// Deque implementation -*- C++ -*-
-// Copyright (C) 2001, 2002 Free Software Foundation, Inc.
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
+// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
-// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.
// As a special exception, you may use this file as part of a free software
* You should not attempt to use it directly.
*/
-#ifndef __GLIBCPP_INTERNAL_DEQUE_H
-#define __GLIBCPP_INTERNAL_DEQUE_H
+#ifndef _DEQUE_H
+#define _DEQUE_H 1
#include <bits/concept_check.h>
#include <bits/stl_iterator_base_types.h>
#include <bits/stl_iterator_base_funcs.h>
-// Since this entire file is within namespace std, there's no reason to
-// waste two spaces along the left column. Thus the leading indentation is
-// slightly violated from here on.
-namespace std
-{
-
-/**
- * @if maint
- * @brief This function controls the size of memory nodes.
- * @param size The size of an element.
- * @return The number (not byte size) of elements per node.
- *
- * This function started off as a compiler kludge from SGI, but seems to
- * be a useful wrapper around a repeated constant expression. The '512' is
- * tuneable (and no other code needs to change), but no investigation has
- * been done since inheriting the SGI code.
- * @endif
-*/
-inline size_t
-__deque_buf_size(size_t __size)
- { return __size < 512 ? size_t(512 / __size) : size_t(1); }
-
+_GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD)
-/**
- * @brief A deque::iterator.
- *
- * Quite a bit of intelligence here. Much of the functionality of deque is
- * actually passed off to this class. A deque holds two of these internally,
- * marking its valid range. Access to elements is done as offsets of either
- * of those two, relying on operator overloading in this class.
- *
- * @if maint
- * All the functions are op overloads except for _M_set_node.
- * @endif
-*/
-template <typename _Tp, typename _Ref, typename _Ptr>
- struct _Deque_iterator
-{
- typedef _Deque_iterator<_Tp, _Tp&, _Tp*> iterator;
- typedef _Deque_iterator<_Tp, const _Tp&, const _Tp*> const_iterator;
- static size_t _S_buffer_size() { return __deque_buf_size(sizeof(_Tp)); }
-
- typedef random_access_iterator_tag iterator_category;
- typedef _Tp value_type;
- typedef _Ptr pointer;
- typedef _Ref reference;
- typedef size_t size_type;
- typedef ptrdiff_t difference_type;
- typedef _Tp** _Map_pointer;
- typedef _Deque_iterator _Self;
-
- _Tp* _M_cur;
- _Tp* _M_first;
- _Tp* _M_last;
- _Map_pointer _M_node;
-
- _Deque_iterator(_Tp* __x, _Map_pointer __y)
- : _M_cur(__x), _M_first(*__y),
- _M_last(*__y + _S_buffer_size()), _M_node(__y) {}
- _Deque_iterator() : _M_cur(0), _M_first(0), _M_last(0), _M_node(0) {}
- _Deque_iterator(const iterator& __x)
- : _M_cur(__x._M_cur), _M_first(__x._M_first),
- _M_last(__x._M_last), _M_node(__x._M_node) {}
-
- reference operator*() const { return *_M_cur; }
- pointer operator->() const { return _M_cur; }
-
- _Self& operator++() {
- ++_M_cur;
- if (_M_cur == _M_last) {
- _M_set_node(_M_node + 1);
- _M_cur = _M_first;
- }
- return *this;
- }
- _Self operator++(int) {
- _Self __tmp = *this;
- ++*this;
- return __tmp;
- }
-
- _Self& operator--() {
- if (_M_cur == _M_first) {
- _M_set_node(_M_node - 1);
- _M_cur = _M_last;
- }
- --_M_cur;
- return *this;
- }
- _Self operator--(int) {
- _Self __tmp = *this;
- --*this;
- return __tmp;
- }
-
- _Self& operator+=(difference_type __n)
- {
- difference_type __offset = __n + (_M_cur - _M_first);
- if (__offset >= 0 && __offset < difference_type(_S_buffer_size()))
- _M_cur += __n;
- else {
- difference_type __node_offset =
- __offset > 0 ? __offset / difference_type(_S_buffer_size())
- : -difference_type((-__offset - 1) / _S_buffer_size()) - 1;
- _M_set_node(_M_node + __node_offset);
- _M_cur = _M_first +
- (__offset - __node_offset * difference_type(_S_buffer_size()));
- }
- return *this;
- }
-
- _Self operator+(difference_type __n) const
- {
- _Self __tmp = *this;
- return __tmp += __n;
- }
-
- _Self& operator-=(difference_type __n) { return *this += -__n; }
-
- _Self operator-(difference_type __n) const {
- _Self __tmp = *this;
- return __tmp -= __n;
- }
-
- reference operator[](difference_type __n) const { return *(*this + __n); }
-
- /** @if maint
- * Prepares to traverse new_node. Sets everything except _M_cur, which
- * should therefore be set by the caller immediately afterwards, based on
- * _M_first and _M_last.
- * @endif
- */
- void
- _M_set_node(_Map_pointer __new_node)
- {
- _M_node = __new_node;
- _M_first = *__new_node;
- _M_last = _M_first + difference_type(_S_buffer_size());
- }
-};
-
-// Note: we also provide overloads whose operands are of the same type in
-// order to avoid ambiguous overload resolution when std::rel_ops operators
-// are in scope (for additional details, see libstdc++/3628)
-template <typename _Tp, typename _Ref, typename _Ptr>
-inline bool
-operator==(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
- const _Deque_iterator<_Tp, _Ref, _Ptr>& __y)
-{
- return __x._M_cur == __y._M_cur;
-}
-
-template <typename _Tp, typename _RefL, typename _PtrL,
- typename _RefR, typename _PtrR>
-inline bool
-operator==(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
- const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
-{
- return __x._M_cur == __y._M_cur;
-}
-
-template <typename _Tp, typename _Ref, typename _Ptr>
-inline bool
-operator!=(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
- const _Deque_iterator<_Tp, _Ref, _Ptr>& __y)
-{
- return !(__x == __y);
-}
-
-template <typename _Tp, typename _RefL, typename _PtrL,
- typename _RefR, typename _PtrR>
-inline bool
-operator!=(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
- const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
-{
- return !(__x == __y);
-}
-
-template <typename _Tp, typename _Ref, typename _Ptr>
-inline bool
-operator<(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
- const _Deque_iterator<_Tp, _Ref, _Ptr>& __y)
-{
- return (__x._M_node == __y._M_node) ?
- (__x._M_cur < __y._M_cur) : (__x._M_node < __y._M_node);
-}
-
-template <typename _Tp, typename _RefL, typename _PtrL,
- typename _RefR, typename _PtrR>
-inline bool
-operator<(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
- const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
-{
- return (__x._M_node == __y._M_node) ?
