Line data Source code
1 : // Core algorithmic facilities -*- C++ -*-
2 :
3 : // Copyright (C) 2001-2014 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 and _GLIBCXX_MOVE
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 = _GLIBCXX_MOVE(*__a);
91 : *__a = _GLIBCXX_MOVE(*__b);
92 : *__b = _GLIBCXX_MOVE(__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 0 : 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 0 : swap(*__a, *__b);
149 : #endif
150 0 : }
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, ++__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 : inline const _Tp&
194 0 : min(const _Tp& __a, const _Tp& __b)
195 : {
196 : // concept requirements
197 : __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
198 : //return __b < __a ? __b : __a;
199 0 : if (__b < __a)
200 0 : return __b;
201 0 : return __a;
202 : }
203 :
204 : /**
205 : * @brief This does what you think it does.
206 : * @ingroup sorting_algorithms
207 : * @param __a A thing of arbitrary type.
208 : * @param __b Another thing of arbitrary type.
209 : * @return The greater of the parameters.
210 : *
211 : * This is the simple classic generic implementation. It will work on
212 : * temporary expressions, since they are only evaluated once, unlike a
213 : * preprocessor macro.
214 : */
215 : template<typename _Tp>
216 : inline const _Tp&
217 71 : max(const _Tp& __a, const _Tp& __b)
218 : {
219 : // concept requirements
220 : __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
221 : //return __a < __b ? __b : __a;
222 71 : if (__a < __b)
223 60 : return __b;
224 11 : return __a;
225 : }
226 :
227 : /**
228 : * @brief This does what you think it does.
229 : * @ingroup sorting_algorithms
230 : * @param __a A thing of arbitrary type.
231 : * @param __b Another thing of arbitrary type.
232 : * @param __comp A @link comparison_functors comparison functor@endlink.
233 : * @return The lesser of the parameters.
234 : *
235 : * This will work on temporary expressions, since they are only evaluated
236 : * once, unlike a preprocessor macro.
237 : */
238 : template<typename _Tp, typename _Compare>
239 : inline const _Tp&
240 : min(const _Tp& __a, const _Tp& __b, _Compare __comp)
241 : {
242 : //return __comp(__b, __a) ? __b : __a;
243 : if (__comp(__b, __a))
244 : return __b;
245 : return __a;
246 : }
247 :
248 : /**
249 : * @brief This does what you think it does.
250 : * @ingroup sorting_algorithms
251 : * @param __a A thing of arbitrary type.
252 : * @param __b Another thing of arbitrary type.
253 : * @param __comp A @link comparison_functors comparison functor@endlink.
254 : * @return The greater of the parameters.
255 : *
256 : * This will work on temporary expressions, since they are only evaluated
257 : * once, unlike a preprocessor macro.
258 : */
259 : template<typename _Tp, typename _Compare>
260 : inline const _Tp&
261 : max(const _Tp& __a, const _Tp& __b, _Compare __comp)
262 : {
263 : //return __comp(__a, __b) ? __b : __a;
264 : if (__comp(__a, __b))
265 : return __b;
266 : return __a;
267 : }
268 :
269 : // If _Iterator is a __normal_iterator return its base (a plain pointer,
270 : // normally) otherwise return it untouched. See copy, fill, ...
271 : template<typename _Iterator>
272 : struct _Niter_base
273 : : _Iter_base<_Iterator, __is_normal_iterator<_Iterator>::__value>
274 : { };
275 :
276 : template<typename _Iterator>
277 : inline typename _Niter_base<_Iterator>::iterator_type
278 12 : __niter_base(_Iterator __it)
279 12 : { return std::_Niter_base<_Iterator>::_S_base(__it); }
280 :
281 : // Likewise, for move_iterator.
282 : template<typename _Iterator>
283 : struct _Miter_base
284 : : _Iter_base<_Iterator, __is_move_iterator<_Iterator>::__value>
285 : { };
286 :
287 : template<typename _Iterator>
288 : inline typename _Miter_base<_Iterator>::iterator_type
289 8 : __miter_base(_Iterator __it)
290 8 : { return std::_Miter_base<_Iterator>::_S_base(__it); }
291 :
292 : // All of these auxiliary structs serve two purposes. (1) Replace
293 : // calls to copy with memmove whenever possible. (Memmove, not memcpy,
294 : // because the input and output ranges are permitted to overlap.)
295 : // (2) If we're using random access iterators, then write the loop as
296 : // a for loop with an explicit count.
297 :
298 : template<bool, bool, typename>
299 : struct __copy_move
300 : {
301 : template<typename _II, typename _OI>
302 : static _OI
303 : __copy_m(_II __first, _II __last, _OI __result)
304 : {
305 : for (; __first != __last; ++__result, ++__first)
306 : *__result = *__first;
307 : return __result;
308 : }
309 : };
310 :
311 : #if __cplusplus >= 201103L
312 : template<typename _Category>
313 : struct __copy_move<true, false, _Category>
314 : {
315 : template<typename _II, typename _OI>
316 : static _OI
317 : __copy_m(_II __first, _II __last, _OI __result)
318 : {
319 : for (; __first != __last; ++__result, ++__first)
320 : *__result = std::move(*__first);
321 : return __result;
322 : }
323 : };
324 : #endif
325 :
326 : template<>
327 : struct __copy_move<false, false, random_access_iterator_tag>
328 : {
329 : template<typename _II, typename _OI>
330 : static _OI
331 3 : __copy_m(_II __first, _II __last, _OI __result)
332 : {
333 : typedef typename iterator_traits<_II>::difference_type _Distance;
334 6 : for(_Distance __n = __last - __first; __n > 0; --__n)
335 : {
336 3 : *__result = *__first;
337 3 : ++__first;
338 3 : ++__result;
339 : }
340 3 : return __result;
341 : }
342 : };
343 :
344 : #if __cplusplus >= 201103L
345 : template<>
346 : struct __copy_move<true, false, random_access_iterator_tag>
347 : {
348 : template<typename _II, typename _OI>
349 : static _OI
350 0 : __copy_m(_II __first, _II __last, _OI __result)
351 : {
352 : typedef typename iterator_traits<_II>::difference_type _Distance;
353 0 : for(_Distance __n = __last - __first; __n > 0; --__n)
354 : {
355 0 : *__result = std::move(*__first);
356 0 : ++__first;
357 0 : ++__result;
358 : }
359 0 : return __result;
360 : }
361 : };
362 : #endif
363 :
364 : template<bool _IsMove>
365 : struct __copy_move<_IsMove, true, random_access_iterator_tag>
366 : {
367 : template<typename _Tp>
368 : static _Tp*
369 1 : __copy_m(const _Tp* __first, const _Tp* __last, _Tp* __result)
370 : {
371 : #if __cplusplus >= 201103L
372 : // trivial types can have deleted assignment
373 : static_assert( is_copy_assignable<_Tp>::value,
374 : "type is not assignable" );
375 : #endif
376 1 : const ptrdiff_t _Num = __last - __first;
377 1 : if (_Num)
378 0 : __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);
379 1 : return __result + _Num;
380 : }
381 : };
382 :
383 : template<bool _IsMove, typename _II, typename _OI>
384 : inline _OI
385 4 : __copy_move_a(_II __first, _II __last, _OI __result)
386 : {
387 : typedef typename iterator_traits<_II>::value_type _ValueTypeI;
388 : typedef typename iterator_traits<_OI>::value_type _ValueTypeO;
389 : typedef typename iterator_traits<_II>::iterator_category _Category;
390 : const bool __simple = (__is_trivial(_ValueTypeI)
391 : && __is_pointer<_II>::__value
392 : && __is_pointer<_OI>::__value
393 4 : && __are_same<_ValueTypeI, _ValueTypeO>::__value);
394 :
395 : return std::__copy_move<_IsMove, __simple,
396 4 : _Category>::__copy_m(__first, __last, __result);
397 : }
398 :
399 : // Helpers for streambuf iterators (either istream or ostream).
