Line data Source code
1 : // Map implementation -*- C++ -*-
2 :
3 : // Copyright (C) 2001-2016 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_map.h
52 : * This is an internal header file, included by other library headers.
53 : * Do not attempt to use it directly. @headername{map}
54 : */
55 :
56 : #ifndef _STL_MAP_H
57 : #define _STL_MAP_H 1
58 :
59 : #include <bits/functexcept.h>
60 : #include <bits/concept_check.h>
61 : #if __cplusplus >= 201103L
62 : #include <initializer_list>
63 : #include <tuple>
64 : #endif
65 :
66 : namespace std _GLIBCXX_VISIBILITY(default)
67 : {
68 : _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
69 :
70 : /**
71 : * @brief A standard container made up of (key,value) pairs, which can be
72 : * retrieved based on a key, in logarithmic time.
73 : *
74 : * @ingroup associative_containers
75 : *
76 : * @tparam _Key Type of key objects.
77 : * @tparam _Tp Type of mapped objects.
78 : * @tparam _Compare Comparison function object type, defaults to less<_Key>.
79 : * @tparam _Alloc Allocator type, defaults to
80 : * allocator<pair<const _Key, _Tp>.
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 : * For a @c map<Key,T> the key_type is Key, the mapped_type is T, and the
86 : * value_type is std::pair<const Key,T>.
87 : *
88 : * Maps support bidirectional iterators.
89 : *
90 : * The private tree data is declared exactly the same way for map and
91 : * multimap; the distinction is made entirely in how the tree functions are
92 : * called (*_unique versus *_equal, same as the standard).
93 : */
94 : template <typename _Key, typename _Tp, typename _Compare = std::less<_Key>,
95 : typename _Alloc = std::allocator<std::pair<const _Key, _Tp> > >
96 0 : class map
97 : {
98 : public:
99 : typedef _Key key_type;
100 : typedef _Tp mapped_type;
101 : typedef std::pair<const _Key, _Tp> value_type;
102 : typedef _Compare key_compare;
103 : typedef _Alloc allocator_type;
104 :
105 : private:
106 : // concept requirements
107 : typedef typename _Alloc::value_type _Alloc_value_type;
108 : __glibcxx_class_requires(_Tp, _SGIAssignableConcept)
109 : __glibcxx_class_requires4(_Compare, bool, _Key, _Key,
110 : _BinaryFunctionConcept)
111 : __glibcxx_class_requires2(value_type, _Alloc_value_type, _SameTypeConcept)
112 :
113 : public:
114 : class value_compare
115 : : public std::binary_function<value_type, value_type, bool>
116 : {
117 : friend class map<_Key, _Tp, _Compare, _Alloc>;
118 : protected:
119 : _Compare comp;
120 :
121 : value_compare(_Compare __c)
122 : : comp(__c) { }
123 :
124 : public:
125 : bool operator()(const value_type& __x, const value_type& __y) const
126 : { return comp(__x.first, __y.first); }
127 : };
128 :
129 : private:
130 : /// This turns a red-black tree into a [multi]map.
131 : typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
132 : rebind<value_type>::other _Pair_alloc_type;
133 :
134 : typedef _Rb_tree<key_type, value_type, _Select1st<value_type>,
135 : key_compare, _Pair_alloc_type> _Rep_type;
136 :
137 : /// The actual tree structure.
138 : _Rep_type _M_t;
139 :
140 : typedef __gnu_cxx::__alloc_traits<_Pair_alloc_type> _Alloc_traits;
141 :
142 : public:
143 : // many of these are specified differently in ISO, but the following are
144 : // "functionally equivalent"
145 : typedef typename _Alloc_traits::pointer pointer;
146 : typedef typename _Alloc_traits::const_pointer const_pointer;
147 : typedef typename _Alloc_traits::reference reference;
148 : typedef typename _Alloc_traits::const_reference const_reference;
149 : typedef typename _Rep_type::iterator iterator;
150 : typedef typename _Rep_type::const_iterator const_iterator;
151 : typedef typename _Rep_type::size_type size_type;
152 : typedef typename _Rep_type::difference_type difference_type;
153 : typedef typename _Rep_type::reverse_iterator reverse_iterator;
154 : typedef typename _Rep_type::const_reverse_iterator const_reverse_iterator;
155 :
156 : // [23.3.1.1] construct/copy/destroy
157 : // (get_allocator() is also listed in this section)
158 :
159 : /**
160 : * @brief Default constructor creates no elements.
161 : */
162 0 : map()
163 : _GLIBCXX_NOEXCEPT_IF(
164 : is_nothrow_default_constructible<allocator_type>::value
165 : && is_nothrow_default_constructible<key_compare>::value)
166 0 : : _M_t() { }
167 :
168 : /**
169 : * @brief Creates a %map with no elements.
170 : * @param __comp A comparison object.
171 : * @param __a An allocator object.
172 : */
173 : explicit
174 : map(const _Compare& __comp,
175 : const allocator_type& __a = allocator_type())
176 : : _M_t(__comp, _Pair_alloc_type(__a)) { }
177 :
178 : /**
179 : * @brief %Map copy constructor.
180 : * @param __x A %map of identical element and allocator types.
181 : *
182 : * The newly-created %map uses a copy of the allocation object
183 : * used by @a __x.
184 : */
185 : map(const map& __x)
186 : : _M_t(__x._M_t) { }
187 :
188 : #if __cplusplus >= 201103L
189 : /**
190 : * @brief %Map move constructor.
191 : * @param __x A %map of identical element and allocator types.
192 : *
193 : * The newly-created %map contains the exact contents of @a __x.
194 : * The contents of @a __x are a valid, but unspecified %map.
195 : */
196 : map(map&& __x)
197 : noexcept(is_nothrow_copy_constructible<_Compare>::value)
198 : : _M_t(std::move(__x._M_t)) { }
199 :
200 : /**
201 : * @brief Builds a %map from an initializer_list.
202 : * @param __l An initializer_list.
203 : * @param __comp A comparison object.
204 : * @param __a An allocator object.
205 : *
206 : * Create a %map consisting of copies of the elements in the
207 : * initializer_list @a __l.
208 : * This is linear in N if the range is already sorted, and NlogN
209 : * otherwise (where N is @a __l.size()).
