1 // List implementation -*- C++ -*-
3 // Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
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 2, or (at your option)
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.
16 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING. If not, write to the Free
18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
21 // As a special exception, you may use this file as part of a free software
22 // library without restriction. Specifically, if other files instantiate
23 // templates or use macros or inline functions from this file, or you compile
24 // this file and link it with other files to produce an executable, this
25 // file does not by itself cause the resulting executable to be covered by
26 // the GNU General Public License. This exception does not however
27 // invalidate any other reasons why the executable file might be covered by
28 // the GNU General Public License.
33 * Hewlett-Packard Company
35 * Permission to use, copy, modify, distribute and sell this software
36 * and its documentation for any purpose is hereby granted without fee,
37 * provided that the above copyright notice appear in all copies and
38 * that both that copyright notice and this permission notice appear
39 * in supporting documentation. Hewlett-Packard Company makes no
40 * representations about the suitability of this software for any
41 * purpose. It is provided "as is" without express or implied warranty.
44 * Copyright (c) 1996,1997
45 * Silicon Graphics Computer Systems, Inc.
47 * Permission to use, copy, modify, distribute and sell this software
48 * and its documentation for any purpose is hereby granted without fee,
49 * provided that the above copyright notice appear in all copies and
50 * that both that copyright notice and this permission notice appear
51 * in supporting documentation. Silicon Graphics makes no
52 * representations about the suitability of this software for any
53 * purpose. It is provided "as is" without express or implied warranty.
57 * This is an internal header file, included by other library headers.
58 * You should not attempt to use it directly.
64 #include <bits/concept_check.h>
66 namespace _GLIBCXX_STD
68 // Supporting structures are split into common and templated types; the
69 // latter publicly inherits from the former in an effort to reduce code
70 // duplication. This results in some "needless" static_cast'ing later on,
71 // but it's all safe downcasting.
73 /// @if maint Common part of a node in the %list. @endif
74 struct _List_node_base
76 _List_node_base
* _M_next
; ///< Self-explanatory
77 _List_node_base
* _M_prev
; ///< Self-explanatory
80 swap(_List_node_base
& __x
, _List_node_base
& __y
);
83 transfer(_List_node_base
* const __first
,
84 _List_node_base
* const __last
);
90 hook(_List_node_base
* const __position
);
96 /// @if maint An actual node in the %list. @endif
97 template<typename _Tp
>
98 struct _List_node
: public _List_node_base
100 _Tp _M_data
; ///< User's data.
104 * @brief A list::iterator.
107 * All the functions are op overloads.
110 template<typename _Tp
>
111 struct _List_iterator
113 typedef _List_iterator
<_Tp
> _Self
;
114 typedef _List_node
<_Tp
> _Node
;
116 typedef ptrdiff_t difference_type
;
117 typedef bidirectional_iterator_tag iterator_category
;
118 typedef _Tp value_type
;
119 typedef _Tp
* pointer
;
120 typedef _Tp
& reference
;
124 _List_iterator(_List_node_base
* __x
)
127 // Must downcast from List_node_base to _List_node to get to _M_data.
130 { return static_cast<_Node
*>(_M_node
)->_M_data
; }
134 { return &static_cast<_Node
*>(_M_node
)->_M_data
; }
139 _M_node
= _M_node
->_M_next
;
147 _M_node
= _M_node
->_M_next
;
154 _M_node
= _M_node
->_M_prev
;
162 _M_node
= _M_node
->_M_prev
;
167 operator==(const _Self
& __x
) const
168 { return _M_node
== __x
._M_node
; }
171 operator!=(const _Self
& __x
) const
172 { return _M_node
!= __x
._M_node
; }
174 // The only member points to the %list element.
175 _List_node_base
* _M_node
;
179 * @brief A list::const_iterator.
182 * All the functions are op overloads.
