1 // Set implementation -*- C++ -*-
2
3 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
4 // 2011 Free Software Foundation, Inc.
5 //
6 // This file is part of the GNU ISO C++ Library. This library is free
7 // software; you can redistribute it and/or modify it under the
8 // terms of the GNU General Public License as published by the
9 // Free Software Foundation; either version 3, or (at your option)
10 // any later version.
11
12 // This library is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
16
17 // Under Section 7 of GPL version 3, you are granted additional
18 // permissions described in the GCC Runtime Library Exception, version
19 // 3.1, as published by the Free Software Foundation.
20
21 // You should have received a copy of the GNU General Public License and
22 // a copy of the GCC Runtime Library Exception along with this program;
23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 // <http://www.gnu.org/licenses/>.
25
26 /*
27 *
28 * Copyright (c) 1994
29 * Hewlett-Packard Company
30 *
31 * Permission to use, copy, modify, distribute and sell this software
32 * and its documentation for any purpose is hereby granted without fee,
33 * provided that the above copyright notice appear in all copies and
34 * that both that copyright notice and this permission notice appear
35 * in supporting documentation. Hewlett-Packard Company makes no
36 * representations about the suitability of this software for any
37 * purpose. It is provided "as is" without express or implied warranty.
38 *
39 *
40 * Copyright (c) 1996,1997
41 * Silicon Graphics Computer Systems, Inc.
42 *
43 * Permission to use, copy, modify, distribute and sell this software
44 * and its documentation for any purpose is hereby granted without fee,
45 * provided that the above copyright notice appear in all copies and
46 * that both that copyright notice and this permission notice appear
47 * in supporting documentation. Silicon Graphics makes no
48 * representations about the suitability of this software for any
49 * purpose. It is provided "as is" without express or implied warranty.
50 */
51
52 /** @file bits/stl_set.h
53 * This is an internal header file, included by other library headers.
54 * Do not attempt to use it directly. @headername{set}
55 */
56
57 #ifndef _STL_SET_H
58 #define _STL_SET_H 1
59
60 #include <bits/concept_check.h>
61 #ifdef __GXX_EXPERIMENTAL_CXX0X__
62 #include <initializer_list>
63 #endif
64
_GLIBCXX_VISIBILITY(default)65 namespace std _GLIBCXX_VISIBILITY(default)
66 {
67 _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
68
69 /**
70 * @brief A standard container made up of unique keys, which can be
71 * retrieved in logarithmic time.
72 *
73 * @ingroup associative_containers
74 *
75 * Meets the requirements of a <a href="tables.html#65">container</a>, a
76 * <a href="tables.html#66">reversible container</a>, and an
77 * <a href="tables.html#69">associative container</a> (using unique keys).
78 *
79 * Sets support bidirectional iterators.
80 *
81 * @tparam _Key Type of key objects.
82 * @tparam _Compare Comparison function object type, defaults to less<Key>.
83 * @tparam _Alloc Allocator type, defaults to allocator<Key>.
84 *
85 * The private tree data is declared exactly the same way for set and
86 * multiset; the distinction is made entirely in how the tree functions are
87 * called (*_unique versus *_equal, same as the standard).
88 */
89 template<typename _Key, typename _Compare = std::less<_Key>,
90 typename _Alloc = std::allocator<_Key> >
91 class set
92 {
93 // concept requirements
94 typedef typename _Alloc::value_type _Alloc_value_type;
95 __glibcxx_class_requires(_Key, _SGIAssignableConcept)
96 __glibcxx_class_requires4(_Compare, bool, _Key, _Key,
97 _BinaryFunctionConcept)
98 __glibcxx_class_requires2(_Key, _Alloc_value_type, _SameTypeConcept)
99
100 public:
101 // typedefs:
102 //@{
103 /// Public typedefs.
104 typedef _Key key_type;
105 typedef _Key value_type;
106 typedef _Compare key_compare;
107 typedef _Compare value_compare;
108 typedef _Alloc allocator_type;
109 //@}
110
111 private:
112 typedef typename _Alloc::template rebind<_Key>::other _Key_alloc_type;
113
114 typedef _Rb_tree<key_type, value_type, _Identity<value_type>,
115 key_compare, _Key_alloc_type> _Rep_type;
116 _Rep_type _M_t; // Red-black tree representing set.
117
118 public:
119 //@{
120 /// Iterator-related typedefs.
