File Coverage

/usr/include/c++/5/bits/stl_set.h
Criterion Covered Total %
statement 12 12 100.0
branch 2 4 50.0
condition n/a
subroutine n/a
pod n/a
total 14 16 87.5


line stmt bran cond sub pod time code
1             // Set implementation -*- C++ -*-
2              
3             // Copyright (C) 2001-2015 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             // .
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
60             #if __cplusplus >= 201103L
61             #include
62             #endif
63              
64             namespace std _GLIBCXX_VISIBILITY(default)
65             {
66             _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
67              
68             /**
69             * @brief A standard container made up of unique keys, which can be
70             * retrieved in logarithmic time.
71             *
72             * @ingroup associative_containers
73             *
74             * @tparam _Key Type of key objects.
75             * @tparam _Compare Comparison function object type, defaults to less<_Key>.
76             * @tparam _Alloc Allocator type, defaults to allocator<_Key>.
77             *
78             * Meets the requirements of a container, a
79             * reversible container, and an
80             * associative container (using unique keys).
81             *
82             * Sets support bidirectional iterators.
83             *
84             * The private tree data is declared exactly the same way for set and
85             * multiset; the distinction is made entirely in how the tree functions are
86             * called (*_unique versus *_equal, same as the standard).
87             */
88             template,
89             typename _Alloc = std::allocator<_Key> >
90 18 50         class set
91             {
92             // concept requirements
93             typedef typename _Alloc::value_type _Alloc_value_type;
94             __glibcxx_class_requires(_Key, _SGIAssignableConcept)
95             __glibcxx_class_requires4(_Compare, bool, _Key, _Key,
96             _BinaryFunctionConcept)
97             __glibcxx_class_requires2(_Key, _Alloc_value_type, _SameTypeConcept)
98              
99             public:
100             // typedefs:
101             //@{
102             /// Public typedefs.
103             typedef _Key key_type;
104             typedef _Key value_type;
105             typedef _Compare key_compare;
106             typedef _Compare value_compare;
107             typedef _Alloc allocator_type;
108             //@}
109              
110             private:
111             typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
112             rebind<_Key>::other _Key_alloc_type;
113              
114             typedef _Rb_tree,
115             key_compare, _Key_alloc_type> _Rep_type;
116             _Rep_type _M_t; // Red-black tree representing set.
117              
118             typedef __gnu_cxx::__alloc_traits<_Key_alloc_type> _Alloc_traits;
119              
120             public:
121             //@{
122             /// Iterator-related typedefs.
123             typedef typename _Alloc_traits::pointer pointer;
124             typedef typename _Alloc_traits::const_pointer const_pointer;
125             typedef typename _Alloc_traits::reference reference;
126             typedef typename _Alloc_traits::const_reference const_reference;
127             // _GLIBCXX_RESOLVE_LIB_DEFECTS
128             // DR 103. set::iterator is required to be modifiable,
129             // but this allows modification of keys.
130             typedef typename _Rep_type::const_iterator iterator;
131             typedef typename _Rep_type::const_iterator const_iterator;
132             typedef typename _Rep_type::const_reverse_iterator reverse_iterator;
133             typedef typename _Rep_type::const_reverse_iterator const_reverse_iterator;
134             typedef typename _Rep_type::size_type size_type;
135             typedef typename _Rep_type::difference_type difference_type;
136             //@}
137              
138             // allocation/deallocation
139             /**
140             * @brief Default constructor creates no elements.
141             */
142 18           set()
143             #if __cplusplus >= 201103L
144             noexcept(is_nothrow_default_constructible::value)
145             #endif
146 18           : _M_t() { }
147              
148             /**
149             * @brief Creates a %set with no elements.
150             * @param __comp Comparator to use.
151             * @param __a An allocator object.
152             */
153             explicit
154             set(const _Compare& __comp,
155             const allocator_type& __a = allocator_type())
156             : _M_t(__comp, _Key_alloc_type(__a)) { }
157              
158             /**
159             * @brief Builds a %set from a range.
160             * @param __first An input iterator.
161             * @param __last An input iterator.
