Line data Source code
1 : // Set implementation -*- 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) 1996,1997
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_set.h
52 : * This is an internal header file, included by other library headers.
53 : * Do not attempt to use it directly. @headername{set}
54 : */
55 :
56 : #ifndef _STL_SET_H
57 : #define _STL_SET_H 1
58 :
59 : #include <bits/concept_check.h>
60 : #if __cplusplus >= 201103L
61 : #include <initializer_list>
62 : #endif
63 :
64 : namespace std _GLIBCXX_VISIBILITY(default)
65 : {
66 : _GLIBCXX_BEGIN_NAMESPACE_VERSION
67 : _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
68 :
69 : template<typename _Key, typename _Compare, typename _Alloc>
70 : class multiset;
71 :
72 : /**
73 : * @brief A standard container made up of unique keys, which can be
74 : * retrieved in logarithmic time.
75 : *
76 : * @ingroup associative_containers
77 : *
78 : * @tparam _Key Type of key objects.
79 : * @tparam _Compare Comparison function object type, defaults to less<_Key>.
80 : * @tparam _Alloc Allocator type, defaults to allocator<_Key>.
81 : *
82 : * Meets the requirements of a <a href="tables.html#65">container</a>, a
83 : * <a href="tables.html#66">reversible container</a>, and an
84 : * <a href="tables.html#69">associative container</a> (using unique keys).
85 : *
86 : * Sets support bidirectional iterators.
87 : *
88 : * The private tree data is declared exactly the same way for set and
89 : * multiset; the distinction is made entirely in how the tree functions are
90 : * called (*_unique versus *_equal, same as the standard).
91 : */
92 : template<typename _Key, typename _Compare = std::less<_Key>,
93 : typename _Alloc = std::allocator<_Key> >
94 : class set
95 : {
96 : #ifdef _GLIBCXX_CONCEPT_CHECKS
97 : // concept requirements
98 : typedef typename _Alloc::value_type _Alloc_value_type;
99 : # if __cplusplus < 201103L
100 : __glibcxx_class_requires(_Key, _SGIAssignableConcept)
101 : # endif
102 : __glibcxx_class_requires4(_Compare, bool, _Key, _Key,
103 : _BinaryFunctionConcept)
104 : __glibcxx_class_requires2(_Key, _Alloc_value_type, _SameTypeConcept)
105 : #endif
106 :
107 : #if __cplusplus >= 201103L
108 : static_assert(is_same<typename remove_cv<_Key>::type, _Key>::value,
109 : "std::set must have a non-const, non-volatile value_type");
110 : # ifdef __STRICT_ANSI__
111 : static_assert(is_same<typename _Alloc::value_type, _Key>::value,
112 : "std::set must have the same value_type as its allocator");
113 : # endif
114 : #endif
115 :
116 : public:
117 : // typedefs:
118 : //@{
119 : /// Public typedefs.
120 : typedef _Key key_type;
121 : typedef _Key value_type;
122 : typedef _Compare key_compare;
123 : typedef _Compare value_compare;
124 : typedef _Alloc allocator_type;
125 : //@}
126 :
127 : private:
128 : typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
129 : rebind<_Key>::other _Key_alloc_type;
130 :
131 : typedef _Rb_tree<key_type, value_type, _Identity<value_type>,
132 : key_compare, _Key_alloc_type> _Rep_type;
133 : _Rep_type _M_t; // Red-black tree representing set.
134 :
135 : typedef __gnu_cxx::__alloc_traits<_Key_alloc_type> _Alloc_traits;
136 :
137 : public:
138 : //@{
139 : /// Iterator-related typedefs.
140 : typedef typename _Alloc_traits::pointer pointer;
141 : typedef typename _Alloc_traits::const_pointer const_pointer;
142 : typedef typename _Alloc_traits::reference reference;
143 : typedef typename _Alloc_traits::const_reference const_reference;
144 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
145 : // DR 103. set::iterator is required to be modifiable,
146 : // but this allows modification of keys.
147 : typedef typename _Rep_type::const_iterator iterator;
148 : typedef typename _Rep_type::const_iterator const_iterator;
149 : typedef typename _Rep_type::const_reverse_iterator reverse_iterator;
150 : typedef typename _Rep_type::const_reverse_iterator const_reverse_iterator;
151 : typedef typename _Rep_type::size_type size_type;
152 : typedef typename _Rep_type::difference_type difference_type;
153 : //@}
154 :
155 : #if __cplusplus > 201402L
156 : using node_type = typename _Rep_type::node_type;
157 : using insert_return_type = typename _Rep_type::insert_return_type;
158 : #endif
159 :
160 : // allocation/deallocation
161 : /**
162 : * @brief Default constructor creates no elements.