400 : // NB: avoid including <iosfwd>, relatively large.
401 : template<typename _CharT>
402 : struct char_traits;
403 :
404 : template<typename _CharT, typename _Traits>
405 : class istreambuf_iterator;
406 :
407 : template<typename _CharT, typename _Traits>
408 : class ostreambuf_iterator;
409 :
410 : template<bool _IsMove, typename _CharT>
411 : typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
412 : ostreambuf_iterator<_CharT, char_traits<_CharT> > >::__type
413 : __copy_move_a2(_CharT*, _CharT*,
414 : ostreambuf_iterator<_CharT, char_traits<_CharT> >);
415 :
416 : template<bool _IsMove, typename _CharT>
417 : typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
418 : ostreambuf_iterator<_CharT, char_traits<_CharT> > >::__type
419 : __copy_move_a2(const _CharT*, const _CharT*,
420 : ostreambuf_iterator<_CharT, char_traits<_CharT> >);
421 :
422 : template<bool _IsMove, typename _CharT>
423 : typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
424 : _CharT*>::__type
425 : __copy_move_a2(istreambuf_iterator<_CharT, char_traits<_CharT> >,
426 : istreambuf_iterator<_CharT, char_traits<_CharT> >, _CharT*);
427 :
428 : template<bool _IsMove, typename _II, typename _OI>
429 : inline _OI
430 4 : __copy_move_a2(_II __first, _II __last, _OI __result)
431 : {
432 : return _OI(std::__copy_move_a<_IsMove>(std::__niter_base(__first),
433 : std::__niter_base(__last),
434 4 : std::__niter_base(__result)));
435 : }
436 :
437 : /**
438 : * @brief Copies the range [first,last) into result.
439 : * @ingroup mutating_algorithms
440 : * @param __first An input iterator.
441 : * @param __last An input iterator.
442 : * @param __result An output iterator.
443 : * @return result + (first - last)
444 : *
445 : * This inline function will boil down to a call to @c memmove whenever
446 : * possible. Failing that, if random access iterators are passed, then the
447 : * loop count will be known (and therefore a candidate for compiler
448 : * optimizations such as unrolling). Result may not be contained within
449 : * [first,last); the copy_backward function should be used instead.
450 : *
451 : * Note that the end of the output range is permitted to be contained
452 : * within [first,last).
453 : */
454 : template<typename _II, typename _OI>
455 : inline _OI
456 4 : copy(_II __first, _II __last, _OI __result)
457 : {
458 : // concept requirements
459 : __glibcxx_function_requires(_InputIteratorConcept<_II>)
460 : __glibcxx_function_requires(_OutputIteratorConcept<_OI,
461 : typename iterator_traits<_II>::value_type>)
462 : __glibcxx_requires_valid_range(__first, __last);
463 :
464 : return (std::__copy_move_a2<__is_move_iterator<_II>::__value>
465 : (std::__miter_base(__first), std::__miter_base(__last),
466 4 : __result));
467 : }
468 :
469 : #if __cplusplus >= 201103L
470 : /**
471 : * @brief Moves the range [first,last) into result.
472 : * @ingroup mutating_algorithms
473 : * @param __first An input iterator.
474 : * @param __last An input iterator.
475 : * @param __result An output iterator.
476 : * @return result + (first - last)
477 : *
478 : * This inline function will boil down to a call to @c memmove whenever
479 : * possible. Failing that, if random access iterators are passed, then the
480 : * loop count will be known (and therefore a candidate for compiler
481 : * optimizations such as unrolling). Result may not be contained within
482 : * [first,last); the move_backward function should be used instead.
483 : *
484 : * Note that the end of the output range is permitted to be contained
485 : * within [first,last).
