 __last2)
1223 : {
1224 : #ifdef _GLIBCXX_CONCEPT_CHECKS
1225 : // concept requirements
1226 : typedef typename iterator_traits<_II1>::value_type _ValueType1;
1227 : typedef typename iterator_traits<_II2>::value_type _ValueType2;
1228 : #endif
1229 : __glibcxx_function_requires(_InputIteratorConcept<_II1>)
1230 : __glibcxx_function_requires(_InputIteratorConcept<_II2>)
1231 : __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
1232 : __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
1233 : __glibcxx_requires_valid_range(__first1, __last1);
1234 : __glibcxx_requires_valid_range(__first2, __last2);
1235 :
1236 : return std::__lexicographical_compare_aux(std::__niter_base(__first1),
1237 : std::__niter_base(__last1),
1238 : std::__niter_base(__first2),
1239 : std::__niter_base(__last2));
1240 : }
1241 :
1242 : /**
1243 : * @brief Performs @b dictionary comparison on ranges.
1244 : * @ingroup sorting_algorithms
1245 : * @param __first1 An input iterator.
1246 : * @param __last1 An input iterator.
1247 : * @param __first2 An input iterator.
1248 : * @param __last2 An input iterator.
1249 : * @param __comp A @link comparison_functors comparison functor@endlink.
1250 : * @return A boolean true or false.
1251 : *
1252 : * The same as the four-parameter @c lexicographical_compare, but uses the
1253 : * comp parameter instead of @c <.
1254 : */
1255 : template<typename _II1, typename _II2, typename _Compare>
1256 : inline bool
1257 : lexicographical_compare(_II1 __first1, _II1 __last1,
1258 : _II2 __first2, _II2 __last2, _Compare __comp)
1259 : {
1260 : // concept requirements
1261 : __glibcxx_function_requires(_InputIteratorConcept<_II1>)
1262 : __glibcxx_function_requires(_InputIteratorConcept<_II2>)
1263 : __glibcxx_requires_valid_range(__first1, __last1);
1264 : __glibcxx_requires_valid_range(__first2, __last2);
1265 :
1266 : return std::__lexicographical_compare_impl
1267 : (__first1, __last1, __first2, __last2,
1268 : __gnu_cxx::__ops::__iter_comp_iter(__comp));
1269 : }
1270 :
1271 : template<typename _InputIterator1, typename _InputIterator2,
1272 : typename _BinaryPredicate>
1273 : pair<_InputIterator1, _InputIterator2>
1274 : __mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
1275 : _InputIterator2 __first2, _BinaryPredicate __binary_pred)
1276 : {
1277 : while (__first1 != __last1 && __binary_pred(__first1, __first2))
1278 : {
1279 : ++__first1;
1280 : ++__first2;
1281 : }
1282 : return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
1283 : }
1284 :
1285 : /**
1286 : * @brief Finds the places in ranges which don't match.
1287 : * @ingroup non_mutating_algorithms
1288 : * @param __first1 An input iterator.
1289 : * @param __last1 An input iterator.
1290 : * @param __first2 An input iterator.
1291 : * @return A pair of iterators pointing to the first mismatch.
1292 : *
1293 : * This compares the elements of two ranges using @c == and returns a pair
1294 : * of iterators. The first iterator points into the first range, the
1295 : * second iterator points into the second range, and the elements pointed
1296 : * to by the iterators are not equal.
1297 : */
1298 : template<typename _InputIterator1, typename _InputIterator2>
1299 : inline pair<_InputIterator1, _InputIterator2>
1300 : mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
1301 : _InputIterator2 __first2)
1302 : {
1303 : // concept requirements
1304 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
1305 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
1306 : __glibcxx_function_requires(_EqualOpConcept<
1307 : typename iterator_traits<_InputIterator1>::value_type,
1308 : typename iterator_traits<_InputIterator2>::value_type>)
1309 : __glibcxx_requires_valid_range(__first1, __last1);
1310 :
1311 : return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2,
1312 : __gnu_cxx::__ops::__iter_equal_to_iter());
1313 : }
1314 :
1315 : /**
1316 : * @brief Finds the places in ranges which don't match.
1317 : * @ingroup non_mutating_algorithms
1318 : * @param __first1 An input iterator.
1319 : * @param __last1 An input iterator.
1320 : * @param __first2 An input iterator.
1321 : * @param __binary_pred A binary predicate @link functors
1322 : * functor@endlink.
1323 : * @return A pair of iterators pointing to the first mismatch.
1324 : *
1325 : * This compares the elements of two ranges using the binary_pred
1326 : * parameter, and returns a pair
1327 : * of iterators. The first iterator points into the first range, the
1328 : * second iterator points into the second range, and the elements pointed
1329 : * to by the iterators are not equal.