210 : */
211 : map(initializer_list<value_type> __l,
212 : const _Compare& __comp = _Compare(),
213 : const allocator_type& __a = allocator_type())
214 : : _M_t(__comp, _Pair_alloc_type(__a))
215 : { _M_t._M_insert_unique(__l.begin(), __l.end()); }
216 :
217 : /// Allocator-extended default constructor.
218 : explicit
219 : map(const allocator_type& __a)
220 : : _M_t(_Compare(), _Pair_alloc_type(__a)) { }
221 :
222 : /// Allocator-extended copy constructor.
223 : map(const map& __m, const allocator_type& __a)
224 : : _M_t(__m._M_t, _Pair_alloc_type(__a)) { }
225 :
226 : /// Allocator-extended move constructor.
227 : map(map&& __m, const allocator_type& __a)
228 : noexcept(is_nothrow_copy_constructible<_Compare>::value
229 : && _Alloc_traits::_S_always_equal())
230 : : _M_t(std::move(__m._M_t), _Pair_alloc_type(__a)) { }
231 :
232 : /// Allocator-extended initialier-list constructor.
233 : map(initializer_list<value_type> __l, const allocator_type& __a)
234 : : _M_t(_Compare(), _Pair_alloc_type(__a))
235 : { _M_t._M_insert_unique(__l.begin(), __l.end()); }
236 :
237 : /// Allocator-extended range constructor.
238 : template<typename _InputIterator>
239 : map(_InputIterator __first, _InputIterator __last,
240 : const allocator_type& __a)
241 : : _M_t(_Compare(), _Pair_alloc_type(__a))
242 : { _M_t._M_insert_unique(__first, __last); }
243 : #endif
244 :
245 : /**
246 : * @brief Builds a %map from a range.
247 : * @param __first An input iterator.
248 : * @param __last An input iterator.
249 : *
250 : * Create a %map consisting of copies of the elements from
251 : * [__first,__last). This is linear in N if the range is
252 : * already sorted, and NlogN otherwise (where N is
253 : * distance(__first,__last)).
254 : */
255 : template<typename _InputIterator>
256 : map(_InputIterator __first, _InputIterator __last)
257 : : _M_t()
258 : { _M_t._M_insert_unique(__first, __last); }
259 :
260 : /**
261 : * @brief Builds a %map from a range.
262 : * @param __first An input iterator.
263 : * @param __last An input iterator.
264 : * @param __comp A comparison functor.
265 : * @param __a An allocator object.
266 : *
267 : * Create a %map consisting of copies of the elements from
268 : * [__first,__last). This is linear in N if the range is
269 : * already sorted, and NlogN otherwise (where N is
270 : * distance(__first,__last)).
271 : */
272 : template<typename _InputIterator>
273 : map(_InputIterator __first, _InputIterator __last,
274 : const _Compare& __comp,
275 : const allocator_type& __a = allocator_type())
276 : : _M_t(__comp, _Pair_alloc_type(__a))
277 : { _M_t._M_insert_unique(__first, __last); }
278 :
279 : // FIXME There is no dtor declared, but we should have something
280 : // generated by Doxygen. I don't know what tags to add to this
281 : // paragraph to make that happen:
282 : /**
283 : * The dtor only erases the elements, and note that if the elements
284 : * themselves are pointers, the pointed-to memory is not touched in any
285 : * way. Managing the pointer is the user's responsibility.
286 : */
287 :
288 : /**
289 : * @brief %Map assignment operator.
290 : * @param __x A %map of identical element and allocator types.
291 : *
292 : * All the elements of @a __x are copied, but unlike the copy
293 : * constructor, the allocator object is not copied.
294 : */
295 : map&
296 : operator=(const map& __x)
297 : {
298 : _M_t = __x._M_t;
299 : return *this;
300 : }
301 :
302 : #if __cplusplus >= 201103L
303 : /// Move assignment operator.
304 : map&
305 : operator=(map&&) = default;
306 :
307 : /**
308 : * @brief %Map list assignment operator.
309 : * @param __l An initializer_list.
310 : *
311 : * This function fills a %map with copies of the elements in the
312 : * initializer list @a __l.
313 : *
314 : * Note that the assignment completely changes the %map and
315 : * that the resulting %map's size is the same as the number
316 : * of elements assigned. Old data may be lost.
317 : */
318 : map&
319 : operator=(initializer_list<value_type> __l)
320 : {
321 : _M_t._M_assign_unique(__l.begin(), __l.end());
322 : return *this;
323 : }
324 : #endif
325 :
326 : /// Get a copy of the memory allocation object.
327 : allocator_type
328 : get_allocator() const _GLIBCXX_NOEXCEPT
329 : { return allocator_type(_M_t.get_allocator()); }
330 :
331 : // iterators
332 : /**
333 : * Returns a read/write iterator that points to the first pair in the
334 : * %map.
335 : * Iteration is done in ascending order according to the keys.
336 : */
337 : iterator
338 : begin() _GLIBCXX_NOEXCEPT
339 : { return _M_t.begin(); }
340 :
341 : /**
342 : * Returns a read-only (constant) iterator that points to the first pair
343 : * in the %map. Iteration is done in ascending order according to the
344 : * keys.
345 : */
346 : const_iterator
347 : begin() const _GLIBCXX_NOEXCEPT
348 : { return _M_t.begin(); }
349 :
350 : /**
351 : * Returns a read/write iterator that points one past the last
352 : * pair in the %map. Iteration is done in ascending order
353 : * according to the keys.
354 : */
355 : iterator
356 0 : end() _GLIBCXX_NOEXCEPT
357 0 : { return _M_t.end(); }
358 :
359 : /**
360 : * Returns a read-only (constant) iterator that points one past the last
361 : * pair in the %map. Iteration is done in ascending order according to
362 : * the keys.
363 : */
364 : const_iterator
365 0 : end() const _GLIBCXX_NOEXCEPT
366 0 : { return _M_t.end(); }
367 :
368 : /**
369 : * Returns a read/write reverse iterator that points to the last pair in
370 : * the %map. Iteration is done in descending order according to the
371 : * keys.
372 : */
373 : reverse_iterator
374 : rbegin() _GLIBCXX_NOEXCEPT
375 : { return _M_t.rbegin(); }
376 :
377 : /**
378 : * Returns a read-only (constant) reverse iterator that points to the
379 : * last pair in the %map. Iteration is done in descending order
380 : * according to the keys.
