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// Vector implementation -- C++ -- // Copyright (C) 2001-2018 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /* * * Copyright (c) 1994 * Hewlett-Packard Company * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Hewlett-Packard Company makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. * * * Copyright (c) 1996 * Silicon Graphics Computer Systems, Inc. * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Silicon Graphics makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. / /* @file bits/stl_vector.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{vector} / #ifndef _STL_VECTOR_H #define _STL_VECTOR_H 1 #include <bits/stl_iterator_base_funcs.h> #include <bits/functexcept.h> #include <bits/concept_check.h> #if __cplusplus >= 201103L #include <initializer_list> #endif #include <debug/assertions.h> #if _GLIBCXX_SANITIZE_STD_ALLOCATOR && _GLIBCXX_SANITIZE_VECTOR extern "C" void __sanitizer_annotate_contiguous_container(const void, const void, const void, const void); #endif namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION _GLIBCXX_BEGIN_NAMESPACE_CONTAINER /// See bits/stl_deque.h's _Deque_base for an explanation. template<typename _Tp, typename _Alloc> struct _Vector_base { typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template rebind<_Tp>::other _Tp_alloc_type; typedef typename __gnu_cxx::__alloc_traits<_Tp_alloc_type>::pointer pointer; struct _Vector_impl : public _Tp_alloc_type { pointer _M_start; pointer _M_finish; pointer _M_end_of_storage; _Vector_impl() : _Tp_alloc_type(), _M_start(), _M_finish(), _M_end_of_storage() { } _Vector_impl(_Tp_alloc_type const& __a) _GLIBCXX_NOEXCEPT : _Tp_alloc_type(__a), _M_start(), _M_finish(), _M_end_of_storage() { } #if __cplusplus >= 201103L _Vector_impl(_Tp_alloc_type&& __a) noexcept : _Tp_alloc_type(std::move(__a)), _M_start(), _M_finish(), _M_end_of_storage() { } #endif void _M_swap_data(_Vector_impl& __x) _GLIBCXX_NOEXCEPT { std::swap(_M_start, __x._M_start); std::swap(_M_finish, __x._M_finish); std::swap(_M_end_of_storage, __x._M_end_of_storage); } #if _GLIBCXX_SANITIZE_STD_ALLOCATOR && _GLIBCXX_SANITIZE_VECTOR template<typename = _Tp_alloc_type> struct _Asan { typedef typename __gnu_cxx::__alloc_traits<_Tp_alloc_type> ::size_type size_type; static void _S_shrink(_Vector_impl&, size_type) { } static void _S_on_dealloc(_Vector_impl&) { } typedef _Vector_impl& _Reinit; struct _Grow { _Grow(_Vector_impl&, size_type) { } void _M_grew(size_type) { } }; }; // Enable ASan annotations for memory obtained from std::allocator. template<typename _Up> struct _Asan<allocator<_Up> > { typedef typename __gnu_cxx::__alloc_traits<_Tp_alloc_type> ::size_type size_type; // Adjust ASan annotation for [_M_start, _M_end_of_storage) to // mark end of valid region as __curr instead of __prev. static void _S_adjust(_Vector_impl& __impl, pointer __prev, pointer __curr) { __sanitizer_annotate_contiguous_container(__impl._M_start, __impl._M_end_of_storage, __prev, __curr); } static void _S_grow(_Vector_impl& __impl, size_type __n) { _S_adjust(__impl, __impl._M_finish, __impl._M_finish + __n); } static void _S_shrink(_Vector_impl& __impl, size_type __n) { _S_adjust(__impl, __impl._M_finish + __n, __impl._M_finish); } static void _S_on_dealloc(_Vector_impl& __impl) { if (__impl._M_start) _S_adjust(__impl, __impl._M_finish, __impl._M_end_of_storage); } // Used on reallocation to tell ASan unused capacity is invalid. struct _Reinit { explicit _Reinit(_Vector_impl& __impl) : _M_impl(__impl) { // Mark unused capacity as valid again before deallocating it. _S_on_dealloc(_M_impl); } ~_Reinit() { // Mark unused capacity as invalid after reallocation. if (_M_impl._M_start) _S_adjust(_M_impl, _M_impl._M_end_of_storage, _M_impl._M_finish); } _Vector_impl& _M_impl; #if __cplusplus >= 201103L _Reinit(const _Reinit&) = delete; _Reinit& operator=(const _Reinit&) = delete; #endif }; // Tell ASan when unused capacity is initialized to be valid. struct _Grow { _Grow(_Vector_impl& __impl, size_type __n) : _M_impl(__impl), _M_n(__n) { _S_grow(_M_impl, __n); } ~_Grow() { if (_M_n) _S_shrink(_M_impl, _M_n); } void _M_grew(size_type __n) { _M_n -= __n; } #if __cplusplus >= 201103L _Grow(const _Grow&) = delete; _Grow& operator=(const _Grow&) = delete; #endif private: _Vector_impl& _M_impl; size_type _M_n; }; }; #define _GLIBCXX_ASAN_ANNOTATE_REINIT \ typename _Base::_Vector_impl::template _Asan<>::_Reinit const \ __attribute__((__unused__)) __reinit_guard(this->_M_impl) #define _GLIBCXX_ASAN_ANNOTATE_GROW(n) \ typename _Base::_Vector_impl::template _Asan<>::_Grow \ __attribute__((__unused__)) __grow_guard(this->_M_impl, (n)) #define _GLIBCXX_ASAN_ANNOTATE_GREW(n) __grow_guard._M_grew(n) #define _GLIBCXX_ASAN_ANNOTATE_SHRINK(n) \ _Base::_Vector_impl::template _Asan<>::_S_shrink(this->_M_impl, n) #define _GLIBCXX_ASAN_ANNOTATE_BEFORE_DEALLOC \ _Base::_Vector_impl::template _Asan<>::_S_on_dealloc(this->_M_impl) #else // ! (_GLIBCXX_SANITIZE_STD_ALLOCATOR && _GLIBCXX_SANITIZE_VECTOR) #define _GLIBCXX_ASAN_ANNOTATE_REINIT #define _GLIBCXX_ASAN_ANNOTATE_GROW(n) #define _GLIBCXX_ASAN_ANNOTATE_GREW(n) #define _GLIBCXX_ASAN_ANNOTATE_SHRINK(n) #define _GLIBCXX_ASAN_ANNOTATE_BEFORE_DEALLOC #endif // _GLIBCXX_SANITIZE_STD_ALLOCATOR && _GLIBCXX_SANITIZE_VECTOR }; public: typedef _Alloc allocator_type; _Tp_alloc_type& _M_get_Tp_allocator() _GLIBCXX_NOEXCEPT { return static_cast<_Tp_alloc_type>(&this->_M_impl); } const _Tp_alloc_type& _M_get_Tp_allocator() const _GLIBCXX_NOEXCEPT { return static_cast<const _Tp_alloc_type>(&this->_M_impl); } allocator_type get_allocator() const _GLIBCXX_NOEXCEPT { return allocator_type(_M_get_Tp_allocator()); } _Vector_base() : _M_impl() { } _Vector_base(const allocator_type& __a) _GLIBCXX_NOEXCEPT : _M_impl(__a) { } _Vector_base(size_t __n) : _M_impl() { _M_create_storage(__n); } _Vector_base(size_t __n, const allocator_type& __a) : _M_impl(__a) { _M_create_storage(__n); } #if __cplusplus >= 201103L _Vector_base(_Tp_alloc_type&& __a) noexcept : _M_impl(std::move(__a)) { } _Vector_base(_Vector_base&& __x) noexcept : _M_impl(std::move(__x._M_get_Tp_allocator())) { this->_M_impl._M_swap_data(__x._M_impl); } _Vector_base(_Vector_base&& __x, const allocator_type& __a) : _M_impl(__a) { if (__x.get_allocator() == __a) this->_M_impl._M_swap_data(__x._M_impl); else { size_t __n = __x._M_impl._M_finish - __x._M_impl._M_start; _M_create_storage(__n); } } #endif ~_Vector_base() _GLIBCXX_NOEXCEPT { _M_deallocate(_M_impl._M_start, _M_impl._M_end_of_storage - _M_impl._M_start); } public: _Vector_impl _M_impl; pointer _M_allocate(size_t __n) { typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Tr; return __n != 0 ? _Tr::allocate(_M_impl, __n) : pointer(); } void _M_deallocate(pointer __p, size_t __n) { typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Tr; if (__p) _Tr::deallocate(_M_impl, __p, __n); } private: void _M_create_storage(size_t __n) { this->_M_impl._M_start = this->_M_allocate(__n); this->_M_impl._M_finish = this->_M_impl._M_start; this->_M_impl._M_end_of_storage = this->_M_impl._M_start + __n; } }; /* * @brief A standard container which offers fixed time access to * individual elements in any order. * * @ingroup sequences * * @tparam _Tp Type of element. * @tparam _Alloc Allocator type, defaults to allocator<_Tp>. * * Meets the requirements of a <a href="tables.html#65">container</a>, a * <a href="tables.html#66">reversible container</a>, and a * <a href="tables.html#67">sequence</a>, including the * <a href="tables.html#68">optional sequence requirements</a> with the * %exception of @c push_front and @c pop_front. * * In some terminology a %vector can be described as a dynamic * C-style array, it offers fast and efficient access to individual * elements in any order and saves the user from worrying about * memory and size allocation. Subscripting ( @c [] ) access is * also provided as with C-style arrays. / template<typename _Tp, typename _Alloc = std::allocator<_Tp> > class vector : protected _Vector_base<_Tp, _Alloc> { #ifdef _GLIBCXX_CONCEPT_CHECKS // Concept requirements. typedef typename _Alloc::value_type _Alloc_value_type; # if __cplusplus < 201103L __glibcxx_class_requires(_Tp, _SGIAssignableConcept) # endif __glibcxx_class_requires2(_Tp, _Alloc_value_type, _SameTypeConcept) #endif #if __cplusplus >= 201103L static_assert(is_same<typename remove_cv<_Tp>::type, _Tp>::value, "std::vector must have a non-const, non-volatile value_type"); # ifdef __STRICT_ANSI__ static_assert(is_same<typename _Alloc::value_type, _Tp>::value, "std::vector must have the same value_type as its allocator"); # endif #endif typedef _Vector_base<_Tp, _Alloc> _Base; typedef typename _Base::_Tp_alloc_type _Tp_alloc_type; typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Alloc_traits; public: typedef _Tp value_type; typedef typename _Base::pointer pointer; typedef typename _Alloc_traits::const_pointer const_pointer; typedef typename _Alloc_traits::reference reference; typedef typename _Alloc_traits::const_reference const_reference; typedef __gnu_cxx::__normal_iterator<pointer, vector> iterator; typedef __gnu_cxx::__normal_iterator<const_pointer, vector> const_iterator; typedef std::reverse_iterator<const_iterator> const_reverse_iterator; typedef std::reverse_iterator<iterator> reverse_iterator; typedef size_t size_type; typedef ptrdiff_t difference_type; typedef _Alloc allocator_type; protected: using _Base::_M_allocate; using _Base::_M_deallocate; using _Base::_M_impl; using _Base::_M_get_Tp_allocator; public: // [23.2.4.1] construct/copy/destroy // (assign() and get_allocator() are also listed in this section) /* * @brief Creates a %vector with no elements. / vector() #if __cplusplus >= 201103L noexcept(is_nothrow_default_constructible<_Alloc>::value) #endif : _Base() { } /* * @brief Creates a %vector with no elements. * @param __a An allocator object. / explicit vector(const allocator_type& __a) _GLIBCXX_NOEXCEPT : _Base(__a) { } #if __cplusplus >= 201103L /* * @brief Creates a %vector with default constructed elements. * @param __n The number of elements to initially create. * @param __a An allocator. * * This constructor fills the %vector with @a __n default * constructed elements. / explicit vector(size_type __n, const allocator_type& __a = allocator_type()) : _Base(__n, __a) { _M_default_initialize(__n); } /* * @brief Creates a %vector with copies of an exemplar element. * @param __n The number of elements to initially create. * @param __value An element to copy. * @param __a An allocator. * * This constructor fills the %vector with @a __n copies of @a __value. / vector(size_type __n, const value_type& __value, const allocator_type& __a = allocator_type()) : _Base(__n, __a) { _M_fill_initialize(__n, __value); } #else /* * @brief Creates a %vector with copies of an exemplar element. * @param __n The number of elements to initially create. * @param __value An element to copy. * @param __a An allocator. * * This constructor fills the %vector with @a __n copies of @a __value. / explicit vector(size_type __n, const value_type& __value = value_type(), const allocator_type& __a = allocator_type()) : _Base(__n, __a) { _M_fill_initialize(__n, __value); } #endif /* * @brief %Vector copy constructor. * @param __x A %vector of identical element and allocator types. * * All the elements of @a __x are copied, but any unused capacity in * @a __x will not be copied * (i.e. capacity() == size() in the new %vector). * * The newly-created %vector uses a copy of the allocator object used * by @a __x (unless the allocator traits dictate a different object). / vector(const vector& __x) : _Base(__x.size(), _Alloc_traits::_S_select_on_copy(__x._M_get_Tp_allocator())) { this->_M_impl._M_finish = std::__uninitialized_copy_a(__x.begin(), __x.end(), this->_M_impl._M_start, _M_get_Tp_allocator()); } #if __cplusplus >= 201103L /* * @brief %Vector move constructor. * @param __x A %vector of identical element and allocator types. * * The newly-created %vector contains the exact contents of @a __x. * The contents of @a __x are a valid, but unspecified %vector. / vector(vector&& __x) noexcept : _Base(std::move(__x)) { } /// Copy constructor with alternative allocator vector(const vector& __x, const allocator_type& __a) : _Base(__x.size(), __a) { this->_M_impl._M_finish = std::__uninitialized_copy_a(__x.begin(), __x.end(), this->_M_impl._M_start, _M_get_Tp_allocator()); } /// Move constructor with alternative allocator vector(vector&& __rv, const allocator_type& __m) noexcept(_Alloc_traits::_S_always_equal()) : _Base(std::move(__rv), __m) { if (__rv.get_allocator() != __m) { this->_M_impl._M_finish = std::__uninitialized_move_a(__rv.begin(), __rv.end(), this->_M_impl._M_start, _M_get_Tp_allocator()); __rv.clear(); } } /* * @brief Builds a %vector from an initializer list. * @param __l An initializer_list. * @param __a An allocator. * * Create a %vector consisting of copies of the elements in the * initializer_list @a __l. * * This will call the element type's copy constructor N times * (where N is @a __l.size()) and do no memory reallocation. / vector(initializer_list<value_type> __l, const allocator_type& __a = allocator_type()) : _Base(__a) { _M_range_initialize(__l.begin(), __l.end(), random_access_iterator_tag()); } #endif /* * @brief Builds a %vector from a range. * @param __first An input iterator. * @param __last An input iterator. * @param __a An allocator. * * Create a %vector consisting of copies of the elements from * [first,last). * * If the iterators are forward, bidirectional, or * random-access, then this will call the elements' copy * constructor N times (where N is distance(first,last)) and do * no memory reallocation. But if only input iterators are * used, then this will do at most 2N calls to the copy * constructor, and logN memory reallocations. / #if __cplusplus >= 201103L template<typename _InputIterator, typename = std::_RequireInputIter<_InputIterator>> vector(_InputIterator __first, _InputIterator __last, const allocator_type& __a = allocator_type()) : _Base(__a) { _M_initialize_dispatch(__first, __last, __false_type()); } #else template<typename _InputIterator> vector(_InputIterator __first, _InputIterator __last, const allocator_type& __a = allocator_type()) : _Base(__a) { // Check whether it's an integral type. If so, it's not an iterator. typedef typename std::__is_integer<_InputIterator>::__type _Integral; _M_initialize_dispatch(__first, __last, _Integral()); } #endif /* * The dtor only erases the elements, and note that if the * elements themselves are pointers, the pointed-to memory is * not touched in any way. Managing the pointer is the user's * responsibility. / ~vector() _GLIBCXX_NOEXCEPT { std::_Destroy(this->_M_impl._M_start, this->_M_impl._M_finish, _M_get_Tp_allocator()); _GLIBCXX_ASAN_ANNOTATE_BEFORE_DEALLOC; } /* * @brief %Vector assignment operator. * @param __x A %vector of identical element and allocator types. * * All the elements of @a __x are copied, but any unused capacity in * @a __x will not be copied. * * Whether the allocator is copied depends on the allocator traits. / vector& operator=(const vector& __x); #if __cplusplus >= 201103L /* * @brief %Vector move assignment operator. * @param __x A %vector of identical element and allocator types. * * The contents of @a __x are moved into this %vector (without copying, * if the allocators permit it). * Afterwards @a __x is a valid, but unspecified %vector. * * Whether the allocator is moved depends on the allocator traits. / vector& operator=(vector&& __x) noexcept(_Alloc_traits::_S_nothrow_move()) { constexpr bool __move_storage = _Alloc_traits::_S_propagate_on_move_assign() \|\| _Alloc_traits::_S_always_equal(); _M_move_assign(std::move(__x), __bool_constant<__move_storage>()); return this; } /** * @brief %Vector list assignment operator. * @param __l An initializer_list. * * This function fills a %vector with copies of the elements in the * initializer list @a __l. * * Note that the assignment completely changes the %vector and * that the resulting %vector's size is the same as the number * of elements assigned. / vector& operator=(initializer_list<value_type> __l) { this->_M_assign_aux(__l.begin(), __l.end(), random_access_iterator_tag()); return this; } #endif /** * @brief Assigns a given value to a %vector. * @param __n Number of elements to be assigned. * @param __val Value to be assigned. * * This function fills a %vector with @a __n copies of the given * value. Note that the assignment completely changes the * %vector and that the resulting %vector's size is the same as * the