- (__x._M_cur < __y._M_cur) : (__x._M_node < __y._M_node);
-}
-
-template <typename _Tp, typename _Ref, typename _Ptr>
-inline bool
-operator>(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
- const _Deque_iterator<_Tp, _Ref, _Ptr>& __y)
-{
- return __y < __x;
-}
-
-template <typename _Tp, typename _RefL, typename _PtrL,
- typename _RefR, typename _PtrR>
-inline bool
-operator>(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
- const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
-{
- return __y < __x;
-}
-
-template <typename _Tp, typename _Ref, typename _Ptr>
-inline bool
-operator<=(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
- const _Deque_iterator<_Tp, _Ref, _Ptr>& __y)
-{
- return !(__y < __x);
-}
-
-template <typename _Tp, typename _RefL, typename _PtrL,
- typename _RefR, typename _PtrR>
-inline bool
-operator<=(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
- const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
-{
- return !(__y < __x);
-}
-
-template <typename _Tp, typename _Ref, typename _Ptr>
-inline bool
-operator>=(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
- const _Deque_iterator<_Tp, _Ref, _Ptr>& __y)
-{
- return !(__x < __y);
-}
-
-template <typename _Tp, typename _RefL, typename _PtrL,
- typename _RefR, typename _PtrR>
-inline bool
-operator>=(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
- const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
-{
- return !(__x < __y);
-}
-
-// _GLIBCPP_RESOLVE_LIB_DEFECTS
-// According to the resolution of DR179 not only the various comparison
-// operators but also operator- must accept mixed iterator/const_iterator
-// parameters.
-template <typename _Tp, typename _RefL, typename _PtrL,
- typename _RefR, typename _PtrR>
-inline typename _Deque_iterator<_Tp, _RefL, _PtrL>::difference_type
-operator-(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
- const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
-{
- return _Deque_iterator<_Tp, _RefL, _PtrL>::difference_type
- (_Deque_iterator<_Tp, _RefL, _PtrL>::_S_buffer_size()) *
- (__x._M_node - __y._M_node - 1) + (__x._M_cur - __x._M_first) +
- (__y._M_last - __y._M_cur);
-}
-
-template <typename _Tp, typename _Ref, typename _Ptr>
-inline _Deque_iterator<_Tp, _Ref, _Ptr>
-operator+(ptrdiff_t __n, const _Deque_iterator<_Tp, _Ref, _Ptr>& __x)
-{
- return __x + __n;
-}
-
-
-/// @if maint Primary default version. @endif
-/**
- * @if maint
- * Deque base class. It has two purposes. First, its constructor
- * and destructor allocate (but don't initialize) storage. This makes
- * %exception safety easier. Second, the base class encapsulates all of
- * the differences between SGI-style allocators and standard-conforming
- * allocators. (See stl_alloc.h for more on this topic.) There are two
- * versions: this ordinary one, and the space-saving specialization for
- * instanceless allocators.
- * @endif
-*/
-template <typename _Tp, typename _Alloc, bool __is_static>
- class _Deque_alloc_base
-{
-public:
- typedef typename _Alloc_traits<_Tp,_Alloc>::allocator_type allocator_type;
- allocator_type get_allocator() const { return _M_node_allocator; }
-
- _Deque_alloc_base(const allocator_type& __a)
- : _M_node_allocator(__a), _M_map_allocator(__a),
- _M_map(0), _M_map_size(0)
- {}
-
-protected:
- typedef typename _Alloc_traits<_Tp*, _Alloc>::allocator_type
- _Map_allocator_type;
-
- _Tp*
- _M_allocate_node()
- {
- return _M_node_allocator.allocate(__deque_buf_size(sizeof(_Tp)));
- }
-
- void
- _M_deallocate_node(_Tp* __p)
- {
- _M_node_allocator.deallocate(__p, __deque_buf_size(sizeof(_Tp)));
- }
-
- _Tp**
- _M_allocate_map(size_t __n)
- { return _M_map_allocator.allocate(__n); }
-
- void
- _M_deallocate_map(_Tp** __p, size_t __n)
- { _M_map_allocator.deallocate(__p, __n); }
-
- allocator_type _M_node_allocator;
- _Map_allocator_type _M_map_allocator;
- _Tp** _M_map;
- size_t _M_map_size;
-};
-
-/// @if maint Specialization for instanceless allocators. @endif
-template <typename _Tp, typename _Alloc>
- class _Deque_alloc_base<_Tp, _Alloc, true>
-{
-public:
- typedef typename _Alloc_traits<_Tp,_Alloc>::allocator_type allocator_type;
- allocator_type get_allocator() const { return allocator_type(); }
-
- _Deque_alloc_base(const allocator_type&)
- : _M_map(0), _M_map_size(0)
- {}
-
-protected:
- typedef typename _Alloc_traits<_Tp,_Alloc>::_Alloc_type _Node_alloc_type;
- typedef typename _Alloc_traits<_Tp*,_Alloc>::_Alloc_type _Map_alloc_type;
-
- _Tp*
- _M_allocate_node()
- {
- return _Node_alloc_type::allocate(__deque_buf_size(sizeof(_Tp)));
- }
-
- void
- _M_deallocate_node(_Tp* __p)
- {
- _Node_alloc_type::deallocate(__p, __deque_buf_size(sizeof(_Tp)));
- }
-
- _Tp**
- _M_allocate_map(size_t __n)
- { return _Map_alloc_type::allocate(__n); }
-
- void
- _M_deallocate_map(_Tp** __p, size_t __n)
- { _Map_alloc_type::deallocate(__p, __n); }
-
- _Tp** _M_map;
- size_t _M_map_size;
-};
-
-
-/**
- * @if maint
- * Deque base class. Using _Alloc_traits in the instantiation of the parent
- * class provides the compile-time dispatching mentioned in the parent's docs.
- * This class provides the unified face for %deque's allocation.
- *
- * Nothing in this class ever constructs or destroys an actual Tp element.
- * (Deque handles that itself.) Only/All memory management is performed here.
- * @endif
-*/
-template <typename _Tp, typename _Alloc>
- class _Deque_base
- : public _Deque_alloc_base<_Tp,_Alloc,
- _Alloc_traits<_Tp, _Alloc>::_S_instanceless>
-{
-public:
- typedef _Deque_alloc_base<_Tp,_Alloc,
- _Alloc_traits<_Tp, _Alloc>::_S_instanceless>
- _Base;
- typedef typename _Base::allocator_type allocator_type;
- typedef _Deque_iterator<_Tp,_Tp&,_Tp*> iterator;
- typedef _Deque_iterator<_Tp,const _Tp&,const _Tp*> const_iterator;
-
- _Deque_base(const allocator_type& __a, size_t __num_elements)
- : _Base(__a), _M_start(), _M_finish()
- { _M_initialize_map(__num_elements); }
- _Deque_base(const allocator_type& __a)
- : _Base(__a), _M_start(), _M_finish() {}
- ~_Deque_base();
-
-protected:
- void _M_initialize_map(size_t);
- void _M_create_nodes(_Tp** __nstart, _Tp** __nfinish);
- void _M_destroy_nodes(_Tp** __nstart, _Tp** __nfinish);
- enum { _S_initial_map_size = 8 };
-
- iterator _M_start;
- iterator _M_finish;
-};
-
-
-template <typename _Tp, typename _Alloc>
-_Deque_base<_Tp,_Alloc>::~_Deque_base()
-{
- if (_M_map)
- {
- _M_destroy_nodes(_M_start._M_node, _M_finish._M_node + 1);
- _M_deallocate_map(_M_map, _M_map_size);
- }
-}
-
-/**
- * @if maint
- * @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...
- * @endif
-*/
-template <typename _Tp, typename _Alloc>
-void
-_Deque_base<_Tp,_Alloc>::_M_initialize_map(size_t __num_elements)
-{
- size_t __num_nodes =
- __num_elements / __deque_buf_size(sizeof(_Tp)) + 1;
-
- _M_map_size = max((size_t) _S_initial_map_size, __num_nodes + 2);
- _M_map = _M_allocate_map(_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.
