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//usr/include/c++/9/bits/stl_deque.h
// Deque implementation -*- C++ -*- // Copyright (C) 2001-2019 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) 1997 * 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_deque.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{deque} */ #ifndef _STL_DEQUE_H #define _STL_DEQUE_H 1 #include <bits/concept_check.h> #include <bits/stl_iterator_base_types.h> #include <bits/stl_iterator_base_funcs.h> #if __cplusplus >= 201103L #include <initializer_list> #include <bits/stl_uninitialized.h> // for __is_bitwise_relocatable #endif #include <debug/assertions.h> namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION _GLIBCXX_BEGIN_NAMESPACE_CONTAINER /** * @brief This function controls the size of memory nodes. * @param __size The size of an element. * @return The number (not byte size) of elements per node. * * This function started off as a compiler kludge from SGI, but * seems to be a useful wrapper around a repeated constant * expression. The @b 512 is tunable (and no other code needs to * change), but no investigation has been done since inheriting the * SGI code. Touch _GLIBCXX_DEQUE_BUF_SIZE only if you know what * you are doing, however: changing it breaks the binary * compatibility!! */ #ifndef _GLIBCXX_DEQUE_BUF_SIZE #define _GLIBCXX_DEQUE_BUF_SIZE 512 #endif _GLIBCXX_CONSTEXPR inline size_t __deque_buf_size(size_t __size) { return (__size < _GLIBCXX_DEQUE_BUF_SIZE ? size_t(_GLIBCXX_DEQUE_BUF_SIZE / __size) : size_t(1)); } /** * @brief A deque::iterator. * * Quite a bit of intelligence here. Much of the functionality of * deque is actually passed off to this class. A deque holds two * of these internally, marking its valid range. Access to * elements is done as offsets of either of those two, relying on * operator overloading in this class. * * All the functions are op overloads except for _M_set_node. */ template<typename _Tp, typename _Ref, typename _Ptr> struct _Deque_iterator { #if __cplusplus < 201103L typedef _Deque_iterator<_Tp, _Tp&, _Tp*> iterator; typedef _Deque_iterator<_Tp, const _Tp&, const _Tp*> const_iterator; typedef _Tp* _Elt_pointer; typedef _Tp** _Map_pointer; #else private: template<typename _Up> using __ptr_to = typename pointer_traits<_Ptr>::template rebind<_Up>; template<typename _CvTp> using __iter = _Deque_iterator<_Tp, _CvTp&, __ptr_to<_CvTp>>; public: typedef __iter<_Tp> iterator; typedef __iter<const _Tp> const_iterator; typedef __ptr_to<_Tp> _Elt_pointer; typedef __ptr_to<_Elt_pointer> _Map_pointer; #endif static size_t _S_buffer_size() _GLIBCXX_NOEXCEPT { return __deque_buf_size(sizeof(_Tp)); } typedef std::random_access_iterator_tag iterator_category; typedef _Tp value_type; typedef _Ptr pointer; typedef _Ref reference; typedef size_t size_type; typedef ptrdiff_t difference_type; typedef _Deque_iterator _Self; _Elt_pointer _M_cur; _Elt_pointer _M_first; _Elt_pointer _M_last; _Map_pointer _M_node; _Deque_iterator(_Elt_pointer __x, _Map_pointer __y) _GLIBCXX_NOEXCEPT : _M_cur(__x), _M_first(*__y), _M_last(*__y + _S_buffer_size()), _M_node(__y) { } _Deque_iterator() _GLIBCXX_NOEXCEPT : _M_cur(), _M_first(), _M_last(), _M_node() { } #if __cplusplus < 201103L // Conversion from iterator to const_iterator. _Deque_iterator(const iterator& __x) _GLIBCXX_NOEXCEPT : _M_cur(__x._M_cur), _M_first(__x._M_first), _M_last(__x._M_last), _M_node(__x._M_node) { } #else // Conversion from iterator to const_iterator. template<typename _Iter, typename = _Require<is_same<_Self, const_iterator>, is_same<_Iter, iterator>>> _Deque_iterator(const _Iter& __x) noexcept : _M_cur(__x._M_cur), _M_first(__x._M_first), _M_last(__x._M_last), _M_node(__x._M_node) { } _Deque_iterator(const _Deque_iterator& __x) noexcept : _M_cur(__x._M_cur), _M_first(__x._M_first), _M_last(__x._M_last), _M_node(__x._M_node) { } _Deque_iterator& operator=(const _Deque_iterator&) = default; #endif iterator _M_const_cast() const _GLIBCXX_NOEXCEPT { return iterator(_M_cur, _M_node); } reference operator*() const _GLIBCXX_NOEXCEPT { return *_M_cur; } pointer operator->() const _GLIBCXX_NOEXCEPT { return _M_cur; } _Self& operator++() _GLIBCXX_NOEXCEPT { ++_M_cur; if (_M_cur == _M_last) { _M_set_node(_M_node + 1); _M_cur = _M_first; } return *this; } _Self operator++(int) _GLIBCXX_NOEXCEPT { _Self __tmp = *this; ++*this; return __tmp; } _Self& operator--() _GLIBCXX_NOEXCEPT { if (_M_cur == _M_first) { _M_set_node(_M_node - 1); _M_cur = _M_last; } --_M_cur; return *this; } _Self operator--(int) _GLIBCXX_NOEXCEPT { _Self __tmp = *this; --*this; return __tmp; } _Self& operator+=(difference_type __n) _GLIBCXX_NOEXCEPT { const difference_type __offset = __n + (_M_cur - _M_first); if (__offset >= 0 && __offset < difference_type(_S_buffer_size())) _M_cur += __n; else { const difference_type __node_offset = __offset > 0 ? __offset / difference_type(_S_buffer_size()) : -difference_type((-__offset - 1) / _S_buffer_size()) - 1; _M_set_node(_M_node + __node_offset); _M_cur = _M_first + (__offset - __node_offset * difference_type(_S_buffer_size())); } return *this; } _Self operator+(difference_type __n) const _GLIBCXX_NOEXCEPT { _Self __tmp = *this; return __tmp += __n; } _Self& operator-=(difference_type __n) _GLIBCXX_NOEXCEPT { return *this += -__n; } _Self operator-(difference_type __n) const _GLIBCXX_NOEXCEPT { _Self __tmp = *this; return __tmp -= __n; } reference operator[](difference_type __n) const _GLIBCXX_NOEXCEPT { return *(*this + __n); } /** * Prepares to traverse new_node. Sets everything except * _M_cur, which should therefore be set by the caller * immediately afterwards, based on _M_first and _M_last. */ void _M_set_node(_Map_pointer __new_node) _GLIBCXX_NOEXCEPT { _M_node = __new_node; _M_first = *__new_node; _M_last = _M_first + difference_type(_S_buffer_size()); } }; // Note: we also provide overloads whose operands are of the same type in // order to avoid ambiguous overload resolution when std::rel_ops operators // are in scope (for additional details, see libstdc++/3628) template<typename _Tp, typename _Ref, typename _Ptr> inline bool operator==(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x, const _Deque_iterator<_Tp, _Ref, _Ptr>& __y) _GLIBCXX_NOEXCEPT { return __x._M_cur == __y._M_cur; } template<typename _Tp, typename _RefL, typename _PtrL, typename _RefR, typename _PtrR> inline bool operator==(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x, const _Deque_iterator<_Tp, _RefR, _PtrR>& __y) _GLIBCXX_NOEXCEPT { return __x._M_cur == __y._M_cur; } template<typename _Tp, typename _Ref, typename _Ptr> inline bool operator!=(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x, const _Deque_iterator<_Tp, _Ref, _Ptr>& __y) _GLIBCXX_NOEXCEPT { return !(__x == __y); } template<typename _Tp, typename _RefL, typename _PtrL, typename _RefR, typename _PtrR> inline bool operator!=(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x, const _Deque_iterator<_Tp, _RefR, _PtrR>& __y) _GLIBCXX_NOEXCEPT { return !