76a45931ab
libstdc++-v3/ChangeLog: PR libstdc++/103848 * include/bits/stl_deque.h (operator-): Do not use 0 as null pointer constant.
2386 lines
76 KiB
C++
2386 lines
76 KiB
C++
// Deque implementation -*- C++ -*-
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// Copyright (C) 2001-2022 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/*
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Hewlett-Packard Company makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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*
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* Copyright (c) 1997
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/** @file bits/stl_deque.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{deque}
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*/
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#ifndef _STL_DEQUE_H
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#define _STL_DEQUE_H 1
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#include <bits/concept_check.h>
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#include <bits/stl_iterator_base_types.h>
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#include <bits/stl_iterator_base_funcs.h>
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#if __cplusplus >= 201103L
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#include <initializer_list>
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#include <bits/stl_uninitialized.h> // for __is_bitwise_relocatable
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#endif
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#if __cplusplus > 201703L
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# include <compare>
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#endif
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#include <debug/assertions.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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_GLIBCXX_BEGIN_NAMESPACE_CONTAINER
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/**
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* @brief This function controls the size of memory nodes.
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* @param __size The size of an element.
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* @return The number (not byte size) of elements per node.
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*
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* This function started off as a compiler kludge from SGI, but
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* seems to be a useful wrapper around a repeated constant
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* expression. The @b 512 is tunable (and no other code needs to
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* change), but no investigation has been done since inheriting the
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* SGI code. Touch _GLIBCXX_DEQUE_BUF_SIZE only if you know what
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* you are doing, however: changing it breaks the binary
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* compatibility!!
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*/
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#ifndef _GLIBCXX_DEQUE_BUF_SIZE
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#define _GLIBCXX_DEQUE_BUF_SIZE 512
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#endif
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_GLIBCXX_CONSTEXPR inline size_t
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__deque_buf_size(size_t __size)
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{ return (__size < _GLIBCXX_DEQUE_BUF_SIZE
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? size_t(_GLIBCXX_DEQUE_BUF_SIZE / __size) : size_t(1)); }
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/**
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* @brief A deque::iterator.
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*
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* Quite a bit of intelligence here. Much of the functionality of
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* deque is actually passed off to this class. A deque holds two
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* of these internally, marking its valid range. Access to
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* elements is done as offsets of either of those two, relying on
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* operator overloading in this class.
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*
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* All the functions are op overloads except for _M_set_node.
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*/
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template<typename _Tp, typename _Ref, typename _Ptr>
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struct _Deque_iterator
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{
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#if __cplusplus < 201103L
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typedef _Deque_iterator<_Tp, _Tp&, _Tp*> iterator;
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typedef _Deque_iterator<_Tp, const _Tp&, const _Tp*> const_iterator;
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typedef _Tp* _Elt_pointer;
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typedef _Tp** _Map_pointer;
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#else
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private:
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template<typename _CvTp>
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using __iter = _Deque_iterator<_Tp, _CvTp&, __ptr_rebind<_Ptr, _CvTp>>;
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public:
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typedef __iter<_Tp> iterator;
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typedef __iter<const _Tp> const_iterator;
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typedef __ptr_rebind<_Ptr, _Tp> _Elt_pointer;
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typedef __ptr_rebind<_Ptr, _Elt_pointer> _Map_pointer;
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#endif
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static size_t _S_buffer_size() _GLIBCXX_NOEXCEPT
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{ return __deque_buf_size(sizeof(_Tp)); }
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typedef std::random_access_iterator_tag iterator_category;
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typedef _Tp value_type;
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typedef _Ptr pointer;
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typedef _Ref reference;
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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typedef _Deque_iterator _Self;
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_Elt_pointer _M_cur;
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_Elt_pointer _M_first;
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_Elt_pointer _M_last;
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_Map_pointer _M_node;
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_Deque_iterator(_Elt_pointer __x, _Map_pointer __y) _GLIBCXX_NOEXCEPT
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: _M_cur(__x), _M_first(*__y),
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_M_last(*__y + _S_buffer_size()), _M_node(__y) { }
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_Deque_iterator() _GLIBCXX_NOEXCEPT
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: _M_cur(), _M_first(), _M_last(), _M_node() { }
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#if __cplusplus < 201103L
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// Conversion from iterator to const_iterator.