-
- _Tp** __nstart = _M_map + (_M_map_size - __num_nodes) / 2;
- _Tp** __nfinish = __nstart + __num_nodes;
-
- try
- { _M_create_nodes(__nstart, __nfinish); }
- catch(...)
- {
- _M_deallocate_map(_M_map, _M_map_size);
- _M_map = 0;
- _M_map_size = 0;
- __throw_exception_again;
- }
-
- _M_start._M_set_node(__nstart);
- _M_finish._M_set_node(__nfinish - 1);
- _M_start._M_cur = _M_start._M_first;
- _M_finish._M_cur = _M_finish._M_first +
- __num_elements % __deque_buf_size(sizeof(_Tp));
-}
-
-template <typename _Tp, typename _Alloc>
-void _Deque_base<_Tp,_Alloc>::_M_create_nodes(_Tp** __nstart, _Tp** __nfinish)
-{
- _Tp** __cur;
- try
- {
- for (__cur = __nstart; __cur < __nfinish; ++__cur)
- *__cur = _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(_Tp** __nstart, _Tp** __nfinish)
-{
- for (_Tp** __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 Containers
- * @ingroup Sequences
- *
- * 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.
- *
- * @if maint
- * 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-"nodes".
- * (The name %map has nothing to do with the std::map class, and "nodes"
- * should not be confused with std::list's usage of "node".)
- *
- * A "node" has no specific type name as such, but it is referred to as
- * "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 "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.
- *
- * **** As I write this, the nodes are /not/ allocated using the high-speed
- * memory pool. There are 20 hours left in the year; perhaps I can fix
- * this before 2002.
- *
- * 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 "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 "aware" of the discontiguous storage!
- *
- * The memory setup and layout occurs in the parent, _Base, and the iterator
- * class is entirely responsible for "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.
- * @endif
-*/
-template <typename _Tp, typename _Alloc = allocator<_Tp> >
- class deque : protected _Deque_base<_Tp, _Alloc>
-{
- // concept requirements
- __glibcpp_class_requires(_Tp, _SGIAssignableConcept)
-
- typedef _Deque_base<_Tp, _Alloc> _Base;
-
-public:
- typedef _Tp value_type;
- typedef value_type* pointer;
- typedef const value_type* const_pointer;
- typedef typename _Base::iterator iterator;
- typedef typename _Base::const_iterator const_iterator;
- typedef reverse_iterator<const_iterator> const_reverse_iterator;
- typedef reverse_iterator<iterator> reverse_iterator;
- typedef value_type& reference;
- typedef const value_type& const_reference;
- typedef size_t size_type;
- typedef ptrdiff_t difference_type;
- typedef typename _Base::allocator_type allocator_type;
-
-protected:
- typedef pointer* _Map_pointer;
- static size_t _S_buffer_size() { 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;
-
- /** @if maint
- * A total of four data members accumulated down the heirarchy. If the
- * _Alloc type requires separate instances, then two of them will also be
- * included in each deque.
- * @endif
- */
- using _Base::_M_map;
- using _Base::_M_map_size;
- using _Base::_M_start;
- using _Base::_M_finish;
-
-public:
- // [23.2.1.1] construct/copy/destroy
- // (assign() and get_allocator() are also listed in this section)
/**
- * @brief Default constructor creates no elements.
- */
- explicit
- deque(const allocator_type& __a = allocator_type())
- : _Base(__a, 0) {}
-
- /**
- * @brief Create a %deque with copies of an exemplar element.
- * @param n The number of elements to initially create.
- * @param value An element to copy.
- *
- * 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, __n)
- { _M_fill_initialize(__value); }
-
- /**
- * @brief Create a %deque with default elements.
- * @param n The number of elements to initially create.
- *
- * This constructor fills the %deque with @a n copies of a
- * default-constructed element.
- */
- explicit
- deque(size_type __n)
- : _Base(allocator_type(), __n)
- { _M_fill_initialize(value_type()); }
-
- /**
- * @brief %Deque copy constructor.
- * @param x A %deque of identical element and allocator types.
- *
- * The newly-created %deque uses a copy of the allocation object used
- * by @a x.
- */
- deque(const deque& __x)
- : _Base(__x.get_allocator(), __x.size())
- { uninitialized_copy(__x.begin(), __x.end(), _M_start); }
-
- /**
- * @brief Builds a %deque from a range.
- * @param first An input iterator.
- * @param last An input iterator.
- *
- * Creats a %deque consisting of copies of the elements from [first,last).
+ * @if maint
+ * @brief This function controls the size of memory nodes.
+ * @param size The size of an element.
+ * @return The number (not byte size) of elements per node.
*
- * 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.
- */
- 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 _Is_integer<_InputIterator>::_Integral _Integral;
- _M_initialize_dispatch(__first, __last, _Integral());
- }
-
- /**
- * 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 responsibilty.
- */
- ~deque() { _Destroy(_M_start, _M_finish); }
-
- /**
- * @brief %Deque assignment operator.
- * @param x A %deque of identical element and allocator types.
- *
- * All the elements of @a x are copied, but unlike the copy constructor, the
- * allocator object is not copied.
+ * This function started off as a compiler kludge from SGI, but seems to
+ * be a useful wrapper around a repeated constant expression. The '512' is
+ * tuneable (and no other code needs to change), but no investigation has
+ * been done since inheriting the SGI code.
+ * @endif
*/
- deque&
- operator=(const deque& __x);
+ inline size_t
+ __deque_buf_size(size_t __size)
+ { return __size < 512 ? size_t(512 / __size) : size_t(1); }
- /**
- * @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.
- * Old data may be lost.
- */
- 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.
+ * @brief A deque::iterator.
*
- * This function fills a %deque with copies of the elements in the
- * range [first,last).
+ * Quite a bit of intelligence here. Much of the functionality of
+ * deque is actually passed off to this class. A deque holds two
+ * of these internally, marking its valid range. Access to
+ * elements is done as offsets of either of those two, relying on
+ * operator overloading in this class.
*
- * Note that the assignment completely changes the %deque and that the
- * resulting %deque's size is the same as the number of elements assigned.
- * Old data may be lost.
+ * @if maint
+ * All the functions are op overloads except for _M_set_node.
+ * @endif
*/
- template<typename _InputIterator>
- void
- assign(_InputIterator __first, _InputIterator __last)
+ template<typename _Tp, typename _Ref, typename _Ptr>
+ struct _Deque_iterator
{
- typedef typename _Is_integer<_InputIterator>::_Integral _Integral;
- _M_assign_dispatch(__first, __last, _Integral());
- }
-
- /// Get a copy of the memory allocation object.
- allocator_type
- get_allocator() const { return _Base::get_allocator(); }
-
- // iterators
- /**
- * Returns a read/write iterator that points to the first element in the
- * %deque. Iteration is done in ordinary element order.
- */
- iterator
- begin() { return _M_start; }
-
- /**
- * Returns a read-only (constant) iterator that points to the first element
- * in the %deque. Iteration is done in ordinary element order.
- */
- const_iterator
- begin() const { return _M_start; }
-
- /**
- * Returns a read/write iterator that points one past the last element in
- * the %deque. Iteration is done in ordinary element order.