486 : */
487 : template<typename _II, typename _OI>
488 : inline _OI
489 0 : move(_II __first, _II __last, _OI __result)
490 : {
491 : // concept requirements
492 : __glibcxx_function_requires(_InputIteratorConcept<_II>)
493 : __glibcxx_function_requires(_OutputIteratorConcept<_OI,
494 : typename iterator_traits<_II>::value_type>)
495 : __glibcxx_requires_valid_range(__first, __last);
496 :
497 : return std::__copy_move_a2<true>(std::__miter_base(__first),
498 0 : std::__miter_base(__last), __result);
499 : }
500 :
501 : #define _GLIBCXX_MOVE3(_Tp, _Up, _Vp) std::move(_Tp, _Up, _Vp)
502 : #else
503 : #define _GLIBCXX_MOVE3(_Tp, _Up, _Vp) std::copy(_Tp, _Up, _Vp)
504 : #endif
505 :
506 : template<bool, bool, typename>
507 : struct __copy_move_backward
508 : {
509 : template<typename _BI1, typename _BI2>
510 : static _BI2
511 : __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
512 : {
513 : while (__first != __last)
514 : *--__result = *--__last;
515 : return __result;
516 : }
517 : };
518 :
519 : #if __cplusplus >= 201103L
520 : template<typename _Category>
521 : struct __copy_move_backward<true, false, _Category>
522 : {
523 : template<typename _BI1, typename _BI2>
524 : static _BI2
525 : __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
526 : {
527 : while (__first != __last)
528 : *--__result = std::move(*--__last);
529 : return __result;
530 : }
531 : };
532 : #endif
533 :
534 : template<>
535 : struct __copy_move_backward<false, false, random_access_iterator_tag>
536 : {
537 : template<typename _BI1, typename _BI2>
538 : static _BI2
539 : __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
540 : {
541 : typename iterator_traits<_BI1>::difference_type __n;
542 : for (__n = __last - __first; __n > 0; --__n)
543 : *--__result = *--__last;
544 : return __result;
545 : }
546 : };
547 :
548 : #if __cplusplus >= 201103L
549 : template<>
550 : struct __copy_move_backward<true, false, random_access_iterator_tag>
551 : {
552 : template<typename _BI1, typename _BI2>
553 : static _BI2
554 0 : __copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
555 : {
556 : typename iterator_traits<_BI1>::difference_type __n;
557 0 : for (__n = __last - __first; __n > 0; --__n)
558 0 : *--__result = std::move(*--__last);
559 0 : return __result;
560 : }
561 : };
562 : #endif
563 :
564 : template<bool _IsMove>
565 : struct __copy_move_backward<_IsMove, true, random_access_iterator_tag>
566 : {
567 : template<typename _Tp>
568 : static _Tp*
569 : __copy_move_b(const _Tp* __first, const _Tp* __last, _Tp* __result)
570 : {
571 : #if __cplusplus >= 201103L
572 : // trivial types can have deleted assignment
573 : static_assert( is_copy_assignable<_Tp>::value,
574 : "type is not assignable" );
575 : #endif
576 : const ptrdiff_t _Num = __last - __first;
577 : if (_Num)
578 : __builtin_memmove(__result - _Num, __first, sizeof(_Tp) * _Num);
579 : return __result - _Num;
580 : }
581 : };
582 :
583 : template<bool _IsMove, typename _BI1, typename _BI2>
584 : inline _BI2
585 0 : __copy_move_backward_a(_BI1 __first, _BI1 __last, _BI2 __result)
586 : {
587 : typedef typename iterator_traits<_BI1>::value_type _ValueType1;
588 : typedef typename iterator_traits<_BI2>::value_type _ValueType2;
589 : typedef typename iterator_traits<_BI1>::iterator_category _Category;
590 : const bool __simple = (__is_trivial(_ValueType1)
591 : && __is_pointer<_BI1>::__value
592 : && __is_pointer<_BI2>::__value
593 0 : && __are_same<_ValueType1, _ValueType2>::__value);
594 :
595 : return std::__copy_move_backward<_IsMove, __simple,
596 : _Category>::__copy_move_b(__first,
597 : __last,
598 0 : __result);
599 : }
600 :
601 : template<bool _IsMove, typename _BI1, typename _BI2>
602 : inline _BI2
603 0 : __copy_move_backward_a2(_BI1 __first, _BI1 __last, _BI2 __result)
604 : {
605 : return _BI2(std::__copy_move_backward_a<_IsMove>
606 : (std::__niter_base(__first), std::__niter_base(__last),
607 0 : std::__niter_base(__result)));
608 : }
609 :
610 : /**
611 : * @brief Copies the range [first,last) into result.
612 : * @ingroup mutating_algorithms
613 : * @param __first A bidirectional iterator.
614 : * @param __last A bidirectional iterator.
615 : * @param __result A bidirectional iterator.
616 : * @return result - (first - last)
617 : *
618 : * The function has the same effect as copy, but starts at the end of the
619 : * range and works its way to the start, returning the start of the result.
620 : * This inline function will boil down to a call to @c memmove whenever
621 : * possible. Failing that, if random access iterators are passed, then the
622 : * loop count will be known (and therefore a candidate for compiler
623 : * optimizations such as unrolling).
624 : *
625 : * Result may not be in the range (first,last]. Use copy instead. Note
626 : * that the start of the output range may overlap [first,last).
627 : */
628 : template<typename _BI1, typename _BI2>
629 : inline _BI2
630 : copy_backward(_BI1 __first, _BI1 __last, _BI2 __result)
631 : {
632 : // concept requirements
633 : __glibcxx_function_requires(_BidirectionalIteratorConcept<_BI1>)
634 : __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
635 : __glibcxx_function_requires(_ConvertibleConcept<
636 : typename iterator_traits<_BI1>::value_type,
637 : typename iterator_traits<_BI2>::value_type>)
638 : __glibcxx_requires_valid_range(__first, __last);
639 :
640 : return (std::__copy_move_backward_a2<__is_move_iterator<_BI1>::__value>
641 : (std::__miter_base(__first), std::__miter_base(__last),
642 : __result));
643 : }
644 :
645 : #if __cplusplus >= 201103L
646 : /**
647 : * @brief Moves the range [first,last) into result.
648 : * @ingroup mutating_algorithms
649 : * @param __first A bidirectional iterator.
650 : * @param __last A bidirectional iterator.
651 : * @param __result A bidirectional iterator.
652 : * @return result - (first - last)
653 : *
654 : * The function has the same effect as move, but starts at the end of the
655 : * range and works its way to the start, returning the start of the result.
656 : * This inline function will boil down to a call to @c memmove whenever
657 : * possible. Failing that, if random access iterators are passed, then the
658 : * loop count will be known (and therefore a candidate for compiler
659 : * optimizations such as unrolling).
660 : *
661 : * Result may not be in the range (first,last]. Use move instead. Note
662 : * that the start of the output range may overlap [first,last).