185 template<typename _Tp
>
186 struct _List_const_iterator
188 typedef _List_const_iterator
<_Tp
> _Self
;
189 typedef const _List_node
<_Tp
> _Node
;
190 typedef _List_iterator
<_Tp
> iterator
;
192 typedef ptrdiff_t difference_type
;
193 typedef bidirectional_iterator_tag iterator_category
;
194 typedef _Tp value_type
;
195 typedef const _Tp
* pointer
;
196 typedef const _Tp
& reference
;
198 _List_const_iterator() { }
200 _List_const_iterator(const _List_node_base
* __x
)
203 _List_const_iterator(const iterator
& __x
)
204 : _M_node(__x
._M_node
) { }
206 // Must downcast from List_node_base to _List_node to get to
210 { return static_cast<_Node
*>(_M_node
)->_M_data
; }
214 { return &static_cast<_Node
*>(_M_node
)->_M_data
; }
219 _M_node
= _M_node
->_M_next
;
227 _M_node
= _M_node
->_M_next
;
234 _M_node
= _M_node
->_M_prev
;
242 _M_node
= _M_node
->_M_prev
;
247 operator==(const _Self
& __x
) const
248 { return _M_node
== __x
._M_node
; }
251 operator!=(const _Self
& __x
) const
252 { return _M_node
!= __x
._M_node
; }
254 // The only member points to the %list element.
255 const _List_node_base
* _M_node
;
258 template<typename _Val
>
260 operator==(const _List_iterator
<_Val
>& __x
,
261 const _List_const_iterator
<_Val
>& __y
)
262 { return __x
._M_node
== __y
._M_node
; }
264 template<typename _Val
>
266 operator!=(const _List_iterator
<_Val
>& __x
,
267 const _List_const_iterator
<_Val
>& __y
)
268 { return __x
._M_node
!= __y
._M_node
; }
273 * See bits/stl_deque.h's _Deque_base for an explanation.
276 template<typename _Tp
, typename _Alloc
>
281 // The stored instance is not actually of "allocator_type"'s
282 // type. Instead we rebind the type to
283 // Allocator<List_node<Tp>>, which according to [20.1.5]/4
284 // should probably be the same. List_node<Tp> is not the same
285 // size as Tp (it's two pointers larger), and specializations on
286 // Tp may go unused because List_node<Tp> is being bound
289 // We put this to the test in the constructors and in
290 // get_allocator, where we use conversions between
291 // allocator_type and _Node_Alloc_type. The conversion is
292 // required by table 32 in [20.1.5].
293 typedef typename
_Alloc::template rebind
<_List_node
<_Tp
> >::other
298 : public _Node_Alloc_type
300 _List_node_base _M_node
;
301 _List_impl (const _Node_Alloc_type
& __a
)
302 : _Node_Alloc_type(__a
)
310 { return _M_impl
._Node_Alloc_type::allocate(1); }
313 _M_put_node(_List_node
<_Tp
>* __p
)
314 { _M_impl
._Node_Alloc_type::deallocate(__p
, 1); }
317 typedef _Alloc allocator_type
;
320 get_allocator() const
321 { return allocator_type(*static_cast<
322 const _Node_Alloc_type
*>(&this->_M_impl
)); }
324 _List_base(const allocator_type
& __a
)
328 // This is what actually destroys the list.
338 this->_M_impl
._M_node
._M_next
= &this->_M_impl
._M_node
;
339 this->_M_impl
._M_node
._M_prev
= &this->_M_impl
._M_node
;
344 * @brief A standard container with linear time access to elements,
345 * and fixed time insertion/deletion at any point in the sequence.
347 * @ingroup Containers
350 * Meets the requirements of a <a href="tables.html#65">container</a>, a
351 * <a href="tables.html#66">reversible container</a>, and a
352 * <a href="tables.html#67">sequence</a>, including the
353 * <a href="tables.html#68">optional sequence requirements</a> with the
354 * %exception of @c at and @c operator[].
356 * This is a @e doubly @e linked %list. Traversal up and down the
357 * %list requires linear time, but adding and removing elements (or
358 * @e nodes) is done in constant time, regardless of where the
359 * change takes place. Unlike std::vector and std::deque,
360 * random-access iterators are not provided, so subscripting ( @c
361 * [] ) access is not allowed. For algorithms which only need
362 * sequential access, this lack makes no difference.