- */
- iterator
- end() { return _M_finish; }
+ typedef _Deque_iterator<_Tp, _Tp&, _Tp*> iterator;
+ typedef _Deque_iterator<_Tp, const _Tp&, const _Tp*> const_iterator;
+
+ static size_t _S_buffer_size()
+ { return __deque_buf_size(sizeof(_Tp)); }
+
+ typedef std::random_access_iterator_tag iterator_category;
+ typedef _Tp value_type;
+ typedef _Ptr pointer;
+ typedef _Ref reference;
+ typedef size_t size_type;
+ typedef ptrdiff_t difference_type;
+ typedef _Tp** _Map_pointer;
+ typedef _Deque_iterator _Self;
+
+ _Tp* _M_cur;
+ _Tp* _M_first;
+ _Tp* _M_last;
+ _Map_pointer _M_node;
+
+ _Deque_iterator(_Tp* __x, _Map_pointer __y)
+ : _M_cur(__x), _M_first(*__y),
+ _M_last(*__y + _S_buffer_size()), _M_node(__y) {}
+
+ _Deque_iterator() : _M_cur(0), _M_first(0), _M_last(0), _M_node(0) {}
+
+ _Deque_iterator(const iterator& __x)
+ : _M_cur(__x._M_cur), _M_first(__x._M_first),
+ _M_last(__x._M_last), _M_node(__x._M_node) {}
+
+ reference
+ operator*() const
+ { return *_M_cur; }
+
+ pointer
+ operator->() const
+ { return _M_cur; }
+
+ _Self&
+ operator++()
+ {
+ ++_M_cur;
+ if (_M_cur == _M_last)
+ {
+ _M_set_node(_M_node + 1);
+ _M_cur = _M_first;
+ }
+ return *this;
+ }
- /**
- * Returns a read-only (constant) iterator that points one past the last
- * element in the %deque. Iteration is done in ordinary element order.
- */
- const_iterator
- end() const { return _M_finish; }
+ _Self
+ operator++(int)
+ {
+ _Self __tmp = *this;
+ ++*this;
+ return __tmp;
+ }
- /**
- * Returns a read/write reverse iterator that points to the last element in
- * the %deque. Iteration is done in reverse element order.
- */
- reverse_iterator
- rbegin() { return reverse_iterator(_M_finish); }
+ _Self&
+ operator--()
+ {
+ if (_M_cur == _M_first)
+ {
+ _M_set_node(_M_node - 1);
+ _M_cur = _M_last;
+ }
+ --_M_cur;
+ return *this;
+ }
- /**
- * Returns a read-only (constant) reverse iterator that points to the last
- * element in the %deque. Iteration is done in reverse element order.
- */
- const_reverse_iterator
- rbegin() const { return const_reverse_iterator(_M_finish); }
+ _Self
+ operator--(int)
+ {
+ _Self __tmp = *this;
+ --*this;
+ return __tmp;
+ }
- /**
- * Returns a read/write reverse iterator that points to one before the
- * first element in the %deque. Iteration is done in reverse element
- * order.
- */
- reverse_iterator
- rend() { return reverse_iterator(_M_start); }
+ _Self&
+ operator+=(difference_type __n)
+ {
+ const difference_type __offset = __n + (_M_cur - _M_first);
+ if (__offset >= 0 && __offset < difference_type(_S_buffer_size()))
+ _M_cur += __n;
+ else
+ {
+ const difference_type __node_offset =
+ __offset > 0 ? __offset / difference_type(_S_buffer_size())
+ : -difference_type((-__offset - 1)
+ / _S_buffer_size()) - 1;
+ _M_set_node(_M_node + __node_offset);
+ _M_cur = _M_first + (__offset - __node_offset
+ * difference_type(_S_buffer_size()));
+ }
+ return *this;
+ }
- /**
- * Returns a read-only (constant) reverse iterator that points to one
- * before the first element in the %deque. Iteration is done in reverse
- * element order.
- */
- const_reverse_iterator
- rend() const { return const_reverse_iterator(_M_start); }
+ _Self
+ operator+(difference_type __n) const
+ {
+ _Self __tmp = *this;
+ return __tmp += __n;
+ }
- // [23.2.1.2] capacity
- /** Returns the number of elements in the %deque. */
- size_type
- size() const { return _M_finish - _M_start; }
+ _Self&
+ operator-=(difference_type __n)
+ { return *this += -__n; }
- /** Returns the size() of the largest possible %deque. */
- size_type
- max_size() const { return size_type(-1); }
+ _Self
+ operator-(difference_type __n) const
+ {
+ _Self __tmp = *this;
+ return __tmp -= __n;
+ }
- /**
- * @brief Resizes the %deque to the specified number of elements.
- * @param new_size Number of elements the %deque should contain.
- * @param x Data with which new elements should be populated.
- *
- * This function will %resize the %deque to the specified number of
- * elements. If the number is smaller than the %deque's current size the
- * %deque is truncated, otherwise the %deque is extended and new elements
- * are populated with given data.
- */
- void
- resize(size_type __new_size, const value_type& __x)
- {
- const size_type __len = size();
- if (__new_size < __len)
- erase(_M_start + __new_size, _M_finish);
- else
- insert(_M_finish, __new_size - __len, __x);
- }
+ reference
+ operator[](difference_type __n) const
+ { return *(*this + __n); }
+
+ /** @if maint
+ * Prepares to traverse new_node. Sets everything except
+ * _M_cur, which should therefore be set by the caller
+ * immediately afterwards, based on _M_first and _M_last.
+ * @endif
+ */
+ void
+ _M_set_node(_Map_pointer __new_node)
+ {
+ _M_node = __new_node;
+ _M_first = *__new_node;
+ _M_last = _M_first + difference_type(_S_buffer_size());
+ }
+ };
+
+ // Note: we also provide overloads whose operands are of the same type in
+ // order to avoid ambiguous overload resolution when std::rel_ops operators
+ // are in scope (for additional details, see libstdc++/3628)
+ template<typename _Tp, typename _Ref, typename _Ptr>
+ inline bool
+ operator==(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
+ const _Deque_iterator<_Tp, _Ref, _Ptr>& __y)
+ { return __x._M_cur == __y._M_cur; }
+
+ template<typename _Tp, typename _RefL, typename _PtrL,
+ typename _RefR, typename _PtrR>
+ inline bool
+ operator==(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
+ const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
+ { return __x._M_cur == __y._M_cur; }
+
+ template<typename _Tp, typename _Ref, typename _Ptr>
+ inline bool
+ operator!=(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
+ const _Deque_iterator<_Tp, _Ref, _Ptr>& __y)
+ { return !(__x == __y); }
+
+ template<typename _Tp, typename _RefL, typename _PtrL,
+ typename _RefR, typename _PtrR>
+ inline bool
+ operator!=(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
+ const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
+ { return !(__x == __y); }
+
+ template<typename _Tp, typename _Ref, typename _Ptr>
+ inline bool
+ operator<(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
+ const _Deque_iterator<_Tp, _Ref, _Ptr>& __y)
+ { return (__x._M_node == __y._M_node) ? (__x._M_cur < __y._M_cur)
+ : (__x._M_node < __y._M_node); }
+
+ template<typename _Tp, typename _RefL, typename _PtrL,
+ typename _RefR, typename _PtrR>
+ inline bool
+ operator<(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
+ const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
+ { return (__x._M_node == __y._M_node) ? (__x._M_cur < __y._M_cur)
+ : (__x._M_node < __y._M_node); }
+
+ template<typename _Tp, typename _Ref, typename _Ptr>
+ inline bool
+ operator>(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
+ const _Deque_iterator<_Tp, _Ref, _Ptr>& __y)
+ { return __y < __x; }
+
+ template<typename _Tp, typename _RefL, typename _PtrL,
+ typename _RefR, typename _PtrR>
+ inline bool
+ operator>(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
+ const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
+ { return __y < __x; }
+
+ template<typename _Tp, typename _Ref, typename _Ptr>
+ inline bool
+ operator<=(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
+ const _Deque_iterator<_Tp, _Ref, _Ptr>& __y)
+ { return !(__y < __x); }
+
+ template<typename _Tp, typename _RefL, typename _PtrL,
+ typename _RefR, typename _PtrR>
+ inline bool
+ operator<=(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
+ const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
+ { return !(__y < __x); }
+
+ template<typename _Tp, typename _Ref, typename _Ptr>
+ inline bool
+ operator>=(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
+ const _Deque_iterator<_Tp, _Ref, _Ptr>& __y)
+ { return !(__x < __y); }
+
+ template<typename _Tp, typename _RefL, typename _PtrL,
+ typename _RefR, typename _PtrR>
+ inline bool
+ operator>=(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
+ const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
+ { return !(__x < __y); }
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // According to the resolution of DR179 not only the various comparison
+ // operators but also operator- must accept mixed iterator/const_iterator
+ // parameters.