(__x == __y); } template<typename _Tp, typename _Ref, typename _Ptr> inline bool operator<(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x, const _Deque_iterator<_Tp, _Ref, _Ptr>& __y) _GLIBCXX_NOEXCEPT { return (__x._M_node == __y._M_node) ? (__x._M_cur < __y._M_cur) : (__x._M_node < __y._M_node); } template<typename _Tp, typename _RefL, typename _PtrL, typename _RefR, typename _PtrR> inline bool operator<(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x, const _Deque_iterator<_Tp, _RefR, _PtrR>& __y) _GLIBCXX_NOEXCEPT { return (__x._M_node == __y._M_node) ? (__x._M_cur < __y._M_cur) : (__x._M_node < __y._M_node); } template<typename _Tp, typename _Ref, typename _Ptr> inline bool operator>(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x, const _Deque_iterator<_Tp, _Ref, _Ptr>& __y) _GLIBCXX_NOEXCEPT { return __y < __x; } template<typename _Tp, typename _RefL, typename _PtrL, typename _RefR, typename _PtrR> inline bool operator>(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x, const _Deque_iterator<_Tp, _RefR, _PtrR>& __y) _GLIBCXX_NOEXCEPT { return __y < __x; } template<typename _Tp, typename _Ref, typename _Ptr> inline bool operator<=(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x, const _Deque_iterator<_Tp, _Ref, _Ptr>& __y) _GLIBCXX_NOEXCEPT { return !(__y < __x); } template<typename _Tp, typename _RefL, typename _PtrL, typename _RefR, typename _PtrR> inline bool operator<=(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x, const _Deque_iterator<_Tp, _RefR, _PtrR>& __y) _GLIBCXX_NOEXCEPT { return !(__y < __x); } template<typename _Tp, typename _Ref, typename _Ptr> inline bool operator>=(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x, const _Deque_iterator<_Tp, _Ref, _Ptr>& __y) _GLIBCXX_NOEXCEPT { return !(__x < __y); } template<typename _Tp, typename _RefL, typename _PtrL, typename _RefR, typename _PtrR> inline bool operator>=(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x, const _Deque_iterator<_Tp, _RefR, _PtrR>& __y) _GLIBCXX_NOEXCEPT { return !(__x < __y); } // _GLIBCXX_RESOLVE_LIB_DEFECTS // According to the resolution of DR179 not only the various comparison // operators but also operator- must accept mixed iterator/const_iterator // parameters. template<typename _Tp, typename _Ref, typename _Ptr> inline typename _Deque_iterator<_Tp, _Ref, _Ptr>::difference_type operator-(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x, const _Deque_iterator<_Tp, _Ref, _Ptr>& __y) _GLIBCXX_NOEXCEPT { return typename _Deque_iterator<_Tp, _Ref, _Ptr>::difference_type (_Deque_iterator<_Tp, _Ref, _Ptr>::_S_buffer_size()) * (__x._M_node - __y._M_node - 1) + (__x._M_cur - __x._M_first) + (__y._M_last - __y._M_cur); } template<typename _Tp, typename _RefL, typename _PtrL, typename _RefR, typename _PtrR> inline typename _Deque_iterator<_Tp, _RefL, _PtrL>::difference_type operator-(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x, const _Deque_iterator<_Tp, _RefR, _PtrR>& __y) _GLIBCXX_NOEXCEPT { return typename _Deque_iterator<_Tp, _RefL, _PtrL>::difference_type (_Deque_iterator<_Tp, _RefL, _PtrL>::_S_buffer_size()) * (__x._M_node - __y._M_node - 1) + (__x._M_cur - __x._M_first) + (__y._M_last - __y._M_cur); } template<typename _Tp, typename _Ref, typename _Ptr> inline _Deque_iterator<_Tp, _Ref, _Ptr> operator+(ptrdiff_t __n, const _Deque_iterator<_Tp, _Ref, _Ptr>& __x) _GLIBCXX_NOEXCEPT { return __x + __n; } template<typename _Tp> void fill(const _Deque_iterator<_Tp, _Tp&, _Tp*>&, const _Deque_iterator<_Tp, _Tp&, _Tp*>&, const _Tp&); template<typename _Tp> _Deque_iterator<_Tp, _Tp&, _Tp*> copy(_Deque_iterator<_Tp, const _Tp&, const _Tp*>, _Deque_iterator<_Tp, const _Tp&, const _Tp*>, _Deque_iterator<_Tp, _Tp&, _Tp*>); template<typename _Tp> inline _Deque_iterator<_Tp, _Tp&, _Tp*> copy(_Deque_iterator<_Tp, _Tp&, _Tp*> __first, _Deque_iterator<_Tp, _Tp&, _Tp*> __last, _Deque_iterator<_Tp, _Tp&, _Tp*> __result) { return std::copy(_Deque_iterator<_Tp, const _Tp&, const _Tp*>(__first), _Deque_iterator<_Tp, const _Tp&, const _Tp*>(__last), __result); } template<typename _Tp> _Deque_iterator<_Tp, _Tp&, _Tp*> copy_backward(_Deque_iterator<_Tp, const _Tp&, const _Tp*>, _Deque_iterator<_Tp, const _Tp&, const _Tp*>, _Deque_iterator<_Tp, _Tp&, _Tp*>); template<typename _Tp> inline _Deque_iterator<_Tp, _Tp&, _Tp*> copy_backward(_Deque_iterator<_Tp, _Tp&, _Tp*> __first, _Deque_iterator<_Tp, _Tp&, _Tp*> __last, _Deque_iterator<_Tp, _Tp&, _Tp*> __result) { return std::copy_backward(_Deque_iterator<_Tp, const _Tp&, const _Tp*>(__first), _Deque_iterator<_Tp, const _Tp&, const _Tp*>(__last), __result); } #if __cplusplus >= 201103L template<typename _Tp> _Deque_iterator<_Tp, _Tp&, _Tp*> move(_Deque_iterator<_Tp, const _Tp&, const _Tp*>, _Deque_iterator<_Tp, const _Tp&, const _Tp*>, _Deque_iterator<_Tp, _Tp&, _Tp*>); template<typename _Tp> inline _Deque_iterator<_Tp, _Tp&, _Tp*> move(_Deque_iterator<_Tp, _Tp&, _Tp*> __first, _Deque_iterator<_Tp, _Tp&, _Tp*> __last, _Deque_iterator<_Tp, _Tp&, _Tp*> __result) { return std::move(_Deque_iterator<_Tp, const _Tp&, const _Tp*>(__first), _Deque_iterator<_Tp, const _Tp&, const _Tp*>(__last), __result); } template<typename _Tp> _Deque_iterator<_Tp, _Tp&, _Tp*> move_backward(_Deque_iterator<_Tp, const _Tp&, const _Tp*>, _Deque_iterator<_Tp, const _Tp&, const _Tp*>, _Deque_iterator<_Tp, _Tp&, _Tp*>); template<typename _Tp> inline _Deque_iterator<_Tp, _Tp&, _Tp*> move_backward(_Deque_iterator<_Tp, _Tp&, _Tp*> __first, _Deque_iterator<_Tp, _Tp&, _Tp*> __last, _Deque_iterator<_Tp, _Tp&, _Tp*> __result) { return std::move_backward(_Deque_iterator<_Tp, const _Tp&, const _Tp*>(__first), _Deque_iterator<_Tp, const _Tp&, const _Tp*>(__last), __result); } #endif /** * Deque base class. This class provides the unified face for %deque's * allocation. This class's constructor and destructor allocate and * deallocate (but do not initialize) storage. This makes %exception * safety easier. * * Nothing in this class ever constructs or destroys an actual Tp element. * (Deque handles that itself.) Only/All memory management is performed * here. */ template<typename _Tp, typename _Alloc> class _Deque_base { protected: typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template rebind<_Tp>::other _Tp_alloc_type; typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Alloc_traits; #if __cplusplus < 201103L typedef _Tp* _Ptr; typedef const _Tp* _Ptr_const; #else typedef typename _Alloc_traits::pointer _Ptr; typedef typename _Alloc_traits::const_pointer _Ptr_const; #endif typedef typename _Alloc_traits::template rebind<_Ptr>::other _Map_alloc_type; typedef __gnu_cxx::__alloc_traits<_Map_alloc_type> _Map_alloc_traits; public: typedef _Alloc allocator_type; allocator_type get_allocator() const _GLIBCXX_NOEXCEPT { return allocator_type(_M_get_Tp_allocator()); } typedef _Deque_iterator<_Tp, _Tp&, _Ptr> iterator; typedef _Deque_iterator<_Tp, const _Tp&, _Ptr_const> const_iterator; _Deque_base() : _M_impl() { _M_initialize_map(0); } _Deque_base(size_t __num_elements) : _M_impl() { _M_initialize_map(__num_elements); } _Deque_base(const allocator_type& __a, size_t __num_elements) : _M_impl(__a) { _M_initialize_map(__num_elements); } _Deque_base(const allocator_type& __a) : _M_impl(__a) { /* Caller must initialize map. */ } #if __cplusplus >= 201103L _Deque_base(_Deque_base&& __x, false_type) : _M_impl(__x._M_move_impl()) { } _Deque_base(_Deque_base&& __x, true_type) : _M_impl(std::move(__x._M_get_Tp_allocator())) { _M_initialize_map(0); if (__x._M_impl._M_map) this->_M_impl._M_swap_data(__x._M_impl); } _Deque_base(_Deque_base&& __x) : _Deque_base(std::move(__x), typename _Alloc_traits::is_always_equal{}) { } _Deque_base(_Deque_base&& __x, const allocator_type& __a, size_t __n) : _M_impl(__a) { if (__x.get_allocator() == __a) { if (__x._M_impl._M_map) { _M_initialize_map(0); this->_M_impl._M_swap_data(__x._M_impl); } } else { _M_initialize_map(__n); } } #endif ~_Deque_base() _GLIBCXX_NOEXCEPT; protected: typedef typename iterator::_Map_pointer _Map_pointer; //This struct encapsulates the implementation of the std::deque //standard container and at the same time makes use of the EBO //for empty allocators. struct _Deque_impl : public _Tp_alloc_type { _Map_pointer _M_map; size_t _M_map_size; iterator _M_start; iterator _M_finish; _Deque_impl() : _Tp_alloc_type(), _M_map(), _M_map_size(0), _M_start(), _M_finish() { } _Deque_impl(const _Tp_alloc_type& __a) _GLIBCXX_NOEXCEPT : _Tp_alloc_type(__a), _M_map(), _M_map_size(0), _M_start(), _M_finish() { } #if __cplusplus >= 201103L _Deque_impl(_Deque_impl&&) = default; _Deque_impl(_Tp_alloc_type&& __a) noexcept : _Tp_alloc_type(std::move(__a)), _M_map(), _M_map_size(0), _M_start(), _M_finish() { } #endif void _M_swap_data(_Deque_impl& __x) _GLIBCXX_NOEXCEPT { using std::swap; swap(this->_M_start, __x._M_start); swap(this->_M_finish, __x._M_finish); swap(this->_M_map, __x._M_map); swap(this->_M_map_size, __x._M_map_size); } }; _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); } _Map_alloc_type _M_get_map_allocator() const _GLIBCXX_NOEXCEPT { return _Map_alloc_type(_M_get_Tp_allocator()); } _Ptr _M_allocate_node() { typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Traits; return _Traits::allocate(_M_impl, __deque_buf_size(sizeof(_Tp))); } void _M_deallocate_node(_Ptr __p) _GLIBCXX_NOEXCEPT { typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Traits; _Traits::deallocate(_M_impl, __p, __deque_buf_size(sizeof(_Tp))); } _Map_pointer _M_allocate_map(size_t __n) { _Map_alloc_type __map_alloc = _M_get_map_allocator(); return _Map_alloc_traits::allocate(__map_alloc, __n); } void _M_deallocate_map(_Map_pointer __p, size_t __n) _GLIBCXX_NOEXCEPT { _Map_alloc_type __map_alloc = _M_get_map_allocator(); _Map_alloc_traits::deallocate(__map_alloc, __p, __n); } protected: void _M_initialize_map(size_t); void _M_create_nodes(_Map_pointer __nstart, _Map_pointer __nfinish); void _M_destroy_nodes(_Map_pointer __nstart, _Map_pointer __nfinish) _GLIBCXX_NOEXCEPT; enum { _S_initial_map_size = 8 }; _Deque_impl _M_impl; #if __cplusplus >= 201103L private: _Deque_impl _M_move_impl() { if (!_M_impl._M_map) return std::move(_M_impl); // Create a copy of the current allocator. _Tp_alloc_type __alloc{_M_get_Tp_allocator()}; // Put that copy in a moved-from state. _Tp_alloc_type __sink __attribute((__unused__)) {std::move(__alloc)}; // Create an empty map that allocates using the moved-from allocator. _Deque_base __empty{__alloc}; __empty._M_initialize_map(0); // Now safe to modify current allocator and perform non-throwing swaps. _Deque_impl __ret{std::move(_M_get_Tp_allocator())}; _M_impl._M_swap_data(__ret); _M_impl._M_swap_data(__empty._M_impl); return __ret; } #endif }; template<typename _Tp, typename _Alloc> _Deque_base<_Tp, _Alloc>:: ~_Deque_base() _GLIBCXX_NOEXCEPT { if (this->_M_impl._M_map) { _M_destroy_nodes(this->_M_impl._M_start._M_node, this->_M_impl._M_finish._M_node + 1); _M_deallocate_map(this->_M_impl._M_map, this->_M_impl._M_map_size); } } /** * @brief Layout storage. * @param __num_elements The count of T's for which to allocate space * at first. * @return Nothing. * * The initial underlying memory layout is a bit complicated... */ template<typename _Tp, typename _Alloc> void _Deque_base<_Tp, _Alloc>:: _M_initialize_map(size_t __num_elements) { const size_t __num_nodes = (__num_elements/ __deque_buf_size(sizeof(_Tp)) + 1); this->_M_impl._M_map_size = std::max((size_t) _S_initial_map_size, size_t(__num_nodes + 2)); this->_M_impl._M_map = _M_allocate_map(this->_M_impl._M_map_size); // For "small" maps (needing less than _M_map_size nodes), allocation // starts in the middle elements and grows outwards. So nstart may be // the beginning of _M_map, but for small maps it may be as far in as // _M_map+3. _Map_pointer __nstart = (this->_M_impl._M_map + (this->_M_impl._M_map_size - __num_nodes) / 2); _Map_pointer __nfinish = __nstart + __num_nodes; __try { _M_create_nodes(__nstart, __nfinish); } __catch(...) { _M_deallocate_map(this->_M_impl._M_map, this->_M_impl._M_map_size); this->_M_impl._M_map = _Map_pointer(); this->_M_impl._M_map_size = 0; __throw_exception_again; } this->_M_impl._M_start._M_set_node(__nstart); this->_M_impl._M_finish._M_set_node(__nfinish - 1); this->_M_impl._M_start._M_cur = _M_impl._M_start._M_first; this->_M_impl._M_finish._M_cur = (this->_M_impl._M_finish._M_first + __num_elements % __deque_buf_size(sizeof(_Tp))); } template<typename _Tp, typename _Alloc> void _Deque_base<_Tp, _Alloc>:: _M_create_nodes(_Map_pointer __nstart, _Map_pointer __nfinish) { _Map_pointer __cur; __try { for (__cur = __nstart; __cur < __nfinish; ++__cur) *__cur = this->_M_allocate_node(); } __catch(...) { _M_destroy_nodes(__nstart, __cur); __throw_exception_again; } } template<typename _Tp, typename _Alloc> void _Deque_base<_Tp, _Alloc>:: _M_destroy_nodes(_Map_pointer __nstart, _Map_pointer __nfinish) _GLIBCXX_NOEXCEPT { for (_Map_pointer __n = __nstart; __n < __nfinish; ++__n) _M_deallocate_node(*__n); } /** * @brief A standard container using fixed-size memory allocation and * constant-time manipulation of elements at either end. * * @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>. * * In previous HP/SGI versions of deque, there was an extra template * parameter so users could control the node size. This extension turned * out to violate the C++ standard (it can be detected using template * template parameters), and it was removed. * * Here's how a deque<Tp> manages memory. Each deque has 4 members: * * - Tp** _M_map * - size_t _M_map_size * - iterator _M_start, _M_finish * * map_size is at least 8. %map is an array of map_size * pointers-to-@a nodes. (The name %map has nothing to do with the * std::map class, and @b nodes should not be confused with * std::list's usage of @a node.) * * A @a node has no specific type name as such, but it is referred * to as @a node in this file. It is a simple array-of-Tp. If Tp * is very large, there will be one Tp element per node (i.e., an * @a array of one). For non-huge Tp's, node size is inversely * related to