364 * Also unlike the other standard containers, std::list provides
365 * specialized algorithms %unique to linked lists, such as
366 * splicing, sorting, and in-place reversal.
369 * A couple points on memory allocation for list<Tp>:
371 * First, we never actually allocate a Tp, we allocate
372 * List_node<Tp>'s and trust [20.1.5]/4 to DTRT. This is to ensure
373 * that after elements from %list<X,Alloc1> are spliced into
374 * %list<X,Alloc2>, destroying the memory of the second %list is a
375 * valid operation, i.e., Alloc1 giveth and Alloc2 taketh away.
377 * Second, a %list conceptually represented as
379 * A <---> B <---> C <---> D
381 * is actually circular; a link exists between A and D. The %list
382 * class holds (as its only data member) a private list::iterator
383 * pointing to @e D, not to @e A! To get to the head of the %list,
384 * we start at the tail and move forward by one. When this member
385 * iterator's next/previous pointers refer to itself, the %list is
388 template<typename _Tp
, typename _Alloc
= allocator
<_Tp
> >
389 class list
: protected _List_base
<_Tp
, _Alloc
>
391 // concept requirements
392 __glibcxx_class_requires(_Tp
, _SGIAssignableConcept
)
394 typedef _List_base
<_Tp
, _Alloc
> _Base
;
397 typedef _Tp value_type
;
398 typedef typename
_Alloc::pointer pointer
;
399 typedef typename
_Alloc::const_pointer const_pointer
;
400 typedef typename
_Alloc::reference reference
;
401 typedef typename
_Alloc::const_reference const_reference
;
402 typedef _List_iterator
<_Tp
> iterator
;
403 typedef _List_const_iterator
<_Tp
> const_iterator
;
404 typedef std::reverse_iterator
<const_iterator
> const_reverse_iterator
;
405 typedef std::reverse_iterator
<iterator
> reverse_iterator
;
406 typedef size_t size_type
;
407 typedef ptrdiff_t difference_type
;
408 typedef typename
_Base::allocator_type allocator_type
;
411 // Note that pointers-to-_Node's can be ctor-converted to
413 typedef _List_node
<_Tp
> _Node
;
416 * One data member plus two memory-handling functions. If the
417 * _Alloc type requires separate instances, then one of those
418 * will also be included, accumulated from the topmost parent.
421 using _Base::_M_impl
;
422 using _Base::_M_put_node
;
423 using _Base::_M_get_node
;
427 * @param x An instance of user data.
429 * Allocates space for a new node and constructs a copy of @a x in it.
433 _M_create_node(const value_type
& __x
)
435 _Node
* __p
= this->_M_get_node();
438 this->get_allocator().construct(&__p
->_M_data
, __x
);
443 __throw_exception_again
;
449 // [23.2.2.1] construct/copy/destroy
450 // (assign() and get_allocator() are also listed in this section)
452 * @brief Default constructor creates no elements.
455 list(const allocator_type
& __a
= allocator_type())
459 * @brief Create a %list with copies of an exemplar element.
460 * @param n The number of elements to initially create.
461 * @param value An element to copy.
463 * This constructor fills the %list with @a n copies of @a value.
465 list(size_type __n
, const value_type
& __value
,
466 const allocator_type
& __a
= allocator_type())
468 { this->insert(begin(), __n
, __value
); }
471 * @brief Create a %list with default elements.
472 * @param n The number of elements to initially create.
474 * This constructor fills the %list with @a n copies of a
475 * default-constructed element.
479 : _Base(allocator_type())
480 { this->insert(begin(), __n
, value_type()); }
483 * @brief %List copy constructor.
484 * @param x A %list of identical element and allocator types.
486 * The newly-created %list uses a copy of the allocation object used
489 list(const list
& __x
)
490 : _Base(__x
.get_allocator())
491 { this->insert(begin(), __x
.begin(), __x
.end()); }
494 * @brief Builds a %list from a range.
495 * @param first An input iterator.