+ template<typename _Tp, typename _Ref, typename _Ptr>
+ inline typename _Deque_iterator<_Tp, _Ref, _Ptr>::difference_type
+ operator-(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
+ const _Deque_iterator<_Tp, _Ref, _Ptr>& __y)
+ {
+ return typename _Deque_iterator<_Tp, _Ref, _Ptr>::difference_type
+ (_Deque_iterator<_Tp, _Ref, _Ptr>::_S_buffer_size())
+ * (__x._M_node - __y._M_node - 1) + (__x._M_cur - __x._M_first)
+ + (__y._M_last - __y._M_cur);
+ }
- /**
- * @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 the %deque is extended and new elements
- * are default-constructed.
- */
- void
- resize(size_type new_size) { resize(new_size, value_type()); }
+ template<typename _Tp, typename _RefL, typename _PtrL,
+ typename _RefR, typename _PtrR>
+ inline typename _Deque_iterator<_Tp, _RefL, _PtrL>::difference_type
+ operator-(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
+ const _Deque_iterator<_Tp, _RefR, _PtrR>& __y)
+ {
+ return typename _Deque_iterator<_Tp, _RefL, _PtrL>::difference_type
+ (_Deque_iterator<_Tp, _RefL, _PtrL>::_S_buffer_size())
+ * (__x._M_node - __y._M_node - 1) + (__x._M_cur - __x._M_first)
+ + (__y._M_last - __y._M_cur);
+ }
- /**
- * Returns true if the %deque is empty. (Thus begin() would equal end().)
- */
- bool empty() const { return _M_finish == _M_start; }
+ template<typename _Tp, typename _Ref, typename _Ptr>
+ inline _Deque_iterator<_Tp, _Ref, _Ptr>
+ operator+(ptrdiff_t __n, const _Deque_iterator<_Tp, _Ref, _Ptr>& __x)
+ { return __x + __n; }
- // element access
- /**
- * @brief Subscript access to the data contained in the %deque.
- * @param n The index of the element for which data should be accessed.
- * @return Read/write reference to data.
- *
- * This operator allows for easy, array-style, data access.
- * Note that data access with this operator is unchecked and out_of_range
- * lookups are not defined. (For checked lookups see at().)
- */
- reference
- operator[](size_type __n) { return _M_start[difference_type(__n)]; }
+ template<typename _Tp>
+ void
+ fill(const _Deque_iterator<_Tp, _Tp&, _Tp*>& __first,
+ const _Deque_iterator<_Tp, _Tp&, _Tp*>& __last, const _Tp& __value);
/**
- * @brief Subscript access to the data contained in the %deque.
- * @param n The index of the element for which data should be accessed.
- * @return Read-only (constant) reference to data.
- *
- * This operator allows for easy, array-style, data access.
- * Note that data access with this operator is unchecked and out_of_range
- * lookups are not defined. (For checked lookups see at().)
- */
- const_reference
- operator[](size_type __n) const { return _M_start[difference_type(__n)]; }
-
-protected:
- /// @if maint Safety check used only from at(). @endif
- void
- _M_range_check(size_type __n) const
- {
- if (__n >= this->size())
- __throw_out_of_range("deque [] access out of range");
- }
-
-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.
+ * @if maint
+ * 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.
*
- * 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.
+ * Nothing in this class ever constructs or destroys an actual Tp element.
+ * (Deque handles that itself.) Only/All memory management is performed
+ * here.
+ * @endif
*/
- reference
- at(size_type __n) { _M_range_check(__n); return (*this)[__n]; }
+ template<typename _Tp, typename _Alloc>
+ class _Deque_base
+ {
+ public:
+ typedef _Alloc allocator_type;
+
+ allocator_type
+ get_allocator() const
+ { return allocator_type(_M_get_Tp_allocator()); }
+
+ typedef _Deque_iterator<_Tp, _Tp&, _Tp*> iterator;
+ typedef _Deque_iterator<_Tp, const _Tp&, const _Tp*> const_iterator;
+
+ _Deque_base(const allocator_type& __a, size_t __num_elements)
+ : _M_impl(__a)
+ { _M_initialize_map(__num_elements); }
+
+ _Deque_base(const allocator_type& __a)
+ : _M_impl(__a)
+ { }
+
+ ~_Deque_base();
+
+ protected:
+ //This struct encapsulates the implementation of the std::deque
+ //standard container and at the same time makes use of the EBO
+ //for empty allocators.
+ typedef typename _Alloc::template rebind<_Tp*>::other _Map_alloc_type;
+
+ typedef typename _Alloc::template rebind<_Tp>::other _Tp_alloc_type;
+
+ struct _Deque_impl
+ : public _Tp_alloc_type
+ {
+ _Tp** _M_map;
+ size_t _M_map_size;
+ iterator _M_start;
+ iterator _M_finish;
+
+ _Deque_impl(const _Tp_alloc_type& __a)
+ : _Tp_alloc_type(__a), _M_map(0), _M_map_size(0),
+ _M_start(), _M_finish()
+ { }
+ };
+
+ _Tp_alloc_type&
+ _M_get_Tp_allocator()
+ { return *static_cast<_Tp_alloc_type*>(&this->_M_impl); }
+
+ const _Tp_alloc_type&
+ _M_get_Tp_allocator() const
+ { return *static_cast<const _Tp_alloc_type*>(&this->_M_impl); }
+
+ _Map_alloc_type
+ _M_get_map_allocator() const
+ { return _Map_alloc_type(_M_get_Tp_allocator()); }
+
+ _Tp*
+ _M_allocate_node()
+ {
+ return _M_impl._Tp_alloc_type::allocate(__deque_buf_size(sizeof(_Tp)));
+ }
- /**
- * @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]; }
+ void
+ _M_deallocate_node(_Tp* __p)
+ {
+ _M_impl._Tp_alloc_type::deallocate(__p, __deque_buf_size(sizeof(_Tp)));
+ }
- /**
- * Returns a read/write reference to the data at the first element of the
- * %deque.
- */
- reference
- front() { return *_M_start; }
+ _Tp**
+ _M_allocate_map(size_t __n)
+ { return _M_get_map_allocator().allocate(__n); }
- /**
- * Returns a read-only (constant) reference to the data at the first
- * element of the %deque.
- */
- const_reference
- front() const { return *_M_start; }
+ void
+ _M_deallocate_map(_Tp** __p, size_t __n)
+ { _M_get_map_allocator().deallocate(__p, __n); }
- /**
- * Returns a read/write reference to the data at the last element of the
- * %deque.