163 : */
164 : #if __cplusplus < 201103L
165 : set() : _M_t() { }
166 : #else
167 1597 : set() = default;
168 : #endif
169 :
170 : /**
171 : * @brief Creates a %set with no elements.
172 : * @param __comp Comparator to use.
173 : * @param __a An allocator object.
174 : */
175 : explicit
176 : set(const _Compare& __comp,
177 : const allocator_type& __a = allocator_type())
178 : : _M_t(__comp, _Key_alloc_type(__a)) { }
179 :
180 : /**
181 : * @brief Builds a %set from a range.
182 : * @param __first An input iterator.
183 : * @param __last An input iterator.
184 : *
185 : * Create a %set consisting of copies of the elements from
186 : * [__first,__last). This is linear in N if the range is
187 : * already sorted, and NlogN otherwise (where N is
188 : * distance(__first,__last)).
189 : */
190 : template<typename _InputIterator>
191 : set(_InputIterator __first, _InputIterator __last)
192 : : _M_t()
193 : { _M_t._M_insert_unique(__first, __last); }
194 :
195 : /**
196 : * @brief Builds a %set from a range.
197 : * @param __first An input iterator.
198 : * @param __last An input iterator.
199 : * @param __comp A comparison functor.
200 : * @param __a An allocator object.
201 : *
202 : * Create a %set consisting of copies of the elements from
203 : * [__first,__last). This is linear in N if the range is
204 : * already sorted, and NlogN otherwise (where N is
205 : * distance(__first,__last)).
206 : */
207 : template<typename _InputIterator>
208 : set(_InputIterator __first, _InputIterator __last,
209 : const _Compare& __comp,
210 : const allocator_type& __a = allocator_type())
211 : : _M_t(__comp, _Key_alloc_type(__a))
212 : { _M_t._M_insert_unique(__first, __last); }
213 :
214 : /**
215 : * @brief %Set copy constructor.
216 : *
217 : * Whether the allocator is copied depends on the allocator traits.
218 : */
219 : #if __cplusplus < 201103L
220 : set(const set& __x)
221 : : _M_t(__x._M_t) { }
222 : #else
223 : set(const set&) = default;
224 :
225 : /**
226 : * @brief %Set move constructor
227 : *
228 : * The newly-created %set contains the exact contents of the moved
229 : * instance. The moved instance is a valid, but unspecified, %set.
230 : */
231 : set(set&&) = default;
232 :
233 : /**
234 : * @brief Builds a %set from an initializer_list.
235 : * @param __l An initializer_list.
236 : * @param __comp A comparison functor.
237 : * @param __a An allocator object.
238 : *
239 : * Create a %set consisting of copies of the elements in the list.
240 : * This is linear in N if the list is already sorted, and NlogN
241 : * otherwise (where N is @a __l.size()).
242 : */
243 : set(initializer_list<value_type> __l,
244 : const _Compare& __comp = _Compare(),
245 : const allocator_type& __a = allocator_type())
246 : : _M_t(__comp, _Key_alloc_type(__a))
247 : { _M_t._M_insert_unique(__l.begin(), __l.end()); }
248 :
249 : /// Allocator-extended default constructor.
250 : explicit
251 : set(const allocator_type& __a)
252 : : _M_t(_Compare(), _Key_alloc_type(__a)) { }
253 :
254 : /// Allocator-extended copy constructor.
255 : set(const set& __x, const allocator_type& __a)
256 : : _M_t(__x._M_t, _Key_alloc_type(__a)) { }
257 :
258 : /// Allocator-extended move constructor.
259 : set(set&& __x, const allocator_type& __a)
260 : noexcept(is_nothrow_copy_constructible<_Compare>::value
261 : && _Alloc_traits::_S_always_equal())
262 : : _M_t(std::move(__x._M_t), _Key_alloc_type(__a)) { }
263 :
264 : /// Allocator-extended initialier-list constructor.
265 : set(initializer_list<value_type> __l, const allocator_type& __a)
266 : : _M_t(_Compare(), _Key_alloc_type(__a))
267 : { _M_t._M_insert_unique(__l.begin(), __l.end()); }
268 :
269 : /// Allocator-extended range constructor.
270 : template<typename _InputIterator>
271 : set(_InputIterator __first, _InputIterator __last,
272 : const allocator_type& __a)
273 : : _M_t(_Compare(), _Key_alloc_type(__a))
274 : { _M_t._M_insert_unique(__first, __last); }
275 :
276 : /**
277 : * The dtor only erases the elements, and note that if the elements
278 : * themselves are pointers, the pointed-to memory is not touched in any
279 : * way. Managing the pointer is the user's responsibility.
280 : */
281 1597 : ~set() = default;
282 : #endif
283 :
284 : /**
285 : * @brief %Set assignment operator.
286 : *
287 : * Whether the allocator is copied depends on the allocator traits.