number of elements assigned. / void assign(size_type __n, const value_type& __val) { _M_fill_assign(__n, __val); } /* * @brief Assigns a range to a %vector. * @param __first An input iterator. * @param __last An input iterator. * * This function fills a %vector with copies of the elements in the * range [__first,__last). * * Note that the assignment completely changes the %vector and * that the resulting %vector's size is the same as the number * of elements assigned. / #if __cplusplus >= 201103L template<typename _InputIterator, typename = std::_RequireInputIter<_InputIterator>> void assign(_InputIterator __first, _InputIterator __last) { _M_assign_dispatch(__first, __last, __false_type()); } #else template<typename _InputIterator> void assign(_InputIterator __first, _InputIterator __last) { // Check whether it's an integral type. If so, it's not an iterator. typedef typename std::__is_integer<_InputIterator>::__type _Integral; _M_assign_dispatch(__first, __last, _Integral()); } #endif #if __cplusplus >= 201103L /* * @brief Assigns an initializer list to a %vector. * @param __l An initializer_list. * * This function fills a %vector with copies of the elements in the * initializer list @a __l. * * Note that the assignment completely changes the %vector and * that the resulting %vector's size is the same as the number * of elements assigned. / void assign(initializer_list<value_type> __l) { this->_M_assign_aux(__l.begin(), __l.end(), random_access_iterator_tag()); } #endif /// Get a copy of the memory allocation object. using _Base::get_allocator; // iterators /* * Returns a read/write iterator that points to the first * element in the %vector. Iteration is done in ordinary * element order. / iterator begin() _GLIBCXX_NOEXCEPT { return iterator(this->_M_impl._M_start); } /* * Returns a read-only (constant) iterator that points to the * first element in the %vector. Iteration is done in ordinary * element order. / const_iterator begin() const _GLIBCXX_NOEXCEPT { return const_iterator(this->_M_impl._M_start); } /* * Returns a read/write iterator that points one past the last * element in the %vector. Iteration is done in ordinary * element order. / iterator end() _GLIBCXX_NOEXCEPT { return iterator(this->_M_impl._M_finish); } /* * Returns a read-only (constant) iterator that points one past * the last element in the %vector. Iteration is done in * ordinary element order. / const_iterator end() const _GLIBCXX_NOEXCEPT { return const_iterator(this->_M_impl._M_finish); } /* * Returns a read/write reverse iterator that points to the * last element in the %vector. Iteration is done in reverse * element order. / reverse_iterator rbegin() _GLIBCXX_NOEXCEPT { return reverse_iterator(end()); } /* * Returns a read-only (constant) reverse iterator that points * to the last element in the %vector. Iteration is done in * reverse element order. / const_reverse_iterator rbegin() const _GLIBCXX_NOEXCEPT { return const_reverse_iterator(end()); } /* * Returns a read/write reverse iterator that points to one * before the first element in the %vector. Iteration is done * in reverse element order. / reverse_iterator rend() _GLIBCXX_NOEXCEPT { return reverse_iterator(begin()); } /* * Returns a read-only (constant) reverse iterator that points * to one before the first element in the %vector. Iteration * is done in reverse element order. / const_reverse_iterator rend() const _GLIBCXX_NOEXCEPT { return const_reverse_iterator(begin()); } #if __cplusplus >= 201103L /* * Returns a read-only (constant) iterator that points to the * first element in the %vector. Iteration is done in ordinary * element order. / const_iterator cbegin() const noexcept { return const_iterator(this->_M_impl._M_start); } /* * Returns a read-only (constant) iterator that points one past * the last element in the %vector. Iteration is done in * ordinary element order. / const_iterator cend() const noexcept { return const_iterator(this->_M_impl._M_finish); } /* * Returns a read-only (constant) reverse iterator that points * to the last element in the %vector. Iteration is done in * reverse element order. / const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(end()); } /* * Returns a read-only (constant) reverse iterator that points * to one before the first element in the %vector. Iteration * is done in reverse element order. / const_reverse_iterator crend() const noexcept { return const_reverse_iterator(begin()); } #endif // [23.2.4.2] capacity /* Returns the number of elements in the %vector. / size_type size() const _GLIBCXX_NOEXCEPT { return size_type(this->_M_impl._M_finish - this->_M_impl._M_start); } /* Returns the size() of the largest possible %vector. / size_type max_size() const _GLIBCXX_NOEXCEPT { return _Alloc_traits::max_size(_M_get_Tp_allocator()); } #if __cplusplus >= 201103L /* * @brief Resizes the %vector to the specified number of elements. * @param __new_size Number of elements the %vector should contain. * * This function will %resize the %vector to the specified * number of elements. If the number is smaller than the * %vector's current size the %vector is truncated, otherwise * default constructed elements are appended. / void resize(size_type __new_size) { if (__new_size > size()) _M_default_append(__new_size - size()); else if (__new_size < size()) _M_erase_at_end(this->_M_impl._M_start + __new_size); } /* * @brief Resizes the %vector to the specified number of elements. * @param __new_size Number of elements the %vector should contain. * @param __x Data with which new elements should be populated. * * This function will %resize the %vector to the specified * number of elements. If the number is smaller than the * %vector's current size the %vector is truncated, otherwise * the %vector is extended and new elements are populated with * given data. / void resize(size_type __new_size, const value_type& __x) { if (__new_size > size()) _M_fill_insert(end(), __new_size - size(), __x); else if (__new_size < size()) _M_erase_at_end(this->_M_impl._M_start + __new_size); } #else /* * @brief Resizes the %vector to the specified number of elements. * @param __new_size Number of elements the %vector should contain. * @param __x Data with which new elements should be populated. * * This function will %resize the %vector to the specified * number of elements. If the number is smaller than the * %vector's current size the %vector is truncated, otherwise * the %vector is extended and new elements are populated with * given data. / void resize(size_type __new_size, value_type __x = value_type()) { if (__new_size > size()) _M_fill_insert(end(), __new_size - size(), __x); else if (__new_size < size()) _M_erase_at_end(this->_M_impl._M_start + __new_size); } #endif #if __cplusplus >= 201103L /* A non-binding request to reduce capacity() to size(). / void shrink_to_fit() { _M_shrink_to_fit(); } #endif /* * Returns the total number of elements that the %vector can * hold before needing to allocate more memory. / size_type capacity() const _GLIBCXX_NOEXCEPT { return size_type(this->_M_impl._M_end_of_storage - this->_M_impl._M_start); } /* * Returns true if the %vector is empty. (Thus begin() would * equal end().) / bool empty() const _GLIBCXX_NOEXCEPT { return begin() == end(); } /* * @brief Attempt to preallocate enough memory for specified number of * elements. * @param __n Number of elements required. * @throw std::length_error If @a n exceeds @c max_size(). * * This function attempts to reserve enough memory for the * %vector to hold the specified number of elements. If the * number requested is more than max_size(), length_error is * thrown. * * The advantage of this function is that if optimal code is a * necessity and the user can determine the number of elements * that will be required, the user can reserve the memory in * %advance, and thus prevent a possible reallocation of memory * and copying of %vector data. / void reserve(size_type __n); // element access /* * @brief Subscript access to the data contained in the %vector. * @param __n The index of the element for which data should be * accessed. * @return Read/write reference to data. * * This operator allows for easy, array-style, data access. * Note that data access with this operator is unchecked and * out_of_range lookups are not defined. (For checked lookups * see at().) / reference operator[](size_type __n) _GLIBCXX_NOEXCEPT { __glibcxx_requires_subscript(__n); return (this->_M_impl._M_start + __n); } /** * @brief Subscript access to the data contained in the %vector. * @param __n The index of the element for which data should be * accessed. * @return Read-only (constant) reference to data. * * This operator allows for easy, array-style, data access. * Note that data access with this operator is unchecked and * out_of_range lookups are not defined. (For checked lookups * see at().) / const_reference operator[](size_type __n) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_subscript(__n); return (this->_M_impl._M_start + __n); } protected: /// Safety check used only from at(). void _M_range_check(size_type __n) const { if (__n >= this->size()) __throw_out_of_range_fmt(__N("vector::_M_range_check: __n " "(which is %zu) >= this->size() " "(which is %zu)"), __n, this->size()); } public: /** * @brief Provides access to the data contained in the %vector. * @param __n The index of the element for which data should be * accessed. * @return Read/write reference to data. * @throw std::out_of_range If @a __n is an invalid index. * * This function provides for safer data access. The parameter * is first checked that it is in the range of the vector. The * function throws out_of_range if the check fails. / reference at(size_type __n) { _M_range_check(__n); return (this)[__n]; } /** * @brief Provides access to the data contained in the %vector. * @param __n The index of the element for which data should be * accessed. * @return Read-only (constant) reference to data. * @throw std::out_of_range If @a __n is an invalid index. * * This function provides for safer data access. The parameter * is first checked that it is in the range of the vector. The * function throws out_of_range if the check fails. / const_reference at(size_type __n) const { _M_range_check(__n); return (this)[__n]; } /** * Returns a read/write reference to the data at the first * element of the %vector. / reference front() _GLIBCXX_NOEXCEPT { __glibcxx_requires_nonempty(); return begin(); } /** * Returns a read-only (constant) reference to the data at the first * element of the %vector. / const_reference front() const _GLIBCXX_NOEXCEPT { __glibcxx_requires_nonempty(); return begin(); } /** * Returns a read/write reference to the data at the last * element of the %vector. / reference back() _GLIBCXX_NOEXCEPT { __glibcxx_requires_nonempty(); return (end() - 1); } /** * Returns a read-only (constant) reference to the data at the * last element of the %vector. / const_reference back() const _GLIBCXX_NOEXCEPT { __glibcxx_requires_nonempty(); return (end() - 1); } // _GLIBCXX_RESOLVE_LIB_DEFECTS // DR 464. Suggestion for new member functions in standard containers. // data access /** * Returns a pointer such that [data(), data() + size()) is a valid * range. For a non-empty %vector, data() == &front(). / _Tp data() _GLIBCXX_NOEXCEPT { return _M_data_ptr(this->_M_impl._M_start); } const _Tp* data() const _GLIBCXX_NOEXCEPT { return _M_data_ptr(this->_M_impl._M_start); } // [23.2.4.3] modifiers /** * @brief Add data to the end of the %vector. * @param __x Data to be added. * * This is a typical stack operation. The function creates an * element at the end of the %vector and assigns the given data * to it. Due to the nature of a %vector this operation can be * done in constant time if the %vector has preallocated space * available. / void push_back(const value_type& __x) { if (this->_M_impl._M_finish != this->_M_impl._M_end_of_storage) { _GLIBCXX_ASAN_ANNOTATE_GROW(1); _Alloc_traits::construct(this->_M_impl, this->_M_impl._M_finish, __x); ++this->_M_impl._M_finish; _GLIBCXX_ASAN_ANNOTATE_GREW(1); } else _M_realloc_insert(end(), __x); } #if __cplusplus >= 201103L void push_back(value_type&& __x) { emplace_back(std::move(__x)); } template<typename... _Args> #if __cplusplus > 201402L reference #else void #endif emplace_back(_Args&&... __args); #endif /* * @brief Removes last element. * * This is a typical stack operation. It shrinks the %vector by one. * * Note that no data is returned, and if the last element's * data is needed, it should be retrieved before pop_back() is * called. / void pop_back() _GLIBCXX_NOEXCEPT { __glibcxx_requires_nonempty(); --this->_M_impl._M_finish; _Alloc_traits::destroy(this->_M_impl, this->_M_impl._M_finish); _GLIBCXX_ASAN_ANNOTATE_SHRINK(1); } #if __cplusplus >= 201103L /* * @brief Inserts an object in %vector before specified iterator. * @param __position A const_iterator into the %vector. * @param __args Arguments. * @return An iterator that points to the inserted data. * * This function will insert an object of type T constructed * with T(std::forward<Args>(args)...) before the specified location. * Note that this kind of operation could be expensive for a %vector * and if it is frequently used the user should consider using * std::list. / template<typename... _Args> iterator emplace(const_iterator __position, _Args&&... __args) { return _M_emplace_aux(__position, std::forward<_Args>(__args)...); } /* * @brief Inserts given value into %vector before specified iterator. * @param __position A const_iterator into the %vector. * @param __x Data to be inserted. * @return An iterator that points to the inserted data. * * This function will insert a copy of the given value before * the specified location. Note that this kind of operation * could be expensive for a %vector and if it is frequently * used the user should consider using std::list. / iterator insert(const_iterator __position, const value_type& __x); #else /* * @brief Inserts given value into %vector before specified iterator. * @param __position An iterator into the %vector. * @param __x Data to be inserted. * @return An iterator that points to the inserted data. * * This function will insert a copy of the given value before * the specified location. Note that this kind of operation * could be expensive for a %vector and if it is frequently * used the user should consider using std::list. / iterator insert(iterator __position, const value_type& __x); #endif #if __cplusplus >= 201103L /* * @brief Inserts given rvalue into %vector before specified iterator. * @param __position A const_iterator into the %vector. * @param __x Data to be inserted. * @return An iterator that points to the inserted data. * * This function will insert a copy of the given rvalue before * the specified location. Note that this kind of operation * could be expensive for a %vector and if it is frequently * used the user should consider using std::list. / iterator insert(const_iterator __position, value_type&& __x) { return _M_insert_rval(__position, std::move(__x)); } /* * @brief Inserts an initializer_list into the %vector. * @param __position An iterator into the %vector. * @param __l An initializer_list. * * This function will insert copies of the data in the * initializer_list @a l into the %vector before the location * specified by @a position. * * Note that this kind of operation could be expensive for a * %vector and if it is frequently used the user should * consider using std::list. / iterator insert(const_iterator __position, initializer_list<value_type> __l) { auto __offset = __position - cbegin(); _M_range_insert(begin() + __offset, __l.begin(), __l.end(), std::random_access_iterator_tag()); return begin() + __offset; } #endif #if __cplusplus >= 201103L /* * @brief Inserts a number of copies of given data into the %vector. * @param __position A const_iterator into the %vector. * @param __n Number of elements to be inserted. * @param __x Data to be inserted. * @return An iterator that points to the inserted data. * * This function will insert a specified number of copies of * the given data before the location specified by @a position. * * Note that this kind of operation could be expensive for a * %vector and if it is frequently used the user should * consider using std::list. / iterator insert(const_iterator __position, size_type __n, const value_type& __x) { difference_type __offset = __position - cbegin(); _M_fill_insert(begin() + __offset, __n, __x); return begin() + __offset; } #else /* * @brief Inserts a number of copies of given data into the %vector. * @param __position An iterator into the %vector. * @param __n