121 typedef typename _Key_alloc_type::pointer pointer;
122 typedef typename _Key_alloc_type::const_pointer const_pointer;
123 typedef typename _Key_alloc_type::reference reference;
124 typedef typename _Key_alloc_type::const_reference const_reference;
125 // _GLIBCXX_RESOLVE_LIB_DEFECTS
126 // DR 103. set::iterator is required to be modifiable,
127 // but this allows modification of keys.
128 typedef typename _Rep_type::const_iterator iterator;
129 typedef typename _Rep_type::const_iterator const_iterator;
130 typedef typename _Rep_type::const_reverse_iterator reverse_iterator;
131 typedef typename _Rep_type::const_reverse_iterator const_reverse_iterator;
132 typedef typename _Rep_type::size_type size_type;
133 typedef typename _Rep_type::difference_type difference_type;
134 //@}
135
136 // allocation/deallocation
137 /**
138 * @brief Default constructor creates no elements.
139 */
140 set()
141 : _M_t() { }
142
143 /**
144 * @brief Creates a %set with no elements.
145 * @param __comp Comparator to use.
146 * @param __a An allocator object.
147 */
148 explicit
149 set(const _Compare& __comp,
150 const allocator_type& __a = allocator_type())
151 : _M_t(__comp, _Key_alloc_type(__a)) { }
152
153 /**
154 * @brief Builds a %set from a range.
155 * @param __first An input iterator.
156 * @param __last An input iterator.
157 *
158 * Create a %set consisting of copies of the elements from
159 * [__first,__last). This is linear in N if the range is
160 * already sorted, and NlogN otherwise (where N is
161 * distance(__first,__last)).
162 */
163 template<typename _InputIterator>
164 set(_InputIterator __first, _InputIterator __last)
165 : _M_t()
166 { _M_t._M_insert_unique(__first, __last); }
167
168 /**
169 * @brief Builds a %set from a range.
170 * @param __first An input iterator.
171 * @param __last An input iterator.
172 * @param __comp A comparison functor.
173 * @param __a An allocator object.
174 *
175 * Create a %set consisting of copies of the elements from
176 * [__first,__last). This is linear in N if the range is
177 * already sorted, and NlogN otherwise (where N is
178 * distance(__first,__last)).
179 */
180 template<typename _InputIterator>
181 set(_InputIterator __first, _InputIterator __last,
182 const _Compare& __comp,
183 const allocator_type& __a = allocator_type())
184 : _M_t(__comp, _Key_alloc_type(__a))
185 { _M_t._M_insert_unique(__first, __last); }
186
187 /**
188 * @brief %Set copy constructor.
189 * @param __x A %set of identical element and allocator types.
190 *
191 * The newly-created %set uses a copy of the allocation object used
192 * by @a __x.
193 */
194 set(const set& __x)
195 : _M_t(__x._M_t) { }
196
197 #ifdef __GXX_EXPERIMENTAL_CXX0X__
198 /**
199 * @brief %Set move constructor
200 * @param __x A %set of identical element and allocator types.
201 *
202 * The newly-created %set contains the exact contents of @a x.
203 * The contents of @a x are a valid, but unspecified %set.
204 */
205 set(set&& __x)
206 noexcept(is_nothrow_copy_constructible<_Compare>::value)
207 : _M_t(std::move(__x._M_t)) { }
208
209 /**
210 * @brief Builds a %set from an initializer_list.
211 * @param __l An initializer_list.
212 * @param __comp A comparison functor.
213 * @param __a An allocator object.
214 *
215 * Create a %set consisting of copies of the elements in the list.
216 * This is linear in N if the list is already sorted, and NlogN
217 * otherwise (where N is @a __l.size()).
218 */
219 set(initializer_list<value_type> __l,
220 const _Compare& __comp = _Compare(),
221 const allocator_type& __a = allocator_type())
222 : _M_t(__comp, _Key_alloc_type(__a))
223 { _M_t._M_insert_unique(__l.begin(), __l.end()); }
224 #endif
225
226 /**
227 * @brief %Set assignment operator.
228 * @param __x A %set of identical element and allocator types.
229 *
230 * All the elements of @a __x are copied, but unlike the copy
231 * constructor, the allocator object is not copied.
232 */
233 set&
234 operator=(const set& __x)
235 {
236 _M_t = __x._M_t;
237 return *this;
238 }
239
240 #ifdef __GXX_EXPERIMENTAL_CXX0X__
241 /**
242 * @brief %Set move assignment operator.