288 : */
289 : #if __cplusplus < 201103L
290 : set&
291 : operator=(const set& __x)
292 : {
293 : _M_t = __x._M_t;
294 : return *this;
295 : }
296 : #else
297 : set&
298 : operator=(const set&) = default;
299 :
300 : /// Move assignment operator.
301 : set&
302 : operator=(set&&) = default;
303 :
304 : /**
305 : * @brief %Set list assignment operator.
306 : * @param __l An initializer_list.
307 : *
308 : * This function fills a %set with copies of the elements in the
309 : * initializer list @a __l.
310 : *
311 : * Note that the assignment completely changes the %set and
312 : * that the resulting %set's size is the same as the number
313 : * of elements assigned.
314 : */
315 : set&
316 : operator=(initializer_list<value_type> __l)
317 : {
318 : _M_t._M_assign_unique(__l.begin(), __l.end());
319 : return *this;
320 : }
321 : #endif
322 :
323 : // accessors:
324 :
325 : /// Returns the comparison object with which the %set was constructed.
326 : key_compare
327 : key_comp() const
328 : { return _M_t.key_comp(); }
329 : /// Returns the comparison object with which the %set was constructed.
330 : value_compare
331 : value_comp() const
332 : { return _M_t.key_comp(); }
333 : /// Returns the allocator object with which the %set was constructed.
334 : allocator_type
335 : get_allocator() const _GLIBCXX_NOEXCEPT
336 : { return allocator_type(_M_t.get_allocator()); }
337 :
338 : /**
339 : * Returns a read-only (constant) iterator that points to the first
340 : * element in the %set. Iteration is done in ascending order according
341 : * to the keys.
342 : */
343 : iterator
344 : begin() const _GLIBCXX_NOEXCEPT
345 : { return _M_t.begin(); }
346 :
347 : /**
348 : * Returns a read-only (constant) iterator that points one past the last
349 : * element in the %set. Iteration is done in ascending order according
350 : * to the keys.
351 : */
352 : iterator
353 2709 : end() const _GLIBCXX_NOEXCEPT
354 2709 : { return _M_t.end(); }
355 :
356 : /**
357 : * Returns a read-only (constant) iterator that points to the last
358 : * element in the %set. Iteration is done in descending order according
359 : * to the keys.
360 : */
361 : reverse_iterator
362 : rbegin() const _GLIBCXX_NOEXCEPT
363 : { return _M_t.rbegin(); }
364 :
365 : /**
366 : * Returns a read-only (constant) reverse iterator that points to the
367 : * last pair in the %set. Iteration is done in descending order
368 : * according to the keys.
369 : */
370 : reverse_iterator
371 : rend() const _GLIBCXX_NOEXCEPT
372 : { return _M_t.rend(); }
373 :
374 : #if __cplusplus >= 201103L
375 : /**
376 : * Returns a read-only (constant) iterator that points to the first
377 : * element in the %set. Iteration is done in ascending order according
378 : * to the keys.
379 : */
380 : iterator
381 : cbegin() const noexcept
382 : { return _M_t.begin(); }
383 :
384 : /**
385 : * Returns a read-only (constant) iterator that points one past the last
386 : * element in the %set. Iteration is done in ascending order according
387 : * to the keys.
388 : */
389 : iterator
390 : cend() const noexcept
391 : { return _M_t.end(); }
392 :
393 : /**
394 : * Returns a read-only (constant) iterator that points to the last
395 : * element in the %set. Iteration is done in descending order according
396 : * to the keys.
397 : */
398 : reverse_iterator
399 : crbegin() const noexcept
400 : { return _M_t.rbegin(); }
401 :
402 : /**
403 : * Returns a read-only (constant) reverse iterator that points to the
404 : * last pair in the %set. Iteration is done in descending order
405 : * according to the keys.
406 : */
407 : reverse_iterator
408 : crend() const noexcept
409 : { return _M_t.rend(); }
410 : #endif
411 :
412 : /// Returns true if the %set is empty.
413 : bool
414 : empty() const _GLIBCXX_NOEXCEPT
415 : { return _M_t.empty(); }
416 :
417 : /// Returns the size of the %set.
418 : size_type
419 : size() const _GLIBCXX_NOEXCEPT
420 : { return _M_t.size(); }
421 :
422 : /// Returns the maximum size of the %set.
423 : size_type
424 : max_size() const _GLIBCXX_NOEXCEPT
425 : { return _M_t.max_size(); }
426 :
427 : /**
428 : * @brief Swaps data with another %set.
429 : * @param __x A %set of the same element and allocator types.
430 : *
431 : * This exchanges the elements between two sets in constant
432 : * time. (It is only swapping a pointer, an integer, and an
433 : * instance of the @c Compare type (which itself is often
434 : * stateless and empty), so it should be quite fast.) Note
435 : * that the global std::swap() function is specialized such
436 : * that std::swap(s1,s2) will feed to this function.
