1 // Vector implementation -*- C++ -*-
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56 /** @file stl_vector.h
57 * This is an internal header file, included by other library headers.
58 * You should not attempt to use it directly.
64 #include <bits/stl_iterator_base_funcs.h>
65 #include <bits/functexcept.h>
66 #include <bits/concept_check.h>
68 namespace _GLIBCXX_STD
72 * See bits/stl_deque.h's _Deque_base for an explanation.
75 template<typename _Tp, typename _Alloc>
78 typedef typename _Alloc::template rebind<_Tp>::other _Tp_alloc_type;
81 : public _Tp_alloc_type
85 _Tp* _M_end_of_storage;
86 _Vector_impl(_Tp_alloc_type const& __a)
87 : _Tp_alloc_type(__a), _M_start(0), _M_finish(0), _M_end_of_storage(0)
92 typedef _Alloc allocator_type;
95 _M_get_Tp_allocator() const
96 { return *static_cast<const _Tp_alloc_type*>(&this->_M_impl); }
100 { return _M_get_Tp_allocator(); }
102 _Vector_base(const allocator_type& __a)
106 _Vector_base(size_t __n, const allocator_type& __a)
109 this->_M_impl._M_start = this->_M_allocate(__n);
110 this->_M_impl._M_finish = this->_M_impl._M_start;
111 this->_M_impl._M_end_of_storage = this->_M_impl._M_start + __n;
115 { _M_deallocate(this->_M_impl._M_start, this->_M_impl._M_end_of_storage
116 - this->_M_impl._M_start); }
119 _Vector_impl _M_impl;
122 _M_allocate(size_t __n)
123 { return _M_impl.allocate(__n); }
126 _M_deallocate(_Tp* __p, size_t __n)
129 _M_impl.deallocate(__p, __n);
135 * @brief A standard container which offers fixed time access to
136 * individual elements in any order.
138 * @ingroup Containers
141 * Meets the requirements of a <a href="tables.html#65">container</a>, a
142 * <a href="tables.html#66">reversible container</a>, and a
143 * <a href="tables.html#67">sequence</a>, including the
144 * <a href="tables.html#68">optional sequence requirements</a> with the
145 * %exception of @c push_front and @c pop_front.
147 * In some terminology a %vector can be described as a dynamic
148 * C-style array, it offers fast and efficient access to individual
149 * elements in any order and saves the user from worrying about
150 * memory and size allocation. Subscripting ( @c [] ) access is
151 * also provided as with C-style arrays.
153 template<typename _Tp, typename _Alloc = std::allocator<_Tp> >
154 class vector : protected _Vector_base<_Tp, _Alloc>
156 // Concept requirements.
157 typedef typename _Alloc::value_type _Alloc_value_type;
158 __glibcxx_class_requires(_Tp, _SGIAssignableConcept)
159 __glibcxx_class_requires2(_Tp, _Alloc_value_type, _SameTypeConcept)
161 typedef _Vector_base<_Tp, _Alloc> _Base;
162 typedef vector<_Tp, _Alloc> vector_type;
163 typedef typename _Base::_Tp_alloc_type _Tp_alloc_type;
166 typedef _Tp value_type;
167 typedef typename _Tp_alloc_type::pointer pointer;
168 typedef typename _Tp_alloc_type::const_pointer const_pointer;
169 typedef typename _Tp_alloc_type::reference reference;
170 typedef typename _Tp_alloc_type::const_reference const_reference;
171 typedef __gnu_cxx::__normal_iterator<pointer, vector_type> iterator;
172 typedef __gnu_cxx::__normal_iterator<const_pointer, vector_type>
174 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
175 typedef std::reverse_iterator<iterator> reverse_iterator;
176 typedef size_t size_type;
177 typedef ptrdiff_t difference_type;
178 typedef _Alloc allocator_type;
182 * These two functions and three data members are all from the
183 * base class. They should be pretty self-explanatory, as
184 * %vector uses a simple contiguous allocation scheme. @endif
186 using _Base::_M_allocate;
187 using _Base::_M_deallocate;
188 using _Base::_M_impl;
189 using _Base::_M_get_Tp_allocator;
192 // [23.2.4.1] construct/copy/destroy
193 // (assign() and get_allocator() are also listed in this section)
195 * @brief Default constructor creates no elements.