162             *
163             * Create a %set consisting of copies of the elements from
164             * [__first,__last). This is linear in N if the range is
165             * already sorted, and NlogN otherwise (where N is
166             * distance(__first,__last)).
167             */
168             template
169             set(_InputIterator __first, _InputIterator __last)
170             : _M_t()
171             { _M_t._M_insert_unique(__first, __last); }
172              
173             /**
174             * @brief Builds a %set from a range.
175             * @param __first An input iterator.
176             * @param __last An input iterator.
177             * @param __comp A comparison functor.
178             * @param __a An allocator object.
179             *
180             * Create a %set consisting of copies of the elements from
181             * [__first,__last). This is linear in N if the range is
182             * already sorted, and NlogN otherwise (where N is
183             * distance(__first,__last)).
184             */
185             template
186             set(_InputIterator __first, _InputIterator __last,
187             const _Compare& __comp,
188             const allocator_type& __a = allocator_type())
189             : _M_t(__comp, _Key_alloc_type(__a))
190             { _M_t._M_insert_unique(__first, __last); }
191              
192             /**
193             * @brief %Set copy constructor.
194             * @param __x A %set of identical element and allocator types.
195             *
196             * The newly-created %set uses a copy of the allocation object used
197             * by @a __x.
198             */
199             set(const set& __x)
200             : _M_t(__x._M_t) { }
201              
202             #if __cplusplus >= 201103L
203             /**
204             * @brief %Set move constructor
205             * @param __x A %set of identical element and allocator types.
206             *
207             * The newly-created %set contains the exact contents of @a x.
208             * The contents of @a x are a valid, but unspecified %set.
209             */
210             set(set&& __x)
211             noexcept(is_nothrow_copy_constructible<_Compare>::value)
212             : _M_t(std::move(__x._M_t)) { }
213              
214             /**
215             * @brief Builds a %set from an initializer_list.
216             * @param __l An initializer_list.
217             * @param __comp A comparison functor.
218             * @param __a An allocator object.
219             *
220             * Create a %set consisting of copies of the elements in the list.
221             * This is linear in N if the list is already sorted, and NlogN
222             * otherwise (where N is @a __l.size()).
223             */
224             set(initializer_list __l,
225             const _Compare& __comp = _Compare(),
226             const allocator_type& __a = allocator_type())
227             : _M_t(__comp, _Key_alloc_type(__a))
228             { _M_t._M_insert_unique(__l.begin(), __l.end()); }
229              
230             /// Allocator-extended default constructor.
231             explicit
232             set(const allocator_type& __a)
233             : _M_t(_Compare(), _Key_alloc_type(__a)) { }
234              
235             /// Allocator-extended copy constructor.
236             set(const set& __x, const allocator_type& __a)
237             : _M_t(__x._M_t, _Key_alloc_type(__a)) { }
238              
239             /// Allocator-extended move constructor.
240             set(set&& __x, const allocator_type& __a)
241             noexcept(is_nothrow_copy_constructible<_Compare>::value
242             && _Alloc_traits::_S_always_equal())
243             : _M_t(std::move(__x._M_t), _Key_alloc_type(__a)) { }
244              
245             /// Allocator-extended initialier-list constructor.
246             set(initializer_list __l, const allocator_type& __a)
247             : _M_t(_Compare(), _Key_alloc_type(__a))
248             { _M_t._M_insert_unique(__l.begin(), __l.end()); }
249              
250             /// Allocator-extended range constructor.
251             template
252             set(_InputIterator __first, _InputIterator __last,
253             const allocator_type& __a)
254             : _M_t(_Compare(), _Key_alloc_type(__a))
255             { _M_t._M_insert_unique(__first, __last); }
256             #endif
257              
258             /**
259             * @brief %Set assignment operator.
260             * @param __x A %set of identical element and allocator types.
261             *
262             * All the elements of @a __x are copied, but unlike the copy
263             * constructor, the allocator object is not copied.
264             */
265             set&
266             operator=(const set& __x)
267             {
268             _M_t = __x._M_t;
269             return *this;
270             }
271              
272             #if __cplusplus >= 201103L
273             /// Move assignment operator.
274             set&
275             operator=(set&&) = default;
276              
277             /**
278             * @brief %Set list assignment operator.
279             * @param __l An initializer_list.