Number of elements to be inserted. * @param __x Data to be inserted. * * This function will insert a specified number of copies of * the given data before the location specified by @a position. * * Note that this kind of operation could be expensive for a * %vector and if it is frequently used the user should * consider using std::list. / void insert(iterator __position, size_type __n, const value_type& __x) { _M_fill_insert(__position, __n, __x); } #endif #if __cplusplus >= 201103L /* * @brief Inserts a range into the %vector. * @param __position A const_iterator into the %vector. * @param __first An input iterator. * @param __last An input iterator. * @return An iterator that points to the inserted data. * * This function will insert copies of the data in the range * [__first,__last) into the %vector before the location specified * by @a pos. * * Note that this kind of operation could be expensive for a * %vector and if it is frequently used the user should * consider using std::list. / template<typename _InputIterator, typename = std::_RequireInputIter<_InputIterator>> iterator insert(const_iterator __position, _InputIterator __first, _InputIterator __last) { difference_type __offset = __position - cbegin(); _M_insert_dispatch(begin() + __offset, __first, __last, __false_type()); return begin() + __offset; } #else /* * @brief Inserts a range into the %vector. * @param __position An iterator into the %vector. * @param __first An input iterator. * @param __last An input iterator. * * This function will insert copies of the data in the range * [__first,__last) into the %vector before the location specified * by @a pos. * * Note that this kind of operation could be expensive for a * %vector and if it is frequently used the user should * consider using std::list. / template<typename _InputIterator> void insert(iterator __position, _InputIterator __first, _InputIterator __last) { // Check whether it's an integral type. If so, it's not an iterator. typedef typename std::__is_integer<_InputIterator>::__type _Integral; _M_insert_dispatch(__position, __first, __last, _Integral()); } #endif /* * @brief Remove element at given position. * @param __position Iterator pointing to element to be erased. * @return An iterator pointing to the next element (or end()). * * This function will erase the element at the given position and thus * shorten the %vector by one. * * Note This operation could be expensive and if it is * frequently used the user should consider using std::list. * The user is also cautioned that this function only erases * the element, and that if the element is itself a pointer, * the pointed-to memory is not touched in any way. Managing * the pointer is the user's responsibility. / iterator #if __cplusplus >= 201103L erase(const_iterator __position) { return _M_erase(begin() + (__position - cbegin())); } #else erase(iterator __position) { return _M_erase(__position); } #endif /* * @brief Remove a range of elements. * @param __first Iterator pointing to the first element to be erased. * @param __last Iterator pointing to one past the last element to be * erased. * @return An iterator pointing to the element pointed to by @a __last * prior to erasing (or end()). * * This function will erase the elements in the range * [__first,__last) and shorten the %vector accordingly. * * Note This operation could be expensive and if it is * frequently used the user should consider using std::list. * The user is also cautioned that this function only erases * the elements, and that if the elements themselves are * pointers, the pointed-to memory is not touched in any way. * Managing the pointer is the user's responsibility. / iterator #if __cplusplus >= 201103L erase(const_iterator __first, const_iterator __last) { const auto __beg = begin(); const auto __cbeg = cbegin(); return _M_erase(__beg + (__first - __cbeg), __beg + (__last - __cbeg)); } #else erase(iterator __first, iterator __last) { return _M_erase(__first, __last); } #endif /* * @brief Swaps data with another %vector. * @param __x A %vector of the same element and allocator types. * * This exchanges the elements between two vectors in constant time. * (Three pointers, so it should be quite fast.) * Note that the global std::swap() function is specialized such that * std::swap(v1,v2) will feed to this function. * * Whether the allocators are swapped depends on the allocator traits. / void swap(vector& __x) _GLIBCXX_NOEXCEPT { #if __cplusplus >= 201103L __glibcxx_assert(_Alloc_traits::propagate_on_container_swap::value \|\| _M_get_Tp_allocator() == __x._M_get_Tp_allocator()); #endif this->_M_impl._M_swap_data(__x._M_impl); _Alloc_traits::_S_on_swap(_M_get_Tp_allocator(), __x._M_get_Tp_allocator()); } /* * Erases all the elements. Note that this function only erases the * elements, and that if the elements themselves are pointers, the * pointed-to memory is not touched in any way. Managing the pointer is * the user's responsibility. / void clear() _GLIBCXX_NOEXCEPT { _M_erase_at_end(this->_M_impl._M_start); } protected: /* * Memory expansion handler. Uses the member allocation function to * obtain @a n bytes of memory, and then copies [first,last) into it. / template<typename _ForwardIterator> pointer _M_allocate_and_copy(size_type __n, _ForwardIterator __first, _ForwardIterator __last) { pointer __result = this->_M_allocate(__n); __try { std::__uninitialized_copy_a(__first, __last, __result, _M_get_Tp_allocator()); return __result; } __catch(...) { _M_deallocate(__result, __n); __throw_exception_again; } } // Internal constructor functions follow. // Called by the range constructor to implement [23.1.1]/9 // _GLIBCXX_RESOLVE_LIB_DEFECTS // 438. Ambiguity in the "do the right thing" clause template<typename _Integer> void _M_initialize_dispatch(_Integer __n, _Integer __value, __true_type) { this->_M_impl._M_start = _M_allocate(static_cast<size_type>(__n)); this->_M_impl._M_end_of_storage = this->_M_impl._M_start + static_cast<size_type>(__n); _M_fill_initialize(static_cast<size_type>(__n), __value); } // Called by the range constructor to implement [23.1.1]/9 template<typename _InputIterator> void _M_initialize_dispatch(_InputIterator __first, _InputIterator __last, __false_type) { typedef typename std::iterator_traits<_InputIterator>:: iterator_category _IterCategory; _M_range_initialize(__first, __last, _IterCategory()); } // Called by the second initialize_dispatch above template<typename _InputIterator> void _M_range_initialize(_InputIterator __first, _InputIterator __last, std::input_iterator_tag) { __try { for (; __first != __last; ++__first) #if __cplusplus >= 201103L emplace_back(__first); #else push_back(__first); #endif } __catch(...) { clear(); __throw_exception_again; } } // Called by the second initialize_dispatch above template<typename _ForwardIterator> void _M_range_initialize(_ForwardIterator __first, _ForwardIterator __last, std::forward_iterator_tag) { const size_type __n = std::distance(__first, __last); this->_M_impl._M_start = this->_M_allocate(__n); this->_M_impl._M_end_of_storage = this->_M_impl._M_start + __n; this->_M_impl._M_finish = std::__uninitialized_copy_a(__first, __last, this->_M_impl._M_start, _M_get_Tp_allocator()); } // Called by the first initialize_dispatch above and by the // vector(n,value,a) constructor. void _M_fill_initialize(size_type __n, const value_type& __value) { this->_M_impl._M_finish = std::__uninitialized_fill_n_a(this->_M_impl._M_start, __n, __value, _M_get_Tp_allocator()); } #if __cplusplus >= 201103L // Called by the vector(n) constructor. void _M_default_initialize(size_type __n) { this->_M_impl._M_finish = std::__uninitialized_default_n_a(this->_M_impl._M_start, __n, _M_get_Tp_allocator()); } #endif // Internal assign functions follow. The _aux functions do the actual // assignment work for the range versions. // Called by the range assign to implement [23.1.1]/9 // _GLIBCXX_RESOLVE_LIB_DEFECTS // 438. Ambiguity in the "do the right thing" clause template<typename _Integer> void _M_assign_dispatch(_Integer __n, _Integer __val, __true_type) { _M_fill_assign(__n, __val); } // Called by the range assign to implement [23.1.1]/9 template<typename _InputIterator> void _M_assign_dispatch(_InputIterator __first, _InputIterator __last, __false_type) { _M_assign_aux(__first, __last, std::__iterator_category(__first)); } // Called by the second assign_dispatch above template<typename _InputIterator> void _M_assign_aux(_InputIterator __first, _InputIterator __last, std::input_iterator_tag); // Called by the second assign_dispatch above template<typename _ForwardIterator> void _M_assign_aux(_ForwardIterator __first, _ForwardIterator __last, std::forward_iterator_tag); // Called by assign(n,t), and the range assign when it turns out // to be the same thing. void _M_fill_assign(size_type __n, const value_type& __val); // Internal insert functions follow. // Called by the range insert to implement [23.1.1]/9 // _GLIBCXX_RESOLVE_LIB_DEFECTS // 438. Ambiguity in the "do the right thing" clause template<typename _Integer> void _M_insert_dispatch(iterator __pos, _Integer __n, _Integer __val, __true_type) { _M_fill_insert(__pos, __n, __val); } // Called by the range insert to implement [23.1.1]/9 template<typename _InputIterator> void _M_insert_dispatch(iterator __pos, _InputIterator __first, _InputIterator __last, __false_type) { _M_range_insert(__pos, __first, __last, std::__iterator_category(__first)); } // Called by the second insert_dispatch above template<typename _InputIterator> void _M_range_insert(iterator __pos, _InputIterator __first, _InputIterator __last, std::input_iterator_tag); // Called by the second insert_dispatch above template<typename _ForwardIterator> void _M_range_insert(iterator __pos, _ForwardIterator __first, _ForwardIterator __last, std::forward_iterator_tag); // Called by insert(p,n,x), and the range insert when it turns out to be // the same thing. void _M_fill_insert(iterator __pos, size_type __n, const value_type& __x); #if __cplusplus >= 201103L // Called by resize(n). void _M_default_append(size_type __n); bool _M_shrink_to_fit(); #endif #if __cplusplus < 201103L // Called by insert(p,x) void _M_insert_aux(iterator __position, const value_type& __x); void _M_realloc_insert(iterator __position, const value_type& __x); #else // A value_type object constructed with _Alloc_traits::construct() // and destroyed with _Alloc_traits::destroy(). struct _Temporary_value { template<typename... _Args> explicit _Temporary_value(vector* __vec, _Args&&... __args) : _M_this(__vec) { _Alloc_traits::construct(_M_this->_M_impl, _M_ptr(), std::forward<_Args>(__args)...); } ~_Temporary_value() { _Alloc_traits::destroy(_M_this->_M_impl, _M_ptr()); } value_type& _M_val() { return _M_ptr(); } private: _Tp _M_ptr() { return reinterpret_cast<_Tp>(&__buf); } vector _M_this; typename aligned_storage<sizeof(_Tp), alignof(_Tp)>::type __buf; }; // Called by insert(p,x) and other functions when insertion needs to // reallocate or move existing elements. _Arg is either _Tp& or _Tp. template<typename _Arg> void _M_insert_aux(iterator __position, _Arg&& __arg); template<typename... _Args> void _M_realloc_insert(iterator __position, _Args&&... __args); // Either move-construct at the end, or forward to _M_insert_aux. iterator _M_insert_rval(const_iterator __position, value_type&& __v); // Try to emplace at the end, otherwise forward to _M_insert_aux. template<typename... _Args> iterator _M_emplace_aux(const_iterator __position, _Args&&... __args); // Emplacing an rvalue of the correct type can use _M_insert_rval. iterator _M_emplace_aux(const_iterator __position, value_type&& __v) { return _M_insert_rval(__position, std::move(__v)); } #endif // Called by _M_fill_insert, _M_insert_aux etc. size_type _M_check_len(size_type __n, const char* __s) const { if (max_size() - size() < __n) __throw_length_error(__N(__s)); const size_type __len = size() + std::max(size(), __n); return (__len < size() \|\| __len > max_size()) ? max_size() : __len; } // Internal erase functions follow. // Called by erase(q1,q2), clear(), resize(), _M_fill_assign, // _M_assign_aux. void _M_erase_at_end(pointer __pos) _GLIBCXX_NOEXCEPT { if (size_type __n = this->_M_impl._M_finish - __pos) { std::_Destroy(__pos, this->_M_impl._M_finish, _M_get_Tp_allocator()); this->_M_impl._M_finish = __pos; _GLIBCXX_ASAN_ANNOTATE_SHRINK(__n); } } iterator _M_erase(iterator __position); iterator _M_erase(iterator __first, iterator __last); #if __cplusplus >= 201103L private: // Constant-time move assignment when source object's memory can be // moved, either because the source's allocator will move too // or because the allocators are equal. void _M_move_assign(vector&& __x, std::true_type) noexcept { vector __tmp(get_allocator()); this->_M_impl._M_swap_data(__tmp._M_impl); this->_M_impl._M_swap_data(__x._M_impl); std::__alloc_on_move(_M_get_Tp_allocator(), __x._M_get_Tp_allocator()); } // Do move assignment when it might not be possible to move source // object's memory, resulting in a linear-time operation. void _M_move_assign(vector&& __x, std::false_type) { if (__x._M_get_Tp_allocator() == this->_M_get_Tp_allocator()) _M_move_assign(std::move(__x), std::true_type()); else { // The rvalue's allocator cannot be moved and is not equal, // so we need to individually move each element. this->assign(std::__make_move_if_noexcept_iterator(__x.begin()), std::__make_move_if_noexcept_iterator(__x.end())); __x.clear(); } } #endif template<typename _Up> _Up* _M_data_ptr(_Up* __ptr) const _GLIBCXX_NOEXCEPT { return __ptr; } #if __cplusplus >= 201103L template<typename _Ptr> typename std::pointer_traits<_Ptr>::element_type* _M_data_ptr(_Ptr __ptr) const { return empty() ? nullptr : std::__to_address(__ptr); } #else template<typename _Up> _Up* _M_data_ptr(_Up* __ptr) _GLIBCXX_NOEXCEPT { return __ptr; } template<typename _Ptr> value_type* _M_data_ptr(_Ptr __ptr) { return empty() ? (value_type)0 : __ptr.operator->(); } template<typename _Ptr> const value_type _M_data_ptr(_Ptr __ptr) const { return empty() ? (const value_type)0 : __ptr.operator->(); } #endif }; #if __cpp_deduction_guides >= 201606 template<typename _InputIterator, typename _ValT = typename iterator_traits<_InputIterator>::value_type, typename _Allocator = allocator<_ValT>, typename = _RequireInputIter<_InputIterator>, typename = _RequireAllocator<_Allocator>> vector(_InputIterator, _InputIterator, _Allocator = _Allocator()) -> vector<_ValT, _Allocator>; #endif /* * @brief Vector equality comparison. * @param __x A %vector. * @param __y A %vector of the same type as @a __x. * @return True iff the size and elements of the vectors are equal. * * This is an equivalence relation. It is linear in the size of the * vectors. Vectors are considered equivalent if their sizes are equal, * and if corresponding elements compare equal. / template<typename _Tp, typename _Alloc> inline bool operator==(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y) { return (__x.size() == __y.size() && std::equal(__x.begin(), __x.end(), __y.begin())); } /* * @brief Vector ordering relation. * @param __x A %vector. * @param __y A %vector of the same type as @a __x. * @return True iff @a __x is lexicographically less than @a __y. * * This is a total ordering relation. It is linear in the size of the * vectors. The elements must be comparable with @c <. * * See std::lexicographical_compare() for how the determination is made. / template<typename _Tp, typename _Alloc> inline bool operator<(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y) { return std::lexicographical_compare(__x.begin(), __x.end(), __y.begin(), __y.end()); } /// Based on operator== template<typename _Tp, typename _Alloc> inline bool operator!=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y) { return !(__x == __y); } /// Based on operator< template<typename _Tp, typename _Alloc> inline bool operator>(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y) { return __y < __x; } /// Based on operator< template<typename _Tp, typename _Alloc> inline bool operator<=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y) { return !(__y < __x); } /// Based on operator< template<typename _Tp, typename _Alloc> inline bool operator>=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y) { return !(__x < __y); } /// See std::vector::swap(). template<typename _Tp, typename _Alloc> inline void swap(vector<_Tp, _Alloc>& __x, vector<_Tp, _Alloc>& __y) _GLIBCXX_NOEXCEPT_IF(noexcept(__x.swap(__y))) { __x.swap(__y); } _GLIBCXX_END_NAMESPACE_CONTAINER _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif / _STL_VECTOR_H */ Back