198 vector(const allocator_type& __a = allocator_type())
203 * @brief Create a %vector with copies of an exemplar element.
204 * @param n The number of elements to initially create.
205 * @param value An element to copy.
207 * This constructor fills the %vector with @a n copies of @a value.
210 vector(size_type __n, const value_type& __value = value_type(),
211 const allocator_type& __a = allocator_type())
214 std::__uninitialized_fill_n_a(this->_M_impl._M_start, __n, __value,
215 _M_get_Tp_allocator());
216 this->_M_impl._M_finish = this->_M_impl._M_start + __n;
220 * @brief %Vector copy constructor.
221 * @param x A %vector of identical element and allocator types.
223 * The newly-created %vector uses a copy of the allocation
224 * object used by @a x. All the elements of @a x are copied,
225 * but any extra memory in
226 * @a x (for fast expansion) will not be copied.
228 vector(const vector& __x)
229 : _Base(__x.size(), __x.get_allocator())
230 { this->_M_impl._M_finish =
231 std::__uninitialized_copy_a(__x.begin(), __x.end(),
232 this->_M_impl._M_start,
233 _M_get_Tp_allocator());
237 * @brief Builds a %vector from a range.
238 * @param first An input iterator.
239 * @param last An input iterator.
241 * Create a %vector consisting of copies of the elements from
244 * If the iterators are forward, bidirectional, or
245 * random-access, then this will call the elements' copy
246 * constructor N times (where N is distance(first,last)) and do
247 * no memory reallocation. But if only input iterators are
248 * used, then this will do at most 2N calls to the copy
249 * constructor, and logN memory reallocations.
251 template<typename _InputIterator>
252 vector(_InputIterator __first, _InputIterator __last,
253 const allocator_type& __a = allocator_type())
256 // Check whether it's an integral type. If so, it's not an iterator.
257 typedef typename std::__is_integer<_InputIterator>::__type _Integral;
258 _M_initialize_dispatch(__first, __last, _Integral());
262 * The dtor only erases the elements, and note that if the
263 * elements themselves are pointers, the pointed-to memory is
264 * not touched in any way. Managing the pointer is the user's
268 { std::_Destroy(this->_M_impl._M_start, this->_M_impl._M_finish,
269 _M_get_Tp_allocator());
273 * @brief %Vector assignment operator.
274 * @param x A %vector of identical element and allocator types.
276 * All the elements of @a x are copied, but any extra memory in
277 * @a x (for fast expansion) will not be copied. Unlike the
278 * copy constructor, the allocator object is not copied.
281 operator=(const vector& __x);
284 * @brief Assigns a given value to a %vector.
285 * @param n Number of elements to be assigned.
286 * @param val Value to be assigned.
288 * This function fills a %vector with @a n copies of the given
289 * value. Note that the assignment completely changes the
290 * %vector and that the resulting %vector's size is the same as
291 * the number of elements assigned. Old data may be lost.
294 assign(size_type __n, const value_type& __val)
295 { _M_fill_assign(__n, __val); }
298 * @brief Assigns a range to a %vector.
299 * @param first An input iterator.
300 * @param last An input iterator.
302 * This function fills a %vector with copies of the elements in the
303 * range [first,last).
305 * Note that the assignment completely changes the %vector and
306 * that the resulting %vector's size is the same as the number
307 * of elements assigned. Old data may be lost.
309 template<typename _InputIterator>
311 assign(_InputIterator __first, _InputIterator __last)
313 // Check whether it's an integral type. If so, it's not an iterator.
314 typedef typename std::__is_integer<_InputIterator>::__type _Integral;
315 _M_assign_dispatch(__first, __last, _Integral());
318 /// Get a copy of the memory allocation object.
319 using _Base::get_allocator;
323 * Returns a read/write iterator that points to the first
324 * element in the %vector. Iteration is done in ordinary
329 { return iterator (this->_M_impl._M_start); }
332 * Returns a read-only (constant) iterator that points to the
333 * first element in the %vector. Iteration is done in ordinary
338 { return const_iterator (this->_M_impl._M_start); }
341 * Returns a read/write iterator that points one past the last
342 * element in the %vector. Iteration is done in ordinary
347 { return iterator (this->_M_impl._M_finish); }
350 * Returns a read-only (constant) iterator that points one past
351 * the last element in the %vector. Iteration is done in
352 * ordinary element order.