663 : */
664 : template<typename _BI1, typename _BI2>
665 : inline _BI2
666 0 : move_backward(_BI1 __first, _BI1 __last, _BI2 __result)
667 : {
668 : // concept requirements
669 : __glibcxx_function_requires(_BidirectionalIteratorConcept<_BI1>)
670 : __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
671 : __glibcxx_function_requires(_ConvertibleConcept<
672 : typename iterator_traits<_BI1>::value_type,
673 : typename iterator_traits<_BI2>::value_type>)
674 : __glibcxx_requires_valid_range(__first, __last);
675 :
676 : return std::__copy_move_backward_a2<true>(std::__miter_base(__first),
677 : std::__miter_base(__last),
678 0 : __result);
679 : }
680 :
681 : #define _GLIBCXX_MOVE_BACKWARD3(_Tp, _Up, _Vp) std::move_backward(_Tp, _Up, _Vp)
682 : #else
683 : #define _GLIBCXX_MOVE_BACKWARD3(_Tp, _Up, _Vp) std::copy_backward(_Tp, _Up, _Vp)
684 : #endif
685 :
686 : template<typename _ForwardIterator, typename _Tp>
687 : inline typename
688 : __gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, void>::__type
689 : __fill_a(_ForwardIterator __first, _ForwardIterator __last,
690 : const _Tp& __value)
691 : {
692 : for (; __first != __last; ++__first)
693 : *__first = __value;
694 : }
695 :
696 : template<typename _ForwardIterator, typename _Tp>
697 : inline typename
698 : __gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, void>::__type
699 : __fill_a(_ForwardIterator __first, _ForwardIterator __last,
700 : const _Tp& __value)
701 : {
702 : const _Tp __tmp = __value;
703 : for (; __first != __last; ++__first)
704 : *__first = __tmp;
705 : }
706 :
707 : // Specialization: for char types we can use memset.
708 : template<typename _Tp>
709 : inline typename
710 : __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, void>::__type
711 : __fill_a(_Tp* __first, _Tp* __last, const _Tp& __c)
712 : {
713 : const _Tp __tmp = __c;
714 : __builtin_memset(__first, static_cast<unsigned char>(__tmp),
715 : __last - __first);
716 : }
717 :
718 : /**
719 : * @brief Fills the range [first,last) with copies of value.
720 : * @ingroup mutating_algorithms
721 : * @param __first A forward iterator.
722 : * @param __last A forward iterator.
723 : * @param __value A reference-to-const of arbitrary type.
724 : * @return Nothing.
725 : *
726 : * This function fills a range with copies of the same value. For char
727 : * types filling contiguous areas of memory, this becomes an inline call
728 : * to @c memset or @c wmemset.
729 : */
730 : template<typename _ForwardIterator, typename _Tp>
731 : inline void
732 : fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value)
733 : {
734 : // concept requirements
735 : __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
736 : _ForwardIterator>)
737 : __glibcxx_requires_valid_range(__first, __last);
738 :
739 : std::__fill_a(std::__niter_base(__first), std::__niter_base(__last),
740 : __value);
741 : }
742 :
743 : template<typename _OutputIterator, typename _Size, typename _Tp>
744 : inline typename
745 : __gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, _OutputIterator>::__type
746 : __fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value)
747 : {
748 : for (__decltype(__n + 0) __niter = __n;
749 : __niter > 0; --__niter, ++__first)
750 : *__first = __value;
751 : return __first;
752 : }
753 :
754 : template<typename _OutputIterator, typename _Size, typename _Tp>
755 : inline typename
756 : __gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, _OutputIterator>::__type
757 : __fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value)
758 : {
759 : const _Tp __tmp = __value;
760 : for (__decltype(__n + 0) __niter = __n;
761 : __niter > 0; --__niter, ++__first)
762 : *__first = __tmp;
763 : return __first;
764 : }
765 :
766 : template<typename _Size, typename _Tp>
767 : inline typename
768 : __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, _Tp*>::__type
769 : __fill_n_a(_Tp* __first, _Size __n, const _Tp& __c)
770 : {
771 : std::__fill_a(__first, __first + __n, __c);
772 : return __first + __n;
773 : }
774 :
775 : /**
776 : * @brief Fills the range [first,first+n) with copies of value.
777 : * @ingroup mutating_algorithms
778 : * @param __first An output iterator.
779 : * @param __n The count of copies to perform.
780 : * @param __value A reference-to-const of arbitrary type.
781 : * @return The iterator at first+n.
782 : *
783 : * This function fills a range with copies of the same value. For char
784 : * types filling contiguous areas of memory, this becomes an inline call
785 : * to @c memset or @ wmemset.
786 : *
787 : * _GLIBCXX_RESOLVE_LIB_DEFECTS
788 : * DR 865. More algorithms that throw away information
789 : */
790 : template<typename _OI, typename _Size, typename _Tp>
791 : inline _OI
792 : fill_n(_OI __first, _Size __n, const _Tp& __value)
793 : {
794 : // concept requirements
795 : __glibcxx_function_requires(_OutputIteratorConcept<_OI, _Tp>)
796 :
797 : return _OI(std::__fill_n_a(std::__niter_base(__first), __n, __value));
798 : }
799 :
800 : template<bool _BoolType>
801 : struct __equal
802 : {
803 : template<typename _II1, typename _II2>
804 : static bool
805 : equal(_II1 __first1, _II1 __last1, _II2 __first2)
806 : {
807 : for (; __first1 != __last1; ++__first1, ++__first2)
808 : if (!(*__first1 == *__first2))
809 : return false;
810 : return true;
811 : }
812 : };
813 :
814 : template<>
815 : struct __equal<true>
816 : {
817 : template<typename _Tp>
818 : static bool
819 : equal(const _Tp* __first1, const _Tp* __last1, const _Tp* __first2)
820 : {
821 : return !__builtin_memcmp(__first1, __first2, sizeof(_Tp)
822 : * (__last1 - __first1));
823 : }
824 : };
825 :
826 : template<typename _II1, typename _II2>
827 : inline bool
828 : __equal_aux(_II1 __first1, _II1 __last1, _II2 __first2)
829 : {
830 : typedef typename iterator_traits<_II1>::value_type _ValueType1;