Edit File : stl_vector.h | Size : 59.12 KB

// Vector implementation -*- C++ -*-

// Copyright (C) 2001-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/*
 *
 * Copyright (c) 1994
 * Hewlett-Packard Company
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Hewlett-Packard Company makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 *
 * Copyright (c) 1996
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this  software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 */

/** @file bits/stl_vector.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{vector}
 */

#ifndef _STL_VECTOR_H
#define _STL_VECTOR_H 1

#include <bits/stl_iterator_base_funcs.h>
#include <bits/functexcept.h>
#include <bits/concept_check.h>
#if __cplusplus >= 201103L
#include <initializer_list>
#endif

#include <debug/assertions.h>

#if _GLIBCXX_SANITIZE_STD_ALLOCATOR && _GLIBCXX_SANITIZE_VECTOR
extern "C" void
__sanitizer_annotate_contiguous_container(const void*, const void*,
					  const void*, const void*);
#endif

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
_GLIBCXX_BEGIN_NAMESPACE_CONTAINER

/// See bits/stl_deque.h's _Deque_base for an explanation.
  template<typename _Tp, typename _Alloc>
    struct _Vector_base
    {
      typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
	rebind<_Tp>::other _Tp_alloc_type;
      typedef typename __gnu_cxx::__alloc_traits<_Tp_alloc_type>::pointer
       	pointer;

struct _Vector_impl
      : public _Tp_alloc_type
      {
	pointer _M_start;
	pointer _M_finish;
	pointer _M_end_of_storage;

_Vector_impl()
	: _Tp_alloc_type(), _M_start(), _M_finish(), _M_end_of_storage()
	{ }

_Vector_impl(_Tp_alloc_type const& __a) _GLIBCXX_NOEXCEPT
	: _Tp_alloc_type(__a), _M_start(), _M_finish(), _M_end_of_storage()
	{ }

#if __cplusplus >= 201103L
	_Vector_impl(_Tp_alloc_type&& __a) noexcept
	: _Tp_alloc_type(std::move(__a)),
	  _M_start(), _M_finish(), _M_end_of_storage()
	{ }
#endif

void _M_swap_data(_Vector_impl& __x) _GLIBCXX_NOEXCEPT
	{
	  std::swap(_M_start, __x._M_start);
	  std::swap(_M_finish, __x._M_finish);
	  std::swap(_M_end_of_storage, __x._M_end_of_storage);
	}

#if _GLIBCXX_SANITIZE_STD_ALLOCATOR && _GLIBCXX_SANITIZE_VECTOR
	template<typename = _Tp_alloc_type>
	  struct _Asan
	  {
	    typedef typename __gnu_cxx::__alloc_traits<_Tp_alloc_type>
	      ::size_type size_type;

static void _S_shrink(_Vector_impl&, size_type) { }
	    static void _S_on_dealloc(_Vector_impl&) { }

typedef _Vector_impl& _Reinit;

struct _Grow
	    {
	      _Grow(_Vector_impl&, size_type) { }
	      void _M_grew(size_type) { }
	    };
	  };

// Enable ASan annotations for memory obtained from std::allocator.
	template<typename _Up>
	  struct _Asan<allocator<_Up> >
	  {
	    typedef typename __gnu_cxx::__alloc_traits<_Tp_alloc_type>
	      ::size_type size_type;

// Adjust ASan annotation for [_M_start, _M_end_of_storage) to
	    // mark end of valid region as __curr instead of __prev.
	    static void
	    _S_adjust(_Vector_impl& __impl, pointer __prev, pointer __curr)
	    {
	      __sanitizer_annotate_contiguous_container(__impl._M_start,
		  __impl._M_end_of_storage, __prev, __curr);
	    }

static void
	    _S_grow(_Vector_impl& __impl, size_type __n)
	    { _S_adjust(__impl, __impl._M_finish, __impl._M_finish + __n); }

static void
	    _S_shrink(_Vector_impl& __impl, size_type __n)
	    { _S_adjust(__impl, __impl._M_finish + __n, __impl._M_finish); }

static void
	    _S_on_dealloc(_Vector_impl& __impl)
	    {
	      if (__impl._M_start)
		_S_adjust(__impl, __impl._M_finish, __impl._M_end_of_storage);
	    }

// Used on reallocation to tell ASan unused capacity is invalid.
	    struct _Reinit
	    {
	      explicit _Reinit(_Vector_impl& __impl) : _M_impl(__impl)
	      {
		// Mark unused capacity as valid again before deallocating it.
		_S_on_dealloc(_M_impl);
	      }