243 * @param __x A %set of identical element and allocator types.
244 *
245 * The contents of @a __x are moved into this %set (without copying).
246 * @a __x is a valid, but unspecified %set.
247 */
248 set&
249 operator=(set&& __x)
250 {
251 // NB: DR 1204.
252 // NB: DR 675.
253 this->clear();
254 this->swap(__x);
255 return *this;
256 }
257
258 /**
259 * @brief %Set list assignment operator.
260 * @param __l An initializer_list.
261 *
262 * This function fills a %set with copies of the elements in the
263 * initializer list @a __l.
264 *
265 * Note that the assignment completely changes the %set and
266 * that the resulting %set's size is the same as the number
267 * of elements assigned. Old data may be lost.
268 */
269 set&
270 operator=(initializer_list<value_type> __l)
271 {
272 this->clear();
273 this->insert(__l.begin(), __l.end());
274 return *this;
275 }
276 #endif
277
278 // accessors:
279
280 /// Returns the comparison object with which the %set was constructed.
281 key_compare
282 key_comp() const
283 { return _M_t.key_comp(); }
284 /// Returns the comparison object with which the %set was constructed.
285 value_compare
286 value_comp() const
287 { return _M_t.key_comp(); }
288 /// Returns the allocator object with which the %set was constructed.
289 allocator_type
290 get_allocator() const _GLIBCXX_NOEXCEPT
291 { return allocator_type(_M_t.get_allocator()); }
292
293 /**
294 * Returns a read-only (constant) iterator that points to the first
295 * element in the %set. Iteration is done in ascending order according
296 * to the keys.
297 */
298 iterator
299 begin() const _GLIBCXX_NOEXCEPT
300 { return _M_t.begin(); }
301
302 /**
303 * Returns a read-only (constant) iterator that points one past the last
304 * element in the %set. Iteration is done in ascending order according
305 * to the keys.
306 */
307 iterator
308 end() const _GLIBCXX_NOEXCEPT
309 { return _M_t.end(); }
310
311 /**
312 * Returns a read-only (constant) iterator that points to the last
313 * element in the %set. Iteration is done in descending order according
314 * to the keys.
315 */
316 reverse_iterator
317 rbegin() const _GLIBCXX_NOEXCEPT
318 { return _M_t.rbegin(); }
319
320 /**
321 * Returns a read-only (constant) reverse iterator that points to the
322 * last pair in the %set. Iteration is done in descending order
323 * according to the keys.
324 */
325 reverse_iterator
326 rend() const _GLIBCXX_NOEXCEPT
327 { return _M_t.rend(); }
328
329 #ifdef __GXX_EXPERIMENTAL_CXX0X__
330 /**
331 * Returns a read-only (constant) iterator that points to the first
332 * element in the %set. Iteration is done in ascending order according
333 * to the keys.
334 */
335 iterator
336 cbegin() const noexcept
337 { return _M_t.begin(); }
338
339 /**
340 * Returns a read-only (constant) iterator that points one past the last
341 * element in the %set. Iteration is done in ascending order according
342 * to the keys.
343 */
344 iterator
345 cend() const noexcept
346 { return _M_t.end(); }
347
348 /**
349 * Returns a read-only (constant) iterator that points to the last
350 * element in the %set. Iteration is done in descending order according
351 * to the keys.
352 */
353 reverse_iterator
354 crbegin() const noexcept
355 { return _M_t.rbegin(); }
356
357 /**
358 * Returns a read-only (constant) reverse iterator that points to the
359 * last pair in the %set. Iteration is done in descending order
360 * according to the keys.
361 */
362 reverse_iterator
363 crend() const noexcept
364 { return _M_t.rend(); }
365 #endif
366
367 /// Returns true if the %set is empty.
368 bool
369 empty() const _GLIBCXX_NOEXCEPT
370 { return _M_t.empty(); }
371
372 /// Returns the size of the %set.
373 size_type
374 size() const _GLIBCXX_NOEXCEPT
375 { return _M_t.size(); }
376
377 /// Returns the maximum size of the %set.
378 size_type
379 max_size() const _GLIBCXX_NOEXCEPT
380 { return _M_t.max_size(); }
381
382 /**
383 * @brief Swaps data with another %set.
384 * @param __x A %set of the same element and allocator types.
385 *
386 * This exchanges the elements between two sets in constant
387 * time. (It is only swapping a pointer, an integer, and an
388 * instance of the @c Compare type (which itself is often
389 * stateless and empty), so it should be quite fast.) Note
390 * that the global std::swap() function is specialized such
391 * that std::swap(s1,s2) will feed to this function.