437 : *
438 : * Whether the allocators are swapped depends on the allocator traits.
439 : */
440 : void
441 : swap(set& __x)
442 : _GLIBCXX_NOEXCEPT_IF(__is_nothrow_swappable<_Compare>::value)
443 : { _M_t.swap(__x._M_t); }
444 :
445 : // insert/erase
446 : #if __cplusplus >= 201103L
447 : /**
448 : * @brief Attempts to build and insert an element into the %set.
449 : * @param __args Arguments used to generate an element.
450 : * @return A pair, of which the first element is an iterator that points
451 : * to the possibly inserted element, and the second is a bool
452 : * that is true if the element was actually inserted.
453 : *
454 : * This function attempts to build and insert an element into the %set.
455 : * A %set relies on unique keys and thus an element is only inserted if
456 : * it is not already present in the %set.
457 : *
458 : * Insertion requires logarithmic time.
459 : */
460 : template<typename... _Args>
461 : std::pair<iterator, bool>
462 : emplace(_Args&&... __args)
463 : { return _M_t._M_emplace_unique(std::forward<_Args>(__args)...); }
464 :
465 : /**
466 : * @brief Attempts to insert an element into the %set.
467 : * @param __pos An iterator that serves as a hint as to where the
468 : * element should be inserted.
469 : * @param __args Arguments used to generate the element to be
470 : * inserted.
471 : * @return An iterator that points to the element with key equivalent to
472 : * the one generated from @a __args (may or may not be the
473 : * element itself).
474 : *
475 : * This function is not concerned about whether the insertion took place,
476 : * and thus does not return a boolean like the single-argument emplace()
477 : * does. Note that the first parameter is only a hint and can
478 : * potentially improve the performance of the insertion process. A bad
479 : * hint would cause no gains in efficiency.
480 : *
481 : * For more on @a hinting, see:
482 : * https://gcc.gnu.org/onlinedocs/libstdc++/manual/associative.html#containers.associative.insert_hints
483 : *
484 : * Insertion requires logarithmic time (if the hint is not taken).
485 : */
486 : template<typename... _Args>
487 : iterator
488 : emplace_hint(const_iterator __pos, _Args&&... __args)
489 : {
490 : return _M_t._M_emplace_hint_unique(__pos,
491 : std::forward<_Args>(__args)...);
492 : }
493 : #endif
494 :
495 : /**
496 : * @brief Attempts to insert an element into the %set.
497 : * @param __x Element to be inserted.
498 : * @return A pair, of which the first element is an iterator that points
499 : * to the possibly inserted element, and the second is a bool
500 : * that is true if the element was actually inserted.
501 : *
502 : * This function attempts to insert an element into the %set. A %set
503 : * relies on unique keys and thus an element is only inserted if it is
504 : * not already present in the %set.
505 : *
506 : * Insertion requires logarithmic time.
507 : */
508 : std::pair<iterator, bool>
509 1430 : insert(const value_type& __x)
510 : {
511 1430 : std::pair<typename _Rep_type::iterator, bool> __p =
512 : _M_t._M_insert_unique(__x);
513 1430 : return std::pair<iterator, bool>(__p.first, __p.second);
514 : }
515 :
516 : #if __cplusplus >= 201103L
517 : std::pair<iterator, bool>
518 227 : insert(value_type&& __x)
519 : {
520 227 : std::pair<typename _Rep_type::iterator, bool> __p =
521 227 : _M_t._M_insert_unique(std::move(__x));
522 227 : return std::pair<iterator, bool>(__p.first, __p.second);
523 : }
524 : #endif
525 :
526 : /**
527 : * @brief Attempts to insert an element into the %set.
528 : * @param __position An iterator that serves as a hint as to where the
529 : * element should be inserted.
530 : * @param __x Element to be inserted.
531 : * @return An iterator that points to the element with key of
532 : * @a __x (may or may not be the element passed in).
533 : *
534 : * This function is not concerned about whether the insertion took place,
535 : * and thus does not return a boolean like the single-argument insert()
536 : * does. Note that the first parameter is only a hint and can
537 : * potentially improve the performance of the insertion process. A bad
538 : * hint would cause no gains in efficiency.
539 : *
540 : * For more on @a hinting, see:
541 : * https://gcc.gnu.org/onlinedocs/libstdc++/manual/associative.html#containers.associative.insert_hints
542 : *
543 : * Insertion requires logarithmic time (if the hint is not taken).
544 : */
545 : iterator
546 : insert(const_iterator __position, const value_type& __x)
547 : { return _M_t._M_insert_unique_(__position, __x); }
548 :
549 : #if __cplusplus >= 201103L
550 : iterator
551 : insert(const_iterator __position, value_type&& __x)
552 : { return _M_t._M_insert_unique_(__position, std::move(__x)); }
553 : #endif
554 :
555 : /**
556 : * @brief A template function that attempts to insert a range
557 : * of elements.