~_Reinit()
	      {
		// Mark unused capacity as invalid after reallocation.
		if (_M_impl._M_start)
		  _S_adjust(_M_impl, _M_impl._M_end_of_storage,
			    _M_impl._M_finish);
	      }

_Vector_impl& _M_impl;

#if __cplusplus >= 201103L
	      _Reinit(const _Reinit&) = delete;
	      _Reinit& operator=(const _Reinit&) = delete;
#endif
	    };

// Tell ASan when unused capacity is initialized to be valid.
	    struct _Grow
	    {
	      _Grow(_Vector_impl& __impl, size_type __n)
	      : _M_impl(__impl), _M_n(__n)
	      { _S_grow(_M_impl, __n); }

~_Grow() { if (_M_n) _S_shrink(_M_impl, _M_n); }

void _M_grew(size_type __n) { _M_n -= __n; }

#if __cplusplus >= 201103L
	      _Grow(const _Grow&) = delete;
	      _Grow& operator=(const _Grow&) = delete;
#endif
	    private:
	      _Vector_impl& _M_impl;
	      size_type _M_n;
	    };
	  };

#define _GLIBCXX_ASAN_ANNOTATE_REINIT \
  typename _Base::_Vector_impl::template _Asan<>::_Reinit const \
	__attribute__((__unused__)) __reinit_guard(this->_M_impl)
#define _GLIBCXX_ASAN_ANNOTATE_GROW(n) \
  typename _Base::_Vector_impl::template _Asan<>::_Grow \
	__attribute__((__unused__)) __grow_guard(this->_M_impl, (n))
#define _GLIBCXX_ASAN_ANNOTATE_GREW(n) __grow_guard._M_grew(n)
#define _GLIBCXX_ASAN_ANNOTATE_SHRINK(n) \
  _Base::_Vector_impl::template _Asan<>::_S_shrink(this->_M_impl, n)
#define _GLIBCXX_ASAN_ANNOTATE_BEFORE_DEALLOC \
  _Base::_Vector_impl::template _Asan<>::_S_on_dealloc(this->_M_impl)
#else // ! (_GLIBCXX_SANITIZE_STD_ALLOCATOR && _GLIBCXX_SANITIZE_VECTOR)
#define _GLIBCXX_ASAN_ANNOTATE_REINIT
#define _GLIBCXX_ASAN_ANNOTATE_GROW(n)
#define _GLIBCXX_ASAN_ANNOTATE_GREW(n)
#define _GLIBCXX_ASAN_ANNOTATE_SHRINK(n)
#define _GLIBCXX_ASAN_ANNOTATE_BEFORE_DEALLOC
#endif // _GLIBCXX_SANITIZE_STD_ALLOCATOR && _GLIBCXX_SANITIZE_VECTOR
      };

public:
      typedef _Alloc allocator_type;

_Tp_alloc_type&
      _M_get_Tp_allocator() _GLIBCXX_NOEXCEPT
      { return *static_cast<_Tp_alloc_type*>(&this->_M_impl); }

const _Tp_alloc_type&
      _M_get_Tp_allocator() const _GLIBCXX_NOEXCEPT
      { return *static_cast<const _Tp_alloc_type*>(&this->_M_impl); }

allocator_type
      get_allocator() const _GLIBCXX_NOEXCEPT
      { return allocator_type(_M_get_Tp_allocator()); }

_Vector_base()
      : _M_impl() { }

_Vector_base(const allocator_type& __a) _GLIBCXX_NOEXCEPT
      : _M_impl(__a) { }

_Vector_base(size_t __n)
      : _M_impl()
      { _M_create_storage(__n); }

_Vector_base(size_t __n, const allocator_type& __a)
      : _M_impl(__a)
      { _M_create_storage(__n); }

#if __cplusplus >= 201103L
      _Vector_base(_Tp_alloc_type&& __a) noexcept
      : _M_impl(std::move(__a)) { }

_Vector_base(_Vector_base&& __x) noexcept
      : _M_impl(std::move(__x._M_get_Tp_allocator()))
      { this->_M_impl._M_swap_data(__x._M_impl); }

_Vector_base(_Vector_base&& __x, const allocator_type& __a)
      : _M_impl(__a)
      {
	if (__x.get_allocator() == __a)
	  this->_M_impl._M_swap_data(__x._M_impl);
	else
	  {
	    size_t __n = __x._M_impl._M_finish - __x._M_impl._M_start;
	    _M_create_storage(__n);
	  }
      }
#endif

~_Vector_base() _GLIBCXX_NOEXCEPT
      {
	_M_deallocate(_M_impl._M_start,
		      _M_impl._M_end_of_storage - _M_impl._M_start);
      }

public:
      _Vector_impl _M_impl;

pointer
      _M_allocate(size_t __n)
      {
	typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Tr;
	return __n != 0 ? _Tr::allocate(_M_impl, __n) : pointer();
      }

void
      _M_deallocate(pointer __p, size_t __n)
      {
	typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Tr;
	if (__p)
	  _Tr::deallocate(_M_impl, __p, __n);
      }

private:
      void
      _M_create_storage(size_t __n)
      {
	this->_M_impl._M_start = this->_M_allocate(__n);
	this->_M_impl._M_finish = this->_M_impl._M_start;
	this->_M_impl._M_end_of_storage = this->_M_impl._M_start + __n;
      }
    };

/**
   *  @brief A standard container which offers fixed time access to
   *  individual elements in any order.
   *
   *  @ingroup sequences
   *
   *  @tparam _Tp  Type of element.
   *  @tparam _Alloc  Allocator type, defaults to allocator<_Tp>.
   *
   *  Meets the requirements of a <a href="tables.html#65">container</a>, a
   *  <a href="tables.html#66">reversible container</a>, and a
   *  <a href="tables.html#67">sequence</a>, including the
   *  <a href="tables.html#68">optional sequence requirements</a> with the
   *  %exception of @c push_front and @c pop_front.
   *
   *  In some terminology a %vector can be described as a dynamic
   *  C-style array, it offers fast and efficient access to individual
   *  elements in any order and saves the user from worrying about
   *  memory and size allocation.  Subscripting ( @c [] ) access is
   *  also provided as with C-style arrays.
  */
  template<typename _Tp, typename _Alloc = std::allocator<_Tp> >
    class vector : protected _Vector_base<_Tp, _Alloc>
    {
#ifdef _GLIBCXX_CONCEPT_CHECKS
      // Concept requirements.
      typedef typename _Alloc::value_type		_Alloc_value_type;
# if __cplusplus < 201103L
      __glibcxx_class_requires(_Tp, _SGIAssignableConcept)
# endif
      __glibcxx_class_requires2(_Tp, _Alloc_value_type, _SameTypeConcept)
#endif

#if __cplusplus >= 201103L
      static_assert(is_same<typename remove_cv<_Tp>::type, _Tp>::value,
	  "std::vector must have a non-const, non-volatile value_type");
# ifdef __STRICT_ANSI__
      static_assert(is_same<typename _Alloc::value_type, _Tp>::value,
	  "std::vector must have the same value_type as its allocator");
# endif
#endif

typedef _Vector_base<_Tp, _Alloc>			_Base;
      typedef typename _Base::_Tp_alloc_type		_Tp_alloc_type;
      typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type>	_Alloc_traits;

public:
      typedef _Tp					value_type;
      typedef typename _Base::pointer			pointer;
      typedef typename _Alloc_traits::const_pointer	const_pointer;
      typedef typename _Alloc_traits::reference		reference;
      typedef typename _Alloc_traits::const_reference	const_reference;
      typedef __gnu_cxx::__normal_iterator<pointer, vector> iterator;
      typedef __gnu_cxx::__normal_iterator<const_pointer, vector>
      const_iterator;
      typedef std::reverse_iterator<const_iterator>	const_reverse_iterator;
      typedef std::reverse_iterator<iterator>		reverse_iterator;
      typedef size_t					size_type;
      typedef ptrdiff_t					difference_type;
      typedef _Alloc					allocator_type;

protected:
      using _Base::_M_allocate;
      using _Base::_M_deallocate;
      using _Base::_M_impl;
      using _Base::_M_get_Tp_allocator;

public:
      // [23.2.4.1] construct/copy/destroy
      // (assign() and get_allocator() are also listed in this section)

/**
       *  @brief  Creates a %vector with no elements.
       */
      vector()
#if __cplusplus >= 201103L
      noexcept(is_nothrow_default_constructible<_Alloc>::value)
#endif
      : _Base() { }

/**
       *  @brief  Creates a %vector with no elements.
       *  @param  __a  An allocator object.
       */
      explicit
      vector(const allocator_type& __a) _GLIBCXX_NOEXCEPT
      : _Base(__a) { }

#if __cplusplus >= 201103L
      /**
       *  @brief  Creates a %vector with default constructed elements.
       *  @param  __n  The number of elements to initially create.
       *  @param  __a  An allocator.
       *
       *  This constructor fills the %vector with @a __n default
       *  constructed elements.
       */
      explicit
      vector(size_type __n, const allocator_type& __a = allocator_type())
      : _Base(__n, __a)
      { _M_default_initialize(__n); }

/**
       *  @brief  Creates a %vector with copies of an exemplar element.
       *  @param  __n  The number of elements to initially create.
       *  @param  __value  An element to copy.
       *  @param  __a  An allocator.
       *
       *  This constructor fills the %vector with @a __n copies of @a __value.
       */
      vector(size_type __n, const value_type& __value,
	     const allocator_type& __a = allocator_type())
      : _Base(__n, __a)
      { _M_fill_initialize(__n, __value); }
#else
      /**
       *  @brief  Creates a %vector with copies of an exemplar element.
       *  @param  __n  The number of elements to initially create.
       *  @param  __value  An element to copy.
       *  @param  __a  An allocator.
       *
       *  This constructor fills the %vector with @a __n copies of @a __value.
       */
      explicit
      vector(size_type __n, const value_type& __value = value_type(),
	     const allocator_type& __a = allocator_type())
      : _Base(__n, __a)
      { _M_fill_initialize(__n, __value); }
#endif

/**
       *  @brief  %Vector copy constructor.
       *  @param  __x  A %vector of identical element and allocator types.
       *
       *  All the elements of @a __x are copied, but any unused capacity in
       *  @a __x  will not be copied
       *  (i.e. capacity() == size() in the new %vector).
       *
       *  The newly-created %vector uses a copy of the allocator object used
       *  by @a __x (unless the allocator traits dictate a different object).
       */
      vector(const vector& __x)
      : _Base(__x.size(),
	_Alloc_traits::_S_select_on_copy(__x._M_get_Tp_allocator()))
      {
	this->_M_impl._M_finish =
	  std::__uninitialized_copy_a(__x.begin(), __x.end(),
				      this->_M_impl._M_start,
				      _M_get_Tp_allocator());
      }

#if __cplusplus >= 201103L
      /**
       *  @brief  %Vector move constructor.
       *  @param  __x  A %vector of identical element and allocator types.
       *
       *  The newly-created %vector contains the exact contents of @a __x.
       *  The contents of @a __x are a valid, but unspecified %vector.
       */
      vector(vector&& __x) noexcept
      : _Base(std::move(__x)) { }

/// Copy constructor with alternative allocator
      vector(const vector& __x, const allocator_type& __a)
      : _Base(__x.size(), __a)
      {
	this->_M_impl._M_finish =
	  std::__uninitialized_copy_a(__x.begin(), __x.end(),
				      this->_M_impl._M_start,
				      _M_get_Tp_allocator());
      }

/// Move constructor with alternative allocator
      vector(vector&& __rv, const allocator_type& __m)
      noexcept(_Alloc_traits::_S_always_equal())
      : _Base(std::move(__rv), __m)
      {
	if (__rv.get_allocator() != __m)
	  {
	    this->_M_impl._M_finish =
	      std::__uninitialized_move_a(__rv.begin(), __rv.end(),
					  this->_M_impl._M_start,
					  _M_get_Tp_allocator());
	    __rv.clear();
	  }
      }

/**
       *  @brief  Builds a %vector from an initializer list.
       *  @param  __l  An initializer_list.
       *  @param  __a  An allocator.
       *
       *  Create a %vector consisting of copies of the elements in the
       *  initializer_list @a __l.
       *
       *  This will call the element type's copy constructor N times
       *  (where N is @a __l.size()) and do no memory reallocation.
       */
      vector(initializer_list<value_type> __l,
	     const allocator_type& __a = allocator_type())
      : _Base(__a)
      {
	_M_range_initialize(__l.begin(), __l.end(),
			    random_access_iterator_tag());
      }
#endif

/**
       *  @brief  Builds a %vector from a range.
       *  @param  __first  An input iterator.
       *  @param  __last  An input iterator.
       *  @param  __a  An allocator.
       *
       *  Create a %vector consisting of copies of the elements from
       *  [first,last).
       *
       *  If the iterators are forward, bidirectional, or
       *  random-access, then this will call the elements' copy
       *  constructor N times (where N is distance(first,last)) and do
       *  no memory reallocation.  But if only input iterators are
       *  used, then this will do at most 2N calls to the copy
       *  constructor, and logN memory reallocations.
       */
#if __cplusplus >= 201103L
      template<typename _InputIterator,
	       typename = std::_RequireInputIter<_InputIterator>>
	vector(_InputIterator __first, _InputIterator __last,
	       const allocator_type& __a = allocator_type())
	: _Base(__a)
	{ _M_initialize_dispatch(__first, __last, __false_type()); }
#else
      template<typename _InputIterator>
	vector(_InputIterator __first, _InputIterator __last,
	       const allocator_type& __a = allocator_type())
	: _Base(__a)
	{
	  // Check whether it's an integral type.  If so, it's not an iterator.
	  typedef typename std::__is_integer<_InputIterator>::__type _Integral;
	  _M_initialize_dispatch(__first, __last, _Integral());
	}
#endif