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_Deque_iterator(const iterator& __x) _GLIBCXX_NOEXCEPT
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: _M_cur(__x._M_cur), _M_first(__x._M_first),
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_M_last(__x._M_last), _M_node(__x._M_node) { }
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#else
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// Conversion from iterator to const_iterator.
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template<typename _Iter,
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typename = _Require<is_same<_Self, const_iterator>,
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is_same<_Iter, iterator>>>
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_Deque_iterator(const _Iter& __x) noexcept
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: _M_cur(__x._M_cur), _M_first(__x._M_first),
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_M_last(__x._M_last), _M_node(__x._M_node) { }
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_Deque_iterator(const _Deque_iterator& __x) noexcept
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: _M_cur(__x._M_cur), _M_first(__x._M_first),
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_M_last(__x._M_last), _M_node(__x._M_node) { }
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_Deque_iterator& operator=(const _Deque_iterator&) = default;
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#endif
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iterator
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_M_const_cast() const _GLIBCXX_NOEXCEPT
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{ return iterator(_M_cur, _M_node); }
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_GLIBCXX_NODISCARD
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reference
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operator*() const _GLIBCXX_NOEXCEPT
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{ return *_M_cur; }
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_GLIBCXX_NODISCARD
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pointer
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operator->() const _GLIBCXX_NOEXCEPT
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{ return _M_cur; }
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_Self&
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operator++() _GLIBCXX_NOEXCEPT
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{
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++_M_cur;
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if (_M_cur == _M_last)
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{
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_M_set_node(_M_node + 1);
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_M_cur = _M_first;
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}
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return *this;
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}
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_Self
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operator++(int) _GLIBCXX_NOEXCEPT
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{
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_Self __tmp = *this;
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++*this;
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return __tmp;
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}
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_Self&
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operator--() _GLIBCXX_NOEXCEPT
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{
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if (_M_cur == _M_first)
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{
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_M_set_node(_M_node - 1);
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_M_cur = _M_last;
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}
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--_M_cur;
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return *this;
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}
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_Self
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operator--(int) _GLIBCXX_NOEXCEPT
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{
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_Self __tmp = *this;
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--*this;
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return __tmp;
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}
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_Self&
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operator+=(difference_type __n) _GLIBCXX_NOEXCEPT
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{
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const difference_type __offset = __n + (_M_cur - _M_first);
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if (__offset >= 0 && __offset < difference_type(_S_buffer_size()))
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_M_cur += __n;
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else
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{
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const difference_type __node_offset =
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__offset > 0 ? __offset / difference_type(_S_buffer_size())
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: -difference_type((-__offset - 1)
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/ _S_buffer_size()) - 1;
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_M_set_node(_M_node + __node_offset);
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_M_cur = _M_first + (__offset - __node_offset
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* difference_type(_S_buffer_size()));
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}
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return *this;
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}
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_Self&
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operator-=(difference_type __n) _GLIBCXX_NOEXCEPT
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{ return *this += -__n; }
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_GLIBCXX_NODISCARD
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reference
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operator[](difference_type __n) const _GLIBCXX_NOEXCEPT
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{ return *(*this + __n); }
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/**
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* Prepares to traverse new_node. Sets everything except
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* _M_cur, which should therefore be set by the caller
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* immediately afterwards, based on _M_first and _M_last.