Tp size: the larger the Tp, the fewer Tp's will fit * in a node. The goal here is to keep the total size of a node * relatively small and constant over different Tp's, to improve * allocator efficiency. * * Not every pointer in the %map array will point to a node. If * the initial number of elements in the deque is small, the * /middle/ %map pointers will be valid, and the ones at the edges * will be unused. This same situation will arise as the %map * grows: available %map pointers, if any, will be on the ends. As * new nodes are created, only a subset of the %map's pointers need * to be copied @a outward. * * Class invariants: * - For any nonsingular iterator i: * - i.node points to a member of the %map array. (Yes, you read that * correctly: i.node does not actually point to a node.) The member of * the %map array is what actually points to the node. * - i.first == *(i.node) (This points to the node (first Tp element).) * - i.last == i.first + node_size * - i.cur is a pointer in the range [i.first, i.last). NOTE: * the implication of this is that i.cur is always a dereferenceable * pointer, even if i is a past-the-end iterator. * - Start and Finish are always nonsingular iterators. NOTE: this * means that an empty deque must have one node, a deque with <N * elements (where N is the node buffer size) must have one node, a * deque with N through (2N-1) elements must have two nodes, etc. * - For every node other than start.node and finish.node, every * element in the node is an initialized object. If start.node == * finish.node, then [start.cur, finish.cur) are initialized * objects, and the elements outside that range are uninitialized * storage. Otherwise, [start.cur, start.last) and [finish.first, * finish.cur) are initialized objects, and [start.first, start.cur) * and [finish.cur, finish.last) are uninitialized storage. * - [%map, %map + map_size) is a valid, non-empty range. * - [start.node, finish.node] is a valid range contained within * [%map, %map + map_size). * - A pointer in the range [%map, %map + map_size) points to an allocated * node if and only if the pointer is in the range * [start.node, finish.node]. * * Here's the magic: nothing in deque is @b aware of the discontiguous * storage! * * The memory setup and layout occurs in the parent, _Base, and the iterator * class is entirely responsible for @a leaping from one node to the next. * All the implementation routines for deque itself work only through the * start and finish iterators. This keeps the routines simple and sane, * and we can use other standard algorithms as well. */ template<typename _Tp, typename _Alloc = std::allocator<_Tp> > class deque : protected _Deque_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::deque must have a non-const, non-volatile value_type"); # ifdef __STRICT_ANSI__ static_assert(is_same<typename _Alloc::value_type, _Tp>::value, "std::deque must have the same value_type as its allocator"); # endif #endif typedef _Deque_base<_Tp, _Alloc> _Base; typedef typename _Base::_Tp_alloc_type _Tp_alloc_type; typedef typename _Base::_Alloc_traits _Alloc_traits; typedef typename _Base::_Map_pointer _Map_pointer; public: typedef _Tp value_type; typedef typename _Alloc_traits::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 typename _Base::iterator iterator; typedef typename _Base::const_iterator 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: static size_t _S_buffer_size() _GLIBCXX_NOEXCEPT { return __deque_buf_size(sizeof(_Tp)); } // Functions controlling memory layout, and nothing else. using _Base::_M_initialize_map; using _Base::_M_create_nodes; using _Base::_M_destroy_nodes; using _Base::_M_allocate_node; using _Base::_M_deallocate_node; using _Base::_M_allocate_map; using _Base::_M_deallocate_map; using _Base::_M_get_Tp_allocator; /** * A total of four data members accumulated down the hierarchy. * May be accessed via _M_impl.* */ using _Base::_M_impl; public: // [23.2.1.1] construct/copy/destroy // (assign() and get_allocator() are also listed in this section) /** * @brief Creates a %deque with no elements. */ deque() : _Base() { } /** * @brief Creates a %deque with no elements. * @param __a An allocator object. */ explicit deque(const allocator_type& __a) : _Base(__a, 0) { } #if __cplusplus >= 201103L /** * @brief Creates a %deque with default constructed elements. * @param __n The number of elements to initially create. * @param __a An allocator. * * This constructor fills the %deque with @a n default * constructed elements. */ explicit deque(size_type __n, const allocator_type& __a = allocator_type()) : _Base(__a, _S_check_init_len(__n, __a)) { _M_default_initialize(); } /** * @brief Creates a %deque 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 %deque with @a __n copies of @a __value. */ deque(size_type __n, const value_type& __value, const allocator_type& __a = allocator_type()) : _Base(__a, _S_check_init_len(__n, __a)) { _M_fill_initialize(__value); } #else /** * @brief Creates a %deque 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 %deque with @a __n copies of @a __value. */ explicit deque(size_type __n, const value_type& __value = value_type(), const allocator_type& __a = allocator_type()) : _Base(__a, _S_check_init_len(__n, __a)) { _M_fill_initialize(__value); } #endif /** * @brief %Deque copy constructor. * @param __x A %deque of identical element and allocator types. * * The newly-created %deque uses a copy of the allocator object used * by @a __x (unless the allocator traits dictate a different object). */ deque(const deque& __x) : _Base(_Alloc_traits::_S_select_on_copy(__x._M_get_Tp_allocator()), __x.size()) { std::__uninitialized_copy_a(__x.begin(), __x.end(), this->_M_impl._M_start, _M_get_Tp_allocator()); } #if __cplusplus >= 201103L /** * @brief %Deque move constructor. * @param __x A %deque of identical element and allocator types. * * The newly-created %deque contains the exact contents of @a __x. * The contents of @a __x are a valid, but unspecified %deque. */ deque(deque&& __x) : _Base(std::move(__x)) { } /// Copy constructor with alternative allocator deque(const deque& __x, const allocator_type& __a) : _Base(__a, __x.size()) { std::__uninitialized_copy_a(__x.begin(), __x.end(), this->_M_impl._M_start, _M_get_Tp_allocator()); } /// Move constructor with alternative allocator deque(deque&& __x, const allocator_type& __a) : _Base(std::move(__x), __a, __x.size()) { if (__x.get_allocator() != __a) { std::__uninitialized_move_a(__x.begin(), __x.end(), this->_M_impl._M_start, _M_get_Tp_allocator()); __x.clear(); } } /** * @brief Builds a %deque from an initializer list. * @param __l An initializer_list. * @param __a An allocator object. * * Create a %deque 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 __l.size()) and do no memory reallocation. */ deque(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 %deque from a range. * @param __first An input iterator. * @param __last An input iterator. * @param __a An allocator object. * * Create a %deque 