280             *
281             * This function fills a %set with copies of the elements in the
282             * initializer list @a __l.
283             *
284             * Note that the assignment completely changes the %set and
285             * that the resulting %set's size is the same as the number
286             * of elements assigned. Old data may be lost.
287             */
288             set&
289             operator=(initializer_list __l)
290             {
291             _M_t._M_assign_unique(__l.begin(), __l.end());
292             return *this;
293             }
294             #endif
295              
296             // accessors:
297              
298             /// Returns the comparison object with which the %set was constructed.
299             key_compare
300             key_comp() const
301             { return _M_t.key_comp(); }
302             /// Returns the comparison object with which the %set was constructed.
303             value_compare
304             value_comp() const
305             { return _M_t.key_comp(); }
306             /// Returns the allocator object with which the %set was constructed.
307             allocator_type
308             get_allocator() const _GLIBCXX_NOEXCEPT
309             { return allocator_type(_M_t.get_allocator()); }
310              
311             /**
312             * Returns a read-only (constant) iterator that points to the first
313             * element in the %set. Iteration is done in ascending order according
314             * to the keys.
315             */
316             iterator
317             begin() const _GLIBCXX_NOEXCEPT
318             { return _M_t.begin(); }
319              
320             /**
321             * Returns a read-only (constant) iterator that points one past the last
322             * element in the %set. Iteration is done in ascending order according
323             * to the keys.
324             */
325             iterator
326 436           end() const _GLIBCXX_NOEXCEPT
327 436           { return _M_t.end(); }
328              
329             /**
330             * Returns a read-only (constant) iterator that points to the last
331             * element in the %set. Iteration is done in descending order according
332             * to the keys.
333             */
334             reverse_iterator
335             rbegin() const _GLIBCXX_NOEXCEPT
336             { return _M_t.rbegin(); }
337              
338             /**
339             * Returns a read-only (constant) reverse iterator that points to the
340             * last pair in the %set. Iteration is done in descending order
341             * according to the keys.
342             */
343             reverse_iterator
344             rend() const _GLIBCXX_NOEXCEPT
345             { return _M_t.rend(); }
346              
347             #if __cplusplus >= 201103L
348             /**
349             * Returns a read-only (constant) iterator that points to the first
350             * element in the %set. Iteration is done in ascending order according
351             * to the keys.
352             */
353             iterator
354             cbegin() const noexcept
355             { return _M_t.begin(); }
356              
357             /**
358             * Returns a read-only (constant) iterator that points one past the last
359             * element in the %set. Iteration is done in ascending order according
360             * to the keys.
361             */
362             iterator
363             cend() const noexcept
364             { return _M_t.end(); }
365              
366             /**
367             * Returns a read-only (constant) iterator that points to the last
368             * element in the %set. Iteration is done in descending order according
369             * to the keys.
370             */
371             reverse_iterator
372             crbegin() const noexcept
373             { return _M_t.rbegin(); }
374              
375             /**
376             * Returns a read-only (constant) reverse iterator that points to the
377             * last pair in the %set. Iteration is done in descending order
378             * according to the keys.
379             */
380             reverse_iterator
381             crend() const noexcept
382             { return _M_t.rend(); }
383             #endif
384              
385             /// Returns true if the %set is empty.
386             bool
387 436           empty() const _GLIBCXX_NOEXCEPT
388 436           { return _M_t.empty(); }
389              
390             /// Returns the size of the %set.
391             size_type
392             size() const _GLIBCXX_NOEXCEPT
393             { return _M_t.size(); }
394              
395             /// Returns the maximum size of the %set.
396             size_type
397             max_size() const _GLIBCXX_NOEXCEPT
398             { return _M_t.max_size(); }
399              
400             /**
401             * @brief Swaps data with another %set.
402             * @param __x A %set of the same element and allocator types.
403             *
404             * This exchanges the elements between two sets in constant
405             * time. (It is only swapping a pointer, an integer, and an
406             * instance of the @c Compare type (which itself is often
407             * stateless and empty), so it should be quite fast.) Note
408             * that the global std::swap() function is specialized such
409             * that std::swap(s1,s2) will feed to this function.