392 */
393 void
394 swap(set& __x)
395 { _M_t.swap(__x._M_t); }
396
397 // insert/erase
398 /**
399 * @brief Attempts to insert an element into the %set.
400 * @param __x Element to be inserted.
401 * @return A pair, of which the first element is an iterator that points
402 * to the possibly inserted element, and the second is a bool
403 * that is true if the element was actually inserted.
404 *
405 * This function attempts to insert an element into the %set. A %set
406 * relies on unique keys and thus an element is only inserted if it is
407 * not already present in the %set.
408 *
409 * Insertion requires logarithmic time.
410 */
411 std::pair<iterator, bool>
412 insert(const value_type& __x)
413 {
414 std::pair<typename _Rep_type::iterator, bool> __p =
415 _M_t._M_insert_unique(__x);
416 return std::pair<iterator, bool>(__p.first, __p.second);
417 }
418
419 #ifdef __GXX_EXPERIMENTAL_CXX0X__
420 std::pair<iterator, bool>
421 insert(value_type&& __x)
422 {
423 std::pair<typename _Rep_type::iterator, bool> __p =
424 _M_t._M_insert_unique(std::move(__x));
425 return std::pair<iterator, bool>(__p.first, __p.second);
426 }
427 #endif
428
429 /**
430 * @brief Attempts to insert an element into the %set.
431 * @param __position An iterator that serves as a hint as to where the
432 * element should be inserted.
433 * @param __x Element to be inserted.
434 * @return An iterator that points to the element with key of
435 * @a __x (may or may not be the element passed in).
436 *
437 * This function is not concerned about whether the insertion took place,
438 * and thus does not return a boolean like the single-argument insert()
439 * does. Note that the first parameter is only a hint and can
440 * potentially improve the performance of the insertion process. A bad
441 * hint would cause no gains in efficiency.
442 *
443 * For more on @a hinting, see:
444 * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt07ch17.html
445 *
446 * Insertion requires logarithmic time (if the hint is not taken).
447 */
448 iterator
449 insert(const_iterator __position, const value_type& __x)
450 { return _M_t._M_insert_unique_(__position, __x); }
451
452 #ifdef __GXX_EXPERIMENTAL_CXX0X__
453 iterator
454 insert(const_iterator __position, value_type&& __x)
455 { return _M_t._M_insert_unique_(__position, std::move(__x)); }
456 #endif
457
458 /**
459 * @brief A template function that attempts to insert a range
460 * of elements.
461 * @param __first Iterator pointing to the start of the range to be
462 * inserted.
463 * @param __last Iterator pointing to the end of the range.
464 *
465 * Complexity similar to that of the range constructor.
466 */
467 template<typename _InputIterator>
468 void
469 insert(_InputIterator __first, _InputIterator __last)
470 { _M_t._M_insert_unique(__first, __last); }
471
472 #ifdef __GXX_EXPERIMENTAL_CXX0X__
473 /**
474 * @brief Attempts to insert a list of elements into the %set.
475 * @param __l A std::initializer_list<value_type> of elements
476 * to be inserted.
477 *
478 * Complexity similar to that of the range constructor.
479 */
480 void
481 insert(initializer_list<value_type> __l)
482 { this->insert(__l.begin(), __l.end()); }
483 #endif
484
485 #ifdef __GXX_EXPERIMENTAL_CXX0X__
486 // _GLIBCXX_RESOLVE_LIB_DEFECTS
487 // DR 130. Associative erase should return an iterator.
488 /**
489 * @brief Erases an element from a %set.
490 * @param __position An iterator pointing to the element to be erased.
491 * @return An iterator pointing to the element immediately following
492 * @a __position prior to the element being erased. If no such
493 * element exists, end() is returned.
494 *
495 * This function erases an element, pointed to by the given iterator,
496 * from a %set. Note that this function only erases the element, and
497 * that if the element is itself a pointer, the pointed-to memory is not
498 * touched in any way. Managing the pointer is the user's
499 * responsibility.
500 */
501 iterator
502 erase(const_iterator __position)
503 { return _M_t.erase(__position); }
504 #else
505 /**
506 * @brief Erases an element from a %set.
507 * @param position An iterator pointing to the element to be erased.