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>> deque(_InputIterator __first, _InputIterator __last, const allocator_type& __a = allocator_type()) : _Base(__a) { _M_initialize_dispatch(__first, __last, __false_type()); } #else template<typename _InputIterator> deque(_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. */ ~deque() { _M_destroy_data(begin(), end(), _M_get_Tp_allocator()); } /** * @brief %Deque assignment operator. * @param __x A %deque of identical element and allocator types. * * All the elements of @a x are copied. * * The newly-created %deque uses a copy of the allocator object used * by @a __x (unless the allocator traits dictate a different object). */ deque& operator=(const deque& __x); #if __cplusplus >= 201103L /** * @brief %Deque move assignment operator. * @param __x A %deque of identical element and allocator types. * * The contents of @a __x are moved into this deque (without copying, * if the allocators permit it). * @a __x is a valid, but unspecified %deque. */ deque& operator=(deque&& __x) noexcept(_Alloc_traits::_S_always_equal()) { using __always_equal = typename _Alloc_traits::is_always_equal; _M_move_assign1(std::move(__x), __always_equal{}); return *this; } /** * @brief Assigns an initializer list to a %deque. * @param __l An initializer_list. * * This function fills a %deque with copies of the elements in the * initializer_list @a __l. * * Note that the assignment completely changes the %deque and that the * resulting %deque's size is the same as the number of elements * assigned. */ deque& operator=(initializer_list<value_type> __l) { _M_assign_aux(__l.begin(), __l.end(), random_access_iterator_tag()); return *this; } #endif /** * @brief Assigns a given value to a %deque. * @param __n Number of elements to be assigned. * @param __val Value to be assigned. * * This function fills a %deque with @a n copies of the given * value. Note that the assignment completely changes the * %deque and that the resulting %deque'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 %deque. * @param __first An input iterator. * @param __last An input iterator. * * This function fills a %deque with copies of the elements in the * range [__first,__last). * * Note that the assignment completely changes the %deque and that the * resulting %deque'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) { 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 %deque. * @param __l An initializer_list. * * This function fills a %deque with copies of the elements in the * initializer_list @a __l. * * Note that the assignment completely changes the %deque and that the * resulting %deque's size is the same as the number of elements * assigned. */ void assign(initializer_list<value_type> __l) { _M_assign_aux(__l.begin(), __l.end(), random_access_iterator_tag()); } #endif /// Get a copy of the memory allocation object. allocator_type get_allocator() const _GLIBCXX_NOEXCEPT { return _Base::get_allocator(); } // iterators /** * Returns a read/write iterator that points to the first element in the * %deque. Iteration is done in ordinary element order. */ iterator begin() _GLIBCXX_NOEXCEPT { return this->_M_impl._M_start; } /** * Returns a read-only (constant) iterator that points to the first * element in the %deque. Iteration is done in ordinary element order. */ const_iterator begin() const _GLIBCXX_NOEXCEPT { return this->_M_impl._M_start; } /** * Returns a read/write iterator that points one past the last * element in the %deque. Iteration is done in ordinary * element order. */ iterator end() _GLIBCXX_NOEXCEPT { return this->_M_impl._M_finish; } /** * Returns a read-only (constant) iterator that points one past * the last element in the %deque. Iteration is done in * ordinary element order. */ const_iterator end() const _GLIBCXX_NOEXCEPT { return this->_M_impl._M_finish; } /** * Returns a read/write reverse iterator that points to the * last element in the %deque. Iteration is done in reverse * element order. */ reverse_iterator rbegin() _GLIBCXX_NOEXCEPT { return reverse_iterator(this->_M_impl._M_finish); } /** * Returns a read-only (constant) reverse iterator that points * to the last element in the %deque. Iteration is done in * reverse element order. */ const_reverse_iterator rbegin() const _GLIBCXX_NOEXCEPT { return const_reverse_iterator(this->_M_impl._M_finish); } /** * Returns a read/write reverse iterator that points to one * before the first element in the %deque. Iteration is done * in reverse element order. */ reverse_iterator rend() _GLIBCXX_NOEXCEPT { return reverse_iterator(this->_M_impl._M_start); } /** * Returns a read-only (constant) reverse iterator that points * to one before the first element in the %deque. Iteration is * done in reverse element order. */ const_reverse_iterator rend() const _GLIBCXX_NOEXCEPT { return const_reverse_iterator(this->_M_impl._M_start); } #if __cplusplus >= 201103L /** * Returns a read-only (constant) iterator that points to the first * element in the %deque. Iteration is done in ordinary element order. */ const_iterator cbegin() const noexcept { return this->_M_impl._M_start; } /** * Returns a read-only (constant) iterator that points one past * the last element in the %deque. Iteration is done in * ordinary element order. */ const_iterator cend() const noexcept { return this->_M_impl._M_finish; } /** * Returns a read-only (constant) reverse iterator that points * to the last element in the %deque. Iteration is done in * reverse element order. */ const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(this->_M_impl._M_finish); } /** * Returns a read-only (constant) reverse iterator that points * to one before the first element in the %deque. Iteration is * done in reverse element order. */ const_reverse_iterator crend() const noexcept { return const_reverse_iterator(this->_M_impl._M_start); } #endif // [23.2.1.2] capacity /** Returns the number of elements in the %deque. */ size_type size() const _GLIBCXX_NOEXCEPT { return this->_M_impl._M_finish - this->_M_impl._M_start; } /** Returns the size() of the largest possible %deque. */ size_type max_size() const _GLIBCXX_NOEXCEPT { return _S_max_size(_M_get_Tp_allocator()); } #if __cplusplus >= 201103L /** * @brief Resizes the %deque to the specified number of elements. * @param __new_size Number of elements the %deque should contain. * * This function will %resize the %deque to the specified * number of elements. If the number is smaller than the * %deque's current size the %deque is truncated, otherwise * default constructed elements are appended. */ void resize(size_type __new_size) { const size_type __len = size(); if (__new_size > __len) _M_default_append(__new_size - __len); else if (__new_size < __len) _M_erase_at_end(this->_M_impl._M_start + difference_type(__new_size)); } /** * @brief Resizes the %deque to the specified number of elements. * @param __new_size Number of elements the %deque should contain. * @param __x Data with which new elements should be populated. * * This function will %resize the %deque to the