410             */
411             void
412             swap(set& __x)
413             #if __cplusplus >= 201103L
414             noexcept(_Alloc_traits::_S_nothrow_swap())
415             #endif
416             { _M_t.swap(__x._M_t); }
417              
418             // insert/erase
419             #if __cplusplus >= 201103L
420             /**
421             * @brief Attempts to build and insert an element into the %set.
422             * @param __args Arguments used to generate an element.
423             * @return A pair, of which the first element is an iterator that points
424             * to the possibly inserted element, and the second is a bool
425             * that is true if the element was actually inserted.
426             *
427             * This function attempts to build and insert an element into the %set.
428             * A %set relies on unique keys and thus an element is only inserted if
429             * it is not already present in the %set.
430             *
431             * Insertion requires logarithmic time.
432             */
433             template
434             std::pair
435             emplace(_Args&&... __args)
436             { return _M_t._M_emplace_unique(std::forward<_Args>(__args)...); }
437              
438             /**
439             * @brief Attempts to insert an element into the %set.
440             * @param __pos An iterator that serves as a hint as to where the
441             * element should be inserted.
442             * @param __args Arguments used to generate the element to be
443             * inserted.
444             * @return An iterator that points to the element with key equivalent to
445             * the one generated from @a __args (may or may not be the
446             * element itself).
447             *
448             * This function is not concerned about whether the insertion took place,
449             * and thus does not return a boolean like the single-argument emplace()
450             * does. Note that the first parameter is only a hint and can
451             * potentially improve the performance of the insertion process. A bad
452             * hint would cause no gains in efficiency.
453             *
454             * For more on @a hinting, see:
455             * https://gcc.gnu.org/onlinedocs/libstdc++/manual/associative.html#containers.associative.insert_hints
456             *
457             * Insertion requires logarithmic time (if the hint is not taken).
458             */
459             template
460             iterator
461             emplace_hint(const_iterator __pos, _Args&&... __args)
462             {
463             return _M_t._M_emplace_hint_unique(__pos,
464             std::forward<_Args>(__args)...);
465             }
466             #endif
467              
468             /**
469             * @brief Attempts to insert an element into the %set.
470             * @param __x Element to be inserted.
471             * @return A pair, of which the first element is an iterator that points
472             * to the possibly inserted element, and the second is a bool
473             * that is true if the element was actually inserted.
474             *
475             * This function attempts to insert an element into the %set. A %set
476             * relies on unique keys and thus an element is only inserted if it is
477             * not already present in the %set.
478             *
479             * Insertion requires logarithmic time.
480             */
481             std::pair
482 4482           insert(const value_type& __x)
483             {
484             std::pair __p =
485 4482 50         _M_t._M_insert_unique(__x);
486 4482           return std::pair(__p.first, __p.second);
487             }
488              
489             #if __cplusplus >= 201103L
490             std::pair
491             insert(value_type&& __x)
492             {
493             std::pair __p =
494             _M_t._M_insert_unique(std::move(__x));
495             return std::pair(__p.first, __p.second);
496             }
497             #endif
498              
499             /**
500             * @brief Attempts to insert an element into the %set.
501             * @param __position An iterator that serves as a hint as to where the
502             * element should be inserted.
503             * @param __x Element to be inserted.
504             * @return An iterator that points to the element with key of
505             * @a __x (may or may not be the element passed in).
506             *
507             * This function is not concerned about whether the insertion took place,
508             * and thus does not return a boolean like the single-argument insert()
509             * does. Note that the first parameter is only a hint and can
510             * potentially improve the performance of the insertion process. A bad
511             * hint would cause no gains in efficiency.
512             *
513             * For more on @a hinting, see:
514             * https://gcc.gnu.org/onlinedocs/libstdc++/manual/associative.html#containers.associative.insert_hints
515             *
516             * Insertion requires logarithmic time (if the hint is not taken).
517             */
518             iterator
519             insert(const_iterator __position, const value_type& __x)
520             { return _M_t._M_insert_unique_(__position, __x); }
521              
522             #if __cplusplus >= 201103L
523             iterator
524             insert(const_iterator __position, value_type&& __x)
525             { return _M_t._M_insert_unique_(__position, std::move(__x)); }
526             #endif
527              
528             /**
529             * @brief A template function that attempts to insert a range
530             * of elements.