496 * @param last An input iterator.
498 * Create a %list consisting of copies of the elements from
499 * [@a first,@a last). This is linear in N (where N is
500 * distance(@a first,@a last)).
503 * We don't need any dispatching tricks here, because insert does all of
507 template<typename _InputIterator
>
508 list(_InputIterator __first
, _InputIterator __last
,
509 const allocator_type
& __a
= allocator_type())
511 { this->insert(begin(), __first
, __last
); }
514 * No explicit dtor needed as the _Base dtor takes care of
515 * things. The _Base dtor only erases the elements, and note
516 * that if the elements themselves are pointers, the pointed-to
517 * memory is not touched in any way. Managing the pointer is
518 * the user's responsibilty.
522 * @brief %List assignment operator.
523 * @param x A %list of identical element and allocator types.
525 * All the elements of @a x are copied, but unlike the copy
526 * constructor, the allocator object is not copied.
529 operator=(const list
& __x
);
532 * @brief Assigns a given value to a %list.
533 * @param n Number of elements to be assigned.
534 * @param val Value to be assigned.
536 * This function fills a %list with @a n copies of the given
537 * value. Note that the assignment completely changes the %list
538 * and that the resulting %list's size is the same as the number
539 * of elements assigned. Old data may be lost.
542 assign(size_type __n
, const value_type
& __val
)
543 { _M_fill_assign(__n
, __val
); }
546 * @brief Assigns a range to a %list.
547 * @param first An input iterator.
548 * @param last An input iterator.
550 * This function fills a %list with copies of the elements in the
551 * range [@a first,@a last).
553 * Note that the assignment completely changes the %list and
554 * that the resulting %list's size is the same as the number of
555 * elements assigned. Old data may be lost.
557 template<typename _InputIterator
>
559 assign(_InputIterator __first
, _InputIterator __last
)
561 // Check whether it's an integral type. If so, it's not an iterator.
562 typedef typename _Is_integer
<_InputIterator
>::_Integral _Integral
;
563 _M_assign_dispatch(__first
, __last
, _Integral());
566 /// Get a copy of the memory allocation object.
568 get_allocator() const
569 { return _Base::get_allocator(); }
573 * Returns a read/write iterator that points to the first element in the
574 * %list. Iteration is done in ordinary element order.
578 { return this->_M_impl
._M_node
._M_next
; }
581 * Returns a read-only (constant) iterator that points to the
582 * first element in the %list. Iteration is done in ordinary
587 { return this->_M_impl
._M_node
._M_next
; }
590 * Returns a read/write iterator that points one past the last
591 * element in the %list. Iteration is done in ordinary element
595 end() { return &this->_M_impl
._M_node
; }
598 * Returns a read-only (constant) iterator that points one past
599 * the last element in the %list. Iteration is done in ordinary
604 { return &this->_M_impl
._M_node
; }
607 * Returns a read/write reverse iterator that points to the last
608 * element in the %list. Iteration is done in reverse element
613 { return reverse_iterator(end()); }
616 * Returns a read-only (constant) reverse iterator that points to
617 * the last element in the %list. Iteration is done in reverse
620 const_reverse_iterator
622 { return const_reverse_iterator(end()); }
625 * Returns a read/write reverse iterator that points to one
626 * before the first element in the %list. Iteration is done in
627 * reverse element order.
631 { return reverse_iterator(begin()); }
634 * Returns a read-only (constant) reverse iterator that points to one
635 * before the first element in the %list. Iteration is done in reverse
638 const_reverse_iterator
640 { return const_reverse_iterator(begin()); }
642 // [23.2.2.2] capacity
644 * Returns true if the %list is empty. (Thus begin() would equal
649 { return this->_M_impl
._M_node
._M_next
== &this->_M_impl
._M_node
; }
651 /** Returns the number of elements in the %list. */
654 { return std::distance(begin(), end()); }
656 /** Returns the size() of the largest possible %list. */
659 { return size_type(-1); }
662 * @brief Resizes the %list to the specified number of elements.