specified * number of elements. If the number is smaller than the * %deque's current size the %deque is truncated, otherwise the * %deque is extended and new elements are populated with given * data. */ void resize(size_type __new_size, const value_type& __x) { const size_type __len = size(); if (__new_size > __len) _M_fill_insert(this->_M_impl._M_finish, __new_size - __len, __x); else if (__new_size < __len) _M_erase_at_end(this->_M_impl._M_start + difference_type(__new_size)); } #else /** * @brief Resizes the %deque to the specified number of elements. * @param __new_size Number of elements the %deque should contain. * @param __x Data with which new elements should be populated. * * This function will %resize the %deque to the specified * number of elements. If the number is smaller than the * %deque's current size the %deque is truncated, otherwise the * %deque is extended and new elements are populated with given * data. */ void resize(size_type __new_size, value_type __x = value_type()) { const size_type __len = size(); if (__new_size > __len) _M_fill_insert(this->_M_impl._M_finish, __new_size - __len, __x); else if (__new_size < __len) _M_erase_at_end(this->_M_impl._M_start + difference_type(__new_size)); } #endif #if __cplusplus >= 201103L /** A non-binding request to reduce memory use. */ void shrink_to_fit() noexcept { _M_shrink_to_fit(); } #endif /** * Returns true if the %deque is empty. (Thus begin() would * equal end().) */ _GLIBCXX_NODISCARD bool empty() const _GLIBCXX_NOEXCEPT { return this->_M_impl._M_finish == this->_M_impl._M_start; } // element access /** * @brief Subscript access to the data contained in the %deque. * @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[difference_type(__n)]; } /** * @brief Subscript access to the data contained in the %deque. * @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[difference_type(__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("deque::_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 %deque. * @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 deque. 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 %deque. * @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 deque. 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 %deque. */ reference front() _GLIBCXX_NOEXCEPT { __glibcxx_requires_nonempty(); return *begin(); } /** * Returns a read-only (constant) reference to the data at the first * element of the %deque. */ 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 * %deque. */ reference back() _GLIBCXX_NOEXCEPT { __glibcxx_requires_nonempty(); iterator __tmp = end(); --__tmp; return *__tmp; } /** * Returns a read-only (constant) reference to the data at the last * element of the %deque. */ const_reference back() const _GLIBCXX_NOEXCEPT { __glibcxx_requires_nonempty(); const_iterator __tmp = end(); --__tmp; return *__tmp; } // [23.2.1.2] modifiers /** * @brief Add data to the front of the %deque. * @param __x Data to be added. * * This is a typical stack operation. The function creates an * element at the front of the %deque and assigns the given * data to it. Due to the nature of a %deque this operation * can be done in constant time. */ void push_front(const value_type& __x) { if (this->_M_impl._M_start._M_cur != this->_M_impl._M_start._M_first) { _Alloc_traits::construct(this->_M_impl, this->_M_impl._M_start._M_cur - 1, __x); --this->_M_impl._M_start._M_cur; } else _M_push_front_aux(__x); } #if __cplusplus >= 201103L void push_front(value_type&& __x) { emplace_front(std::move(__x)); } template<typename... _Args> #if __cplusplus > 201402L reference #else void #endif emplace_front(_Args&&... __args); #endif /** * @brief Add data to the end of the %deque. * @param __x Data to be added. * * This is a typical stack operation. The function creates an * element at the end of the %deque and assigns the given data * to it. Due to the nature of a %deque this operation can be * done in constant time. */ void push_back(const value_type& __x) { if (this->_M_impl._M_finish._M_cur != this->_M_impl._M_finish._M_last - 1) { _Alloc_traits::construct(this->_M_impl, this->_M_impl._M_finish._M_cur, __x); ++this->_M_impl._M_finish._M_cur; } else _M_push_back_aux(__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 first element. * * This is a typical stack operation. It shrinks the %deque by one. * * Note that no data is returned, and if the first element's data is * needed, it should be retrieved before pop_front() is called. */ void pop_front() _GLIBCXX_NOEXCEPT { __glibcxx_requires_nonempty(); if (this->_M_impl._M_start._M_cur != this->_M_impl._M_start._M_last - 1) { _Alloc_traits::destroy(this->_M_impl, this->_M_impl._M_start._M_cur); ++this->_M_impl._M_start._M_cur; } else _M_pop_front_aux(); } /** * @brief Removes last element. * * This is a typical stack operation. It shrinks the %deque 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(); if (this->_M_impl._M_finish._M_cur != this->_M_impl._M_finish._M_first) { --this->_M_impl._M_finish._M_cur; _Alloc_traits::destroy(this->_M_impl, this->_M_impl._M_finish._M_cur); } else _M_pop_back_aux(); } #if __cplusplus >= 201103L /** * @brief Inserts an object in %deque before specified iterator. * @param __position A const_iterator into the %deque. * @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. */ template<typename... _Args> iterator emplace(const_iterator __position, _Args&&... __args); /** * @brief Inserts given value into %deque before specified iterator. * @param __position A const_iterator into the %deque. * @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. */ iterator insert(const_iterator __position, const value_type& __x); #else /** * @brief Inserts given value into %deque before specified iterator. * @param __position An iterator into the %deque. * @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. */ iterator insert(iterator __position, const value_type& __x); #endif #if __cplusplus >= 201103L /** * @brief Inserts given rvalue into %deque before specified iterator. * @param __position A const_iterator into the %deque. * @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. */ iterator insert(const_iterator __position, value_type&& __x) { return emplace(__position, std::move(__x)); } /** * @brief Inserts an initializer list into the %deque. * @param __p An iterator into the %deque. * @param __l An initializer_list. * * This function will insert copies of the data in the * initializer_list @a __l into the %deque before the location * specified by @a __p. This is known as <em>list insert</em>. */ iterator insert(const_iterator __p, initializer_list<value_type> __l) { auto __offset = __p - cbegin(); _M_range_insert_aux(__p._M_const_cast(), __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 %deque. * @param __position A const_iterator into the %deque. * @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. */ iterator insert(const_iterator __position, size_type __n, const value_type& __x) { difference_type __offset = __position - cbegin(); _M_fill_insert(__position._M_const_cast(), __n, __x); return begin() + __offset; } #else /** * @brief Inserts a number of copies of given data into the %deque. * @param __position An iterator into the %deque. * @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. */ 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 %deque. * @param __position A const_iterator into the %deque. * @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 %deque before the location specified * by @a __position. This is known as <em>range insert</em>. */ template<typename _InputIterator, typename = std::_RequireInputIter<_InputIterator>> iterator insert(const_iterator __position, _InputIterator __first, _InputIterator __last) { difference_type __offset = __position - cbegin(); _M_insert_dispatch(__position._M_const_cast(), __first, __last, __false_type()); return begin() + __offset; } #else /** * @brief Inserts a range into the %deque. * @param __position An iterator into the %deque. * @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 %deque before the location specified * by @a __position. This is known as <em>range insert</em>. */ 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 %deque by one. * * The user is 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) #else erase(iterator __position) #endif { return _M_erase(__position._M_const_cast()); } /** * @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 %deque accordingly. * * The user is 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) #else erase(iterator __first, iterator __last) #endif { return _M_erase(__first._M_const_cast(), __last._M_const_cast()); } /** * @brief Swaps data with another %deque. * @param __x A %deque of the same element and allocator types. * * This exchanges the elements between two deques in constant time. * (Four pointers, so it should be quite fast.) * Note that the global std::swap() function is specialized such that * std::swap(d1,d2) will feed to this function. * * Whether the allocators are swapped depends on the allocator traits. */ void swap(deque& __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 _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(begin()); } protected: // 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 __x, __true_type) { _M_initialize_map(_S_check_init_len(static_cast<size_type>(__n), _M_get_Tp_allocator())); _M_fill_initialize(__x); } static size_t _S_check_init_len(size_t __n, const allocator_type& __a) { if (__n > _S_max_size(__a)) __throw_length_error( __N("cannot create std::deque larger than max_size()")); return __n; } static size_type _S_max_size(const _Tp_alloc_type& __a) _GLIBCXX_NOEXCEPT { const size_t __diffmax = __gnu_cxx::__numeric_traits<ptrdiff_t>::__max; const size_t __allocmax = _Alloc_traits::max_size(__a); return (std::min)(__diffmax, __allocmax); } // called by the range constructor to implement [23.1.1]/9 template<typename _InputIterator> void _M_initialize_dispatch(_InputIterator __first, _InputIterator __last, __false_type) { _M_range_initialize(__first, __last, std::__iterator_category(__first)); } // called by the second initialize_dispatch above ///@{ /** * @brief Fills the deque with whatever is in [first,last). * @param __first An input iterator. * @param __last An input iterator. * @return Nothing. * * If the iterators are actually forward iterators (or better), then the * memory layout can be done all at once. Else we move forward using * push_back on each value from the iterator. */ template<typename _InputIterator> void _M_range_initialize(_InputIterator __first, _InputIterator __last, std::input_iterator_tag); // called by the second initialize_dispatch above template<typename _ForwardIterator> void _M_range_initialize(_ForwardIterator __first, _ForwardIterator __last, std::forward_iterator_tag); ///@} /** * @brief Fills the %deque with copies of value. * @param __value Initial value. * @return Nothing. * @pre _M_start and _M_finish have already been initialized, * but none of the %deque's elements have yet been constructed. * * This function is called only when the user provides an explicit size * (with or without an explicit exemplar value). */ void _M_fill_initialize(const value_type& __value); #if __cplusplus >= 201103L // called by deque(n). void _M_default_initialize(); #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) { const size_type __len = std::distance(__first, __last); if (__len > size()) { _ForwardIterator __mid = __first; std::advance(__mid, size()); std::copy(__first, __mid, begin()); _M_range_insert_aux(end(), __mid, __last, std::__iterator_category(__first)); } else _M_erase_at_end(std::copy(__first, __last, begin())); } // 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) { if (__n > size()) { std::fill(begin(), end(), __val); _M_fill_insert(end(), __n - size(), __val); } else { _M_erase_at_end(begin() + difference_type(__n)); std::fill(begin(), end(), __val); } } ///@{ /// Helper functions for push_* and pop_*. #if __cplusplus < 201103L void _M_push_back_aux(const value_type&); void _M_push_front_aux(const value_type&); #else template<typename... _Args> void _M_push_back_aux(_Args&&... __args); template<typename... _Args> void _M_push_front_aux(_Args&&... __args); #endif void _M_pop_back_aux(); void _M_pop_front_aux(); ///@} // Internal insert functions follow. The *_aux functions do the actual // insertion work when all shortcuts fail. // 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 __x, __true_type) { _M_fill_insert(__pos, __n, __x); } // 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_aux(__pos, __first, __last, std::__iterator_category(__first)); } // called by the second insert_dispatch above template<typename _InputIterator> void _M_range_insert_aux(iterator __pos, _InputIterator __first, _InputIterator __last, std::input_iterator_tag); // called by the second insert_dispatch above template<typename _ForwardIterator> void _M_range_insert_aux(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. Can use fill functions in optimal situations, // otherwise passes off to insert_aux(p,n,x). void _M_fill_insert(iterator __pos, size_type __n, const value_type& __x); // called by insert(p,x) #if __cplusplus < 201103L iterator _M_insert_aux(iterator __pos, const value_type& __x); #else template<typename... _Args> iterator _M_insert_aux(iterator __pos, _Args&&... __args); #endif // called by insert(p,n,x) via fill_insert void _M_insert_aux(iterator __pos, size_type __n, const value_type& __x); // called by range_insert_aux for forward iterators template<typename _ForwardIterator> void _M_insert_aux(iterator __pos, _ForwardIterator __first, _ForwardIterator __last, size_type __n); // Internal erase functions follow. void _M_destroy_data_aux(iterator __first, iterator __last); // Called by ~deque(). // NB: Doesn't deallocate the nodes. template<typename _Alloc1> void _M_destroy_data(iterator __first, iterator __last, const _Alloc1&) { _M_destroy_data_aux(__first, __last); } void _M_destroy_data(iterator __first, iterator __last, const std::allocator<_Tp>&) { if (!