/**
       *  The dtor only erases the elements, and note that if the
       *  elements themselves are pointers, the pointed-to memory is
       *  not touched in any way.  Managing the pointer is the user's
       *  responsibility.
       */
      ~vector() _GLIBCXX_NOEXCEPT
      {
	std::_Destroy(this->_M_impl._M_start, this->_M_impl._M_finish,
		      _M_get_Tp_allocator());
	_GLIBCXX_ASAN_ANNOTATE_BEFORE_DEALLOC;
      }

/**
       *  @brief  %Vector assignment operator.
       *  @param  __x  A %vector of identical element and allocator types.
       *
       *  All the elements of @a __x are copied, but any unused capacity in
       *  @a __x will not be copied.
       *
       *  Whether the allocator is copied depends on the allocator traits.
       */
      vector&
      operator=(const vector& __x);

#if __cplusplus >= 201103L
      /**
       *  @brief  %Vector move assignment operator.
       *  @param  __x  A %vector of identical element and allocator types.
       *
       *  The contents of @a __x are moved into this %vector (without copying,
       *  if the allocators permit it).
       *  Afterwards @a __x is a valid, but unspecified %vector.
       *
       *  Whether the allocator is moved depends on the allocator traits.
       */
      vector&
      operator=(vector&& __x) noexcept(_Alloc_traits::_S_nothrow_move())
      {
	constexpr bool __move_storage =
	  _Alloc_traits::_S_propagate_on_move_assign()
	  || _Alloc_traits::_S_always_equal();
	_M_move_assign(std::move(__x), __bool_constant<__move_storage>());
	return *this;
      }

/**
       *  @brief  %Vector list assignment operator.
       *  @param  __l  An initializer_list.
       *
       *  This function fills a %vector with copies of the elements in the
       *  initializer list @a __l.
       *
       *  Note that the assignment completely changes the %vector and
       *  that the resulting %vector's size is the same as the number
       *  of elements assigned.
       */
      vector&
      operator=(initializer_list<value_type> __l)
      {
	this->_M_assign_aux(__l.begin(), __l.end(),
			    random_access_iterator_tag());
	return *this;
      }
#endif

/**
       *  @brief  Assigns a given value to a %vector.
       *  @param  __n  Number of elements to be assigned.
       *  @param  __val  Value to be assigned.
       *
       *  This function fills a %vector with @a __n copies of the given
       *  value.  Note that the assignment completely changes the
       *  %vector and that the resulting %vector's size is the same as
       *  the number of elements assigned.
       */
      void
      assign(size_type __n, const value_type& __val)
      { _M_fill_assign(__n, __val); }

/**
       *  @brief  Assigns a range to a %vector.
       *  @param  __first  An input iterator.
       *  @param  __last   An input iterator.
       *
       *  This function fills a %vector with copies of the elements in the
       *  range [__first,__last).
       *
       *  Note that the assignment completely changes the %vector and
       *  that the resulting %vector's size is the same as the number
       *  of elements assigned.
       */
#if __cplusplus >= 201103L
      template<typename _InputIterator,
	       typename = std::_RequireInputIter<_InputIterator>>
	void
	assign(_InputIterator __first, _InputIterator __last)
	{ _M_assign_dispatch(__first, __last, __false_type()); }
#else
      template<typename _InputIterator>
	void
	assign(_InputIterator __first, _InputIterator __last)
	{
	  // Check whether it's an integral type.  If so, it's not an iterator.
	  typedef typename std::__is_integer<_InputIterator>::__type _Integral;
	  _M_assign_dispatch(__first, __last, _Integral());
	}
#endif

#if __cplusplus >= 201103L
      /**
       *  @brief  Assigns an initializer list to a %vector.
       *  @param  __l  An initializer_list.
       *
       *  This function fills a %vector with copies of the elements in the
       *  initializer list @a __l.
       *
       *  Note that the assignment completely changes the %vector and
       *  that the resulting %vector's size is the same as the number
       *  of elements assigned.
       */
      void
      assign(initializer_list<value_type> __l)
      {
	this->_M_assign_aux(__l.begin(), __l.end(),
			    random_access_iterator_tag());
      }
#endif

/// Get a copy of the memory allocation object.
      using _Base::get_allocator;

// iterators
      /**
       *  Returns a read/write iterator that points to the first
       *  element in the %vector.  Iteration is done in ordinary
       *  element order.
       */
      iterator
      begin() _GLIBCXX_NOEXCEPT
      { return iterator(this->_M_impl._M_start); }

/**
       *  Returns a read-only (constant) iterator that points to the
       *  first element in the %vector.  Iteration is done in ordinary
       *  element order.
       */
      const_iterator
      begin() const _GLIBCXX_NOEXCEPT
      { return const_iterator(this->_M_impl._M_start); }

/**
       *  Returns a read/write iterator that points one past the last
       *  element in the %vector.  Iteration is done in ordinary
       *  element order.
       */
      iterator
      end() _GLIBCXX_NOEXCEPT
      { return iterator(this->_M_impl._M_finish); }

/**
       *  Returns a read-only (constant) iterator that points one past
       *  the last element in the %vector.  Iteration is done in
       *  ordinary element order.
       */
      const_iterator
      end() const _GLIBCXX_NOEXCEPT
      { return const_iterator(this->_M_impl._M_finish); }

/**
       *  Returns a read/write reverse iterator that points to the
       *  last element in the %vector.  Iteration is done in reverse
       *  element order.
       */
      reverse_iterator
      rbegin() _GLIBCXX_NOEXCEPT
      { return reverse_iterator(end()); }

/**
       *  Returns a read-only (constant) reverse iterator that points
       *  to the last element in the %vector.  Iteration is done in
       *  reverse element order.
       */
      const_reverse_iterator
      rbegin() const _GLIBCXX_NOEXCEPT
      { return const_reverse_iterator(end()); }

/**
       *  Returns a read/write reverse iterator that points to one
       *  before the first element in the %vector.  Iteration is done
       *  in reverse element order.
       */
      reverse_iterator
      rend() _GLIBCXX_NOEXCEPT
      { return reverse_iterator(begin()); }

/**
       *  Returns a read-only (constant) reverse iterator that points
       *  to one before the first element in the %vector.  Iteration
       *  is done in reverse element order.
       */
      const_reverse_iterator
      rend() const _GLIBCXX_NOEXCEPT
      { return const_reverse_iterator(begin()); }

#if __cplusplus >= 201103L
      /**
       *  Returns a read-only (constant) iterator that points to the
       *  first element in the %vector.  Iteration is done in ordinary
       *  element order.
       */
      const_iterator
      cbegin() const noexcept
      { return const_iterator(this->_M_impl._M_start); }

/**
       *  Returns a read-only (constant) iterator that points one past
       *  the last element in the %vector.  Iteration is done in
       *  ordinary element order.
       */
      const_iterator
      cend() const noexcept
      { return const_iterator(this->_M_impl._M_finish); }

/**
       *  Returns a read-only (constant) reverse iterator that points
       *  to the last element in the %vector.  Iteration is done in
       *  reverse element order.
       */
      const_reverse_iterator
      crbegin() const noexcept
      { return const_reverse_iterator(end()); }

/**
       *  Returns a read-only (constant) reverse iterator that points
       *  to one before the first element in the %vector.  Iteration
       *  is done in reverse element order.
       */
      const_reverse_iterator
      crend() const noexcept
      { return const_reverse_iterator(begin()); }
#endif

// [23.2.4.2] capacity
      /**  Returns the number of elements in the %vector.  */
      size_type
      size() const _GLIBCXX_NOEXCEPT
      { return size_type(this->_M_impl._M_finish - this->_M_impl._M_start); }

/**  Returns the size() of the largest possible %vector.  */
      size_type
      max_size() const _GLIBCXX_NOEXCEPT
      { return _Alloc_traits::max_size(_M_get_Tp_allocator()); }

#if __cplusplus >= 201103L
      /**
       *  @brief  Resizes the %vector to the specified number of elements.
       *  @param  __new_size  Number of elements the %vector should contain.
       *
       *  This function will %resize the %vector to the specified
       *  number of elements.  If the number is smaller than the
       *  %vector's current size the %vector is truncated, otherwise
       *  default constructed elements are appended.
       */
      void
      resize(size_type __new_size)
      {
	if (__new_size > size())
	  _M_default_append(__new_size - size());
	else if (__new_size < size())
	  _M_erase_at_end(this->_M_impl._M_start + __new_size);
      }

/**
       *  @brief  Resizes the %vector to the specified number of elements.
       *  @param  __new_size  Number of elements the %vector should contain.
       *  @param  __x  Data with which new elements should be populated.
       *
       *  This function will %resize the %vector to the specified
       *  number of elements.  If the number is smaller than the
       *  %vector's current size the %vector is truncated, otherwise
       *  the %vector is extended and new elements are populated with
       *  given data.
       */
      void
      resize(size_type __new_size, const value_type& __x)
      {
	if (__new_size > size())
	  _M_fill_insert(end(), __new_size - size(), __x);
	else if (__new_size < size())
	  _M_erase_at_end(this->_M_impl._M_start + __new_size);
      }
#else
      /**
       *  @brief  Resizes the %vector to the specified number of elements.
       *  @param  __new_size  Number of elements the %vector should contain.
       *  @param  __x  Data with which new elements should be populated.
       *
       *  This function will %resize the %vector to the specified
       *  number of elements.  If the number is smaller than the
       *  %vector's current size the %vector is truncated, otherwise
       *  the %vector is extended and new elements are populated with
       *  given data.
       */
      void
      resize(size_type __new_size, value_type __x = value_type())
      {
	if (__new_size > size())
	  _M_fill_insert(end(), __new_size - size(), __x);
	else if (__new_size < size())
	  _M_erase_at_end(this->_M_impl._M_start + __new_size);
      }
#endif

#if __cplusplus >= 201103L
      /**  A non-binding request to reduce capacity() to size().  */
      void
      shrink_to_fit()
      { _M_shrink_to_fit(); }
#endif

/**
       *  Returns the total number of elements that the %vector can
       *  hold before needing to allocate more memory.
       */
      size_type
      capacity() const _GLIBCXX_NOEXCEPT
      { return size_type(this->_M_impl._M_end_of_storage
			 - this->_M_impl._M_start); }

/**
       *  Returns true if the %vector is empty.  (Thus begin() would
       *  equal end().)
       */
      bool
      empty() const _GLIBCXX_NOEXCEPT
      { return begin() == end(); }

/**
       *  @brief  Attempt to preallocate enough memory for specified number of
       *          elements.
       *  @param  __n  Number of elements required.
       *  @throw  std::length_error  If @a n exceeds @c max_size().
       *
       *  This function attempts to reserve enough memory for the
       *  %vector to hold the specified number of elements.  If the
       *  number requested is more than max_size(), length_error is
       *  thrown.
       *
       *  The advantage of this function is that if optimal code is a
       *  necessity and the user can determine the number of elements
       *  that will be required, the user can reserve the memory in
       *  %advance, and thus prevent a possible reallocation of memory
       *  and copying of %vector data.
       */
      void
      reserve(size_type __n);

// element access
      /**
       *  @brief  Subscript access to the data contained in the %vector.
       *  @param __n The index of the element for which data should be
       *  accessed.
       *  @return  Read/write reference to data.
       *
       *  This operator allows for easy, array-style, data access.
       *  Note that data access with this operator is unchecked and
       *  out_of_range lookups are not defined. (For checked lookups
       *  see at().)
       */
      reference
      operator[](size_type __n) _GLIBCXX_NOEXCEPT
      {
	__glibcxx_requires_subscript(__n);
	return *(this->_M_impl._M_start + __n);
      }

/**
       *  @brief  Subscript access to the data contained in the %vector.
       *  @param __n The index of the element for which data should be
       *  accessed.
       *  @return  Read-only (constant) reference to data.
       *
       *  This operator allows for easy, array-style, data access.
       *  Note that data access with this operator is unchecked and
       *  out_of_range lookups are not defined. (For checked lookups
       *  see at().)
       */
      const_reference
      operator[](size_type __n) const _GLIBCXX_NOEXCEPT
      {
	__glibcxx_requires_subscript(__n);
	return *(this->_M_impl._M_start + __n);
      }

protected:
      /// Safety check used only from at().
      void
      _M_range_check(size_type __n) const
      {
	if (__n >= this->size())
	  __throw_out_of_range_fmt(__N("vector::_M_range_check: __n "
				       "(which is %zu) >= this->size() "
				       "(which is %zu)"),
				   __n, this->size());
      }

public:
      /**
       *  @brief  Provides access to the data contained in the %vector.
       *  @param __n The index of the element for which data should be
       *  accessed.
       *  @return  Read/write reference to data.
       *  @throw  std::out_of_range  If @a __n is an invalid index.
       *
       *  This function provides for safer data access.  The parameter
       *  is first checked that it is in the range of the vector.  The
       *  function throws out_of_range if the check fails.
       */
      reference
      at(size_type __n)
      {
	_M_range_check(__n);
	return (*this)[__n];
      }