531             * @param __first Iterator pointing to the start of the range to be
532             * inserted.
533             * @param __last Iterator pointing to the end of the range.
534             *
535             * Complexity similar to that of the range constructor.
536             */
537             template
538             void
539             insert(_InputIterator __first, _InputIterator __last)
540             { _M_t._M_insert_unique(__first, __last); }
541              
542             #if __cplusplus >= 201103L
543             /**
544             * @brief Attempts to insert a list of elements into the %set.
545             * @param __l A std::initializer_list of elements
546             * to be inserted.
547             *
548             * Complexity similar to that of the range constructor.
549             */
550             void
551             insert(initializer_list __l)
552             { this->insert(__l.begin(), __l.end()); }
553             #endif
554              
555             #if __cplusplus >= 201103L
556             // _GLIBCXX_RESOLVE_LIB_DEFECTS
557             // DR 130. Associative erase should return an iterator.
558             /**
559             * @brief Erases an element from a %set.
560             * @param __position An iterator pointing to the element to be erased.
561             * @return An iterator pointing to the element immediately following
562             * @a __position prior to the element being erased. If no such
563             * element exists, end() is returned.
564             *
565             * This function erases an element, pointed to by the given iterator,
566             * from a %set. Note that this function only erases the element, and
567             * that if the element is itself a pointer, the pointed-to memory is not
568             * touched in any way. Managing the pointer is the user's
569             * responsibility.
570             */
571             _GLIBCXX_ABI_TAG_CXX11
572             iterator
573             erase(const_iterator __position)
574             { return _M_t.erase(__position); }
575             #else
576             /**
577             * @brief Erases an element from a %set.
578             * @param position An iterator pointing to the element to be erased.
579             *
580             * This function erases an element, pointed to by the given iterator,
581             * from a %set. Note that this function only erases the element, and
582             * that if the element is itself a pointer, the pointed-to memory is not
583             * touched in any way. Managing the pointer is the user's
584             * responsibility.
585             */
586             void
587             erase(iterator __position)
588             { _M_t.erase(__position); }
589             #endif
590              
591             /**
592             * @brief Erases elements according to the provided key.
593             * @param __x Key of element to be erased.
594             * @return The number of elements erased.
595             *
596             * This function erases all the elements located by the given key from
597             * a %set.
598             * Note that this function only erases the element, and that if
599             * the element is itself a pointer, the pointed-to memory is not touched
600             * in any way. Managing the pointer is the user's responsibility.
601             */
602             size_type
603             erase(const key_type& __x)
604             { return _M_t.erase(__x); }
605              
606             #if __cplusplus >= 201103L
607             // _GLIBCXX_RESOLVE_LIB_DEFECTS
608             // DR 130. Associative erase should return an iterator.
609             /**
610             * @brief Erases a [__first,__last) range of elements from a %set.
611             * @param __first Iterator pointing to the start of the range to be
612             * erased.
613              
614             * @param __last Iterator pointing to the end of the range to
615             * be erased.
616             * @return The iterator @a __last.
617             *
618             * This function erases a sequence of elements from a %set.
619             * Note that this function only erases the element, and that if
620             * the element is itself a pointer, the pointed-to memory is not touched
621             * in any way. Managing the pointer is the user's responsibility.
622             */
623             _GLIBCXX_ABI_TAG_CXX11
624             iterator
625             erase(const_iterator __first, const_iterator __last)
626             { return _M_t.erase(__first, __last); }
627             #else
628             /**
629             * @brief Erases a [first,last) range of elements from a %set.
630             * @param __first Iterator pointing to the start of the range to be
631             * erased.
632             * @param __last Iterator pointing to the end of the range to
633             * be erased.
634             *
635             * This function erases a sequence of elements from a %set.
636             * Note that this function only erases the element, and that if
637             * the element is itself a pointer, the pointed-to memory is not touched
638             * in any way. Managing the pointer is the user's responsibility.