558 : * @param __first Iterator pointing to the start of the range to be
559 : * inserted.
560 : * @param __last Iterator pointing to the end of the range.
561 : *
562 : * Complexity similar to that of the range constructor.
563 : */
564 : template<typename _InputIterator>
565 : void
566 : insert(_InputIterator __first, _InputIterator __last)
567 : { _M_t._M_insert_unique(__first, __last); }
568 :
569 : #if __cplusplus >= 201103L
570 : /**
571 : * @brief Attempts to insert a list of elements into the %set.
572 : * @param __l A std::initializer_list<value_type> of elements
573 : * to be inserted.
574 : *
575 : * Complexity similar to that of the range constructor.
576 : */
577 : void
578 : insert(initializer_list<value_type> __l)
579 : { this->insert(__l.begin(), __l.end()); }
580 : #endif
581 :
582 : #if __cplusplus > 201402L
583 : /// Extract a node.
584 : node_type
585 : extract(const_iterator __pos)
586 : {
587 : __glibcxx_assert(__pos != end());
588 : return _M_t.extract(__pos);
589 : }
590 :
591 : /// Extract a node.
592 : node_type
593 : extract(const key_type& __x)
594 : { return _M_t.extract(__x); }
595 :
596 : /// Re-insert an extracted node.
597 : insert_return_type
598 : insert(node_type&& __nh)
599 : { return _M_t._M_reinsert_node_unique(std::move(__nh)); }
600 :
601 : /// Re-insert an extracted node.
602 : iterator
603 : insert(const_iterator __hint, node_type&& __nh)
604 : { return _M_t._M_reinsert_node_hint_unique(__hint, std::move(__nh)); }
605 :
606 : template<typename, typename>
607 : friend class std::_Rb_tree_merge_helper;
608 :
609 : template<typename _Compare1>
610 : void
611 : merge(set<_Key, _Compare1, _Alloc>& __source)
612 : {
613 : using _Merge_helper = _Rb_tree_merge_helper<set, _Compare1>;
614 : _M_t._M_merge_unique(_Merge_helper::_S_get_tree(__source));
615 : }
616 :
617 : template<typename _Compare1>
618 : void
619 : merge(set<_Key, _Compare1, _Alloc>&& __source)
620 : { merge(__source); }
621 :
622 : template<typename _Compare1>
623 : void
624 : merge(multiset<_Key, _Compare1, _Alloc>& __source)
625 : {
626 : using _Merge_helper = _Rb_tree_merge_helper<set, _Compare1>;
627 : _M_t._M_merge_unique(_Merge_helper::_S_get_tree(__source));
628 : }
629 :
630 : template<typename _Compare1>
631 : void
632 : merge(multiset<_Key, _Compare1, _Alloc>&& __source)
633 : { merge(__source); }
634 : #endif // C++17
635 :
636 : #if __cplusplus >= 201103L
637 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
638 : // DR 130. Associative erase should return an iterator.
639 : /**
640 : * @brief Erases an element from a %set.
641 : * @param __position An iterator pointing to the element to be erased.
642 : * @return An iterator pointing to the element immediately following
643 : * @a __position prior to the element being erased. If no such
644 : * element exists, end() is returned.
645 : *
646 : * This function erases an element, pointed to by the given iterator,
647 : * from a %set. Note that this function only erases the element, and
648 : * that if the element is itself a pointer, the pointed-to memory is not
649 : * touched in any way. Managing the pointer is the user's
650 : * responsibility.
651 : */
652 : _GLIBCXX_ABI_TAG_CXX11
653 : iterator
654 : erase(const_iterator __position)
655 : { return _M_t.erase(__position); }
656 : #else
657 : /**
658 : * @brief Erases an element from a %set.
659 : * @param position An iterator pointing to the element to be erased.
660 : *
661 : * This function erases an element, pointed to by the given iterator,
662 : * from a %set. Note that this function only erases the element, and
663 : * that if the element is itself a pointer, the pointed-to memory is not
664 : * touched in any way. Managing the pointer is the user's
665 : * responsibility.
666 : */
667 : void
668 : erase(iterator __position)
669 : { _M_t.erase(__position); }
670 : #endif
671 :
672 : /**
673 : * @brief Erases elements according to the provided key.
674 : * @param __x Key of element to be erased.
675 : * @return The number of elements erased.
676 : *
677 : * This function erases all the elements located by the given key from
678 : * a %set.
679 : * Note that this function only erases the element, and that if
680 : * the element is itself a pointer, the pointed-to memory is not touched
681 : * in any way. Managing the pointer is the user's responsibility.