- */
- reference
- back()
- {
- iterator __tmp = _M_finish;
- --__tmp;
- return *__tmp;
- }
+ protected:
+ void _M_initialize_map(size_t);
+ void _M_create_nodes(_Tp** __nstart, _Tp** __nfinish);
+ void _M_destroy_nodes(_Tp** __nstart, _Tp** __nfinish);
+ enum { _S_initial_map_size = 8 };
- /**
- * Returns a read-only (constant) reference to the data at the last
- * element of the %deque.
- */
- const_reference
- back() const
- {
- const_iterator __tmp = _M_finish;
- --__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 (_M_start._M_cur != _M_start._M_first) {
- _Construct(_M_start._M_cur - 1, __x);
- --_M_start._M_cur;
- }
- else
- _M_push_front_aux(__x);
- }
+ _Deque_impl _M_impl;
+ };
-#ifdef _GLIBCPP_DEPRECATED
- /**
- * @brief Add data to the front of the %deque.
- *
- * This is a typical stack operation. The function creates a
- * default-constructed element at the front of the %deque. Due to the nature
- * of a %deque this operation can be done in constant time. You should
- * consider using push_front(value_type()) instead.
- *
- * @note This was deprecated in 3.2 and will be removed in 3.3. You must
- * define @c _GLIBCPP_DEPRECATED to make this visible in 3.2; see
- * c++config.h.
- */
- void
- push_front()
- {
- if (_M_start._M_cur != _M_start._M_first) {
- _Construct(_M_start._M_cur - 1);
- --_M_start._M_cur;
+ template<typename _Tp, typename _Alloc>
+ _Deque_base<_Tp, _Alloc>::
+ ~_Deque_base()
+ {
+ 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);
+ }
}
- else
- _M_push_front_aux();
- }
-#endif
/**
- * @brief Add data to the end of the %deque.
- * @param x Data to be added.
+ * @if maint
+ * @brief Layout storage.
+ * @param num_elements The count of T's for which to allocate space
+ * at first.
+ * @return Nothing.
*
- * 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.
+ * The initial underlying memory layout is a bit complicated...
+ * @endif
*/
- void
- push_back(const value_type& __x)
- {
- if (_M_finish._M_cur != _M_finish._M_last - 1) {
- _Construct(_M_finish._M_cur, __x);
- ++_M_finish._M_cur;
+ 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.
+
+ _Tp** __nstart = (this->_M_impl._M_map
+ + (this->_M_impl._M_map_size - __num_nodes) / 2);
+ _Tp** __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 = 0;
+ 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)));
}
- else
- _M_push_back_aux(__x);
- }
-#ifdef _GLIBCPP_DEPRECATED
- /**
- * @brief Add data to the end of the %deque.
- *
- * This is a typical stack operation. The function creates a
- * default-constructed element at the end of the %deque. Due to the nature
- * of a %deque this operation can be done in constant time. You should
- * consider using push_back(value_type()) instead.
- *
- * @note This was deprecated in 3.2 and will be removed in 3.3. You must
- * define @c _GLIBCPP_DEPRECATED to make this visible in 3.2; see
- * c++config.h.
- */
- void
- push_back()
- {
- if (_M_finish._M_cur != _M_finish._M_last - 1) {
- _Construct(_M_finish._M_cur);
- ++_M_finish._M_cur;
+ template<typename _Tp, typename _Alloc>
+ void
+ _Deque_base<_Tp, _Alloc>::
+ _M_create_nodes(_Tp** __nstart, _Tp** __nfinish)
+ {
+ _Tp** __cur;
+ try
+ {
+ for (__cur = __nstart; __cur < __nfinish; ++__cur)
+ *__cur = this->_M_allocate_node();
+ }
+ catch(...)
+ {
+ _M_destroy_nodes(__nstart, __cur);
+ __throw_exception_again;
+ }
}
- else
- _M_push_back_aux();
- }
-#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()
- {
- if (_M_start._M_cur != _M_start._M_last - 1) {
- _Destroy(_M_start._M_cur);
- ++_M_start._M_cur;
+ template<typename _Tp, typename _Alloc>
+ void
+ _Deque_base<_Tp, _Alloc>::
+ _M_destroy_nodes(_Tp** __nstart, _Tp** __nfinish)
+ {
+ for (_Tp** __n = __nstart; __n < __nfinish; ++__n)
+ _M_deallocate_node(*__n);
}
- else
- _M_pop_front_aux();
- }
/**
- * @brief Removes last element.
- *
- * This is a typical stack operation. It shrinks the %deque by one.
+ * @brief A standard container using fixed-size memory allocation and
+ * constant-time manipulation of elements at either end.
*
- * 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()
- {
- if (_M_finish._M_cur != _M_finish._M_first) {
- --_M_finish._M_cur;
- _Destroy(_M_finish._M_cur);
- }
- else
- _M_pop_back_aux();
- }
-
- /**
- * @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.
+ * @ingroup Containers
+ * @ingroup Sequences
*
- * This function will insert a copy of the given value before the specified
- * location.
- */
- iterator
- insert(iterator position, const value_type& __x);
-
-#ifdef _GLIBCPP_DEPRECATED
- /**
- * @brief Inserts an element into the %deque.
- * @param position An iterator into the %deque.
- * @return An iterator that points to the inserted element.
+ * 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>.
*
- * This function will insert a default-constructed element before the
- * specified location. You should consider using
- * insert(position,value_type()) instead.
+ * 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.
*
- * @note This was deprecated in 3.2 and will be removed in 3.3. You must
- * define @c _GLIBCPP_DEPRECATED to make this visible in 3.2; see
- * c++config.h.
- */
- iterator
- insert(iterator __position)
- { return insert(__position, value_type()); }
-#endif
-
- /**
- * @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.
+ * @if maint
+ * Here's how a deque<Tp> manages memory. Each deque has 4 members:
*
- * 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); }
-
- /**
- * @brief Inserts a range into the %deque.
- * @param pos An iterator into the %deque.
- * @param first An input iterator.
- * @param last An input iterator.
+ * - Tp** _M_map
+ * - size_t _M_map_size
+ * - iterator _M_start, _M_finish
*
- * This function will insert copies of the data in the range [first,last)
- * into the %deque before the location specified by @a pos. This is
- * known as "range insert."
- */
- template<typename _InputIterator>
- void
- insert(iterator __pos, _InputIterator __first, _InputIterator __last)
- {
- // Check whether it's an integral type. If so, it's not an iterator.
- typedef typename _Is_integer<_InputIterator>::_Integral _Integral;
- _M_insert_dispatch(__pos, __first, __last, _Integral());
- }
-
- /**
- * @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()).
+ * map_size is at least 8. %map is an array of map_size
+ * pointers-to-"nodes". (The name %map has nothing to do with the
+ * std::map class, and "nodes" should not be confused with
+ * std::list's usage of "node".)
*
- * This function will erase the element at the given position and thus
- * shorten the %deque by one.
+ * A "node" has no specific type name as such, but it is referred
+ * to as "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
+ * "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.
*
- * 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 responsibilty.
- */
- iterator
- erase(iterator __position);
-
- /**
- * @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()).
+ * 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 "outward".
*
- * This function will erase the elements in the range [first,last) and
- * shorten the %deque accordingly.
+ * 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].
*
- * 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 responsibilty.
- */
- iterator
- erase(iterator __first, iterator __last);
-
- /**
- * @brief Swaps data with another %deque.