639             */
640             void
641             erase(iterator __first, iterator __last)
642             { _M_t.erase(__first, __last); }
643             #endif
644              
645             /**
646             * Erases all elements in a %set. Note that this function only erases
647             * the elements, and that if the elements themselves are pointers, the
648             * pointed-to memory is not touched in any way. Managing the pointer is
649             * the user's responsibility.
650             */
651             void
652             clear() _GLIBCXX_NOEXCEPT
653             { _M_t.clear(); }
654              
655             // set operations:
656              
657             //@{
658             /**
659             * @brief Finds the number of elements.
660             * @param __x Element to located.
661             * @return Number of elements with specified key.
662             *
663             * This function only makes sense for multisets; for set the result will
664             * either be 0 (not present) or 1 (present).
665             */
666             size_type
667             count(const key_type& __x) const
668             { return _M_t.find(__x) == _M_t.end() ? 0 : 1; }
669              
670             #if __cplusplus > 201103L
671             template
672             auto
673             count(const _Kt& __x) const
674             -> decltype(_M_t._M_count_tr(__x))
675             { return _M_t._M_find_tr(__x) == _M_t.end() ? 0 : 1; }
676             #endif
677             //@}
678              
679             // _GLIBCXX_RESOLVE_LIB_DEFECTS
680             // 214. set::find() missing const overload
681             //@{
682             /**
683             * @brief Tries to locate an element in a %set.
684             * @param __x Element to be located.
685             * @return Iterator pointing to sought-after element, or end() if not
686             * found.
687             *
688             * This function takes a key and tries to locate the element with which
689             * the key matches. If successful the function returns an iterator
690             * pointing to the sought after element. If unsuccessful it returns the
691             * past-the-end ( @c end() ) iterator.
692             */
693             iterator
694 436           find(const key_type& __x)
695 436           { return _M_t.find(__x); }
696              
697             const_iterator
698             find(const key_type& __x) const
699             { return _M_t.find(__x); }
700              
701             #if __cplusplus > 201103L
702             template
703             auto
704             find(const _Kt& __x)
705             -> decltype(iterator{_M_t._M_find_tr(__x)})
706             { return iterator{_M_t._M_find_tr(__x)}; }
707              
708             template
709             auto
710             find(const _Kt& __x) const
711             -> decltype(const_iterator{_M_t._M_find_tr(__x)})
712             { return const_iterator{_M_t._M_find_tr(__x)}; }
713             #endif
714             //@}
715              
716             //@{
717             /**
718             * @brief Finds the beginning of a subsequence matching given key.
719             * @param __x Key to be located.
720             * @return Iterator pointing to first element equal to or greater
721             * than key, or end().
722             *
723             * This function returns the first element of a subsequence of elements
724             * that matches the given key. If unsuccessful it returns an iterator
725             * pointing to the first element that has a greater value than given key
726             * or end() if no such element exists.
727             */
728             iterator
729             lower_bound(const key_type& __x)
730             { return _M_t.lower_bound(__x); }
731              
732             const_iterator
733             lower_bound(const key_type& __x) const
734             { return _M_t.lower_bound(__x); }
735              
736             #if __cplusplus > 201103L
737             template
738             auto
739             lower_bound(const _Kt& __x)
740             -> decltype(_M_t._M_lower_bound_tr(__x))
741             { return _M_t._M_lower_bound_tr(__x); }
742              
743             template
744             auto
745             lower_bound(const _Kt& __x) const
746             -> decltype(_M_t._M_lower_bound_tr(__x))
747             { return _M_t._M_lower_bound_tr(__x); }
748             #endif
749             //@}
750              
751             //@{
752             /**
753             * @brief Finds the end of a subsequence matching given key.
754             * @param __x Key to be located.
755             * @return Iterator pointing to the first element
756             * greater than key, or end().
757             */
758             iterator
759             upper_bound(const key_type& __x)
760             { return _M_t.upper_bound(__x); }
761              
762             const_iterator
763             upper_bound(const key_type& __x) const
764             { return _M_t.upper_bound(__x); }
765              
766             #if __cplusplus > 201103L
767             template
768             auto
769             upper_bound(const _Kt& __x)
770             -> decltype(_M_t._M_upper_bound_tr(__x))
771             { return _M_t._M_upper_bound_tr(__x); }
772              
773             template
774             auto
775             upper_bound(const _Kt& __x) const
776             -> decltype(_M_t._M_upper_bound_tr(__x))
777             { return _M_t._M_upper_bound_tr(__x); }
778             #endif
779             //@}
780              
781             //@{
782             /**
783             * @brief Finds a subsequence matching given key.