1330 : */
1331 : template<typename _InputIterator1, typename _InputIterator2,
1332 : typename _BinaryPredicate>
1333 : inline pair<_InputIterator1, _InputIterator2>
1334 : mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
1335 : _InputIterator2 __first2, _BinaryPredicate __binary_pred)
1336 : {
1337 : // concept requirements
1338 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
1339 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
1340 : __glibcxx_requires_valid_range(__first1, __last1);
1341 :
1342 : return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2,
1343 : __gnu_cxx::__ops::__iter_comp_iter(__binary_pred));
1344 : }
1345 :
1346 : #if __cplusplus > 201103L
1347 :
1348 : template<typename _InputIterator1, typename _InputIterator2,
1349 : typename _BinaryPredicate>
1350 : pair<_InputIterator1, _InputIterator2>
1351 : __mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
1352 : _InputIterator2 __first2, _InputIterator2 __last2,
1353 : _BinaryPredicate __binary_pred)
1354 : {
1355 : while (__first1 != __last1 && __first2 != __last2
1356 : && __binary_pred(__first1, __first2))
1357 : {
1358 : ++__first1;
1359 : ++__first2;
1360 : }
1361 : return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
1362 : }
1363 :
1364 : /**
1365 : * @brief Finds the places in ranges which don't match.
1366 : * @ingroup non_mutating_algorithms
1367 : * @param __first1 An input iterator.
1368 : * @param __last1 An input iterator.
1369 : * @param __first2 An input iterator.
1370 : * @param __last2 An input iterator.
1371 : * @return A pair of iterators pointing to the first mismatch.
1372 : *
1373 : * This compares the elements of two ranges using @c == and returns a pair
1374 : * of iterators. The first iterator points into the first range, the
1375 : * second iterator points into the second range, and the elements pointed
1376 : * to by the iterators are not equal.
1377 : */
1378 : template<typename _InputIterator1, typename _InputIterator2>
1379 : inline pair<_InputIterator1, _InputIterator2>
1380 : mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
1381 : _InputIterator2 __first2, _InputIterator2 __last2)
1382 : {
1383 : // concept requirements
1384 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
1385 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
1386 : __glibcxx_function_requires(_EqualOpConcept<
1387 : typename iterator_traits<_InputIterator1>::value_type,
1388 : typename iterator_traits<_InputIterator2>::value_type>)
1389 : __glibcxx_requires_valid_range(__first1, __last1);
1390 : __glibcxx_requires_valid_range(__first2, __last2);
1391 :
1392 : return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2, __last2,
1393 : __gnu_cxx::__ops::__iter_equal_to_iter());
1394 : }
1395 :
1396 : /**
1397 : * @brief Finds the places in ranges which don't match.
1398 : * @ingroup non_mutating_algorithms
1399 : * @param __first1 An input iterator.
1400 : * @param __last1 An input iterator.
1401 : * @param __first2 An input iterator.
1402 : * @param __last2 An input iterator.
1403 : * @param __binary_pred A binary predicate @link functors
1404 : * functor@endlink.
1405 : * @return A pair of iterators pointing to the first mismatch.
1406 : *
1407 : * This compares the elements of two ranges using the binary_pred
1408 : * parameter, and returns a pair
1409 : * of iterators. The first iterator points into the first range, the
1410 : * second iterator points into the second range, and the elements pointed
1411 : * to by the iterators are not equal.
1412 : */
1413 : template<typename _InputIterator1, typename _InputIterator2,
1414 : typename _BinaryPredicate>
1415 : inline pair<_InputIterator1, _InputIterator2>
1416 : mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
1417 : _InputIterator2 __first2, _InputIterator2 __last2,
1418 : _BinaryPredicate __binary_pred)
1419 : {
1420 : // concept requirements
1421 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
1422 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
1423 : __glibcxx_requires_valid_range(__first1, __last1);
1424 : __glibcxx_requires_valid_range(__first2, __last2);
1425 :
1426 : return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2, __last2,
1427 : __gnu_cxx::__ops::__iter_comp_iter(__binary_pred));
1428 : }
1429 : #endif
1430 :
1431 : _GLIBCXX_END_NAMESPACE_ALGO
1432 : _GLIBCXX_END_NAMESPACE_VERSION
1433 : } // namespace std
1434 :
1435 : // NB: This file is included within many other C++ includes, as a way
1436 : // of getting the base algorithms. So, make sure that parallel bits
1437 : // come in too if requested.
1438 : #ifdef _GLIBCXX_PARALLEL
1439 : # include <parallel/algobase.h>
1440 : #endif
1441 :
1442 : #endif
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