663 * @param new_size Number of elements the %list should contain.
664 * @param x Data with which new elements should be populated.
666 * This function will %resize the %list to the specified number
667 * of elements. If the number is smaller than the %list's
668 * current size the %list is truncated, otherwise the %list is
669 * extended and new elements are populated with given data.
672 resize(size_type __new_size
, const value_type
& __x
);
675 * @brief Resizes the %list to the specified number of elements.
676 * @param new_size Number of elements the %list should contain.
678 * This function will resize the %list to the specified number of
679 * elements. If the number is smaller than the %list's current
680 * size the %list is truncated, otherwise the %list is extended
681 * and new elements are default-constructed.
684 resize(size_type __new_size
)
685 { this->resize(__new_size
, value_type()); }
689 * Returns a read/write reference to the data at the first
690 * element of the %list.
697 * Returns a read-only (constant) reference to the data at the first
698 * element of the %list.
705 * Returns a read/write reference to the data at the last element
710 { return *(--end()); }
713 * Returns a read-only (constant) reference to the data at the last
714 * element of the %list.
718 { return *(--end()); }
720 // [23.2.2.3] modifiers
722 * @brief Add data to the front of the %list.
723 * @param x Data to be added.
725 * This is a typical stack operation. The function creates an
726 * element at the front of the %list and assigns the given data
727 * to it. Due to the nature of a %list this operation can be
728 * done in constant time, and does not invalidate iterators and
732 push_front(const value_type
& __x
)
733 { this->_M_insert(begin(), __x
); }
736 * @brief Removes first element.
738 * This is a typical stack operation. It shrinks the %list by
739 * one. Due to the nature of a %list this operation can be done
740 * in constant time, and only invalidates iterators/references to
741 * the element being removed.
743 * Note that no data is returned, and if the first element's data
744 * is needed, it should be retrieved before pop_front() is
749 { this->_M_erase(begin()); }
752 * @brief Add data to the end of the %list.
753 * @param x Data to be added.
755 * This is a typical stack operation. The function creates an
756 * element at the end of the %list and assigns the given data to
757 * it. Due to the nature of a %list this operation can be done
758 * in constant time, and does not invalidate iterators and
762 push_back(const value_type
& __x
)
763 { this->_M_insert(end(), __x
); }
766 * @brief Removes last element.
768 * This is a typical stack operation. It shrinks the %list by
769 * one. Due to the nature of a %list this operation can be done
770 * in constant time, and only invalidates iterators/references to
771 * the element being removed.
773 * Note that no data is returned, and if the last element's data
774 * is needed, it should be retrieved before pop_back() is called.
778 { this->_M_erase(this->_M_impl
._M_node
._M_prev
); }
781 * @brief Inserts given value into %list before specified iterator.
782 * @param position An iterator into the %list.
783 * @param x Data to be inserted.
784 * @return An iterator that points to the inserted data.
786 * This function will insert a copy of the given value before
787 * the specified location. Due to the nature of a %list this
788 * operation can be done in constant time, and does not
789 * invalidate iterators and references.
792 insert(iterator __position
, const value_type
& __x
);
795 * @brief Inserts a number of copies of given data into the %list.
796 * @param position An iterator into the %list.
797 * @param n Number of elements to be inserted.
798 * @param x Data to be inserted.
800 * This function will insert a specified number of copies of the
801 * given data before the location specified by @a position.
803 * Due to the nature of a %list this operation can be done in
804 * constant time, and does not invalidate iterators and
808 insert(iterator __position
, size_type __n
, const value_type
& __x
)
809 { _M_fill_insert(__position
, __n
, __x
); }
812 * @brief Inserts a range into the %list.
813 * @param position An iterator into the %list.
814 * @param first An input iterator.
815 * @param last An input iterator.
817 * This function will insert copies of the data in the range [@a
818 * first,@a last) into the %list before the location specified by
821 * Due to the nature of a %list this operation can be done in
822 * constant time, and does not invalidate iterators and
825 template<typename _InputIterator
>
827 insert(iterator __position
, _InputIterator __first
,
828 _InputIterator __last
)
830 // Check whether it's an integral type. If so, it's not an iterator.