- * @param x A %deque of the same element and allocator types.
+ * Here's the magic: nothing in deque is "aware" of the discontiguous
+ * storage!
*
- * 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.
- */
- void
- swap(deque& __x)
- {
- std::swap(_M_start, __x._M_start);
- std::swap(_M_finish, __x._M_finish);
- std::swap(_M_map, __x._M_map);
- std::swap(_M_map_size, __x._M_map_size);
- }
-
- /**
- * 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 responsibilty.
+ * The memory setup and layout occurs in the parent, _Base, and the iterator
+ * class is entirely responsible for "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.
+ * @endif
*/
- void clear();
-
-protected:
- // Internal constructor functions follow.
-
- // called by the range constructor to implement [23.1.1]/9
- template<typename _Integer>
- void
- _M_initialize_dispatch(_Integer __n, _Integer __x, __true_type)
- {
- _M_initialize_map(__n);
- _M_fill_initialize(__x);
- }
-
- // called by the range constructor to implement [23.1.1]/9
- template<typename _InputIter>
- void
- _M_initialize_dispatch(_InputIter __first, _InputIter __last, __false_type)
+ template<typename _Tp, typename _Alloc = std::allocator<_Tp> >
+ class deque : protected _Deque_base<_Tp, _Alloc>
{
- typedef typename iterator_traits<_InputIter>::iterator_category
- _IterCategory;
- _M_range_initialize(__first, __last, _IterCategory());
- }
+ // concept requirements
+ typedef typename _Alloc::value_type _Alloc_value_type;
+ __glibcxx_class_requires(_Tp, _SGIAssignableConcept)
+ __glibcxx_class_requires2(_Tp, _Alloc_value_type, _SameTypeConcept)
+
+ typedef _Deque_base<_Tp, _Alloc> _Base;
+ typedef typename _Base::_Tp_alloc_type _Tp_alloc_type;
+
+ public:
+ typedef _Tp value_type;
+ typedef typename _Tp_alloc_type::pointer pointer;
+ typedef typename _Tp_alloc_type::const_pointer const_pointer;
+ typedef typename _Tp_alloc_type::reference reference;
+ typedef typename _Tp_alloc_type::const_reference const_reference;
+ typedef typename _Base::iterator iterator;
+ typedef typename _Base::const_iterator const_iterator;
+ typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
+ typedef std::reverse_iterator<iterator> reverse_iterator;
+ typedef size_t size_type;
+ typedef ptrdiff_t difference_type;
+ typedef _Alloc allocator_type;
+
+ protected:
+ typedef pointer* _Map_pointer;
+
+ static size_t _S_buffer_size()
+ { 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;
+
+ /** @if maint
+ * A total of four data members accumulated down the heirarchy.
+ * May be accessed via _M_impl.*
+ * @endif
+ */
+ using _Base::_M_impl;
+
+ public:
+ // [23.2.1.1] construct/copy/destroy
+ // (assign() and get_allocator() are also listed in this section)
+ /**
+ * @brief Default constructor creates no elements.
+ */
+ explicit
+ deque(const allocator_type& __a = allocator_type())
+ : _Base(__a, 0) {}
+
+ /**
+ * @brief Create a %deque with copies of an exemplar element.
+ * @param n The number of elements to initially create.
+ * @param value An element to copy.
+ *
+ * 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, __n)
+ { _M_fill_initialize(__value); }
+
+ /**
+ * @brief %Deque copy constructor.
+ * @param x A %deque of identical element and allocator types.
+ *
+ * The newly-created %deque uses a copy of the allocation object used
+ * by @a x.
+ */
+ deque(const deque& __x)
+ : _Base(__x._M_get_Tp_allocator(), __x.size())
+ { std::__uninitialized_copy_a(__x.begin(), __x.end(),
+ this->_M_impl._M_start,
+ _M_get_Tp_allocator()); }
+
+ /**
+ * @brief Builds a %deque from a range.
+ * @param first An input iterator.
+ * @param last An input iterator.
+ *
+ * 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.
+ */
+ 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());
+ }
+
+ /**
+ * 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 responsibilty.
+ */
+ ~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, but unlike the copy constructor,
+ * the allocator object is not copied.
+ */
+ deque&
+ operator=(const deque& __x);
+
+ /**
+ * @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. Old data may be lost.
+ */
+ 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. Old data may be lost.
+ */
+ template<typename _InputIterator>
+ void
+ assign(_InputIterator __first, _InputIterator __last)
+ {
+ typedef typename std::__is_integer<_InputIterator>::__type _Integral;
+ _M_assign_dispatch(__first, __last, _Integral());
+ }
+
+ /// Get a copy of the memory allocation object.
+ allocator_type
+ get_allocator() const
+ { return _Base::get_allocator(); }
+
+ // iterators
+ /**
+ * Returns a read/write iterator that points to the first element in the
+ * %deque. Iteration is done in ordinary element order.
+ */
+ iterator
+ begin()
+ { return this->_M_impl._M_start; }
+
+ /**
+ * Returns a read-only (constant) iterator that points to the first
+ * element in the %deque. Iteration is done in ordinary element order.
+ */
+ const_iterator
+ begin() const
+ { return this->_M_impl._M_start; }
+
+ /**
+ * Returns a read/write iterator that points one past the last
+ * element in the %deque. Iteration is done in ordinary
+ * element order.
+ */
+ iterator
+ end()
+ { return this->_M_impl._M_finish; }
+
+ /**
+ * Returns a read-only (constant) iterator that points one past
+ * the last element in the %deque. Iteration is done in
+ * ordinary element order.
+ */
+ const_iterator
+ end() const
+ { return this->_M_impl._M_finish; }
+
+ /**
+ * Returns a read/write reverse iterator that points to the
+ * last element in the %deque. Iteration is done in reverse
+ * element order.
+ */
+ reverse_iterator
+ rbegin()
+ { return reverse_iterator(this->_M_impl._M_finish); }
+
+ /**
+ * Returns a read-only (constant) reverse iterator that points
+ * to the last element in the %deque. Iteration is done in
+ * reverse element order.
+ */
+ const_reverse_iterator
+ rbegin() const
+ { return const_reverse_iterator(this->_M_impl._M_finish); }
+
+ /**
+ * Returns a read/write reverse iterator that points to one
+ * before the first element in the %deque. Iteration is done
+ * in reverse element order.
+ */
+ reverse_iterator
+ rend()
+ { return reverse_iterator(this->_M_impl._M_start); }
+
+ /**
+ * Returns a read-only (constant) reverse iterator that points
+ * to one before the first element in the %deque. Iteration is
+ * done in reverse element order.
+ */
+ const_reverse_iterator
+ rend() const
+ { return const_reverse_iterator(this->_M_impl._M_start); }
+
+ // [23.2.1.2] capacity
+ /** Returns the number of elements in the %deque. */
+ size_type
+ size() const
+ { return this->_M_impl._M_finish - this->_M_impl._M_start; }
+
+ /** Returns the size() of the largest possible %deque. */
+ size_type
+ max_size() const
+ { return _M_get_Tp_allocator().max_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, value_type __x = value_type())
+ {
+ const size_type __len = size();
+ if (__new_size < __len)
+ _M_erase_at_end(this->_M_impl._M_start + difference_type(__new_size));
+ else
+ insert(this->_M_impl._M_finish, __new_size - __len, __x);
+ }
- // called by the second initialize_dispatch above
- /** @{
- * @if maint
- * @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.