381 : */
382 : const_reverse_iterator
383 : rbegin() const _GLIBCXX_NOEXCEPT
384 : { return _M_t.rbegin(); }
385 :
386 : /**
387 : * Returns a read/write reverse iterator that points to one before the
388 : * first pair in the %map. Iteration is done in descending order
389 : * according to the keys.
390 : */
391 : reverse_iterator
392 : rend() _GLIBCXX_NOEXCEPT
393 : { return _M_t.rend(); }
394 :
395 : /**
396 : * Returns a read-only (constant) reverse iterator that points to one
397 : * before the first pair in the %map. Iteration is done in descending
398 : * order according to the keys.
399 : */
400 : const_reverse_iterator
401 : rend() const _GLIBCXX_NOEXCEPT
402 : { return _M_t.rend(); }
403 :
404 : #if __cplusplus >= 201103L
405 : /**
406 : * Returns a read-only (constant) iterator that points to the first pair
407 : * in the %map. Iteration is done in ascending order according to the
408 : * keys.
409 : */
410 : const_iterator
411 : cbegin() const noexcept
412 : { return _M_t.begin(); }
413 :
414 : /**
415 : * Returns a read-only (constant) iterator that points one past the last
416 : * pair in the %map. Iteration is done in ascending order according to
417 : * the keys.
418 : */
419 : const_iterator
420 : cend() const noexcept
421 : { return _M_t.end(); }
422 :
423 : /**
424 : * Returns a read-only (constant) reverse iterator that points to the
425 : * last pair in the %map. Iteration is done in descending order
426 : * according to the keys.
427 : */
428 : const_reverse_iterator
429 : crbegin() const noexcept
430 : { return _M_t.rbegin(); }
431 :
432 : /**
433 : * Returns a read-only (constant) reverse iterator that points to one
434 : * before the first pair in the %map. Iteration is done in descending
435 : * order according to the keys.
436 : */
437 : const_reverse_iterator
438 : crend() const noexcept
439 : { return _M_t.rend(); }
440 : #endif
441 :
442 : // capacity
443 : /** Returns true if the %map is empty. (Thus begin() would equal
444 : * end().)
445 : */
446 : bool
447 : empty() const _GLIBCXX_NOEXCEPT
448 : { return _M_t.empty(); }
449 :
450 : /** Returns the size of the %map. */
451 : size_type
452 : size() const _GLIBCXX_NOEXCEPT
453 : { return _M_t.size(); }
454 :
455 : /** Returns the maximum size of the %map. */
456 : size_type
457 : max_size() const _GLIBCXX_NOEXCEPT
458 : { return _M_t.max_size(); }
459 :
460 : // [23.3.1.2] element access
461 : /**
462 : * @brief Subscript ( @c [] ) access to %map data.
463 : * @param __k The key for which data should be retrieved.
464 : * @return A reference to the data of the (key,data) %pair.
465 : *
466 : * Allows for easy lookup with the subscript ( @c [] )
467 : * operator. Returns data associated with the key specified in
468 : * subscript. If the key does not exist, a pair with that key
469 : * is created using default values, which is then returned.
470 : *
471 : * Lookup requires logarithmic time.
472 : */
473 : mapped_type&
474 : operator[](const key_type& __k)
475 : {
476 : // concept requirements
477 : __glibcxx_function_requires(_DefaultConstructibleConcept<mapped_type>)
478 :
479 : iterator __i = lower_bound(__k);
480 : // __i->first is greater than or equivalent to __k.
481 : if (__i == end() || key_comp()(__k, (*__i).first))
482 : #if __cplusplus >= 201103L
483 : __i = _M_t._M_emplace_hint_unique(__i, std::piecewise_construct,
484 : std::tuple<const key_type&>(__k),
485 : std::tuple<>());
486 : #else
487 : __i = insert(__i, value_type(__k, mapped_type()));
488 : #endif
489 : return (*__i).second;
490 : }
491 :
492 : #if __cplusplus >= 201103L
493 : mapped_type&
494 0 : operator[](key_type&& __k)
495 : {
496 : // concept requirements
497 : __glibcxx_function_requires(_DefaultConstructibleConcept<mapped_type>)
498 :
499 0 : iterator __i = lower_bound(__k);
500 : // __i->first is greater than or equivalent to __k.
501 0 : if (__i == end() || key_comp()(__k, (*__i).first))
502 0 : __i = _M_t._M_emplace_hint_unique(__i, std::piecewise_construct,
503 0 : std::forward_as_tuple(std::move(__k)),
504 : std::tuple<>());
505 0 : return (*__i).second;
506 : }
507 : #endif
508 :
509 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
510 : // DR 464. Suggestion for new member functions in standard containers.
511 : /**
512 : * @brief Access to %map data.
513 : * @param __k The key for which data should be retrieved.
514 : * @return A reference to the data whose key is equivalent to @a __k, if
515 : * such a data is present in the %map.
516 : * @throw std::out_of_range If no such data is present.
517 : */
518 : mapped_type&
519 : at(const key_type& __k)
520 : {
521 : iterator __i = lower_bound(__k);
522 : if (__i == end() || key_comp()(__k, (*__i).first))
523 : __throw_out_of_range(__N("map::at"));
524 : return (*__i).second;
525 : }
526 :
527 : const mapped_type&
528 : at(const key_type& __k) const
529 : {
530 : const_iterator __i = lower_bound(__k);
531 : if (__i == end() || key_comp()(__k, (*__i).first))
532 : __throw_out_of_range(__N("map::at"));
533 : return (*__i).second;
534 : }
535 :
536 : // modifiers
537 : #if __cplusplus >= 201103L
538 : /**
539 : * @brief Attempts to build and insert a std::pair into the %map.
540 : *
541 : * @param __args Arguments used to generate a new pair instance (see
542 : * std::piecewise_contruct for passing arguments to each
543 : * part of the pair constructor).
544 : *
545 : * @return A pair, of which the first element is an iterator that points
546 : * to the possibly inserted pair, and the second is a bool that
547 : * is true if the pair was actually inserted.
548 : *
549 : * This function attempts to build and insert a (key, value) %pair into
550 : * the %map.
551 : * A %map relies on unique keys and thus a %pair is only inserted if its
552 : * first element (the key) is not already present in the %map.
553 : *
554 : * Insertion requires logarithmic time.