831 : typedef typename iterator_traits<_II2>::value_type _ValueType2;
832 : const bool __simple = ((__is_integer<_ValueType1>::__value
833 : || __is_pointer<_ValueType1>::__value)
834 : && __is_pointer<_II1>::__value
835 : && __is_pointer<_II2>::__value
836 : && __are_same<_ValueType1, _ValueType2>::__value);
837 :
838 : return std::__equal<__simple>::equal(__first1, __last1, __first2);
839 : }
840 :
841 : template<typename, typename>
842 : struct __lc_rai
843 : {
844 : template<typename _II1, typename _II2>
845 : static _II1
846 : __newlast1(_II1, _II1 __last1, _II2, _II2)
847 : { return __last1; }
848 :
849 : template<typename _II>
850 : static bool
851 : __cnd2(_II __first, _II __last)
852 : { return __first != __last; }
853 : };
854 :
855 : template<>
856 : struct __lc_rai<random_access_iterator_tag, random_access_iterator_tag>
857 : {
858 : template<typename _RAI1, typename _RAI2>
859 : static _RAI1
860 : __newlast1(_RAI1 __first1, _RAI1 __last1,
861 : _RAI2 __first2, _RAI2 __last2)
862 : {
863 : const typename iterator_traits<_RAI1>::difference_type
864 : __diff1 = __last1 - __first1;
865 : const typename iterator_traits<_RAI2>::difference_type
866 : __diff2 = __last2 - __first2;
867 : return __diff2 < __diff1 ? __first1 + __diff2 : __last1;
868 : }
869 :
870 : template<typename _RAI>
871 : static bool
872 : __cnd2(_RAI, _RAI)
873 : { return true; }
874 : };
875 :
876 : template<typename _II1, typename _II2, typename _Compare>
877 : bool
878 : __lexicographical_compare_impl(_II1 __first1, _II1 __last1,
879 : _II2 __first2, _II2 __last2,
880 : _Compare __comp)
881 : {
882 : typedef typename iterator_traits<_II1>::iterator_category _Category1;
883 : typedef typename iterator_traits<_II2>::iterator_category _Category2;
884 : typedef std::__lc_rai<_Category1, _Category2> __rai_type;
885 :
886 : __last1 = __rai_type::__newlast1(__first1, __last1, __first2, __last2);
887 : for (; __first1 != __last1 && __rai_type::__cnd2(__first2, __last2);
888 : ++__first1, ++__first2)
889 : {
890 : if (__comp(__first1, __first2))
891 : return true;
892 : if (__comp(__first2, __first1))
893 : return false;
894 : }
895 : return __first1 == __last1 && __first2 != __last2;
896 : }
897 :
898 : template<bool _BoolType>
899 : struct __lexicographical_compare
900 : {
901 : template<typename _II1, typename _II2>
902 : static bool __lc(_II1, _II1, _II2, _II2);
903 : };
904 :
905 : template<bool _BoolType>
906 : template<typename _II1, typename _II2>
907 : bool
908 : __lexicographical_compare<_BoolType>::
909 : __lc(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
910 : {
911 : return std::__lexicographical_compare_impl(__first1, __last1,
912 : __first2, __last2,
913 : __gnu_cxx::__ops::__iter_less_iter());
914 : }
915 :
916 : template<>
917 : struct __lexicographical_compare<true>
918 : {
919 : template<typename _Tp, typename _Up>
920 : static bool
921 : __lc(const _Tp* __first1, const _Tp* __last1,
922 : const _Up* __first2, const _Up* __last2)
923 : {
924 : const size_t __len1 = __last1 - __first1;
925 : const size_t __len2 = __last2 - __first2;
926 : const int __result = __builtin_memcmp(__first1, __first2,
927 : std::min(__len1, __len2));
928 : return __result != 0 ? __result < 0 : __len1 < __len2;
929 : }
930 : };
931 :
932 : template<typename _II1, typename _II2>
933 : inline bool
934 : __lexicographical_compare_aux(_II1 __first1, _II1 __last1,
935 : _II2 __first2, _II2 __last2)
936 : {
937 : typedef typename iterator_traits<_II1>::value_type _ValueType1;
938 : typedef typename iterator_traits<_II2>::value_type _ValueType2;
939 : const bool __simple =
940 : (__is_byte<_ValueType1>::__value && __is_byte<_ValueType2>::__value
941 : && !__gnu_cxx::__numeric_traits<_ValueType1>::__is_signed
942 : && !__gnu_cxx::__numeric_traits<_ValueType2>::__is_signed
943 : && __is_pointer<_II1>::__value
944 : && __is_pointer<_II2>::__value);
945 :
946 : return std::__lexicographical_compare<__simple>::__lc(__first1, __last1,
947 : __first2, __last2);
948 : }
949 :
950 : template<typename _ForwardIterator, typename _Tp, typename _Compare>
951 : _ForwardIterator
952 : __lower_bound(_ForwardIterator __first, _ForwardIterator __last,
953 : const _Tp& __val, _Compare __comp)
954 : {
955 : typedef typename iterator_traits<_ForwardIterator>::difference_type
956 : _DistanceType;
957 :
958 : _DistanceType __len = std::distance(__first, __last);
959 :
960 : while (__len > 0)
961 : {
962 : _DistanceType __half = __len >> 1;
963 : _ForwardIterator __middle = __first;
964 : std::advance(__middle, __half);
965 : if (__comp(__middle, __val))
966 : {
967 : __first = __middle;
968 : ++__first;
969 : __len = __len - __half - 1;
970 : }
971 : else
972 : __len = __half;
973 : }
974 : return __first;
975 : }
976 :
977 : /**
978 : * @brief Finds the first position in which @a val could be inserted
979 : * without changing the ordering.
980 : * @param __first An iterator.
981 : * @param __last Another iterator.
982 : * @param __val The search term.
983 : * @return An iterator pointing to the first element <em>not less
984 : * than</em> @a val, or end() if every element is less than
985 : * @a val.
986 : * @ingroup binary_search_algorithms
987 : */
988 : template<typename _ForwardIterator, typename _Tp>
989 : inline _ForwardIterator
990 : lower_bound(_ForwardIterator __first, _ForwardIterator __last,
991 : const _Tp& __val)
992 : {
993 : // concept requirements
994 : __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
995 : __glibcxx_function_requires(_LessThanOpConcept<
996 : typename iterator_traits<_ForwardIterator>::value_type, _Tp>)
997 : __glibcxx_requires_partitioned_lower(__first, __last, __val);
998 :
999 : return std::__lower_bound(__first, __last, __val,
1000 : __gnu_cxx::__ops::__iter_less_val());
1001 : }
1002 :
1003 : /// This is a helper function for the sort routines and for random.tcc.
1004 : // Precondition: __n > 0.