356 { return const_iterator (this->_M_impl._M_finish); }
359 * Returns a read/write reverse iterator that points to the
360 * last element in the %vector. Iteration is done in reverse
365 { return reverse_iterator(end()); }
368 * Returns a read-only (constant) reverse iterator that points
369 * to the last element in the %vector. Iteration is done in
370 * reverse element order.
372 const_reverse_iterator
374 { return const_reverse_iterator(end()); }
377 * Returns a read/write reverse iterator that points to one
378 * before the first element in the %vector. Iteration is done
379 * in reverse element order.
383 { return reverse_iterator(begin()); }
386 * Returns a read-only (constant) reverse iterator that points
387 * to one before the first element in the %vector. Iteration
388 * is done in reverse element order.
390 const_reverse_iterator
392 { return const_reverse_iterator(begin()); }
394 // [23.2.4.2] capacity
395 /** Returns the number of elements in the %vector. */
398 { return size_type(end() - begin()); }
400 /** Returns the size() of the largest possible %vector. */
403 { return size_type(-1) / sizeof(value_type); }
406 * @brief Resizes the %vector to the specified number of elements.
407 * @param new_size Number of elements the %vector should contain.
408 * @param x Data with which new elements should be populated.
410 * This function will %resize the %vector to the specified
411 * number of elements. If the number is smaller than the
412 * %vector's current size the %vector is truncated, otherwise
413 * the %vector is extended and new elements are populated with
417 resize(size_type __new_size, value_type __x = value_type())
419 if (__new_size < size())
420 erase(begin() + __new_size, end());
422 insert(end(), __new_size - size(), __x);
426 * Returns the total number of elements that the %vector can
427 * hold before needing to allocate more memory.
431 { return size_type(const_iterator(this->_M_impl._M_end_of_storage)
435 * Returns true if the %vector is empty. (Thus begin() would
440 { return begin() == end(); }
443 * @brief Attempt to preallocate enough memory for specified number of
445 * @param n Number of elements required.
446 * @throw std::length_error If @a n exceeds @c max_size().
448 * This function attempts to reserve enough memory for the
449 * %vector to hold the specified number of elements. If the
450 * number requested is more than max_size(), length_error is
453 * The advantage of this function is that if optimal code is a
454 * necessity and the user can determine the number of elements
455 * that will be required, the user can reserve the memory in
456 * %advance, and thus prevent a possible reallocation of memory
457 * and copying of %vector data.
460 reserve(size_type __n);
464 * @brief Subscript access to the data contained in the %vector.
465 * @param n The index of the element for which data should be
467 * @return Read/write reference to data.
469 * This operator allows for easy, array-style, data access.
470 * Note that data access with this operator is unchecked and
471 * out_of_range lookups are not defined. (For checked lookups
475 operator[](size_type __n)
476 { return *(begin() + __n); }
479 * @brief Subscript access to the data contained in the %vector.
480 * @param n The index of the element for which data should be
482 * @return Read-only (constant) reference to data.
484 * This operator allows for easy, array-style, data access.
485 * Note that data access with this operator is unchecked and
486 * out_of_range lookups are not defined. (For checked lookups
490 operator[](size_type __n) const
491 { return *(begin() + __n); }
494 /// @if maint Safety check used only from at(). @endif
496 _M_range_check(size_type __n) const
498 if (__n >= this->size())
499 __throw_out_of_range(__N("vector::_M_range_check"));
504 * @brief Provides access to the data contained in the %vector.
505 * @param n The index of the element for which data should be
507 * @return Read/write reference to data.
508 * @throw std::out_of_range If @a n is an invalid index.
510 * This function provides for safer data access. The parameter
511 * is first checked that it is in the range of the vector. The
512 * function throws out_of_range if the check fails.
522 * @brief Provides access to the data contained in the %vector.
523 * @param n The index of the element for which data should be
525 * @return Read-only (constant) reference to data.