508 *
509 * This function erases an element, pointed to by the given iterator,
510 * from a %set. Note that this function only erases the element, and
511 * that if the element is itself a pointer, the pointed-to memory is not
512 * touched in any way. Managing the pointer is the user's
513 * responsibility.
514 */
515 void
516 erase(iterator __position)
517 { _M_t.erase(__position); }
518 #endif
519
520 /**
521 * @brief Erases elements according to the provided key.
522 * @param __x Key of element to be erased.
523 * @return The number of elements erased.
524 *
525 * This function erases all the elements located by the given key from
526 * a %set.
527 * Note that this function only erases the element, and that if
528 * the element is itself a pointer, the pointed-to memory is not touched
529 * in any way. Managing the pointer is the user's responsibility.
530 */
531 size_type
532 erase(const key_type& __x)
533 { return _M_t.erase(__x); }
534
535 #ifdef __GXX_EXPERIMENTAL_CXX0X__
536 // _GLIBCXX_RESOLVE_LIB_DEFECTS
537 // DR 130. Associative erase should return an iterator.
538 /**
539 * @brief Erases a [__first,__last) range of elements from a %set.
540 * @param __first Iterator pointing to the start of the range to be
541 * erased.
542
543 * @param __last Iterator pointing to the end of the range to
544 * be erased.
545 * @return The iterator @a __last.
546 *
547 * This function erases a sequence of elements from a %set.
548 * Note that this function only erases the element, and that if
549 * the element is itself a pointer, the pointed-to memory is not touched
550 * in any way. Managing the pointer is the user's responsibility.
551 */
552 iterator
553 erase(const_iterator __first, const_iterator __last)
554 { return _M_t.erase(__first, __last); }
555 #else
556 /**
557 * @brief Erases a [first,last) range of elements from a %set.
558 * @param __first Iterator pointing to the start of the range to be
559 * erased.
560 * @param __last Iterator pointing to the end of the range to
561 * be erased.
562 *
563 * This function erases a sequence of elements from a %set.
564 * Note that this function only erases the element, and that if
565 * the element is itself a pointer, the pointed-to memory is not touched
566 * in any way. Managing the pointer is the user's responsibility.
567 */
568 void
569 erase(iterator __first, iterator __last)
570 { _M_t.erase(__first, __last); }
571 #endif
572
573 /**
574 * Erases all elements in a %set. Note that this function only erases
575 * the elements, and that if the elements themselves are pointers, the
576 * pointed-to memory is not touched in any way. Managing the pointer is
577 * the user's responsibility.
578 */
579 void
580 clear() _GLIBCXX_NOEXCEPT
581 { _M_t.clear(); }
582
583 // set operations:
584
585 /**
586 * @brief Finds the number of elements.
587 * @param __x Element to located.
588 * @return Number of elements with specified key.
589 *
590 * This function only makes sense for multisets; for set the result will
591 * either be 0 (not present) or 1 (present).
592 */
593 size_type
594 count(const key_type& __x) const
595 { return _M_t.find(__x) == _M_t.end() ? 0 : 1; }
596
597 // _GLIBCXX_RESOLVE_LIB_DEFECTS
598 // 214. set::find() missing const overload
599 //@{
600 /**
601 * @brief Tries to locate an element in a %set.
602 * @param __x Element to be located.
603 * @return Iterator pointing to sought-after element, or end() if not
604 * found.
605 *
606 * This function takes a key and tries to locate the element with which
607 * the key matches. If successful the function returns an iterator
608 * pointing to the sought after element. If unsuccessful it returns the
609 * past-the-end ( @c end() ) iterator.
610 */
611 iterator
612 find(const key_type& __x)
613 { return _M_t.find(__x); }
614
615 const_iterator
616 find(const key_type& __x) const
617 { return _M_t.find(__x); }
618 //@}
619
620 //@{
621 /**
622 * @brief Finds the beginning of a subsequence matching given key.
623 * @param __x Key to be located.
624 * @return Iterator pointing to first element equal to or greater
625 * than key, or end().
626 *
627 * This function returns the first element of a subsequence of elements
628 * that matches the given key. If unsuccessful it returns an iterator
629 * pointing to the first element that has a greater value than given key
630 * or end() if no such element exists.
631 */
632 iterator
633 lower_bound(const key_type& __x)
634 { return _M_t.lower_bound(__x); }
635
636 const_iterator
637 lower_bound(const key_type& __x) const
638 { return _M_t.lower_bound(__x); }
639 //@}
640
641 //@{
642 /**
643 * @brief Finds the end of a subsequence matching given key.