682 : */
683 : size_type
684 : erase(const key_type& __x)
685 : { return _M_t.erase(__x); }
686 :
687 : #if __cplusplus >= 201103L
688 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
689 : // DR 130. Associative erase should return an iterator.
690 : /**
691 : * @brief Erases a [__first,__last) range of elements from a %set.
692 : * @param __first Iterator pointing to the start of the range to be
693 : * erased.
694 :
695 : * @param __last Iterator pointing to the end of the range to
696 : * be erased.
697 : * @return The iterator @a __last.
698 : *
699 : * This function erases a sequence of elements from a %set.
700 : * Note that this function only erases the element, and that if
701 : * the element is itself a pointer, the pointed-to memory is not touched
702 : * in any way. Managing the pointer is the user's responsibility.
703 : */
704 : _GLIBCXX_ABI_TAG_CXX11
705 : iterator
706 : erase(const_iterator __first, const_iterator __last)
707 : { return _M_t.erase(__first, __last); }
708 : #else
709 : /**
710 : * @brief Erases a [first,last) range of elements from a %set.
711 : * @param __first Iterator pointing to the start of the range to be
712 : * erased.
713 : * @param __last Iterator pointing to the end of the range to
714 : * be erased.
715 : *
716 : * This function erases a sequence of elements from a %set.
717 : * Note that this function only erases the element, and that if
718 : * the element is itself a pointer, the pointed-to memory is not touched
719 : * in any way. Managing the pointer is the user's responsibility.
720 : */
721 : void
722 : erase(iterator __first, iterator __last)
723 : { _M_t.erase(__first, __last); }
724 : #endif
725 :
726 : /**
727 : * Erases all elements in a %set. Note that this function only erases
728 : * the elements, and that if the elements themselves are pointers, the
729 : * pointed-to memory is not touched in any way. Managing the pointer is
730 : * the user's responsibility.
731 : */
732 : void
733 : clear() _GLIBCXX_NOEXCEPT
734 : { _M_t.clear(); }
735 :
736 : // set operations:
737 :
738 : //@{
739 : /**
740 : * @brief Finds the number of elements.
741 : * @param __x Element to located.
742 : * @return Number of elements with specified key.
743 : *
744 : * This function only makes sense for multisets; for set the result will
745 : * either be 0 (not present) or 1 (present).
746 : */
747 : size_type
748 : count(const key_type& __x) const
749 : { return _M_t.find(__x) == _M_t.end() ? 0 : 1; }
750 :
751 : #if __cplusplus > 201103L
752 : template<typename _Kt>
753 : auto
754 : count(const _Kt& __x) const
755 : -> decltype(_M_t._M_count_tr(__x))
756 : { return _M_t._M_count_tr(__x); }
757 : #endif
758 : //@}
759 :
760 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
761 : // 214. set::find() missing const overload
762 : //@{
763 : /**
764 : * @brief Tries to locate an element in a %set.
765 : * @param __x Element to be located.
766 : * @return Iterator pointing to sought-after element, or end() if not
767 : * found.
768 : *
769 : * This function takes a key and tries to locate the element with which
770 : * the key matches. If successful the function returns an iterator
771 : * pointing to the sought after element. If unsuccessful it returns the
772 : * past-the-end ( @c end() ) iterator.
773 : */
774 : iterator
775 2709 : find(const key_type& __x)
776 2709 : { return _M_t.find(__x); }
777 :
778 : const_iterator
779 : find(const key_type& __x) const
780 : { return _M_t.find(__x); }
781 :
782 : #if __cplusplus > 201103L
783 : template<typename _Kt>
784 : auto
785 : find(const _Kt& __x)
786 : -> decltype(iterator{_M_t._M_find_tr(__x)})
787 : { return iterator{_M_t._M_find_tr(__x)}; }
788 :
789 : template<typename _Kt>
790 : auto
791 : find(const _Kt& __x) const
792 : -> decltype(const_iterator{_M_t._M_find_tr(__x)})
793 : { return const_iterator{_M_t._M_find_tr(__x)}; }
794 : #endif
795 : //@}
796 :
797 : //@{
798 : /**
799 : * @brief Finds the beginning of a subsequence matching given key.
800 : * @param __x Key to be located.
801 : * @return Iterator pointing to first element equal to or greater
802 : * than key, or end().
803 : *
804 : * This function returns the first element of a subsequence of elements
805 : * that matches the given key. If unsuccessful it returns an iterator
806 : * pointing to the first element that has a greater value than given key
807 : * or end() if no such element exists.