555 : */
556 : template<typename... _Args>
557 : std::pair<iterator, bool>
558 : emplace(_Args&&... __args)
559 : { return _M_t._M_emplace_unique(std::forward<_Args>(__args)...); }
560 :
561 : /**
562 : * @brief Attempts to build and insert a std::pair into the %map.
563 : *
564 : * @param __pos An iterator that serves as a hint as to where the pair
565 : * should be inserted.
566 : * @param __args Arguments used to generate a new pair instance (see
567 : * std::piecewise_contruct for passing arguments to each
568 : * part of the pair constructor).
569 : * @return An iterator that points to the element with key of the
570 : * std::pair built from @a __args (may or may not be that
571 : * std::pair).
572 : *
573 : * This function is not concerned about whether the insertion took place,
574 : * and thus does not return a boolean like the single-argument emplace()
575 : * does.
576 : * Note that the first parameter is only a hint and can potentially
577 : * improve the performance of the insertion process. A bad hint would
578 : * cause no gains in efficiency.
579 : *
580 : * See
581 : * https://gcc.gnu.org/onlinedocs/libstdc++/manual/associative.html#containers.associative.insert_hints
582 : * for more on @a hinting.
583 : *
584 : * Insertion requires logarithmic time (if the hint is not taken).
585 : */
586 : template<typename... _Args>
587 : iterator
588 : emplace_hint(const_iterator __pos, _Args&&... __args)
589 : {
590 : return _M_t._M_emplace_hint_unique(__pos,
591 : std::forward<_Args>(__args)...);
592 : }
593 : #endif
594 :
595 : #if __cplusplus > 201402L
596 : #define __cpp_lib_map_try_emplace 201411
597 : /**
598 : * @brief Attempts to build and insert a std::pair into the %map.
599 : *
600 : * @param __k Key to use for finding a possibly existing pair in
601 : * the map.
602 : * @param __args Arguments used to generate the .second for a new pair
603 : * instance.
604 : *
605 : * @return A pair, of which the first element is an iterator that points
606 : * to the possibly inserted pair, and the second is a bool that
607 : * is true if the pair was actually inserted.
608 : *
609 : * This function attempts to build and insert a (key, value) %pair into
610 : * the %map.
611 : * A %map relies on unique keys and thus a %pair is only inserted if its
612 : * first element (the key) is not already present in the %map.
613 : * If a %pair is not inserted, this function has no effect.
614 : *
615 : * Insertion requires logarithmic time.
616 : */
617 : template <typename... _Args>
618 : pair<iterator, bool>
619 : try_emplace(const key_type& __k, _Args&&... __args)
620 : {
621 : iterator __i = lower_bound(__k);
622 : if (__i == end() || key_comp()(__k, (*__i).first))
623 : {
624 : __i = emplace_hint(__i, std::piecewise_construct,
625 : std::forward_as_tuple(__k),
626 : std::forward_as_tuple(
627 : std::forward<_Args>(__args)...));
628 : return {__i, true};
629 : }
630 : return {__i, false};
631 : }
632 :
633 : // move-capable overload
634 : template <typename... _Args>
635 : pair<iterator, bool>
636 : try_emplace(key_type&& __k, _Args&&... __args)
637 : {
638 : iterator __i = lower_bound(__k);
639 : if (__i == end() || key_comp()(__k, (*__i).first))
640 : {
641 : __i = emplace_hint(__i, std::piecewise_construct,
642 : std::forward_as_tuple(std::move(__k)),
643 : std::forward_as_tuple(
644 : std::forward<_Args>(__args)...));
645 : return {__i, true};
646 : }
647 : return {__i, false};
648 : }
649 :
650 : /**
651 : * @brief Attempts to build and insert a std::pair into the %map.
652 : *
653 : * @param __hint An iterator that serves as a hint as to where the
654 : * pair should be inserted.
655 : * @param __k Key to use for finding a possibly existing pair in
656 : * the map.
657 : * @param __args Arguments used to generate the .second for a new pair
658 : * instance.
659 : * @return An iterator that points to the element with key of the
660 : * std::pair built from @a __args (may or may not be that
661 : * std::pair).
662 : *
663 : * This function is not concerned about whether the insertion took place,
664 : * and thus does not return a boolean like the single-argument
665 : * try_emplace() does. However, if insertion did not take place,
666 : * this function has no effect.
667 : * Note that the first parameter is only a hint and can potentially
668 : * improve the performance of the insertion process. A bad hint would
669 : * cause no gains in efficiency.
670 : *
671 : * See
672 : * https://gcc.gnu.org/onlinedocs/libstdc++/manual/associative.html#containers.associative.insert_hints
673 : * for more on @a hinting.
674 : *
675 : * Insertion requires logarithmic time (if the hint is not taken).
676 : */
677 : template <typename... _Args>
678 : iterator
679 : try_emplace(const_iterator __hint, const key_type& __k,
680 : _Args&&... __args)
681 : {
682 : iterator __i;
683 : auto __true_hint = _M_t._M_get_insert_hint_unique_pos(__hint, __k);
684 : if (__true_hint.second)
685 : __i = emplace_hint(iterator(__true_hint.second),
686 : std::piecewise_construct,
687 : std::forward_as_tuple(__k),
688 : std::forward_as_tuple(
689 : std::forward<_Args>(__args)...));
690 : else
691 : __i = iterator(__true_hint.first);
692 : return __i;
693 : }
694 :
695 : // move-capable overload
696 : template <typename... _Args>
697 : iterator
698 : try_emplace(const_iterator __hint, key_type&& __k, _Args&&... __args)
699 : {
700 : iterator __i;
701 : auto __true_hint = _M_t._M_get_insert_hint_unique_pos(__hint, __k);
702 : if (__true_hint.second)
703 : __i = emplace_hint(iterator(__true_hint.second),
704 : std::piecewise_construct,
705 : std::forward_as_tuple(std::move(__k)),
706 : std::forward_as_tuple(
707 : std::forward<_Args>(__args)...));
708 : else
709 : __i = iterator(__true_hint.first);
710 : return __i;
711 : }
712 : #endif
713 :
714 : /**
715 : * @brief Attempts to insert a std::pair into the %map.
716 :
717 : * @param __x Pair to be inserted (see std::make_pair for easy
718 : * creation of pairs).