831 typedef typename _Is_integer
<_InputIterator
>::_Integral _Integral
;
832 _M_insert_dispatch(__position
, __first
, __last
, _Integral());
836 * @brief Remove element at given position.
837 * @param position Iterator pointing to element to be erased.
838 * @return An iterator pointing to the next element (or end()).
840 * This function will erase the element at the given position and thus
841 * shorten the %list by one.
843 * Due to the nature of a %list this operation can be done in
844 * constant time, and only invalidates iterators/references to
845 * the element being removed. The user is also cautioned that
846 * this function only erases the element, and that if the element
847 * is itself a pointer, the pointed-to memory is not touched in
848 * any way. Managing the pointer is the user's responsibilty.
851 erase(iterator __position
);
854 * @brief Remove a range of elements.
855 * @param first Iterator pointing to the first element to be erased.
856 * @param last Iterator pointing to one past the last element to be
858 * @return An iterator pointing to the element pointed to by @a last
859 * prior to erasing (or end()).
861 * This function will erase the elements in the range @a
862 * [first,last) and shorten the %list accordingly.
864 * Due to the nature of a %list this operation can be done in
865 * constant time, and only invalidates iterators/references to
866 * the element being removed. The user is also cautioned that
867 * this function only erases the elements, and that if the
868 * elements themselves are pointers, the pointed-to memory is not
869 * touched in any way. Managing the pointer is the user's
873 erase(iterator __first
, iterator __last
)
875 while (__first
!= __last
)
876 __first
= erase(__first
);
881 * @brief Swaps data with another %list.
882 * @param x A %list of the same element and allocator types.
884 * This exchanges the elements between two lists in constant
885 * time. Note that the global std::swap() function is
886 * specialized such that std::swap(l1,l2) will feed to this
891 { _List_node_base::swap(this->_M_impl
._M_node
, __x
._M_impl
._M_node
); }
894 * Erases all the elements. Note that this function only erases
895 * the elements, and that if the elements themselves are
896 * pointers, the pointed-to memory is not touched in any way.
897 * Managing the pointer is the user's responsibilty.
906 // [23.2.2.4] list operations
908 * @brief Insert contents of another %list.
909 * @param position Iterator referencing the element to insert before.
910 * @param x Source list.
912 * The elements of @a x are inserted in constant time in front of
913 * the element referenced by @a position. @a x becomes an empty
917 splice(iterator __position
, list
& __x
)
920 this->_M_transfer(__position
, __x
.begin(), __x
.end());
924 * @brief Insert element from another %list.
925 * @param position Iterator referencing the element to insert before.
926 * @param x Source list.
927 * @param i Iterator referencing the element to move.
929 * Removes the element in list @a x referenced by @a i and
930 * inserts it into the current list before @a position.
933 splice(iterator __position
, list
&, iterator __i
)
937 if (__position
== __i
|| __position
== __j
)
939 this->_M_transfer(__position
, __i
, __j
);
943 * @brief Insert range from another %list.
944 * @param position Iterator referencing the element to insert before.
945 * @param x Source list.
946 * @param first Iterator referencing the start of range in x.
947 * @param last Iterator referencing the end of range in x.
949 * Removes elements in the range [first,last) and inserts them
950 * before @a position in constant time.
952 * Undefined if @a position is in [first,last).
955 splice(iterator __position
, list
&, iterator __first
, iterator __last
)
957 if (__first
!= __last
)
958 this->_M_transfer(__position
, __first
, __last
);
962 * @brief Remove all elements equal to value.
963 * @param value The value to remove.
965 * Removes every element in the list equal to @a value.
966 * Remaining elements stay in list order. Note that this
967 * function only erases the elements, and that if the elements
968 * themselves are pointers, the pointed-to memory is not
969 * touched in any way. Managing the pointer is the user's
973 remove(const _Tp
& __value
);
976 * @brief Remove all elements satisfying a predicate.
977 * @param Predicate Unary predicate function or object.