1005 : inline _GLIBCXX_CONSTEXPR int
1006 : __lg(int __n)
1007 : { return sizeof(int) * __CHAR_BIT__ - 1 - __builtin_clz(__n); }
1008 :
1009 : inline _GLIBCXX_CONSTEXPR unsigned
1010 : __lg(unsigned __n)
1011 : { return sizeof(int) * __CHAR_BIT__ - 1 - __builtin_clz(__n); }
1012 :
1013 : inline _GLIBCXX_CONSTEXPR long
1014 0 : __lg(long __n)
1015 0 : { return sizeof(long) * __CHAR_BIT__ - 1 - __builtin_clzl(__n); }
1016 :
1017 : inline _GLIBCXX_CONSTEXPR unsigned long
1018 : __lg(unsigned long __n)
1019 : { return sizeof(long) * __CHAR_BIT__ - 1 - __builtin_clzl(__n); }
1020 :
1021 : inline _GLIBCXX_CONSTEXPR long long
1022 : __lg(long long __n)
1023 : { return sizeof(long long) * __CHAR_BIT__ - 1 - __builtin_clzll(__n); }
1024 :
1025 : inline _GLIBCXX_CONSTEXPR unsigned long long
1026 : __lg(unsigned long long __n)
1027 : { return sizeof(long long) * __CHAR_BIT__ - 1 - __builtin_clzll(__n); }
1028 :
1029 : _GLIBCXX_END_NAMESPACE_VERSION
1030 :
1031 : _GLIBCXX_BEGIN_NAMESPACE_ALGO
1032 :
1033 : /**
1034 : * @brief Tests a range for element-wise equality.
1035 : * @ingroup non_mutating_algorithms
1036 : * @param __first1 An input iterator.
1037 : * @param __last1 An input iterator.
1038 : * @param __first2 An input iterator.
1039 : * @return A boolean true or false.
1040 : *
1041 : * This compares the elements of two ranges using @c == and returns true or
1042 : * false depending on whether all of the corresponding elements of the
1043 : * ranges are equal.
1044 : */
1045 : template<typename _II1, typename _II2>
1046 : inline bool
1047 : equal(_II1 __first1, _II1 __last1, _II2 __first2)
1048 : {
1049 : // concept requirements
1050 : __glibcxx_function_requires(_InputIteratorConcept<_II1>)
1051 : __glibcxx_function_requires(_InputIteratorConcept<_II2>)
1052 : __glibcxx_function_requires(_EqualOpConcept<
1053 : typename iterator_traits<_II1>::value_type,
1054 : typename iterator_traits<_II2>::value_type>)
1055 : __glibcxx_requires_valid_range(__first1, __last1);
1056 :
1057 : return std::__equal_aux(std::__niter_base(__first1),
1058 : std::__niter_base(__last1),
1059 : std::__niter_base(__first2));
1060 : }
1061 :
1062 : /**
1063 : * @brief Tests a range for element-wise equality.
1064 : * @ingroup non_mutating_algorithms
1065 : * @param __first1 An input iterator.
1066 : * @param __last1 An input iterator.
1067 : * @param __first2 An input iterator.
1068 : * @param __binary_pred A binary predicate @link functors
1069 : * functor@endlink.
1070 : * @return A boolean true or false.
1071 : *
1072 : * This compares the elements of two ranges using the binary_pred
1073 : * parameter, and returns true or
1074 : * false depending on whether all of the corresponding elements of the
1075 : * ranges are equal.
1076 : */
1077 : template<typename _IIter1, typename _IIter2, typename _BinaryPredicate>
1078 : inline bool
1079 : equal(_IIter1 __first1, _IIter1 __last1,
1080 : _IIter2 __first2, _BinaryPredicate __binary_pred)
1081 : {
1082 : // concept requirements
1083 : __glibcxx_function_requires(_InputIteratorConcept<_IIter1>)
1084 : __glibcxx_function_requires(_InputIteratorConcept<_IIter2>)
1085 : __glibcxx_requires_valid_range(__first1, __last1);
1086 :
1087 : for (; __first1 != __last1; ++__first1, ++__first2)
1088 : if (!bool(__binary_pred(*__first1, *__first2)))
1089 : return false;
1090 : return true;
1091 : }
1092 :
1093 : #if __cplusplus > 201103L
1094 :
1095 : #define __cpp_lib_robust_nonmodifying_seq_ops 201304
1096 :
1097 : /**
1098 : * @brief Tests a range for element-wise equality.
1099 : * @ingroup non_mutating_algorithms
1100 : * @param __first1 An input iterator.
1101 : * @param __last1 An input iterator.
1102 : * @param __first2 An input iterator.
1103 : * @param __last2 An input iterator.
1104 : * @return A boolean true or false.
1105 : *
1106 : * This compares the elements of two ranges using @c == and returns true or
1107 : * false depending on whether all of the corresponding elements of the
1108 : * ranges are equal.
1109 : */
1110 : template<typename _II1, typename _II2>
1111 : inline bool
1112 : equal(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
1113 : {
1114 : // concept requirements
1115 : __glibcxx_function_requires(_InputIteratorConcept<_II1>)
1116 : __glibcxx_function_requires(_InputIteratorConcept<_II2>)
1117 : __glibcxx_function_requires(_EqualOpConcept<
1118 : typename iterator_traits<_II1>::value_type,
1119 : typename iterator_traits<_II2>::value_type>)
1120 : __glibcxx_requires_valid_range(__first1, __last1);
1121 : __glibcxx_requires_valid_range(__first2, __last2);
1122 :
1123 : using _RATag = random_access_iterator_tag;
1124 : using _Cat1 = typename iterator_traits<_II1>::iterator_category;
1125 : using _Cat2 = typename iterator_traits<_II2>::iterator_category;
1126 : using _RAIters = __and_<is_same<_Cat1, _RATag>, is_same<_Cat2, _RATag>>;
1127 : if (_RAIters())
1128 : {
1129 : auto __d1 = std::distance(__first1, __last1);
1130 : auto __d2 = std::distance(__first2, __last2);
1131 : if (__d1 != __d2)
1132 : return false;
1133 : return _GLIBCXX_STD_A::equal(__first1, __last1, __first2);
1134 : }
1135 :
1136 : for (; __first1 != __last1 && __first2 != __last2; ++__first1, ++__first2)
1137 : if (!(*__first1 == *__first2))
1138 : return false;
1139 : return __first1 == __last1 && __first2 == __last2;
1140 : }
1141 :
1142 : /**
1143 : * @brief Tests a range for element-wise equality.