719 : *
720 : * @return A pair, of which the first element is an iterator that
721 : * points to the possibly inserted pair, and the second is
722 : * a bool that is true if the pair was actually inserted.
723 : *
724 : * This function attempts to insert a (key, value) %pair into the %map.
725 : * A %map relies on unique keys and thus a %pair is only inserted if its
726 : * first element (the key) is not already present in the %map.
727 : *
728 : * Insertion requires logarithmic time.
729 : */
730 : std::pair<iterator, bool>
731 : insert(const value_type& __x)
732 : { return _M_t._M_insert_unique(__x); }
733 :
734 : #if __cplusplus >= 201103L
735 : template<typename _Pair, typename = typename
736 : std::enable_if<std::is_constructible<value_type,
737 : _Pair&&>::value>::type>
738 : std::pair<iterator, bool>
739 : insert(_Pair&& __x)
740 : { return _M_t._M_insert_unique(std::forward<_Pair>(__x)); }
741 : #endif
742 :
743 : #if __cplusplus >= 201103L
744 : /**
745 : * @brief Attempts to insert a list of std::pairs into the %map.
746 : * @param __list A std::initializer_list<value_type> of pairs to be
747 : * inserted.
748 : *
749 : * Complexity similar to that of the range constructor.
750 : */
751 : void
752 : insert(std::initializer_list<value_type> __list)
753 : { insert(__list.begin(), __list.end()); }
754 : #endif
755 :
756 : /**
757 : * @brief Attempts to insert a std::pair into the %map.
758 : * @param __position An iterator that serves as a hint as to where the
759 : * pair should be inserted.
760 : * @param __x Pair to be inserted (see std::make_pair for easy creation
761 : * of pairs).
762 : * @return An iterator that points to the element with key of
763 : * @a __x (may or may not be the %pair passed in).
764 : *
765 :
766 : * This function is not concerned about whether the insertion
767 : * took place, and thus does not return a boolean like the
768 : * single-argument insert() does. Note that the first
769 : * parameter is only a hint and can potentially improve the
770 : * performance of the insertion process. A bad hint would
771 : * cause no gains in efficiency.
772 : *
773 : * See
774 : * https://gcc.gnu.org/onlinedocs/libstdc++/manual/associative.html#containers.associative.insert_hints
775 : * for more on @a hinting.
776 : *
777 : * Insertion requires logarithmic time (if the hint is not taken).
778 : */
779 : iterator
780 : #if __cplusplus >= 201103L
781 : insert(const_iterator __position, const value_type& __x)
782 : #else
783 : insert(iterator __position, const value_type& __x)
784 : #endif
785 : { return _M_t._M_insert_unique_(__position, __x); }
786 :
787 : #if __cplusplus >= 201103L
788 : template<typename _Pair, typename = typename
789 : std::enable_if<std::is_constructible<value_type,
790 : _Pair&&>::value>::type>
791 : iterator
792 : insert(const_iterator __position, _Pair&& __x)
793 : { return _M_t._M_insert_unique_(__position,
794 : std::forward<_Pair>(__x)); }
795 : #endif
796 :
797 : /**
798 : * @brief Template function that attempts to insert a range of elements.
799 : * @param __first Iterator pointing to the start of the range to be
800 : * inserted.
801 : * @param __last Iterator pointing to the end of the range.
802 : *
803 : * Complexity similar to that of the range constructor.
804 : */
805 : template<typename _InputIterator>
806 : void
807 : insert(_InputIterator __first, _InputIterator __last)
808 : { _M_t._M_insert_unique(__first, __last); }
809 :
810 : #if __cplusplus > 201402L
811 : #define __cpp_lib_map_insertion 201411
812 : /**
813 : * @brief Attempts to insert or assign a std::pair into the %map.
814 : * @param __k Key to use for finding a possibly existing pair in
815 : * the map.
816 : * @param __obj Argument used to generate the .second for a pair
817 : * instance.
818 : *
819 : * @return A pair, of which the first element is an iterator that
820 : * points to the possibly inserted pair, and the second is
821 : * a bool that is true if the pair was actually inserted.
822 : *
823 : * This function attempts to insert a (key, value) %pair into the %map.
824 : * A %map relies on unique keys and thus a %pair is only inserted if its
825 : * first element (the key) is not already present in the %map.
826 : * If the %pair was already in the %map, the .second of the %pair
827 : * is assigned from __obj.
828 : *
829 : * Insertion requires logarithmic time.
830 : */
831 : template <typename _Obj>
832 : pair<iterator, bool>
833 : insert_or_assign(const key_type& __k, _Obj&& __obj)
834 : {
835 : iterator __i = lower_bound(__k);
836 : if (__i == end() || key_comp()(__k, (*__i).first))
837 : {
838 : __i = emplace_hint(__i, std::piecewise_construct,
839 : std::forward_as_tuple(__k),
840 : std::forward_as_tuple(
841 : std::forward<_Obj>(__obj)));
842 : return {__i, true};
843 : }
844 : (*__i).second = std::forward<_Obj>(__obj);
845 : return {__i, false};
846 : }
847 :
848 : // move-capable overload
849 : template <typename _Obj>
850 : pair<iterator, bool>
851 : insert_or_assign(key_type&& __k, _Obj&& __obj)
852 : {
853 : iterator __i = lower_bound(__k);
854 : if (__i == end() || key_comp()(__k, (*__i).first))
855 : {
856 : __i = emplace_hint(__i, std::piecewise_construct,
857 : std::forward_as_tuple(std::move(__k)),
858 : std::forward_as_tuple(
859 : std::forward<_Obj>(__obj)));
860 : return {__i, true};
861 : }
862 : (*__i).second = std::forward<_Obj>(__obj);
863 : return {__i, false};
864 : }
865 :
866 : /**
867 : * @brief Attempts to insert or assign a std::pair into the %map.
868 : * @param __hint An iterator that serves as a hint as to where the
869 : * pair should be inserted.
870 : * @param __k Key to use for finding a possibly existing pair in
871 : * the map.
872 : * @param __obj Argument used to generate the .second for a pair
873 : * instance.
874 : *
875 : * @return An iterator that points to the element with key of
876 : * @a __x (may or may not be the %pair passed in).
877 : *
878 : * This function attempts to insert a (key, value) %pair into the %map.
879 : * A %map relies on unique keys and thus a %pair is only inserted if its
880 : * first element (the key) is not already present in the %map.