526 * @throw std::out_of_range If @a n is an invalid index.
528 * This function provides for safer data access. The parameter
529 * is first checked that it is in the range of the vector. The
530 * function throws out_of_range if the check fails.
533 at(size_type __n) const
540 * Returns a read/write reference to the data at the first
541 * element of the %vector.
548 * Returns a read-only (constant) reference to the data at the first
549 * element of the %vector.
556 * Returns a read/write reference to the data at the last
557 * element of the %vector.
561 { return *(end() - 1); }
564 * Returns a read-only (constant) reference to the data at the
565 * last element of the %vector.
569 { return *(end() - 1); }
571 // _GLIBCXX_RESOLVE_LIB_DEFECTS
572 // DR 464. Suggestion for new member functions in standard containers.
575 * Returns a pointer such that [data(), data() + size()) is a valid
576 * range. For a non-empty %vector, data() == &front().
580 { return pointer(this->_M_impl._M_start); }
584 { return const_pointer(this->_M_impl._M_start); }
586 // [23.2.4.3] modifiers
588 * @brief Add data to the end of the %vector.
589 * @param x Data to be added.
591 * This is a typical stack operation. The function creates an
592 * element at the end of the %vector and assigns the given data
593 * to it. Due to the nature of a %vector this operation can be
594 * done in constant time if the %vector has preallocated space
598 push_back(const value_type& __x)
600 if (this->_M_impl._M_finish != this->_M_impl._M_end_of_storage)
602 this->_M_impl.construct(this->_M_impl._M_finish, __x);
603 ++this->_M_impl._M_finish;
606 _M_insert_aux(end(), __x);
610 * @brief Removes last element.
612 * This is a typical stack operation. It shrinks the %vector by one.
614 * Note that no data is returned, and if the last element's
615 * data is needed, it should be retrieved before pop_back() is
621 --this->_M_impl._M_finish;
622 this->_M_impl.destroy(this->_M_impl._M_finish);
626 * @brief Inserts given value into %vector before specified iterator.
627 * @param position An iterator into the %vector.
628 * @param x Data to be inserted.
629 * @return An iterator that points to the inserted data.
631 * This function will insert a copy of the given value before
632 * the specified location. Note that this kind of operation
633 * could be expensive for a %vector and if it is frequently
634 * used the user should consider using std::list.
637 insert(iterator __position, const value_type& __x);
640 * @brief Inserts a number of copies of given data into the %vector.
641 * @param position An iterator into the %vector.
642 * @param n Number of elements to be inserted.
643 * @param x Data to be inserted.
645 * This function will insert a specified number of copies of
646 * the given data before the location specified by @a position.
648 * Note that this kind of operation could be expensive for a
649 * %vector and if it is frequently used the user should
650 * consider using std::list.
653 insert(iterator __position, size_type __n, const value_type& __x)
654 { _M_fill_insert(__position, __n, __x); }
657 * @brief Inserts a range into the %vector.
658 * @param position An iterator into the %vector.
659 * @param first An input iterator.
660 * @param last An input iterator.
662 * This function will insert copies of the data in the range
663 * [first,last) into the %vector before the location specified
666 * Note that this kind of operation could be expensive for a
667 * %vector and if it is frequently used the user should
668 * consider using std::list.
670 template<typename _InputIterator>
672 insert(iterator __position, _InputIterator __first,
673 _InputIterator __last)
675 // Check whether it's an integral type. If so, it's not an iterator.
676 typedef typename std::__is_integer<_InputIterator>::__type _Integral;
677 _M_insert_dispatch(__position, __first, __last, _Integral());
681 * @brief Remove element at given position.
682 * @param position Iterator pointing to element to be erased.
683 * @return An iterator pointing to the next element (or end()).
685 * This function will erase the element at the given position and thus
686 * shorten the %vector by one.
688 * Note This operation could be expensive and if it is
689 * frequently used the user should consider using std::list.
690 * The user is also cautioned that this function only erases
691 * the element, and that if the element is itself a pointer,
692 * the pointed-to memory is not touched in any way. Managing
693 * the pointer is the user's responsibilty.
696 erase(iterator __position);
699 * @brief Remove a range of elements.