808 : */
809 : iterator
810 : lower_bound(const key_type& __x)
811 : { return _M_t.lower_bound(__x); }
812 :
813 : const_iterator
814 : lower_bound(const key_type& __x) const
815 : { return _M_t.lower_bound(__x); }
816 :
817 : #if __cplusplus > 201103L
818 : template<typename _Kt>
819 : auto
820 : lower_bound(const _Kt& __x)
821 : -> decltype(iterator(_M_t._M_lower_bound_tr(__x)))
822 : { return iterator(_M_t._M_lower_bound_tr(__x)); }
823 :
824 : template<typename _Kt>
825 : auto
826 : lower_bound(const _Kt& __x) const
827 : -> decltype(const_iterator(_M_t._M_lower_bound_tr(__x)))
828 : { return const_iterator(_M_t._M_lower_bound_tr(__x)); }
829 : #endif
830 : //@}
831 :
832 : //@{
833 : /**
834 : * @brief Finds the end of a subsequence matching given key.
835 : * @param __x Key to be located.
836 : * @return Iterator pointing to the first element
837 : * greater than key, or end().
838 : */
839 : iterator
840 : upper_bound(const key_type& __x)
841 : { return _M_t.upper_bound(__x); }
842 :
843 : const_iterator
844 : upper_bound(const key_type& __x) const
845 : { return _M_t.upper_bound(__x); }
846 :
847 : #if __cplusplus > 201103L
848 : template<typename _Kt>
849 : auto
850 : upper_bound(const _Kt& __x)
851 : -> decltype(iterator(_M_t._M_upper_bound_tr(__x)))
852 : { return iterator(_M_t._M_upper_bound_tr(__x)); }
853 :
854 : template<typename _Kt>
855 : auto
856 : upper_bound(const _Kt& __x) const
857 : -> decltype(iterator(_M_t._M_upper_bound_tr(__x)))
858 : { return const_iterator(_M_t._M_upper_bound_tr(__x)); }
859 : #endif
860 : //@}
861 :
862 : //@{
863 : /**
864 : * @brief Finds a subsequence matching given key.
865 : * @param __x Key to be located.
866 : * @return Pair of iterators that possibly points to the subsequence
867 : * matching given key.
868 : *
869 : * This function is equivalent to
870 : * @code
871 : * std::make_pair(c.lower_bound(val),
872 : * c.upper_bound(val))
873 : * @endcode
874 : * (but is faster than making the calls separately).
875 : *
876 : * This function probably only makes sense for multisets.
877 : */
878 : std::pair<iterator, iterator>
879 : equal_range(const key_type& __x)
880 : { return _M_t.equal_range(__x); }
881 :
882 : std::pair<const_iterator, const_iterator>
883 : equal_range(const key_type& __x) const
884 : { return _M_t.equal_range(__x); }
885 :
886 : #if __cplusplus > 201103L
887 : template<typename _Kt>
888 : auto
889 : equal_range(const _Kt& __x)
890 : -> decltype(pair<iterator, iterator>(_M_t._M_equal_range_tr(__x)))
891 : { return pair<iterator, iterator>(_M_t._M_equal_range_tr(__x)); }
892 :
893 : template<typename _Kt>
894 : auto
895 : equal_range(const _Kt& __x) const
896 : -> decltype(pair<iterator, iterator>(_M_t._M_equal_range_tr(__x)))
897 : { return pair<iterator, iterator>(_M_t._M_equal_range_tr(__x)); }
898 : #endif
899 : //@}
900 :
901 : template<typename _K1, typename _C1, typename _A1>
902 : friend bool
903 : operator==(const set<_K1, _C1, _A1>&, const set<_K1, _C1, _A1>&);
904 :
905 : template<typename _K1, typename _C1, typename _A1>
906 : friend bool
907 : operator<(const set<_K1, _C1, _A1>&, const set<_K1, _C1, _A1>&);
908 : };
909 :
910 : #if __cpp_deduction_guides >= 201606
911 :
912 : template<typename _InputIterator,
913 : typename _Compare =
914 : less<typename iterator_traits<_InputIterator>::value_type>,
915 : typename _Allocator =
916 : allocator<typename iterator_traits<_InputIterator>::value_type>,
917 : typename = _RequireInputIter<_InputIterator>,
918 : typename = _RequireAllocator<_Allocator>>
919 : set(_InputIterator, _InputIterator,
920 : _Compare = _Compare(), _Allocator = _Allocator())
921 : -> set<typename iterator_traits<_InputIterator>::value_type,
922 : _Compare, _Allocator>;
923 :
924 : template<typename _Key, typename _Compare = less<_Key>,
925 : typename _Allocator = allocator<_Key>,
926 : typename = _RequireAllocator<_Allocator>>
927 : set(initializer_list<_Key>,
928 : _Compare = _Compare(), _Allocator = _Allocator())
929 : -> set<_Key, _Compare, _Allocator>;
930 :
931 : template<typename _InputIterator, typename _Allocator,
932 : typename = _RequireInputIter<_InputIterator>,
933 : typename = _RequireAllocator<_Allocator>>
934 : set(_InputIterator, _InputIterator, _Allocator)
935 : -> set<typename iterator_traits<_InputIterator>::value_type,
936 : less<typename iterator_traits<_InputIterator>::value_type>,
937 : _Allocator>;
938 :
939 : template<typename _Key, typename _Allocator,
940 : typename = _RequireAllocator<_Allocator>>
941 : set(initializer_list<_Key>, _Allocator)
942 : -> set<_Key, less<_Key>, _Allocator>;
943 :
944 : #endif
945 :
946 : /**
947 : * @brief Set equality comparison.