979 * Removes every element in the list for which the predicate
980 * returns true. Remaining elements stay in list order. Note
981 * that this function only erases the elements, and that if the
982 * elements themselves are pointers, the pointed-to memory is
983 * not touched in any way. Managing the pointer is the user's
986 template<typename _Predicate
>
988 remove_if(_Predicate
);
991 * @brief Remove consecutive duplicate elements.
993 * For each consecutive set of elements with the same value,
994 * remove all but the first one. Remaining elements stay in
995 * list order. Note that this function only erases the
996 * elements, and that if the elements themselves are pointers,
997 * the pointed-to memory is not touched in any way. Managing
998 * the pointer is the user's responsibilty.
1004 * @brief Remove consecutive elements satisfying a predicate.
1005 * @param BinaryPredicate Binary predicate function or object.
1007 * For each consecutive set of elements [first,last) that
1008 * satisfy predicate(first,i) where i is an iterator in
1009 * [first,last), remove all but the first one. Remaining
1010 * elements stay in list order. Note that this function only
1011 * erases the elements, and that if the elements themselves are
1012 * pointers, the pointed-to memory is not touched in any way.
1013 * Managing the pointer is the user's responsibilty.
1015 template<typename _BinaryPredicate
>
1017 unique(_BinaryPredicate
);
1020 * @brief Merge sorted lists.
1021 * @param x Sorted list to merge.
1023 * Assumes that both @a x and this list are sorted according to
1024 * operator<(). Merges elements of @a x into this list in
1025 * sorted order, leaving @a x empty when complete. Elements in
1026 * this list precede elements in @a x that are equal.
1032 * @brief Merge sorted lists according to comparison function.
1033 * @param x Sorted list to merge.
1034 * @param StrictWeakOrdering Comparison function definining
1037 * Assumes that both @a x and this list are sorted according to
1038 * StrictWeakOrdering. Merges elements of @a x into this list
1039 * in sorted order, leaving @a x empty when complete. Elements
1040 * in this list precede elements in @a x that are equivalent
1041 * according to StrictWeakOrdering().
1043 template<typename _StrictWeakOrdering
>
1045 merge(list
&, _StrictWeakOrdering
);
1048 * @brief Reverse the elements in list.
1050 * Reverse the order of elements in the list in linear time.
1054 { this->_M_impl
._M_node
.reverse(); }
1057 * @brief Sort the elements.
1059 * Sorts the elements of this list in NlogN time. Equivalent
1060 * elements remain in list order.
1066 * @brief Sort the elements according to comparison function.
1068 * Sorts the elements of this list in NlogN time. Equivalent
1069 * elements remain in list order.
1071 template<typename _StrictWeakOrdering
>
1073 sort(_StrictWeakOrdering
);
1076 // Internal assign functions follow.
1078 // Called by the range assign to implement [23.1.1]/9
1079 template<typename _Integer
>
1081 _M_assign_dispatch(_Integer __n
, _Integer __val
, __true_type
)
1083 _M_fill_assign(static_cast<size_type
>(__n
),
1084 static_cast<value_type
>(__val
));
1087 // Called by the range assign to implement [23.1.1]/9
1088 template<typename _InputIterator
>
1090 _M_assign_dispatch(_InputIterator __first
, _InputIterator __last
,
1093 // Called by assign(n,t), and the range assign when it turns out
1094 // to be the same thing.
1096 _M_fill_assign(size_type __n
, const value_type
& __val
);
1099 // Internal insert functions follow.
1101 // Called by the range insert to implement [23.1.1]/9
1102 template<typename _Integer
>
1104 _M_insert_dispatch(iterator __pos
, _Integer __n
, _Integer __x
,
1107 _M_fill_insert(__pos
, static_cast<size_type
>(__n
),
1108 static_cast<value_type
>(__x
));
1111 // Called by the range insert to implement [23.1.1]/9
1112 template<typename _InputIterator
>
1114 _M_insert_dispatch(iterator __pos
,
1115 _InputIterator __first
, _InputIterator __last
,
1118 for (; __first
!= __last
; ++__first
)
1119 _M_insert(__pos
, *__first
);
1122 // Called by insert(p,n,x), and the range insert when it turns out
1123 // to be the same thing.