784             * @param __x Key to be located.
785             * @return Pair of iterators that possibly points to the subsequence
786             * matching given key.
787             *
788             * This function is equivalent to
789             * @code
790             * std::make_pair(c.lower_bound(val),
791             * c.upper_bound(val))
792             * @endcode
793             * (but is faster than making the calls separately).
794             *
795             * This function probably only makes sense for multisets.
796             */
797             std::pair
798             equal_range(const key_type& __x)
799             { return _M_t.equal_range(__x); }
800              
801             std::pair
802             equal_range(const key_type& __x) const
803             { return _M_t.equal_range(__x); }
804              
805             #if __cplusplus > 201103L
806             template
807             auto
808             equal_range(const _Kt& __x)
809             -> decltype(_M_t._M_equal_range_tr(__x))
810             { return _M_t._M_equal_range_tr(__x); }
811              
812             template
813             auto
814             equal_range(const _Kt& __x) const
815             -> decltype(_M_t._M_equal_range_tr(__x))
816             { return _M_t._M_equal_range_tr(__x); }
817             #endif
818             //@}
819              
820             template
821             friend bool
822             operator==(const set<_K1, _C1, _A1>&, const set<_K1, _C1, _A1>&);
823              
824             template
825             friend bool
826             operator<(const set<_K1, _C1, _A1>&, const set<_K1, _C1, _A1>&);
827             };
828              
829              
830             /**
831             * @brief Set equality comparison.
832             * @param __x A %set.
833             * @param __y A %set of the same type as @a x.
834             * @return True iff the size and elements of the sets are equal.
835             *
836             * This is an equivalence relation. It is linear in the size of the sets.
837             * Sets are considered equivalent if their sizes are equal, and if
838             * corresponding elements compare equal.
839             */
840             template
841             inline bool
842             operator==(const set<_Key, _Compare, _Alloc>& __x,
843             const set<_Key, _Compare, _Alloc>& __y)
844             { return __x._M_t == __y._M_t; }
845              
846             /**
847             * @brief Set ordering relation.
848             * @param __x A %set.
849             * @param __y A %set of the same type as @a x.
850             * @return True iff @a __x is lexicographically less than @a __y.
851             *
852             * This is a total ordering relation. It is linear in the size of the
853             * sets. The elements must be comparable with @c <.
854             *
855             * See std::lexicographical_compare() for how the determination is made.
856             */
857             template
858             inline bool
859             operator<(const set<_Key, _Compare, _Alloc>& __x,
860             const set<_Key, _Compare, _Alloc>& __y)
861             { return __x._M_t < __y._M_t; }
862              
863             /// Returns !(x == y).
864             template
865             inline bool
866             operator!=(const set<_Key, _Compare, _Alloc>& __x,
867             const set<_Key, _Compare, _Alloc>& __y)
868             { return !(__x == __y); }
869              
870             /// Returns y < x.
871             template
872             inline bool
873             operator>(const set<_Key, _Compare, _Alloc>& __x,
874             const set<_Key, _Compare, _Alloc>& __y)
875             { return __y < __x; }
876              
877             /// Returns !(y < x)
878             template
879             inline bool
880             operator<=(const set<_Key, _Compare, _Alloc>& __x,
881             const set<_Key, _Compare, _Alloc>& __y)
882             { return !(__y < __x); }
883              
884             /// Returns !(x < y)
885             template
886             inline bool
887             operator>=(const set<_Key, _Compare, _Alloc>& __x,
888             const set<_Key, _Compare, _Alloc>& __y)
889             { return !(__x < __y); }
890              
891             /// See std::set::swap().
892             template
893             inline void
894             swap(set<_Key, _Compare, _Alloc>& __x, set<_Key, _Compare, _Alloc>& __y)
895             { __x.swap(__y); }
896              
897             _GLIBCXX_END_NAMESPACE_CONTAINER
898             } //namespace std
899             #endif /* _STL_SET_H */