1144 : * @ingroup non_mutating_algorithms
1145 : * @param __first1 An input iterator.
1146 : * @param __last1 An input iterator.
1147 : * @param __first2 An input iterator.
1148 : * @param __last2 An input iterator.
1149 : * @param __binary_pred A binary predicate @link functors
1150 : * functor@endlink.
1151 : * @return A boolean true or false.
1152 : *
1153 : * This compares the elements of two ranges using the binary_pred
1154 : * parameter, and returns true or
1155 : * false depending on whether all of the corresponding elements of the
1156 : * ranges are equal.
1157 : */
1158 : template<typename _IIter1, typename _IIter2, typename _BinaryPredicate>
1159 : inline bool
1160 : equal(_IIter1 __first1, _IIter1 __last1,
1161 : _IIter2 __first2, _IIter2 __last2, _BinaryPredicate __binary_pred)
1162 : {
1163 : // concept requirements
1164 : __glibcxx_function_requires(_InputIteratorConcept<_IIter1>)
1165 : __glibcxx_function_requires(_InputIteratorConcept<_IIter2>)
1166 : __glibcxx_requires_valid_range(__first1, __last1);
1167 : __glibcxx_requires_valid_range(__first2, __last2);
1168 :
1169 : using _RATag = random_access_iterator_tag;
1170 : using _Cat1 = typename iterator_traits<_IIter1>::iterator_category;
1171 : using _Cat2 = typename iterator_traits<_IIter2>::iterator_category;
1172 : using _RAIters = __and_<is_same<_Cat1, _RATag>, is_same<_Cat2, _RATag>>;
1173 : if (_RAIters())
1174 : {
1175 : auto __d1 = std::distance(__first1, __last1);
1176 : auto __d2 = std::distance(__first2, __last2);
1177 : if (__d1 != __d2)
1178 : return false;
1179 : return _GLIBCXX_STD_A::equal(__first1, __last1, __first2,
1180 : __binary_pred);
1181 : }
1182 :
1183 : for (; __first1 != __last1 && __first2 != __last2; ++__first1, ++__first2)
1184 : if (!bool(__binary_pred(*__first1, *__first2)))
1185 : return false;
1186 : return __first1 == __last1 && __first2 == __last2;
1187 : }
1188 : #endif
1189 :
1190 : /**
1191 : * @brief Performs @b dictionary comparison on ranges.
1192 : * @ingroup sorting_algorithms
1193 : * @param __first1 An input iterator.
1194 : * @param __last1 An input iterator.
1195 : * @param __first2 An input iterator.
1196 : * @param __last2 An input iterator.
1197 : * @return A boolean true or false.
1198 : *
1199 : * <em>Returns true if the sequence of elements defined by the range
1200 : * [first1,last1) is lexicographically less than the sequence of elements
1201 : * defined by the range [first2,last2). Returns false otherwise.</em>
1202 : * (Quoted from [25.3.8]/1.) If the iterators are all character pointers,
1203 : * then this is an inline call to @c memcmp.
1204 : */
1205 : template<typename _II1, typename _II2>
1206 : inline bool
1207 : lexicographical_compare(_II1 __first1, _II1 __last1,
1208 : _II2 __first2, _II2 __last2)
1209 : {
1210 : #ifdef _GLIBCXX_CONCEPT_CHECKS
1211 : // concept requirements
1212 : typedef typename iterator_traits<_II1>::value_type _ValueType1;
1213 : typedef typename iterator_traits<_II2>::value_type _ValueType2;
1214 : #endif
1215 : __glibcxx_function_requires(_InputIteratorConcept<_II1>)
1216 : __glibcxx_function_requires(_InputIteratorConcept<_II2>)
1217 : __glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
1218 : __glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
1219 : __glibcxx_requires_valid_range(__first1, __last1);
1220 : __glibcxx_requires_valid_range(__first2, __last2);
1221 :
1222 : return std::__lexicographical_compare_aux(std::__niter_base(__first1),
1223 : std::__niter_base(__last1),
1224 : std::__niter_base(__first2),
1225 : std::__niter_base(__last2));
1226 : }
1227 :
1228 : /**
1229 : * @brief Performs @b dictionary comparison on ranges.
1230 : * @ingroup sorting_algorithms
1231 : * @param __first1 An input iterator.
1232 : * @param __last1 An input iterator.
1233 : * @param __first2 An input iterator.
1234 : * @param __last2 An input iterator.
1235 : * @param __comp A @link comparison_functors comparison functor@endlink.
1236 : * @return A boolean true or false.
1237 : *
1238 : * The same as the four-parameter @c lexicographical_compare, but uses the
1239 : * comp parameter instead of @c <.
1240 : */
1241 : template<typename _II1, typename _II2, typename _Compare>
1242 : inline bool
1243 : lexicographical_compare(_II1 __first1, _II1 __last1,
1244 : _II2 __first2, _II2 __last2, _Compare __comp)
1245 : {
1246 : // concept requirements
1247 : __glibcxx_function_requires(_InputIteratorConcept<_II1>)
1248 : __glibcxx_function_requires(_InputIteratorConcept<_II2>)
1249 : __glibcxx_requires_valid_range(__first1, __last1);
1250 : __glibcxx_requires_valid_range(__first2, __last2);
1251 :
1252 : return std::__lexicographical_compare_impl
1253 : (__first1, __last1, __first2, __last2,
1254 : __gnu_cxx::__ops::__iter_comp_iter(__comp));
1255 : }
1256 :
1257 : template<typename _InputIterator1, typename _InputIterator2,
1258 : typename _BinaryPredicate>
1259 : pair<_InputIterator1, _InputIterator2>
1260 : __mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
1261 : _InputIterator2 __first2, _BinaryPredicate __binary_pred)
1262 : {
1263 : while (__first1 != __last1 && __binary_pred(__first1, __first2))
1264 : {
1265 : ++__first1;
1266 : ++__first2;
1267 : }
1268 : return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
1269 : }
1270 :
1271 : /**
1272 : * @brief Finds the places in ranges which don't match.
1273 : * @ingroup non_mutating_algorithms
1274 : * @param __first1 An input iterator.