700 * @param first Iterator pointing to the first element to be erased.
701 * @param last Iterator pointing to one past the last element to be
703 * @return An iterator pointing to the element pointed to by @a last
704 * prior to erasing (or end()).
706 * This function will erase the elements in the range [first,last) and
707 * shorten the %vector accordingly.
709 * Note This operation could be expensive and if it is
710 * frequently used the user should consider using std::list.
711 * The user is also cautioned that this function only erases
712 * the elements, and that if the elements themselves are
713 * pointers, the pointed-to memory is not touched in any way.
714 * Managing the pointer is the user's responsibilty.
717 erase(iterator __first, iterator __last);
720 * @brief Swaps data with another %vector.
721 * @param x A %vector of the same element and allocator types.
723 * This exchanges the elements between two vectors in constant time.
724 * (Three pointers, so it should be quite fast.)
725 * Note that the global std::swap() function is specialized such that
726 * std::swap(v1,v2) will feed to this function.
731 std::swap(this->_M_impl._M_start, __x._M_impl._M_start);
732 std::swap(this->_M_impl._M_finish, __x._M_impl._M_finish);
733 std::swap(this->_M_impl._M_end_of_storage,
734 __x._M_impl._M_end_of_storage);
738 * Erases all the elements. Note that this function only erases the
739 * elements, and that if the elements themselves are pointers, the
740 * pointed-to memory is not touched in any way. Managing the pointer is
741 * the user's responsibilty.
746 std::_Destroy(this->_M_impl._M_start, this->_M_impl._M_finish,
747 _M_get_Tp_allocator());
748 this->_M_impl._M_finish = this->_M_impl._M_start;
754 * Memory expansion handler. Uses the member allocation function to
755 * obtain @a n bytes of memory, and then copies [first,last) into it.
758 template<typename _ForwardIterator>
760 _M_allocate_and_copy(size_type __n,
761 _ForwardIterator __first, _ForwardIterator __last)
763 pointer __result = this->_M_allocate(__n);
766 std::__uninitialized_copy_a(__first, __last, __result,
767 _M_get_Tp_allocator());
772 _M_deallocate(__result, __n);
773 __throw_exception_again;
778 // Internal constructor functions follow.
780 // Called by the range constructor to implement [23.1.1]/9
781 template<typename _Integer>
783 _M_initialize_dispatch(_Integer __n, _Integer __value, __true_type)
785 this->_M_impl._M_start = _M_allocate(__n);
786 this->_M_impl._M_end_of_storage = this->_M_impl._M_start + __n;
787 std::__uninitialized_fill_n_a(this->_M_impl._M_start, __n, __value,
788 _M_get_Tp_allocator());
789 this->_M_impl._M_finish = this->_M_impl._M_end_of_storage;
792 // Called by the range constructor to implement [23.1.1]/9
793 template<typename _InputIterator>
795 _M_initialize_dispatch(_InputIterator __first, _InputIterator __last,
798 typedef typename std::iterator_traits<_InputIterator>::
799 iterator_category _IterCategory;
800 _M_range_initialize(__first, __last, _IterCategory());
803 // Called by the second initialize_dispatch above
804 template<typename _InputIterator>
806 _M_range_initialize(_InputIterator __first,
807 _InputIterator __last, std::input_iterator_tag)
809 for (; __first != __last; ++__first)
813 // Called by the second initialize_dispatch above
814 template<typename _ForwardIterator>
816 _M_range_initialize(_ForwardIterator __first,
817 _ForwardIterator __last, std::forward_iterator_tag)
819 const size_type __n = std::distance(__first, __last);
820 this->_M_impl._M_start = this->_M_allocate(__n);
821 this->_M_impl._M_end_of_storage = this->_M_impl._M_start + __n;
822 this->_M_impl._M_finish =
823 std::__uninitialized_copy_a(__first, __last,
824 this->_M_impl._M_start,
825 _M_get_Tp_allocator());
829 // Internal assign functions follow. The *_aux functions do the actual
830 // assignment work for the range versions.