__has_trivial_destructor(value_type)) _M_destroy_data_aux(__first, __last); } // Called by erase(q1, q2). void _M_erase_at_begin(iterator __pos) { _M_destroy_data(begin(), __pos, _M_get_Tp_allocator()); _M_destroy_nodes(this->_M_impl._M_start._M_node, __pos._M_node); this->_M_impl._M_start = __pos; } // Called by erase(q1, q2), resize(), clear(), _M_assign_aux, // _M_fill_assign, operator=. void _M_erase_at_end(iterator __pos) { _M_destroy_data(__pos, end(), _M_get_Tp_allocator()); _M_destroy_nodes(__pos._M_node + 1, this->_M_impl._M_finish._M_node + 1); this->_M_impl._M_finish = __pos; } iterator _M_erase(iterator __pos); iterator _M_erase(iterator __first, iterator __last); #if __cplusplus >= 201103L // Called by resize(sz). void _M_default_append(size_type __n); bool _M_shrink_to_fit(); #endif ///@{ /// Memory-handling helpers for the previous internal insert functions. iterator _M_reserve_elements_at_front(size_type __n) { const size_type __vacancies = this->_M_impl._M_start._M_cur - this->_M_impl._M_start._M_first; if (__n > __vacancies) _M_new_elements_at_front(__n - __vacancies); return this->_M_impl._M_start - difference_type(__n); } iterator _M_reserve_elements_at_back(size_type __n) { const size_type __vacancies = (this->_M_impl._M_finish._M_last - this->_M_impl._M_finish._M_cur) - 1; if (__n > __vacancies) _M_new_elements_at_back(__n - __vacancies); return this->_M_impl._M_finish + difference_type(__n); } void _M_new_elements_at_front(size_type __new_elements); void _M_new_elements_at_back(size_type __new_elements); ///@} ///@{ /** * @brief Memory-handling helpers for the major %map. * * Makes sure the _M_map has space for new nodes. Does not * actually add the nodes. Can invalidate _M_map pointers. * (And consequently, %deque iterators.) */ void _M_reserve_map_at_back(size_type __nodes_to_add = 1) { if (__nodes_to_add + 1 > this->_M_impl._M_map_size - (this->_M_impl._M_finish._M_node - this->_M_impl._M_map)) _M_reallocate_map(__nodes_to_add, false); } void _M_reserve_map_at_front(size_type __nodes_to_add = 1) { if (__nodes_to_add > size_type(this->_M_impl._M_start._M_node - this->_M_impl._M_map)) _M_reallocate_map(__nodes_to_add, true); } void _M_reallocate_map(size_type __nodes_to_add, bool __add_at_front); ///@} #if __cplusplus >= 201103L // Constant-time, nothrow move assignment when source object's memory // can be moved because the allocators are equal. void _M_move_assign1(deque&& __x, /* always equal: */ true_type) noexcept { this->_M_impl._M_swap_data(__x._M_impl); __x.clear(); std::__alloc_on_move(_M_get_Tp_allocator(), __x._M_get_Tp_allocator()); } // When the allocators are not equal the operation could throw, because // we might need to allocate a new map for __x after moving from it // or we might need to allocate new elements for *this. void _M_move_assign1(deque&& __x, /* always equal: */ false_type) { constexpr bool __move_storage = _Alloc_traits::_S_propagate_on_move_assign(); _M_move_assign2(std::move(__x), __bool_constant<__move_storage>()); } // Destroy all elements and deallocate all memory, then replace // with elements created from __args. template<typename... _Args> void _M_replace_map(_Args&&... __args) { // Create new data first, so if allocation fails there are no effects. deque __newobj(std::forward<_Args>(__args)...); // Free existing storage using existing allocator. clear(); _M_deallocate_node(*begin()._M_node); // one node left after clear() _M_deallocate_map(this->_M_impl._M_map, this->_M_impl._M_map_size); this->_M_impl._M_map = nullptr; this->_M_impl._M_map_size = 0; // Take ownership of replacement memory. this->_M_impl._M_swap_data(__newobj._M_impl); } // Do move assignment when the allocator propagates. void _M_move_assign2(deque&& __x, /* propagate: */ true_type) { // Make a copy of the original allocator state. auto __alloc = __x._M_get_Tp_allocator(); // The allocator propagates so storage can be moved from __x, // leaving __x in a valid empty state with a moved-from allocator. _M_replace_map(std::move(__x)); // Move the corresponding allocator state too. _M_get_Tp_allocator() = std::move(__alloc); } // Do move assignment when it may not be possible to move source // object's memory, resulting in a linear-time operation. void _M_move_assign2(deque&& __x, /* propagate: */ false_type) { if (__x._M_get_Tp_allocator() == this->_M_get_Tp_allocator()) { // The allocators are equal so storage can be moved from __x, // leaving __x in a valid empty state with its current allocator. _M_replace_map(std::move(__x), __x.get_allocator()); } else { // The rvalue's allocator cannot be moved and is not equal, // so we need to individually move each element. _M_assign_aux(std::__make_move_if_noexcept_iterator(__x.begin()), std::__make_move_if_noexcept_iterator(__x.end()), std::random_access_iterator_tag()); __x.clear(); } } #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>> deque(_InputIterator, _InputIterator, _Allocator = _Allocator()) -> deque<_ValT, _Allocator>; #endif /** * @brief Deque equality comparison. * @param __x A %deque. * @param __y A %deque of the same type as @a __x. * @return True iff the size and elements of the deques are equal. * * This is an equivalence relation. It is linear in the size of the * deques. Deques are considered equivalent if their sizes are equal, * and if corresponding elements compare equal. */ template<typename _Tp, typename _Alloc> inline bool operator==(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y) { return __x.size() == __y.size() && std::equal(__x.begin(), __x.end(), __y.begin()); } /** * @brief Deque ordering relation. * @param __x A %deque. * @param __y A %deque 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 * deques. 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 deque<_Tp, _Alloc>& __x, const deque<_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 deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y) { return !(__x == __y); } /// Based on operator< template<typename _Tp, typename _Alloc> inline bool operator>(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y) { return __y < __x; } /// Based on operator< template<typename _Tp, typename _Alloc> inline bool operator<=(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y) { return !(__y < __x); } /// Based on operator< template<typename _Tp, typename _Alloc> inline bool operator>=(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y) { return !(__x < __y); } /// See std::deque::swap(). template<typename _Tp, typename _Alloc> inline void swap(deque<_Tp,_Alloc>& __x, deque<_Tp,_Alloc>& __y) _GLIBCXX_NOEXCEPT_IF(noexcept(__x.swap(__y))) { __x.swap(__y); } #undef _GLIBCXX_DEQUE_BUF_SIZE _GLIBCXX_END_NAMESPACE_CONTAINER #if __cplusplus >= 201103L // std::allocator is safe, but it is not the only allocator // for which this is valid. template<class _Tp> struct __is_bitwise_relocatable<_GLIBCXX_STD_C::deque<_Tp>> : true_type { }; #endif _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif /* _STL_DEQUE_H */