881 : * If the %pair was already in the %map, the .second of the %pair
882 : * is assigned from __obj.
883 : *
884 : * Insertion requires logarithmic time.
885 : */
886 : template <typename _Obj>
887 : iterator
888 : insert_or_assign(const_iterator __hint,
889 : const key_type& __k, _Obj&& __obj)
890 : {
891 : iterator __i;
892 : auto __true_hint = _M_t._M_get_insert_hint_unique_pos(__hint, __k);
893 : if (__true_hint.second)
894 : {
895 : return emplace_hint(iterator(__true_hint.second),
896 : std::piecewise_construct,
897 : std::forward_as_tuple(__k),
898 : std::forward_as_tuple(
899 : std::forward<_Obj>(__obj)));
900 : }
901 : __i = iterator(__true_hint.first);
902 : (*__i).second = std::forward<_Obj>(__obj);
903 : return __i;
904 : }
905 :
906 : // move-capable overload
907 : template <typename _Obj>
908 : iterator
909 : insert_or_assign(const_iterator __hint, key_type&& __k, _Obj&& __obj)
910 : {
911 : iterator __i;
912 : auto __true_hint = _M_t._M_get_insert_hint_unique_pos(__hint, __k);
913 : if (__true_hint.second)
914 : {
915 : return emplace_hint(iterator(__true_hint.second),
916 : std::piecewise_construct,
917 : std::forward_as_tuple(std::move(__k)),
918 : std::forward_as_tuple(
919 : std::forward<_Obj>(__obj)));
920 : }
921 : __i = iterator(__true_hint.first);
922 : (*__i).second = std::forward<_Obj>(__obj);
923 : return __i;
924 : }
925 : #endif
926 :
927 : #if __cplusplus >= 201103L
928 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
929 : // DR 130. Associative erase should return an iterator.
930 : /**
931 : * @brief Erases an element from a %map.
932 : * @param __position An iterator pointing to the element to be erased.
933 : * @return An iterator pointing to the element immediately following
934 : * @a position prior to the element being erased. If no such
935 : * element exists, end() is returned.
936 : *
937 : * This function erases an element, pointed to by the given
938 : * iterator, from a %map. Note that this function only erases
939 : * the element, and that if the element is itself a pointer,
940 : * the pointed-to memory is not touched in any way. Managing
941 : * the pointer is the user's responsibility.
942 : */
943 : iterator
944 : erase(const_iterator __position)
945 : { return _M_t.erase(__position); }
946 :
947 : // LWG 2059
948 : _GLIBCXX_ABI_TAG_CXX11
949 : iterator
950 : erase(iterator __position)
951 : { return _M_t.erase(__position); }
952 : #else
953 : /**
954 : * @brief Erases an element from a %map.
955 : * @param __position An iterator pointing to the element to be erased.
956 : *
957 : * This function erases an element, pointed to by the given
958 : * iterator, from a %map. Note that this function only erases
959 : * the element, and that if the element is itself a pointer,
960 : * the pointed-to memory is not touched in any way. Managing
961 : * the pointer is the user's responsibility.
962 : */
963 : void
964 : erase(iterator __position)
965 : { _M_t.erase(__position); }
966 : #endif
967 :
968 : /**
969 : * @brief Erases elements according to the provided key.
970 : * @param __x Key of element to be erased.
971 : * @return The number of elements erased.
972 : *
973 : * This function erases all the elements located by the given key from
974 : * a %map.
975 : * Note that this function only erases the element, and that if
976 : * the element is itself a pointer, the pointed-to memory is not touched
977 : * in any way. Managing the pointer is the user's responsibility.
978 : */
979 : size_type
980 : erase(const key_type& __x)
981 : { return _M_t.erase(__x); }
982 :
983 : #if __cplusplus >= 201103L
984 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
985 : // DR 130. Associative erase should return an iterator.
986 : /**
987 : * @brief Erases a [first,last) range of elements from a %map.
988 : * @param __first Iterator pointing to the start of the range to be
989 : * erased.
990 : * @param __last Iterator pointing to the end of the range to
991 : * be erased.
992 : * @return The iterator @a __last.
993 : *
994 : * This function erases a sequence of elements from a %map.
995 : * Note that this function only erases the element, and that if
996 : * the element is itself a pointer, the pointed-to memory is not touched
997 : * in any way. Managing the pointer is the user's responsibility.
998 : */
999 : iterator
1000 : erase(const_iterator __first, const_iterator __last)
1001 : { return _M_t.erase(__first, __last); }
1002 : #else
1003 : /**
1004 : * @brief Erases a [__first,__last) range of elements from a %map.
1005 : * @param __first Iterator pointing to the start of the range to be
1006 : * erased.
1007 : * @param __last Iterator pointing to the end of the range to
1008 : * be erased.
1009 : *
1010 : * This function erases a sequence of elements from a %map.
1011 : * Note that this function only erases the element, and that if
1012 : * the element is itself a pointer, the pointed-to memory is not touched
1013 : * in any way. Managing the pointer is the user's responsibility.
1014 : */
1015 : void
1016 : erase(iterator __first, iterator __last)
1017 : { _M_t.erase(__first, __last); }
1018 : #endif
1019 :
1020 : /**
1021 : * @brief Swaps data with another %map.
1022 : * @param __x A %map of the same element and allocator types.
1023 : *
1024 : * This exchanges the elements between two maps in constant
1025 : * time. (It is only swapping a pointer, an integer, and an
1026 : * instance of the @c Compare type (which itself is often
1027 : * stateless and empty), so it should be quite fast.) Note
1028 : * that the global std::swap() function is specialized such
1029 : * that std::swap(m1,m2) will feed to this function.
1030 : */
1031 : void
1032 : swap(map& __x)
1033 : _GLIBCXX_NOEXCEPT_IF(__is_nothrow_swappable<_Compare>::value)
1034 : { _M_t.swap(__x._M_t); }
1035 :
1036 : /**
1037 : * Erases all elements in a %map. Note that this function only
1038 : * erases the elements, and that if the elements themselves are
1039 : * pointers, the pointed-to memory is not touched in any way.
1040 : * Managing the pointer is the user's responsibility.