644 * @param __x Key to be located.
645 * @return Iterator pointing to the first element
646 * greater than key, or end().
647 */
648 iterator
649 upper_bound(const key_type& __x)
650 { return _M_t.upper_bound(__x); }
651
652 const_iterator
653 upper_bound(const key_type& __x) const
654 { return _M_t.upper_bound(__x); }
655 //@}
656
657 //@{
658 /**
659 * @brief Finds a subsequence matching given key.
660 * @param __x Key to be located.
661 * @return Pair of iterators that possibly points to the subsequence
662 * matching given key.
663 *
664 * This function is equivalent to
665 * @code
666 * std::make_pair(c.lower_bound(val),
667 * c.upper_bound(val))
668 * @endcode
669 * (but is faster than making the calls separately).
670 *
671 * This function probably only makes sense for multisets.
672 */
673 std::pair<iterator, iterator>
674 equal_range(const key_type& __x)
675 { return _M_t.equal_range(__x); }
676
677 std::pair<const_iterator, const_iterator>
678 equal_range(const key_type& __x) const
679 { return _M_t.equal_range(__x); }
680 //@}
681
682 template<typename _K1, typename _C1, typename _A1>
683 friend bool
684 operator==(const set<_K1, _C1, _A1>&, const set<_K1, _C1, _A1>&);
685
686 template<typename _K1, typename _C1, typename _A1>
687 friend bool
688 operator<(const set<_K1, _C1, _A1>&, const set<_K1, _C1, _A1>&);
689 };
690
691
692 /**
693 * @brief Set equality comparison.
694 * @param __x A %set.
695 * @param __y A %set of the same type as @a x.
696 * @return True iff the size and elements of the sets are equal.
697 *
698 * This is an equivalence relation. It is linear in the size of the sets.
699 * Sets are considered equivalent if their sizes are equal, and if
700 * corresponding elements compare equal.
701 */
702 template<typename _Key, typename _Compare, typename _Alloc>
703 inline bool
704 operator==(const set<_Key, _Compare, _Alloc>& __x,
705 const set<_Key, _Compare, _Alloc>& __y)
706 { return __x._M_t == __y._M_t; }
707
708 /**
709 * @brief Set ordering relation.
710 * @param __x A %set.
711 * @param __y A %set of the same type as @a x.
712 * @return True iff @a __x is lexicographically less than @a __y.
713 *
714 * This is a total ordering relation. It is linear in the size of the
715 * maps. The elements must be comparable with @c <.
716 *
717 * See std::lexicographical_compare() for how the determination is made.
718 */
719 template<typename _Key, typename _Compare, typename _Alloc>
720 inline bool
721 operator<(const set<_Key, _Compare, _Alloc>& __x,
722 const set<_Key, _Compare, _Alloc>& __y)
723 { return __x._M_t < __y._M_t; }
724
725 /// Returns !(x == y).
726 template<typename _Key, typename _Compare, typename _Alloc>
727 inline bool
728 operator!=(const set<_Key, _Compare, _Alloc>& __x,
729 const set<_Key, _Compare, _Alloc>& __y)
730 { return !(__x == __y); }
731
732 /// Returns y < x.
733 template<typename _Key, typename _Compare, typename _Alloc>
734 inline bool
735 operator>(const set<_Key, _Compare, _Alloc>& __x,
736 const set<_Key, _Compare, _Alloc>& __y)
737 { return __y < __x; }
738
739 /// Returns !(y < x)
740 template<typename _Key, typename _Compare, typename _Alloc>
741 inline bool
742 operator<=(const set<_Key, _Compare, _Alloc>& __x,
743 const set<_Key, _Compare, _Alloc>& __y)
744 { return !(__y < __x); }
745
746 /// Returns !(x < y)
747 template<typename _Key, typename _Compare, typename _Alloc>
748 inline bool
749 operator>=(const set<_Key, _Compare, _Alloc>& __x,
750 const set<_Key, _Compare, _Alloc>& __y)
751 { return !(__x < __y); }
752
753 /// See std::set::swap().
754 template<typename _Key, typename _Compare, typename _Alloc>
755 inline void
756 swap(set<_Key, _Compare, _Alloc>& __x, set<_Key, _Compare, _Alloc>& __y)
757 { __x.swap(__y); }
758
759 _GLIBCXX_END_NAMESPACE_CONTAINER
760 } //namespace std
761 #endif /* _STL_SET_H */
762