1125 _M_fill_insert(iterator __pos
, size_type __n
, const value_type
& __x
)
1127 for (; __n
> 0; --__n
)
1128 _M_insert(__pos
, __x
);
1132 // Moves the elements from [first,last) before position.
1134 _M_transfer(iterator __position
, iterator __first
, iterator __last
)
1135 { __position
._M_node
->transfer(__first
._M_node
, __last
._M_node
); }
1137 // Inserts new element at position given and with value given.
1139 _M_insert(iterator __position
, const value_type
& __x
)
1141 _Node
* __tmp
= _M_create_node(__x
);
1142 __tmp
->hook(__position
._M_node
);
1145 // Erases element at position given.
1147 _M_erase(iterator __position
)
1149 __position
._M_node
->unhook();
1150 _Node
* __n
= static_cast<_Node
*>(__position
._M_node
);
1151 this->get_allocator().destroy(&__n
->_M_data
);
1157 * @brief List equality comparison.
1159 * @param y A %list of the same type as @a x.
1160 * @return True iff the size and elements of the lists are equal.
1162 * This is an equivalence relation. It is linear in the size of
1163 * the lists. Lists are considered equivalent if their sizes are
1164 * equal, and if corresponding elements compare equal.
1166 template<typename _Tp
, typename _Alloc
>
1168 operator==(const list
<_Tp
, _Alloc
>& __x
, const list
<_Tp
, _Alloc
>& __y
)
1170 typedef typename list
<_Tp
, _Alloc
>::const_iterator const_iterator
;
1171 const_iterator __end1
= __x
.end();
1172 const_iterator __end2
= __y
.end();
1174 const_iterator __i1
= __x
.begin();
1175 const_iterator __i2
= __y
.begin();
1176 while (__i1
!= __end1
&& __i2
!= __end2
&& *__i1
== *__i2
)
1181 return __i1
== __end1
&& __i2
== __end2
;
1185 * @brief List ordering relation.
1187 * @param y A %list of the same type as @a x.
1188 * @return True iff @a x is lexicographically less than @a y.
1190 * This is a total ordering relation. It is linear in the size of the
1191 * lists. The elements must be comparable with @c <.
1193 * See std::lexicographical_compare() for how the determination is made.
1195 template<typename _Tp
, typename _Alloc
>
1197 operator<(const list
<_Tp
, _Alloc
>& __x
, const list
<_Tp
, _Alloc
>& __y
)
1198 { return std::lexicographical_compare(__x
.begin(), __x
.end(),
1199 __y
.begin(), __y
.end()); }
1201 /// Based on operator==
1202 template<typename _Tp
, typename _Alloc
>
1204 operator!=(const list
<_Tp
, _Alloc
>& __x
, const list
<_Tp
, _Alloc
>& __y
)
1205 { return !(__x
== __y
); }
1207 /// Based on operator<
1208 template<typename _Tp
, typename _Alloc
>
1210 operator>(const list
<_Tp
, _Alloc
>& __x
, const list
<_Tp
, _Alloc
>& __y
)
1211 { return __y
< __x
; }
1213 /// Based on operator<
1214 template<typename _Tp
, typename _Alloc
>
1216 operator<=(const list
<_Tp
, _Alloc
>& __x
, const list
<_Tp
, _Alloc
>& __y
)
1217 { return !(__y
< __x
); }
1219 /// Based on operator<
1220 template<typename _Tp
, typename _Alloc
>
1222 operator>=(const list
<_Tp
, _Alloc
>& __x
, const list
<_Tp
, _Alloc
>& __y
)
1223 { return !(__x
< __y
); }
1225 /// See std::list::swap().
1226 template<typename _Tp
, typename _Alloc
>
1228 swap(list
<_Tp
, _Alloc
>& __x
, list
<_Tp
, _Alloc
>& __y
)
1232 #endif /* _LIST_H */