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*/
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void
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_M_set_node(_Map_pointer __new_node) _GLIBCXX_NOEXCEPT
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{
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_M_node = __new_node;
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_M_first = *__new_node;
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_M_last = _M_first + difference_type(_S_buffer_size());
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}
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_GLIBCXX_NODISCARD
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friend bool
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operator==(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
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{ return __x._M_cur == __y._M_cur; }
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// Note: we also provide overloads whose operands are of the same type in
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// order to avoid ambiguous overload resolution when std::rel_ops
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// operators are in scope (for additional details, see libstdc++/3628)
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template<typename _RefR, typename _PtrR>
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_GLIBCXX_NODISCARD
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friend bool
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operator==(const _Self& __x,
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const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
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_GLIBCXX_NOEXCEPT
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{ return __x._M_cur == __y._M_cur; }
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#if __cpp_lib_three_way_comparison
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[[nodiscard]]
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friend strong_ordering
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operator<=>(const _Self& __x, const _Self& __y) noexcept
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{
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if (const auto __cmp = __x._M_node <=> __y._M_node; __cmp != 0)
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return __cmp;
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return __x._M_cur <=> __y._M_cur;
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}
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#else
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_GLIBCXX_NODISCARD
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friend bool
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operator!=(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
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{ return !(__x == __y); }
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template<typename _RefR, typename _PtrR>
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_GLIBCXX_NODISCARD
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friend bool
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operator!=(const _Self& __x,
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const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
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_GLIBCXX_NOEXCEPT
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{ return !(__x == __y); }
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_GLIBCXX_NODISCARD
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friend bool
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operator<(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
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{
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return (__x._M_node == __y._M_node)
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? (__x._M_cur < __y._M_cur) : (__x._M_node < __y._M_node);
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}
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template<typename _RefR, typename _PtrR>
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_GLIBCXX_NODISCARD
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friend bool
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operator<(const _Self& __x,
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const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
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_GLIBCXX_NOEXCEPT
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{
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return (__x._M_node == __y._M_node)
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? (__x._M_cur < __y._M_cur) : (__x._M_node < __y._M_node);
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}
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_GLIBCXX_NODISCARD
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friend bool
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operator>(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
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{ return __y < __x; }
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template<typename _RefR, typename _PtrR>
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_GLIBCXX_NODISCARD
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friend bool
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operator>(const _Self& __x,
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const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
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_GLIBCXX_NOEXCEPT
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{ return __y < __x; }
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_GLIBCXX_NODISCARD
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friend bool
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operator<=(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
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{ return !(__y < __x); }
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template<typename _RefR, typename _PtrR>
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_GLIBCXX_NODISCARD
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friend bool
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operator<=(const _Self& __x,
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const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
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_GLIBCXX_NOEXCEPT
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{ return !(__y < __x); }
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_GLIBCXX_NODISCARD
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friend bool
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operator>=(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
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{ return !(__x < __y); }
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template<typename _RefR, typename _PtrR>
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_GLIBCXX_NODISCARD
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friend bool
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operator>=(const _Self& __x,
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const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
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_GLIBCXX_NOEXCEPT
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{ return !(__x < __y); }
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#endif // three-way comparison
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_GLIBCXX_NODISCARD
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friend difference_type
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operator-(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
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{
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return difference_type(_S_buffer_size())
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* (__x._M_node - __y._M_node - bool(__x._M_node))
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+ (__x._M_cur - __x._M_first)
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+ (__y._M_last - __y._M_cur);
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}
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// According to the resolution of DR179 not only the various comparison
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// operators but also operator- must accept mixed iterator/const_iterator
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// parameters.
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template<typename _RefR, typename _PtrR>
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_GLIBCXX_NODISCARD
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friend difference_type
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operator-(const _Self& __x,
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const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
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_GLIBCXX_NOEXCEPT
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{
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return difference_type(_S_buffer_size())
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* (__x._M_node - __y._M_node - bool(__x._M_node))
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+ (__x._M_cur - __x._M_first)
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+ (__y._M_last - __y._M_cur);
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}
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_GLIBCXX_NODISCARD
|
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friend _Self
|
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operator+(const _Self& __x, difference_type __n) _GLIBCXX_NOEXCEPT
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{
|
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_Self __tmp = __x;
|
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__tmp += __n;
|
|
return __tmp;
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}
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|
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_GLIBCXX_NODISCARD
|
|
friend _Self
|
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operator-(const _Self& __x, difference_type __n) _GLIBCXX_NOEXCEPT
|
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{
|
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_Self __tmp = __x;
|
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__tmp -= __n;
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return __tmp;
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}
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|
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_GLIBCXX_NODISCARD
|
|
friend _Self
|
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operator+(difference_type __n, const _Self& __x) _GLIBCXX_NOEXCEPT
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|
{ return __x + __n; }
|
|
};
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|
|
/**
|
|
* 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
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|
* here.