1041 : */
1042 : void
1043 : clear() _GLIBCXX_NOEXCEPT
1044 : { _M_t.clear(); }
1045 :
1046 : // observers
1047 : /**
1048 : * Returns the key comparison object out of which the %map was
1049 : * constructed.
1050 : */
1051 : key_compare
1052 0 : key_comp() const
1053 0 : { return _M_t.key_comp(); }
1054 :
1055 : /**
1056 : * Returns a value comparison object, built from the key comparison
1057 : * object out of which the %map was constructed.
1058 : */
1059 : value_compare
1060 : value_comp() const
1061 : { return value_compare(_M_t.key_comp()); }
1062 :
1063 : // [23.3.1.3] map operations
1064 :
1065 : //@{
1066 : /**
1067 : * @brief Tries to locate an element in a %map.
1068 : * @param __x Key of (key, value) %pair to be located.
1069 : * @return Iterator pointing to sought-after element, or end() if not
1070 : * found.
1071 : *
1072 : * This function takes a key and tries to locate the element with which
1073 : * the key matches. If successful the function returns an iterator
1074 : * pointing to the sought after %pair. If unsuccessful it returns the
1075 : * past-the-end ( @c end() ) iterator.
1076 : */
1077 :
1078 : iterator
1079 : find(const key_type& __x)
1080 : { return _M_t.find(__x); }
1081 :
1082 : #if __cplusplus > 201103L
1083 : template<typename _Kt>
1084 : auto
1085 : find(const _Kt& __x) -> decltype(_M_t._M_find_tr(__x))
1086 : { return _M_t._M_find_tr(__x); }
1087 : #endif
1088 : //@}
1089 :
1090 : //@{
1091 : /**
1092 : * @brief Tries to locate an element in a %map.
1093 : * @param __x Key of (key, value) %pair to be located.
1094 : * @return Read-only (constant) iterator pointing to sought-after
1095 : * element, or end() if not found.
1096 : *
1097 : * This function takes a key and tries to locate the element with which
1098 : * the key matches. If successful the function returns a constant
1099 : * iterator pointing to the sought after %pair. If unsuccessful it
1100 : * returns the past-the-end ( @c end() ) iterator.
1101 : */
1102 :
1103 : const_iterator
1104 0 : find(const key_type& __x) const
1105 0 : { return _M_t.find(__x); }
1106 :
1107 : #if __cplusplus > 201103L
1108 : template<typename _Kt>
1109 : auto
1110 : find(const _Kt& __x) const -> decltype(_M_t._M_find_tr(__x))
1111 : { return _M_t._M_find_tr(__x); }
1112 : #endif
1113 : //@}
1114 :
1115 : //@{
1116 : /**
1117 : * @brief Finds the number of elements with given key.
1118 : * @param __x Key of (key, value) pairs to be located.
1119 : * @return Number of elements with specified key.
1120 : *
1121 : * This function only makes sense for multimaps; for map the result will
1122 : * either be 0 (not present) or 1 (present).
1123 : */
1124 : size_type
1125 : count(const key_type& __x) const
1126 : { return _M_t.find(__x) == _M_t.end() ? 0 : 1; }
1127 :
1128 : #if __cplusplus > 201103L
1129 : template<typename _Kt>
1130 : auto
1131 : count(const _Kt& __x) const -> decltype(_M_t._M_count_tr(__x))
1132 : { return _M_t._M_find_tr(__x) == _M_t.end() ? 0 : 1; }
1133 : #endif
1134 : //@}
1135 :
1136 : //@{
1137 : /**
1138 : * @brief Finds the beginning of a subsequence matching given key.
1139 : * @param __x Key of (key, value) pair to be located.
1140 : * @return Iterator pointing to first element equal to or greater
1141 : * than key, or end().
1142 : *
1143 : * This function returns the first element of a subsequence of elements
1144 : * that matches the given key. If unsuccessful it returns an iterator
1145 : * pointing to the first element that has a greater value than given key
1146 : * or end() if no such element exists.
1147 : */
1148 : iterator
1149 0 : lower_bound(const key_type& __x)
1150 0 : { return _M_t.lower_bound(__x); }
1151 :
1152 : #if __cplusplus > 201103L
1153 : template<typename _Kt>
1154 : auto
1155 : lower_bound(const _Kt& __x)
1156 : -> decltype(_M_t._M_lower_bound_tr(__x))
1157 : { return _M_t._M_lower_bound_tr(__x); }
1158 : #endif
1159 : //@}
1160 :
1161 : //@{
1162 : /**
1163 : * @brief Finds the beginning of a subsequence matching given key.
1164 : * @param __x Key of (key, value) pair to be located.
1165 : * @return Read-only (constant) iterator pointing to first element
1166 : * equal to or greater than key, or end().
1167 : *
1168 : * This function returns the first element of a subsequence of elements
1169 : * that matches the given key. If unsuccessful it returns an iterator
1170 : * pointing to the first element that has a greater value than given key
1171 : * or end() if no such element exists.
1172 : */
1173 : const_iterator
1174 : lower_bound(const key_type& __x) const
1175 : { return _M_t.lower_bound(__x); }
1176 :
1177 : #if __cplusplus > 201103L
1178 : template<typename _Kt>
1179 : auto
1180 : lower_bound(const _Kt& __x) const
1181 : -> decltype(_M_t._M_lower_bound_tr(__x))
1182 : { return _M_t._M_lower_bound_tr(__x); }
1183 : #endif
1184 : //@}
1185 :
1186 : //@{
1187 : /**
1188 : * @brief Finds the end of a subsequence matching given key.
1189 : * @param __x Key of (key, value) pair to be located.
1190 : * @return Iterator pointing to the first element
1191 : * greater than key, or end().
1192 : */
1193 : iterator
1194 : upper_bound(const key_type& __x)
1195 : { return _M_t.upper_bound(__x); }
1196 :
1197 : #if __cplusplus > 201103L
1198 : template<typename _Kt>
1199 : auto
1200 : upper_bound(const _Kt& __x)
1201 : -> decltype(_M_t._M_upper_bound_tr(__x))
1202 : { return _M_t._M_upper_bound_tr(__x); }
1203 : #endif
1204 : //@}
1205 :
1206 : //@{
1207 : /**
1208 : * @brief Finds the end of a subsequence matching given key.
1209 : * @param __x Key of (key, value) pair to be located.
1210 : * @return Read-only (constant) iterator pointing to first iterator
1211 : * greater than key, or end().