948 : * @param __x A %set.
949 : * @param __y A %set of the same type as @a x.
950 : * @return True iff the size and elements of the sets are equal.
951 : *
952 : * This is an equivalence relation. It is linear in the size of the sets.
953 : * Sets are considered equivalent if their sizes are equal, and if
954 : * corresponding elements compare equal.
955 : */
956 : template<typename _Key, typename _Compare, typename _Alloc>
957 : inline bool
958 : operator==(const set<_Key, _Compare, _Alloc>& __x,
959 : const set<_Key, _Compare, _Alloc>& __y)
960 : { return __x._M_t == __y._M_t; }
961 :
962 : /**
963 : * @brief Set ordering relation.
964 : * @param __x A %set.
965 : * @param __y A %set of the same type as @a x.
966 : * @return True iff @a __x is lexicographically less than @a __y.
967 : *
968 : * This is a total ordering relation. It is linear in the size of the
969 : * sets. The elements must be comparable with @c <.
970 : *
971 : * See std::lexicographical_compare() for how the determination is made.
972 : */
973 : template<typename _Key, typename _Compare, typename _Alloc>
974 : inline bool
975 : operator<(const set<_Key, _Compare, _Alloc>& __x,
976 : const set<_Key, _Compare, _Alloc>& __y)
977 : { return __x._M_t < __y._M_t; }
978 :
979 : /// Returns !(x == y).
980 : template<typename _Key, typename _Compare, typename _Alloc>
981 : inline bool
982 : operator!=(const set<_Key, _Compare, _Alloc>& __x,
983 : const set<_Key, _Compare, _Alloc>& __y)
984 : { return !(__x == __y); }
985 :
986 : /// Returns y < x.
987 : template<typename _Key, typename _Compare, typename _Alloc>
988 : inline bool
989 : operator>(const set<_Key, _Compare, _Alloc>& __x,
990 : const set<_Key, _Compare, _Alloc>& __y)
991 : { return __y < __x; }
992 :
993 : /// Returns !(y < x)
994 : template<typename _Key, typename _Compare, typename _Alloc>
995 : inline bool
996 : operator<=(const set<_Key, _Compare, _Alloc>& __x,
997 : const set<_Key, _Compare, _Alloc>& __y)
998 : { return !(__y < __x); }
999 :
1000 : /// Returns !(x < y)
1001 : template<typename _Key, typename _Compare, typename _Alloc>
1002 : inline bool
1003 : operator>=(const set<_Key, _Compare, _Alloc>& __x,
1004 : const set<_Key, _Compare, _Alloc>& __y)
1005 : { return !(__x < __y); }
1006 :
1007 : /// See std::set::swap().
1008 : template<typename _Key, typename _Compare, typename _Alloc>
1009 : inline void
1010 : swap(set<_Key, _Compare, _Alloc>& __x, set<_Key, _Compare, _Alloc>& __y)
1011 : _GLIBCXX_NOEXCEPT_IF(noexcept(__x.swap(__y)))
1012 : { __x.swap(__y); }
1013 :
1014 : _GLIBCXX_END_NAMESPACE_CONTAINER
1015 :
1016 : #if __cplusplus > 201402L
1017 : // Allow std::set access to internals of compatible sets.
1018 : template<typename _Val, typename _Cmp1, typename _Alloc, typename _Cmp2>
1019 : struct
1020 : _Rb_tree_merge_helper<_GLIBCXX_STD_C::set<_Val, _Cmp1, _Alloc>, _Cmp2>
1021 : {
1022 : private:
1023 : friend class _GLIBCXX_STD_C::set<_Val, _Cmp1, _Alloc>;
1024 :
1025 : static auto&
1026 : _S_get_tree(_GLIBCXX_STD_C::set<_Val, _Cmp2, _Alloc>& __set)
1027 : { return __set._M_t; }
1028 :
1029 : static auto&
1030 : _S_get_tree(_GLIBCXX_STD_C::multiset<_Val, _Cmp2, _Alloc>& __set)
1031 : { return __set._M_t; }
1032 : };
1033 : #endif // C++17
1034 :
1035 : _GLIBCXX_END_NAMESPACE_VERSION
1036 : } //namespace std
1037 : #endif /* _STL_SET_H */
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