|
|
*/
|
|
template<typename _Tp, typename _Alloc>
|
|
class _Deque_base
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|
{
|
|
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;
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|
|
|
#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
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|
|
typedef typename _Alloc_traits::template rebind<_Ptr>::other
|
|
_Map_alloc_type;
|
|
typedef __gnu_cxx::__alloc_traits<_Map_alloc_type> _Map_alloc_traits;
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|
|
typedef _Alloc allocator_type;
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|
|
allocator_type
|
|
get_allocator() const _GLIBCXX_NOEXCEPT
|
|
{ return allocator_type(_M_get_Tp_allocator()); }
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|
|
typedef _Deque_iterator<_Tp, _Tp&, _Ptr> iterator;
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|
typedef _Deque_iterator<_Tp, const _Tp&, _Ptr_const> const_iterator;
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|
|
_Deque_base()
|
|
: _M_impl()
|
|
{ _M_initialize_map(0); }
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|
|
_Deque_base(size_t __num_elements)
|
|
: _M_impl()
|
|
{ _M_initialize_map(__num_elements); }
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|
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_Deque_base(const allocator_type& __a, size_t __num_elements)
|
|
: _M_impl(__a)
|
|
{ _M_initialize_map(__num_elements); }
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|
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_Deque_base(const allocator_type& __a)
|
|
: _M_impl(__a)
|
|
{ /* Caller must initialize map. */ }
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|
|
#if __cplusplus >= 201103L
|
|
_Deque_base(_Deque_base&& __x)
|
|
: _M_impl(std::move(__x._M_get_Tp_allocator()))
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|
{
|
|
_M_initialize_map(0);
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|
if (__x._M_impl._M_map)
|
|
this->_M_impl._M_swap_data(__x._M_impl);
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|
}
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|
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_Deque_base(_Deque_base&& __x, const allocator_type& __a)
|
|
: _M_impl(std::move(__x._M_impl), _Tp_alloc_type(__a))
|
|
{ __x._M_initialize_map(0); }
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|
|
_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;
|
|
|
|
typedef typename iterator::_Map_pointer _Map_pointer;
|
|
|
|
struct _Deque_impl_data
|
|
{
|
|
_Map_pointer _M_map;
|
|
size_t _M_map_size;
|
|
iterator _M_start;
|
|
iterator _M_finish;
|
|
|
|
_Deque_impl_data() _GLIBCXX_NOEXCEPT
|
|
: _M_map(), _M_map_size(), _M_start(), _M_finish()
|
|
{ }
|
|
|
|
#if __cplusplus >= 201103L
|
|
_Deque_impl_data(const _Deque_impl_data&) = default;
|
|
_Deque_impl_data&
|
|
operator=(const _Deque_impl_data&) = default;
|
|
|
|
_Deque_impl_data(_Deque_impl_data&& __x) noexcept
|
|
: _Deque_impl_data(__x)
|
|
{ __x = _Deque_impl_data(); }
|
|
#endif
|
|
|
|
void
|
|
_M_swap_data(_Deque_impl_data& __x) _GLIBCXX_NOEXCEPT
|
|
{
|
|
// Do not use std::swap(_M_start, __x._M_start), etc as it loses
|
|
// information used by TBAA.