1212 : */
1213 : const_iterator
1214 : upper_bound(const key_type& __x) const
1215 : { return _M_t.upper_bound(__x); }
1216 :
1217 : #if __cplusplus > 201103L
1218 : template<typename _Kt>
1219 : auto
1220 : upper_bound(const _Kt& __x) const
1221 : -> decltype(_M_t._M_upper_bound_tr(__x))
1222 : { return _M_t._M_upper_bound_tr(__x); }
1223 : #endif
1224 : //@}
1225 :
1226 : //@{
1227 : /**
1228 : * @brief Finds a subsequence matching given key.
1229 : * @param __x Key of (key, value) pairs to be located.
1230 : * @return Pair of iterators that possibly points to the subsequence
1231 : * matching given key.
1232 : *
1233 : * This function is equivalent to
1234 : * @code
1235 : * std::make_pair(c.lower_bound(val),
1236 : * c.upper_bound(val))
1237 : * @endcode
1238 : * (but is faster than making the calls separately).
1239 : *
1240 : * This function probably only makes sense for multimaps.
1241 : */
1242 : std::pair<iterator, iterator>
1243 : equal_range(const key_type& __x)
1244 : { return _M_t.equal_range(__x); }
1245 :
1246 : #if __cplusplus > 201103L
1247 : template<typename _Kt>
1248 : auto
1249 : equal_range(const _Kt& __x)
1250 : -> decltype(_M_t._M_equal_range_tr(__x))
1251 : { return _M_t._M_equal_range_tr(__x); }
1252 : #endif
1253 : //@}
1254 :
1255 : //@{
1256 : /**
1257 : * @brief Finds a subsequence matching given key.
1258 : * @param __x Key of (key, value) pairs to be located.
1259 : * @return Pair of read-only (constant) iterators that possibly points
1260 : * to the subsequence matching given key.
1261 : *
1262 : * This function is equivalent to
1263 : * @code
1264 : * std::make_pair(c.lower_bound(val),
1265 : * c.upper_bound(val))
1266 : * @endcode
1267 : * (but is faster than making the calls separately).
1268 : *
1269 : * This function probably only makes sense for multimaps.
1270 : */
1271 : std::pair<const_iterator, const_iterator>
1272 : equal_range(const key_type& __x) const
1273 : { return _M_t.equal_range(__x); }
1274 :
1275 : #if __cplusplus > 201103L
1276 : template<typename _Kt>
1277 : auto
1278 : equal_range(const _Kt& __x) const
1279 : -> decltype(_M_t._M_equal_range_tr(__x))
1280 : { return _M_t._M_equal_range_tr(__x); }
1281 : #endif
1282 : //@}
1283 :
1284 : template<typename _K1, typename _T1, typename _C1, typename _A1>
1285 : friend bool
1286 : operator==(const map<_K1, _T1, _C1, _A1>&,
1287 : const map<_K1, _T1, _C1, _A1>&);
1288 :
1289 : template<typename _K1, typename _T1, typename _C1, typename _A1>
1290 : friend bool
1291 : operator<(const map<_K1, _T1, _C1, _A1>&,
1292 : const map<_K1, _T1, _C1, _A1>&);
1293 : };
1294 :
1295 : /**
1296 : * @brief Map equality comparison.
1297 : * @param __x A %map.
1298 : * @param __y A %map of the same type as @a x.
1299 : * @return True iff the size and elements of the maps are equal.
1300 : *
1301 : * This is an equivalence relation. It is linear in the size of the
1302 : * maps. Maps are considered equivalent if their sizes are equal,
1303 : * and if corresponding elements compare equal.
1304 : */
1305 : template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
1306 : inline bool
1307 : operator==(const map<_Key, _Tp, _Compare, _Alloc>& __x,
1308 : const map<_Key, _Tp, _Compare, _Alloc>& __y)
1309 : { return __x._M_t == __y._M_t; }
1310 :
1311 : /**
1312 : * @brief Map ordering relation.
1313 : * @param __x A %map.
1314 : * @param __y A %map of the same type as @a x.
1315 : * @return True iff @a x is lexicographically less than @a y.
1316 : *
1317 : * This is a total ordering relation. It is linear in the size of the
1318 : * maps. The elements must be comparable with @c <.
1319 : *
1320 : * See std::lexicographical_compare() for how the determination is made.
1321 : */
1322 : template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
1323 : inline bool
1324 : operator<(const map<_Key, _Tp, _Compare, _Alloc>& __x,
1325 : const map<_Key, _Tp, _Compare, _Alloc>& __y)
1326 : { return __x._M_t < __y._M_t; }
1327 :
1328 : /// Based on operator==
1329 : template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
1330 : inline bool
1331 : operator!=(const map<_Key, _Tp, _Compare, _Alloc>& __x,
1332 : const map<_Key, _Tp, _Compare, _Alloc>& __y)
1333 : { return !(__x == __y); }
1334 :
1335 : /// Based on operator<
1336 : template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
1337 : inline bool
1338 : operator>(const map<_Key, _Tp, _Compare, _Alloc>& __x,
1339 : const map<_Key, _Tp, _Compare, _Alloc>& __y)
1340 : { return __y < __x; }
1341 :
1342 : /// Based on operator<
1343 : template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
1344 : inline bool
1345 : operator<=(const map<_Key, _Tp, _Compare, _Alloc>& __x,
1346 : const map<_Key, _Tp, _Compare, _Alloc>& __y)
1347 : { return !(__y < __x); }
1348 :
1349 : /// Based on operator<
1350 : template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
1351 : inline bool
1352 : operator>=(const map<_Key, _Tp, _Compare, _Alloc>& __x,
1353 : const map<_Key, _Tp, _Compare, _Alloc>& __y)
1354 : { return !(__x < __y); }
1355 :
1356 : /// See std::map::swap().
1357 : template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
1358 : inline void
1359 : swap(map<_Key, _Tp, _Compare, _Alloc>& __x,
1360 : map<_Key, _Tp, _Compare, _Alloc>& __y)
1361 : _GLIBCXX_NOEXCEPT_IF(noexcept(__x.swap(__y)))
1362 : { __x.swap(__y); }
1363 :
1364 : _GLIBCXX_END_NAMESPACE_CONTAINER
1365 : } // namespace std
1366 :
1367 : #endif /* _STL_MAP_H */
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