/**
       *  @brief  Provides access to the data contained in the %vector.
       *  @param __n The index of the element for which data should be
       *  accessed.
       *  @return  Read-only (constant) reference to data.
       *  @throw  std::out_of_range  If @a __n is an invalid index.
       *
       *  This function provides for safer data access.  The parameter
       *  is first checked that it is in the range of the vector.  The
       *  function throws out_of_range if the check fails.
       */
      const_reference
      at(size_type __n) const
      {
	_M_range_check(__n);
	return (*this)[__n];
      }

/**
       *  Returns a read/write reference to the data at the first
       *  element of the %vector.
       */
      reference
      front() _GLIBCXX_NOEXCEPT
      {
	__glibcxx_requires_nonempty();
	return *begin();
      }

/**
       *  Returns a read-only (constant) reference to the data at the first
       *  element of the %vector.
       */
      const_reference
      front() const _GLIBCXX_NOEXCEPT
      {
	__glibcxx_requires_nonempty();
	return *begin();
      }

/**
       *  Returns a read/write reference to the data at the last
       *  element of the %vector.
       */
      reference
      back() _GLIBCXX_NOEXCEPT
      {
	__glibcxx_requires_nonempty();
	return *(end() - 1);
      }

/**
       *  Returns a read-only (constant) reference to the data at the
       *  last element of the %vector.
       */
      const_reference
      back() const _GLIBCXX_NOEXCEPT
      {
	__glibcxx_requires_nonempty();
	return *(end() - 1);
      }

// _GLIBCXX_RESOLVE_LIB_DEFECTS
      // DR 464. Suggestion for new member functions in standard containers.
      // data access
      /**
       *   Returns a pointer such that [data(), data() + size()) is a valid
       *   range.  For a non-empty %vector, data() == &front().
       */
      _Tp*
      data() _GLIBCXX_NOEXCEPT
      { return _M_data_ptr(this->_M_impl._M_start); }

const _Tp*
      data() const _GLIBCXX_NOEXCEPT
      { return _M_data_ptr(this->_M_impl._M_start); }

// [23.2.4.3] modifiers
      /**
       *  @brief  Add data to the end of the %vector.
       *  @param  __x  Data to be added.
       *
       *  This is a typical stack operation.  The function creates an
       *  element at the end of the %vector and assigns the given data
       *  to it.  Due to the nature of a %vector this operation can be
       *  done in constant time if the %vector has preallocated space
       *  available.
       */
      void
      push_back(const value_type& __x)
      {
	if (this->_M_impl._M_finish != this->_M_impl._M_end_of_storage)
	  {
	    _GLIBCXX_ASAN_ANNOTATE_GROW(1);
	    _Alloc_traits::construct(this->_M_impl, this->_M_impl._M_finish,
				     __x);
	    ++this->_M_impl._M_finish;
	    _GLIBCXX_ASAN_ANNOTATE_GREW(1);
	  }
	else
	  _M_realloc_insert(end(), __x);
      }

#if __cplusplus >= 201103L
      void
      push_back(value_type&& __x)
      { emplace_back(std::move(__x)); }

template<typename... _Args>
#if __cplusplus > 201402L
	reference
#else
	void
#endif
	emplace_back(_Args&&... __args);
#endif

/**
       *  @brief  Removes last element.
       *
       *  This is a typical stack operation. It shrinks the %vector by one.
       *
       *  Note that no data is returned, and if the last element's
       *  data is needed, it should be retrieved before pop_back() is
       *  called.
       */
      void
      pop_back() _GLIBCXX_NOEXCEPT
      {
	__glibcxx_requires_nonempty();
	--this->_M_impl._M_finish;
	_Alloc_traits::destroy(this->_M_impl, this->_M_impl._M_finish);
	_GLIBCXX_ASAN_ANNOTATE_SHRINK(1);
      }

#if __cplusplus >= 201103L
      /**
       *  @brief  Inserts an object in %vector before specified iterator.
       *  @param  __position  A const_iterator into the %vector.
       *  @param  __args  Arguments.
       *  @return  An iterator that points to the inserted data.
       *
       *  This function will insert an object of type T constructed
       *  with T(std::forward<Args>(args)...) before the specified location.
       *  Note that this kind of operation could be expensive for a %vector
       *  and if it is frequently used the user should consider using
       *  std::list.
       */
      template<typename... _Args>
	iterator
	emplace(const_iterator __position, _Args&&... __args)
	{ return _M_emplace_aux(__position, std::forward<_Args>(__args)...); }

/**
       *  @brief  Inserts given value into %vector before specified iterator.
       *  @param  __position  A const_iterator into the %vector.
       *  @param  __x  Data to be inserted.
       *  @return  An iterator that points to the inserted data.
       *
       *  This function will insert a copy of the given value before
       *  the specified location.  Note that this kind of operation
       *  could be expensive for a %vector and if it is frequently
       *  used the user should consider using std::list.
       */
      iterator
      insert(const_iterator __position, const value_type& __x);
#else
      /**
       *  @brief  Inserts given value into %vector before specified iterator.
       *  @param  __position  An iterator into the %vector.
       *  @param  __x  Data to be inserted.
       *  @return  An iterator that points to the inserted data.
       *
       *  This function will insert a copy of the given value before
       *  the specified location.  Note that this kind of operation
       *  could be expensive for a %vector and if it is frequently
       *  used the user should consider using std::list.
       */
      iterator
      insert(iterator __position, const value_type& __x);
#endif

#if __cplusplus >= 201103L
      /**
       *  @brief  Inserts given rvalue into %vector before specified iterator.
       *  @param  __position  A const_iterator into the %vector.
       *  @param  __x  Data to be inserted.
       *  @return  An iterator that points to the inserted data.
       *
       *  This function will insert a copy of the given rvalue before
       *  the specified location.  Note that this kind of operation
       *  could be expensive for a %vector and if it is frequently
       *  used the user should consider using std::list.
       */
      iterator
      insert(const_iterator __position, value_type&& __x)
      { return _M_insert_rval(__position, std::move(__x)); }

/**
       *  @brief  Inserts an initializer_list into the %vector.
       *  @param  __position  An iterator into the %vector.
       *  @param  __l  An initializer_list.
       *
       *  This function will insert copies of the data in the
       *  initializer_list @a l into the %vector before the location
       *  specified by @a position.
       *
       *  Note that this kind of operation could be expensive for a
       *  %vector and if it is frequently used the user should
       *  consider using std::list.
       */
      iterator
      insert(const_iterator __position, initializer_list<value_type> __l)
      {
	auto __offset = __position - cbegin();
	_M_range_insert(begin() + __offset, __l.begin(), __l.end(),
			std::random_access_iterator_tag());
	return begin() + __offset;
      }
#endif

#if __cplusplus >= 201103L
      /**
       *  @brief  Inserts a number of copies of given data into the %vector.
       *  @param  __position  A const_iterator into the %vector.
       *  @param  __n  Number of elements to be inserted.
       *  @param  __x  Data to be inserted.
       *  @return  An iterator that points to the inserted data.
       *
       *  This function will insert a specified number of copies of
       *  the given data before the location specified by @a position.
       *
       *  Note that this kind of operation could be expensive for a
       *  %vector and if it is frequently used the user should
       *  consider using std::list.
       */
      iterator
      insert(const_iterator __position, size_type __n, const value_type& __x)
      {
	difference_type __offset = __position - cbegin();
	_M_fill_insert(begin() + __offset, __n, __x);
	return begin() + __offset;
      }
#else
      /**
       *  @brief  Inserts a number of copies of given data into the %vector.
       *  @param  __position  An iterator into the %vector.
       *  @param  __n  Number of elements to be inserted.
       *  @param  __x  Data to be inserted.
       *
       *  This function will insert a specified number of copies of
       *  the given data before the location specified by @a position.
       *
       *  Note that this kind of operation could be expensive for a
       *  %vector and if it is frequently used the user should
       *  consider using std::list.
       */
      void
      insert(iterator __position, size_type __n, const value_type& __x)
      { _M_fill_insert(__position, __n, __x); }
#endif

#if __cplusplus >= 201103L
      /**
       *  @brief  Inserts a range into the %vector.
       *  @param  __position  A const_iterator into the %vector.
       *  @param  __first  An input iterator.
       *  @param  __last   An input iterator.
       *  @return  An iterator that points to the inserted data.
       *
       *  This function will insert copies of the data in the range
       *  [__first,__last) into the %vector before the location specified
       *  by @a pos.
       *
       *  Note that this kind of operation could be expensive for a
       *  %vector and if it is frequently used the user should
       *  consider using std::list.
       */
      template<typename _InputIterator,
	       typename = std::_RequireInputIter<_InputIterator>>
	iterator
	insert(const_iterator __position, _InputIterator __first,
	       _InputIterator __last)
	{
	  difference_type __offset = __position - cbegin();
	  _M_insert_dispatch(begin() + __offset,
			     __first, __last, __false_type());
	  return begin() + __offset;
	}
#else
      /**
       *  @brief  Inserts a range into the %vector.
       *  @param  __position  An iterator into the %vector.
       *  @param  __first  An input iterator.
       *  @param  __last   An input iterator.
       *
       *  This function will insert copies of the data in the range
       *  [__first,__last) into the %vector before the location specified
       *  by @a pos.
       *
       *  Note that this kind of operation could be expensive for a
       *  %vector and if it is frequently used the user should
       *  consider using std::list.
       */
      template<typename _InputIterator>
	void
	insert(iterator __position, _InputIterator __first,
	       _InputIterator __last)
	{
	  // Check whether it's an integral type.  If so, it's not an iterator.
	  typedef typename std::__is_integer<_InputIterator>::__type _Integral;
	  _M_insert_dispatch(__position, __first, __last, _Integral());
	}
#endif

/**
       *  @brief  Remove element at given position.
       *  @param  __position  Iterator pointing to element to be erased.
       *  @return  An iterator pointing to the next element (or end()).
       *
       *  This function will erase the element at the given position and thus
       *  shorten the %vector by one.
       *
       *  Note This operation could be expensive and if it is
       *  frequently used the user should consider using std::list.
       *  The user is also cautioned that this function only erases
       *  the element, and that if the element is itself a pointer,
       *  the pointed-to memory is not touched in any way.  Managing
       *  the pointer is the user's responsibility.
       */
      iterator
#if __cplusplus >= 201103L
      erase(const_iterator __position)
      { return _M_erase(begin() + (__position - cbegin())); }
#else
      erase(iterator __position)
      { return _M_erase(__position); }
#endif

/**
       *  @brief  Remove a range of elements.
       *  @param  __first  Iterator pointing to the first element to be erased.
       *  @param  __last  Iterator pointing to one past the last element to be
       *                  erased.
       *  @return  An iterator pointing to the element pointed to by @a __last
       *           prior to erasing (or end()).
       *
       *  This function will erase the elements in the range
       *  [__first,__last) and shorten the %vector accordingly.
       *
       *  Note This operation could be expensive and if it is
       *  frequently used the user should consider using std::list.
       *  The user is also cautioned that this function only erases
       *  the elements, and that if the elements themselves are
       *  pointers, the pointed-to memory is not touched in any way.
       *  Managing the pointer is the user's responsibility.
       */
      iterator
#if __cplusplus >= 201103L
      erase(const_iterator __first, const_iterator __last)
      {
	const auto __beg = begin();
	const auto __cbeg = cbegin();
	return _M_erase(__beg + (__first - __cbeg), __beg + (__last - __cbeg));
      }
#else
      erase(iterator __first, iterator __last)
      { return _M_erase(__first, __last); }
#endif

/**
       *  @brief  Swaps data with another %vector.
       *  @param  __x  A %vector of the same element and allocator types.
       *
       *  This exchanges the elements between two vectors in constant time.
       *  (Three pointers, so it should be quite fast.)
       *  Note that the global std::swap() function is specialized such that
       *  std::swap(v1,v2) will feed to this function.
       *
       *  Whether the allocators are swapped depends on the allocator traits.
       */
      void
      swap(vector& __x) _GLIBCXX_NOEXCEPT
      {
#if __cplusplus >= 201103L
	__glibcxx_assert(_Alloc_traits::propagate_on_container_swap::value
			 || _M_get_Tp_allocator() == __x._M_get_Tp_allocator());
#endif
	this->_M_impl._M_swap_data(__x._M_impl);
	_Alloc_traits::_S_on_swap(_M_get_Tp_allocator(),
				  __x._M_get_Tp_allocator());
      }

/**
       *  Erases all the elements.  Note that this function only erases the
       *  elements, and that if the elements themselves are pointers, the
       *  pointed-to memory is not touched in any way.  Managing the pointer is
       *  the user's responsibility.
       */
      void
      clear() _GLIBCXX_NOEXCEPT
      { _M_erase_at_end(this->_M_impl._M_start); }

protected:
      /**
       *  Memory expansion handler.  Uses the member allocation function to
       *  obtain @a n bytes of memory, and then copies [first,last) into it.
       */
      template<typename _ForwardIterator>
	pointer
	_M_allocate_and_copy(size_type __n,
			     _ForwardIterator __first, _ForwardIterator __last)
	{
	  pointer __result = this->_M_allocate(__n);
	  __try
	    {
	      std::__uninitialized_copy_a(__first, __last, __result,
					  _M_get_Tp_allocator());
	      return __result;
	    }
	  __catch(...)
	    {
	      _M_deallocate(__result, __n);
	      __throw_exception_again;
	    }
	}

// Internal constructor functions follow.