|
|
std::swap(*this, __x);
|
|
}
|
|
};
|
|
|
|
// 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, public _Deque_impl_data
|
|
{
|
|
_Deque_impl() _GLIBCXX_NOEXCEPT_IF(
|
|
is_nothrow_default_constructible<_Tp_alloc_type>::value)
|
|
: _Tp_alloc_type()
|
|
{ }
|
|
|
|
_Deque_impl(const _Tp_alloc_type& __a) _GLIBCXX_NOEXCEPT
|
|
: _Tp_alloc_type(__a)
|
|
{ }
|
|
|
|
#if __cplusplus >= 201103L
|
|
_Deque_impl(_Deque_impl&&) = default;
|
|
|
|
_Deque_impl(_Tp_alloc_type&& __a) noexcept
|
|
: _Tp_alloc_type(std::move(__a))
|
|
{ }
|
|
|
|
_Deque_impl(_Deque_impl&& __d, _Tp_alloc_type&& __a)
|
|
: _Tp_alloc_type(std::move(__a)), _Deque_impl_data(std::move(__d))
|
|
{ }
|
|
#endif
|
|
};
|
|
|
|
_Tp_alloc_type&
|
|
_M_get_Tp_allocator() _GLIBCXX_NOEXCEPT
|
|
{ return this->_M_impl; }
|
|
|
|
const _Tp_alloc_type&
|
|
_M_get_Tp_allocator() const _GLIBCXX_NOEXCEPT
|
|
{ return 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);
|
|
}
|
|
|
|
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;
|
|
};
|
|
|
|
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");
|
|
# if __cplusplus > 201703L || defined __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;
|
|
|
|
private:
|
|
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.
|
|
*/
|
|
#if __cplusplus >= 201103L
|
|
deque() = default;
|
|
#else
|
|
deque() { }
|
|
#endif
|
|
|
|
/**
|
|
* @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.
|
|
*
|
|
* The newly-created %deque contains the exact contents of the
|
|
* moved instance.
|
|
* The contents of the moved instance are a valid, but unspecified
|
|
* %deque.
|
|
*/
|
|
deque(deque&&) = default;
|
|
|
|
/// Copy constructor with alternative allocator
|
|
deque(const deque& __x, const __type_identity_t<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 __type_identity_t<allocator_type>& __a)
|
|
: deque(std::move(__x), __a, typename _Alloc_traits::is_always_equal{})
|
|
{ }
|
|
|
|
private:
|
|
deque(deque&& __x, const allocator_type& __a, true_type)
|
|
: _Base(std::move(__x), __a)
|
|
{ }
|
|
|
|
deque(deque&& __x, const allocator_type& __a, false_type)
|
|
: _Base(std::move(__x), __a, __x.size())
|
|
{
|
|
if (__x.get_allocator() != __a && !__x.empty())
|
|
{
|
|
std::__uninitialized_move_a(__x.begin(), __x.end(),
|
|
this->_M_impl._M_start,
|
|
_M_get_Tp_allocator());
|
|
__x.clear();
|
|
}
|
|
}
|
|
|
|
public:
|
|
/**
|
|
* @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_range_initialize(__first, __last,
|
|
std::__iterator_category(__first));
|
|
}
|
|
#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_aux(__first, __last, std::__iterator_category(__first)); }
|
|
#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.
|
|
_GLIBCXX_NODISCARD
|
|
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.
|
|
*/
|
|
_GLIBCXX_NODISCARD
|
|
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.
|
|
*/
|
|
_GLIBCXX_NODISCARD
|
|
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.
|
|
*/
|
|
_GLIBCXX_NODISCARD
|
|
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.
|
|
*/
|
|
_GLIBCXX_NODISCARD
|
|
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.
|
|
*/
|
|
_GLIBCXX_NODISCARD
|
|
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.
|
|
*/
|
|
_GLIBCXX_NODISCARD
|
|
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.
|
|
*/
|
|
_GLIBCXX_NODISCARD
|
|
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.
|
|
*/
|
|
_GLIBCXX_NODISCARD
|
|
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.
|
|
*/
|
|
[[__nodiscard__]]
|
|
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.
|
|
*/
|
|
[[__nodiscard__]]
|
|
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.
|
|
*/
|
|
[[__nodiscard__]]
|
|
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.