832 // Called by the range assign to implement [23.1.1]/9
833 template<typename _Integer>
835 _M_assign_dispatch(_Integer __n, _Integer __val, __true_type)
837 _M_fill_assign(static_cast<size_type>(__n),
838 static_cast<value_type>(__val));
841 // Called by the range assign to implement [23.1.1]/9
842 template<typename _InputIterator>
844 _M_assign_dispatch(_InputIterator __first, _InputIterator __last,
847 typedef typename std::iterator_traits<_InputIterator>::
848 iterator_category _IterCategory;
849 _M_assign_aux(__first, __last, _IterCategory());
852 // Called by the second assign_dispatch above
853 template<typename _InputIterator>
855 _M_assign_aux(_InputIterator __first, _InputIterator __last,
856 std::input_iterator_tag);
858 // Called by the second assign_dispatch above
859 template<typename _ForwardIterator>
861 _M_assign_aux(_ForwardIterator __first, _ForwardIterator __last,
862 std::forward_iterator_tag);
864 // Called by assign(n,t), and the range assign when it turns out
865 // to be the same thing.
867 _M_fill_assign(size_type __n, const value_type& __val);
870 // Internal insert functions follow.
872 // Called by the range insert to implement [23.1.1]/9
873 template<typename _Integer>
875 _M_insert_dispatch(iterator __pos, _Integer __n, _Integer __val,
878 _M_fill_insert(__pos, static_cast<size_type>(__n),
879 static_cast<value_type>(__val));
882 // Called by the range insert to implement [23.1.1]/9
883 template<typename _InputIterator>
885 _M_insert_dispatch(iterator __pos, _InputIterator __first,
886 _InputIterator __last, __false_type)
888 typedef typename std::iterator_traits<_InputIterator>::
889 iterator_category _IterCategory;
890 _M_range_insert(__pos, __first, __last, _IterCategory());
893 // Called by the second insert_dispatch above
894 template<typename _InputIterator>
896 _M_range_insert(iterator __pos, _InputIterator __first,
897 _InputIterator __last, std::input_iterator_tag);
899 // Called by the second insert_dispatch above
900 template<typename _ForwardIterator>
902 _M_range_insert(iterator __pos, _ForwardIterator __first,
903 _ForwardIterator __last, std::forward_iterator_tag);
905 // Called by insert(p,n,x), and the range insert when it turns out to be
908 _M_fill_insert(iterator __pos, size_type __n, const value_type& __x);
910 // Called by insert(p,x)
912 _M_insert_aux(iterator __position, const value_type& __x);
917 * @brief Vector equality comparison.
918 * @param x A %vector.
919 * @param y A %vector of the same type as @a x.
920 * @return True iff the size and elements of the vectors are equal.
922 * This is an equivalence relation. It is linear in the size of the
923 * vectors. Vectors are considered equivalent if their sizes are equal,
924 * and if corresponding elements compare equal.
926 template<typename _Tp, typename _Alloc>
928 operator==(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
929 { return (__x.size() == __y.size()
930 && std::equal(__x.begin(), __x.end(), __y.begin())); }
933 * @brief Vector ordering relation.
934 * @param x A %vector.
935 * @param y A %vector of the same type as @a x.
936 * @return True iff @a x is lexicographically less than @a y.
938 * This is a total ordering relation. It is linear in the size of the
939 * vectors. The elements must be comparable with @c <.
941 * See std::lexicographical_compare() for how the determination is made.
943 template<typename _Tp, typename _Alloc>
945 operator<(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
946 { return std::lexicographical_compare(__x.begin(), __x.end(),
947 __y.begin(), __y.end()); }
949 /// Based on operator==
950 template<typename _Tp, typename _Alloc>
952 operator!=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
953 { return !(__x == __y); }
955 /// Based on operator<
956 template<typename _Tp, typename _Alloc>
958 operator>(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
959 { return __y < __x; }
961 /// Based on operator<
962 template<typename _Tp, typename _Alloc>
964 operator<=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
965 { return !(__y < __x); }
967 /// Based on operator<
968 template<typename _Tp, typename _Alloc>
970 operator>=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
971 { return !(__x < __y); }
973 /// See std::vector::swap().
974 template<typename _Tp, typename _Alloc>
976 swap(vector<_Tp, _Alloc>& __x, vector<_Tp, _Alloc>& __y)
980 #endif /* _VECTOR_H */