1275 : * @param __last1 An input iterator.
1276 : * @param __first2 An input iterator.
1277 : * @return A pair of iterators pointing to the first mismatch.
1278 : *
1279 : * This compares the elements of two ranges using @c == and returns a pair
1280 : * of iterators. The first iterator points into the first range, the
1281 : * second iterator points into the second range, and the elements pointed
1282 : * to by the iterators are not equal.
1283 : */
1284 : template<typename _InputIterator1, typename _InputIterator2>
1285 : inline pair<_InputIterator1, _InputIterator2>
1286 : mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
1287 : _InputIterator2 __first2)
1288 : {
1289 : // concept requirements
1290 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
1291 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
1292 : __glibcxx_function_requires(_EqualOpConcept<
1293 : typename iterator_traits<_InputIterator1>::value_type,
1294 : typename iterator_traits<_InputIterator2>::value_type>)
1295 : __glibcxx_requires_valid_range(__first1, __last1);
1296 :
1297 : return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2,
1298 : __gnu_cxx::__ops::__iter_equal_to_iter());
1299 : }
1300 :
1301 : /**
1302 : * @brief Finds the places in ranges which don't match.
1303 : * @ingroup non_mutating_algorithms
1304 : * @param __first1 An input iterator.
1305 : * @param __last1 An input iterator.
1306 : * @param __first2 An input iterator.
1307 : * @param __binary_pred A binary predicate @link functors
1308 : * functor@endlink.
1309 : * @return A pair of iterators pointing to the first mismatch.
1310 : *
1311 : * This compares the elements of two ranges using the binary_pred
1312 : * parameter, and returns a pair
1313 : * of iterators. The first iterator points into the first range, the
1314 : * second iterator points into the second range, and the elements pointed
1315 : * to by the iterators are not equal.
1316 : */
1317 : template<typename _InputIterator1, typename _InputIterator2,
1318 : typename _BinaryPredicate>
1319 : inline pair<_InputIterator1, _InputIterator2>
1320 : mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
1321 : _InputIterator2 __first2, _BinaryPredicate __binary_pred)
1322 : {
1323 : // concept requirements
1324 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
1325 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
1326 : __glibcxx_requires_valid_range(__first1, __last1);
1327 :
1328 : return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2,
1329 : __gnu_cxx::__ops::__iter_comp_iter(__binary_pred));
1330 : }
1331 :
1332 : #if __cplusplus > 201103L
1333 :
1334 : template<typename _InputIterator1, typename _InputIterator2,
1335 : typename _BinaryPredicate>
1336 : pair<_InputIterator1, _InputIterator2>
1337 : __mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
1338 : _InputIterator2 __first2, _InputIterator2 __last2,
1339 : _BinaryPredicate __binary_pred)
1340 : {
1341 : while (__first1 != __last1 && __first2 != __last2
1342 : && __binary_pred(__first1, __first2))
1343 : {
1344 : ++__first1;
1345 : ++__first2;
1346 : }
1347 : return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
1348 : }
1349 :
1350 : /**
1351 : * @brief Finds the places in ranges which don't match.
1352 : * @ingroup non_mutating_algorithms
1353 : * @param __first1 An input iterator.
1354 : * @param __last1 An input iterator.
1355 : * @param __first2 An input iterator.
1356 : * @param __last2 An input iterator.
1357 : * @return A pair of iterators pointing to the first mismatch.
1358 : *
1359 : * This compares the elements of two ranges using @c == and returns a pair
1360 : * of iterators. The first iterator points into the first range, the
1361 : * second iterator points into the second range, and the elements pointed
1362 : * to by the iterators are not equal.
1363 : */
1364 : template<typename _InputIterator1, typename _InputIterator2>
1365 : inline pair<_InputIterator1, _InputIterator2>
1366 : mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
1367 : _InputIterator2 __first2, _InputIterator2 __last2)
1368 : {
1369 : // concept requirements
1370 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
1371 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
1372 : __glibcxx_function_requires(_EqualOpConcept<
1373 : typename iterator_traits<_InputIterator1>::value_type,
1374 : typename iterator_traits<_InputIterator2>::value_type>)
1375 : __glibcxx_requires_valid_range(__first1, __last1);
1376 : __glibcxx_requires_valid_range(__first2, __last2);
1377 :
1378 : return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2, __last2,
1379 : __gnu_cxx::__ops::__iter_equal_to_iter());
1380 : }
1381 :
1382 : /**
1383 : * @brief Finds the places in ranges which don't match.
1384 : * @ingroup non_mutating_algorithms
1385 : * @param __first1 An input iterator.
1386 : * @param __last1 An input iterator.
1387 : * @param __first2 An input iterator.
1388 : * @param __last2 An input iterator.
1389 : * @param __binary_pred A binary predicate @link functors
1390 : * functor@endlink.
1391 : * @return A pair of iterators pointing to the first mismatch.
1392 : *
1393 : * This compares the elements of two ranges using the binary_pred
1394 : * parameter, and returns a pair
1395 : * of iterators. The first iterator points into the first range, the
1396 : * second iterator points into the second range, and the elements pointed
1397 : * to by the iterators are not equal.
1398 : */
1399 : template<typename _InputIterator1, typename _InputIterator2,
1400 : typename _BinaryPredicate>
1401 : inline pair<_InputIterator1, _InputIterator2>
1402 : mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
1403 : _InputIterator2 __first2, _InputIterator2 __last2,
1404 : _BinaryPredicate __binary_pred)
1405 : {
1406 : // concept requirements
1407 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
1408 : __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
1409 : __glibcxx_requires_valid_range(__first1, __last1);
1410 : __glibcxx_requires_valid_range(__first2, __last2);
1411 :
1412 : return _GLIBCXX_STD_A::__mismatch(__first1, __last1, __first2, __last2,
1413 : __gnu_cxx::__ops::__iter_comp_iter(__binary_pred));
1414 : }
1415 : #endif
1416 :
1417 : _GLIBCXX_END_NAMESPACE_ALGO
1418 : } // namespace std
1419 :
1420 : // NB: This file is included within many other C++ includes, as a way
1421 : // of getting the base algorithms. So, make sure that parallel bits
1422 : // come in too if requested.
1423 : #ifdef _GLIBCXX_PARALLEL
1424 : # include <parallel/algobase.h>
1425 : #endif
1426 :
1427 : #endif
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