|
|
*/
|
|
[[__nodiscard__]]
|
|
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. */
|
|
_GLIBCXX_NODISCARD
|
|
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. */
|
|
_GLIBCXX_NODISCARD
|
|
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)
|
|
#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())
|
|
#endif
|
|
{
|
|
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));
|
|
}
|
|
|
|
#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().)
|
|
*/
|
|
_GLIBCXX_NODISCARD
|
|
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().)
|
|
*/
|
|
_GLIBCXX_NODISCARD
|
|
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.
|
|
*/
|
|
_GLIBCXX_NODISCARD
|
|
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.
|
|
*/
|
|
_GLIBCXX_NODISCARD
|
|
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.
|
|
*/
|
|
_GLIBCXX_NODISCARD
|
|
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.
|
|
*/
|
|
_GLIBCXX_NODISCARD
|
|
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(_M_get_Tp_allocator(),
|
|
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(_M_get_Tp_allocator(),
|
|
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.
|
|
* @return An iterator that points to the inserted data.
|
|
*
|
|
* 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;
|
|
}
|
|
|
|
/**
|
|
* @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_range_insert_aux(__position._M_const_cast(), __first, __last,
|
|
std::__iterator_category(__first));
|
|
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.
|
|
|
|
#if __cplusplus < 201103L
|
|
// 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);
|
|
}
|
|
|
|
// 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));
|
|
}
|
|
#endif
|
|
|
|
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 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.
|
|
|
|
#if __cplusplus < 201103L
|
|
// 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)); }
|
|
#endif
|
|
|
|
// 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.
|
|
|
|
#if __cplusplus < 201103L
|
|
// 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));
|
|
}
|
|
#endif
|
|
|
|
// 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)
|
|
{
|
|
if (_M_get_Tp_allocator() == __x._M_get_Tp_allocator())
|
|
return _M_move_assign1(std::move(__x), true_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_iterator(__x.begin()),
|
|
std::make_move_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>
|
|
_GLIBCXX_NODISCARD
|
|
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()); }
|
|
|
|
#if __cpp_lib_three_way_comparison
|
|
/**
|
|
* @brief Deque ordering relation.
|
|
* @param __x A `deque`.
|
|
* @param __y A `deque` of the same type as `__x`.
|
|
* @return A value indicating whether `__x` is less than, equal to,
|
|
* greater than, or incomparable with `__y`.
|
|
*
|
|
* See `std::lexicographical_compare_three_way()` for how the determination
|
|
* is made. This operator is used to synthesize relational operators like
|
|
* `<` and `>=` etc.
|
|
*/
|
|
template<typename _Tp, typename _Alloc>
|
|
[[nodiscard]]
|
|
inline __detail::__synth3way_t<_Tp>
|
|
operator<=>(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y)
|
|
{
|
|
return std::lexicographical_compare_three_way(__x.begin(), __x.end(),
|
|
__y.begin(), __y.end(),
|
|
__detail::__synth3way);
|
|
}
|
|
#else
|
|
/**
|
|
* @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>
|
|
_GLIBCXX_NODISCARD
|
|
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>
|
|
_GLIBCXX_NODISCARD
|
|
inline bool
|
|
operator!=(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y)
|
|
{ return !(__x == __y); }
|
|
|
|
/// Based on operator<
|
|
template<typename _Tp, typename _Alloc>
|
|
_GLIBCXX_NODISCARD
|
|
inline bool
|
|
operator>(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y)
|
|
{ return __y < __x; }
|
|
|
|
/// Based on operator<
|
|
template<typename _Tp, typename _Alloc>
|
|
_GLIBCXX_NODISCARD
|
|
inline bool
|
|
operator<=(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y)
|
|
{ return !(__y < __x); }
|
|
|
|
/// Based on operator<
|
|
template<typename _Tp, typename _Alloc>
|
|
_GLIBCXX_NODISCARD
|
|
inline bool
|
|
operator>=(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y)
|
|
{ return !(__x < __y); }
|
|
#endif // three-way comparison
|
|
|
|
/// 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 */
|