// Called by the range constructor to implement [23.1.1]/9

// _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 438. Ambiguity in the "do the right thing" clause
      template<typename _Integer>
	void
	_M_initialize_dispatch(_Integer __n, _Integer __value, __true_type)
	{
	  this->_M_impl._M_start = _M_allocate(static_cast<size_type>(__n));
	  this->_M_impl._M_end_of_storage =
	    this->_M_impl._M_start + static_cast<size_type>(__n);
	  _M_fill_initialize(static_cast<size_type>(__n), __value);
	}

// Called by the range constructor to implement [23.1.1]/9
      template<typename _InputIterator>
	void
	_M_initialize_dispatch(_InputIterator __first, _InputIterator __last,
			       __false_type)
	{
	  typedef typename std::iterator_traits<_InputIterator>::
	    iterator_category _IterCategory;
	  _M_range_initialize(__first, __last, _IterCategory());
	}

// Called by the second initialize_dispatch above
      template<typename _InputIterator>
	void
	_M_range_initialize(_InputIterator __first, _InputIterator __last,
			    std::input_iterator_tag)
	{
	  __try {
	    for (; __first != __last; ++__first)
#if __cplusplus >= 201103L
	      emplace_back(*__first);
#else
	      push_back(*__first);
#endif
	  } __catch(...) {
	    clear();
	    __throw_exception_again;
	  }
	}

// Called by the second initialize_dispatch above
      template<typename _ForwardIterator>
	void
	_M_range_initialize(_ForwardIterator __first, _ForwardIterator __last,
			    std::forward_iterator_tag)
	{
	  const size_type __n = std::distance(__first, __last);
	  this->_M_impl._M_start = this->_M_allocate(__n);
	  this->_M_impl._M_end_of_storage = this->_M_impl._M_start + __n;
	  this->_M_impl._M_finish =
	    std::__uninitialized_copy_a(__first, __last,
					this->_M_impl._M_start,
					_M_get_Tp_allocator());
	}

// Called by the first initialize_dispatch above and by the
      // vector(n,value,a) constructor.
      void
      _M_fill_initialize(size_type __n, const value_type& __value)
      {
	this->_M_impl._M_finish =
	  std::__uninitialized_fill_n_a(this->_M_impl._M_start, __n, __value,
					_M_get_Tp_allocator());
      }

#if __cplusplus >= 201103L
      // Called by the vector(n) constructor.
      void
      _M_default_initialize(size_type __n)
      {
	this->_M_impl._M_finish =
	  std::__uninitialized_default_n_a(this->_M_impl._M_start, __n,
					   _M_get_Tp_allocator());
      }
#endif

// Internal assign functions follow.  The *_aux functions do the actual
      // assignment work for the range versions.

// Called by the range assign to implement [23.1.1]/9

// _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 438. Ambiguity in the "do the right thing" clause
      template<typename _Integer>
	void
	_M_assign_dispatch(_Integer __n, _Integer __val, __true_type)
	{ _M_fill_assign(__n, __val); }

// Called by the range assign to implement [23.1.1]/9
      template<typename _InputIterator>
	void
	_M_assign_dispatch(_InputIterator __first, _InputIterator __last,
			   __false_type)
	{ _M_assign_aux(__first, __last, std::__iterator_category(__first)); }

// Called by the second assign_dispatch above
      template<typename _InputIterator>
	void
	_M_assign_aux(_InputIterator __first, _InputIterator __last,
		      std::input_iterator_tag);

// Called by the second assign_dispatch above
      template<typename _ForwardIterator>
	void
	_M_assign_aux(_ForwardIterator __first, _ForwardIterator __last,
		      std::forward_iterator_tag);

// Called by assign(n,t), and the range assign when it turns out
      // to be the same thing.
      void
      _M_fill_assign(size_type __n, const value_type& __val);

// Internal insert functions follow.

// Called by the range insert to implement [23.1.1]/9

// _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 438. Ambiguity in the "do the right thing" clause
      template<typename _Integer>
	void
	_M_insert_dispatch(iterator __pos, _Integer __n, _Integer __val,
			   __true_type)
	{ _M_fill_insert(__pos, __n, __val); }

// Called by the range insert to implement [23.1.1]/9
      template<typename _InputIterator>
	void
	_M_insert_dispatch(iterator __pos, _InputIterator __first,
			   _InputIterator __last, __false_type)
	{
	  _M_range_insert(__pos, __first, __last,
			  std::__iterator_category(__first));
	}

// Called by the second insert_dispatch above
      template<typename _InputIterator>
	void
	_M_range_insert(iterator __pos, _InputIterator __first,
			_InputIterator __last, std::input_iterator_tag);

// Called by the second insert_dispatch above
      template<typename _ForwardIterator>
	void
	_M_range_insert(iterator __pos, _ForwardIterator __first,
			_ForwardIterator __last, std::forward_iterator_tag);

// Called by insert(p,n,x), and the range insert when it turns out to be
      // the same thing.
      void
      _M_fill_insert(iterator __pos, size_type __n, const value_type& __x);

#if __cplusplus >= 201103L
      // Called by resize(n).
      void
      _M_default_append(size_type __n);

bool
      _M_shrink_to_fit();
#endif

#if __cplusplus < 201103L
      // Called by insert(p,x)
      void
      _M_insert_aux(iterator __position, const value_type& __x);

void
      _M_realloc_insert(iterator __position, const value_type& __x);
#else
      // A value_type object constructed with _Alloc_traits::construct()
      // and destroyed with _Alloc_traits::destroy().
      struct _Temporary_value
      {
	template<typename... _Args>
	  explicit
	  _Temporary_value(vector* __vec, _Args&&... __args) : _M_this(__vec)
	  {
	    _Alloc_traits::construct(_M_this->_M_impl, _M_ptr(),
				     std::forward<_Args>(__args)...);
	  }

~_Temporary_value()
	{ _Alloc_traits::destroy(_M_this->_M_impl, _M_ptr()); }

value_type&
	_M_val() { return *_M_ptr(); }

private:
	_Tp*
	_M_ptr() { return reinterpret_cast<_Tp*>(&__buf); }

vector* _M_this;
	typename aligned_storage<sizeof(_Tp), alignof(_Tp)>::type __buf;
      };

// Called by insert(p,x) and other functions when insertion needs to
      // reallocate or move existing elements. _Arg is either _Tp& or _Tp.
      template<typename _Arg>
	void
	_M_insert_aux(iterator __position, _Arg&& __arg);

template<typename... _Args>
	void
	_M_realloc_insert(iterator __position, _Args&&... __args);

// Either move-construct at the end, or forward to _M_insert_aux.
      iterator
      _M_insert_rval(const_iterator __position, value_type&& __v);

// Try to emplace at the end, otherwise forward to _M_insert_aux.
      template<typename... _Args>
	iterator
	_M_emplace_aux(const_iterator __position, _Args&&... __args);

// Emplacing an rvalue of the correct type can use _M_insert_rval.
      iterator
      _M_emplace_aux(const_iterator __position, value_type&& __v)
      { return _M_insert_rval(__position, std::move(__v)); }
#endif

// Called by _M_fill_insert, _M_insert_aux etc.
      size_type
      _M_check_len(size_type __n, const char* __s) const
      {
	if (max_size() - size() < __n)
	  __throw_length_error(__N(__s));

const size_type __len = size() + std::max(size(), __n);
	return (__len < size() || __len > max_size()) ? max_size() : __len;
      }

// Internal erase functions follow.

// Called by erase(q1,q2), clear(), resize(), _M_fill_assign,
      // _M_assign_aux.
      void
      _M_erase_at_end(pointer __pos) _GLIBCXX_NOEXCEPT
      {
	if (size_type __n = this->_M_impl._M_finish - __pos)
	  {
	    std::_Destroy(__pos, this->_M_impl._M_finish,
			  _M_get_Tp_allocator());
	    this->_M_impl._M_finish = __pos;
	    _GLIBCXX_ASAN_ANNOTATE_SHRINK(__n);
	  }
      }

iterator
      _M_erase(iterator __position);

iterator
      _M_erase(iterator __first, iterator __last);

#if __cplusplus >= 201103L
    private:
      // Constant-time move assignment when source object's memory can be
      // moved, either because the source's allocator will move too
      // or because the allocators are equal.
      void
      _M_move_assign(vector&& __x, std::true_type) noexcept
      {
	vector __tmp(get_allocator());
	this->_M_impl._M_swap_data(__tmp._M_impl);
	this->_M_impl._M_swap_data(__x._M_impl);
	std::__alloc_on_move(_M_get_Tp_allocator(), __x._M_get_Tp_allocator());
      }

// Do move assignment when it might not be possible to move source
      // object's memory, resulting in a linear-time operation.
      void
      _M_move_assign(vector&& __x, std::false_type)
      {
	if (__x._M_get_Tp_allocator() == this->_M_get_Tp_allocator())
	  _M_move_assign(std::move(__x), std::true_type());
	else
	  {
	    // The rvalue's allocator cannot be moved and is not equal,
	    // so we need to individually move each element.
	    this->assign(std::__make_move_if_noexcept_iterator(__x.begin()),
			 std::__make_move_if_noexcept_iterator(__x.end()));
	    __x.clear();
	  }
      }
#endif

template<typename _Up>
	_Up*
	_M_data_ptr(_Up* __ptr) const _GLIBCXX_NOEXCEPT
	{ return __ptr; }

#if __cplusplus >= 201103L
      template<typename _Ptr>
	typename std::pointer_traits<_Ptr>::element_type*
	_M_data_ptr(_Ptr __ptr) const
	{ return empty() ? nullptr : std::__to_address(__ptr); }
#else
      template<typename _Up>
	_Up*
	_M_data_ptr(_Up* __ptr) _GLIBCXX_NOEXCEPT
	{ return __ptr; }

template<typename _Ptr>
	value_type*
	_M_data_ptr(_Ptr __ptr)
	{ return empty() ? (value_type*)0 : __ptr.operator->(); }

template<typename _Ptr>
	const value_type*
	_M_data_ptr(_Ptr __ptr) const
	{ return empty() ? (const value_type*)0 : __ptr.operator->(); }
#endif
    };

#if __cpp_deduction_guides >= 201606
  template<typename _InputIterator, typename _ValT
	     = typename iterator_traits<_InputIterator>::value_type,
	   typename _Allocator = allocator<_ValT>,
	   typename = _RequireInputIter<_InputIterator>,
	   typename = _RequireAllocator<_Allocator>>
    vector(_InputIterator, _InputIterator, _Allocator = _Allocator())
      -> vector<_ValT, _Allocator>;
#endif

/**
   *  @brief  Vector equality comparison.
   *  @param  __x  A %vector.
   *  @param  __y  A %vector of the same type as @a __x.
   *  @return  True iff the size and elements of the vectors are equal.
   *
   *  This is an equivalence relation.  It is linear in the size of the
   *  vectors.  Vectors are considered equivalent if their sizes are equal,
   *  and if corresponding elements compare equal.
  */
  template<typename _Tp, typename _Alloc>
    inline bool
    operator==(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
    { return (__x.size() == __y.size()
	      && std::equal(__x.begin(), __x.end(), __y.begin())); }

/**
   *  @brief  Vector ordering relation.
   *  @param  __x  A %vector.
   *  @param  __y  A %vector of the same type as @a __x.
   *  @return  True iff @a __x is lexicographically less than @a __y.
   *
   *  This is a total ordering relation.  It is linear in the size of the
   *  vectors.  The elements must be comparable with @c <.
   *
   *  See std::lexicographical_compare() for how the determination is made.
  */
  template<typename _Tp, typename _Alloc>
    inline bool
    operator<(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
    { return std::lexicographical_compare(__x.begin(), __x.end(),
					  __y.begin(), __y.end()); }

/// Based on operator==
  template<typename _Tp, typename _Alloc>
    inline bool
    operator!=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
    { return !(__x == __y); }

/// Based on operator<
  template<typename _Tp, typename _Alloc>
    inline bool
    operator>(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
    { return __y < __x; }

/// Based on operator<
  template<typename _Tp, typename _Alloc>
    inline bool
    operator<=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
    { return !(__y < __x); }

/// Based on operator<
  template<typename _Tp, typename _Alloc>
    inline bool
    operator>=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
    { return !(__x < __y); }

/// See std::vector::swap().
  template<typename _Tp, typename _Alloc>
    inline void
    swap(vector<_Tp, _Alloc>& __x, vector<_Tp, _Alloc>& __y)
    _GLIBCXX_NOEXCEPT_IF(noexcept(__x.swap(__y)))
    { __x.swap(__y); }

_GLIBCXX_END_NAMESPACE_CONTAINER
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#endif /* _STL_VECTOR_H */

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