- * @endif
- */
- template <typename _InputIterator>
- void
- _M_range_initialize(_InputIterator __first, _InputIterator __last,
- input_iterator_tag);
+ /**
+ * Returns true if the %deque is empty. (Thus begin() would
+ * equal end().)
+ */
+ bool
+ empty() const
+ { return this->_M_impl._M_finish == this->_M_impl._M_start; }
+
+ // element access
+ /**
+ * @brief Subscript access to the data contained in the %deque.
+ * @param n The index of the element for which data should be
+ * accessed.
+ * @return Read/write reference to data.
+ *
+ * This operator allows for easy, array-style, data access.
+ * Note that data access with this operator is unchecked and
+ * out_of_range lookups are not defined. (For checked lookups
+ * see at().)
+ */
+ reference
+ operator[](size_type __n)
+ { return this->_M_impl._M_start[difference_type(__n)]; }
+
+ /**
+ * @brief Subscript access to the data contained in the %deque.
+ * @param n The index of the element for which data should be
+ * accessed.
+ * @return Read-only (constant) reference to data.
+ *
+ * This operator allows for easy, array-style, data access.
+ * Note that data access with this operator is unchecked and
+ * out_of_range lookups are not defined. (For checked lookups
+ * see at().)
+ */
+ const_reference
+ operator[](size_type __n) const
+ { return this->_M_impl._M_start[difference_type(__n)]; }
+
+ protected:
+ /// @if maint Safety check used only from at(). @endif
+ void
+ _M_range_check(size_type __n) const
+ {
+ if (__n >= this->size())
+ __throw_out_of_range(__N("deque::_M_range_check"));
+ }
- // called by the second initialize_dispatch above
- template <typename _ForwardIterator>
- void
- _M_range_initialize(_ForwardIterator __first, _ForwardIterator __last,
- forward_iterator_tag);
- /** @} */
+ 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];
+ }
- /**
- * @if maint
- * @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).
- * @endif
- */
- void
- _M_fill_initialize(const value_type& __value);
+ /**
+ * @brief Provides access to the data contained in the %deque.
+ * @param n The index of the element for which data should be
+ * accessed.
+ * @return Read-only (constant) reference to data.
+ * @throw std::out_of_range If @a n is an invalid index.
+ *
+ * This function provides for safer data access. The parameter is first
+ * checked that it is in the range of the deque. The function throws
+ * out_of_range if the check fails.
+ */
+ const_reference
+ at(size_type __n) const
+ {
+ _M_range_check(__n);
+ return (*this)[__n];
+ }
+ /**
+ * Returns a read/write reference to the data at the first
+ * element of the %deque.
+ */
+ reference
+ front()
+ { return *begin(); }
+
+ /**
+ * Returns a read-only (constant) reference to the data at the first
+ * element of the %deque.
+ */
+ const_reference
+ front() const
+ { return *begin(); }
+
+ /**
+ * Returns a read/write reference to the data at the last element of the
+ * %deque.
+ */
+ reference
+ back()
+ {
+ iterator __tmp = end();
+ --__tmp;
+ return *__tmp;
+ }
- // Internal assign functions follow. The *_aux functions do the actual
- // assignment work for the range versions.
+ /**
+ * Returns a read-only (constant) reference to the data at the last
+ * element of the %deque.
+ */
+ const_reference
+ back() const
+ {
+ const_iterator __tmp = end();
+ --__tmp;
+ return *__tmp;
+ }
- // called by the range assign to implement [23.1.1]/9
- template<typename _Integer>
- void
- _M_assign_dispatch(_Integer __n, _Integer __val, __true_type)
- {
- _M_fill_assign(static_cast<size_type>(__n),
- static_cast<value_type>(__val));
- }
+ // [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)
+ {
+ this->_M_impl.construct(this->_M_impl._M_start._M_cur - 1, __x);
+ --this->_M_impl._M_start._M_cur;
+ }
+ else
+ _M_push_front_aux(__x);
+ }
- // called by the range assign to implement [23.1.1]/9
- template<typename _InputIter>
- void
- _M_assign_dispatch(_InputIter __first, _InputIter __last, __false_type)
- {
- typedef typename iterator_traits<_InputIter>::iterator_category
- _IterCategory;
- _M_assign_aux(__first, __last, _IterCategory());
- }
+ /**
+ * @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)
+ {
+ this->_M_impl.construct(this->_M_impl._M_finish._M_cur, __x);
+ ++this->_M_impl._M_finish._M_cur;
+ }
+ else
+ _M_push_back_aux(__x);
+ }
- // called by the second assign_dispatch above
- template <typename _InputIterator>
- void
- _M_assign_aux(_InputIterator __first, _InputIterator __last,
- input_iterator_tag);
+ /**
+ * @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()
+ {
+ if (this->_M_impl._M_start._M_cur
+ != this->_M_impl._M_start._M_last - 1)
+ {
+ this->_M_impl.destroy(this->_M_impl._M_start._M_cur);
+ ++this->_M_impl._M_start._M_cur;
+ }
+ else
+ _M_pop_front_aux();
+ }
- // called by the second assign_dispatch above
- template <typename _ForwardIterator>
- void
- _M_assign_aux(_ForwardIterator __first, _ForwardIterator __last,
- forward_iterator_tag)
- {
- size_type __len = distance(__first, __last);
- if (__len > size()) {
- _ForwardIterator __mid = __first;
- advance(__mid, size());
- copy(__first, __mid, begin());
- insert(end(), __mid, __last);
+ /**
+ * @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()
+ {
+ if (this->_M_impl._M_finish._M_cur
+ != this->_M_impl._M_finish._M_first)
+ {
+ --this->_M_impl._M_finish._M_cur;
+ this->_M_impl.destroy(this->_M_impl._M_finish._M_cur);
+ }
+ else
+ _M_pop_back_aux();
}
- else
- erase(copy(__first, __last, begin()), end());
- }
- // 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())
- {
- fill(begin(), end(), __val);
- insert(end(), __n - size(), __val);
- }
- else
- {
- erase(begin() + __n, end());
- fill(begin(), end(), __val);
- }
- }
+ /**
+ * @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);
+
+ /**
+ * @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); }
+
+ /**
+ * @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 pos. This is known as "range insert."
+ */
+ 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());
+ }
+
+ /**
+ * @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 responsibilty.
+ */
+ iterator
+ erase(iterator __position);
+
+ /**
+ * @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 responsibilty.
+ */
+ iterator
+ erase(iterator __first, iterator __last);
+
+ /**
+ * @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.
+ */
+ void
+ swap(deque& __x)
+ {
+ std::swap(this->_M_impl._M_start, __x._M_impl._M_start);
+ std::swap(this->_M_impl._M_finish, __x._M_impl._M_finish);
+ std::swap(this->_M_impl._M_map, __x._M_impl._M_map);
+ std::swap(this->_M_impl._M_map_size, __x._M_impl._M_map_size);
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 431. Swapping containers with unequal allocators.
+ std::__alloc_swap<_Tp_alloc_type>::_S_do_it(_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 responsibilty.
+ */
+ void
+ clear()
+ { _M_erase_at_end(begin()); }
+
+ protected:
+ // Internal constructor functions follow.
+
+ // called by the range constructor to implement [23.1.1]/9
+ template<typename _Integer>
+ void
+ _M_initialize_dispatch(_Integer __n, _Integer __x, __true_type)
+ {
+ _M_initialize_map(__n);
+ _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)
+ {
+ typedef typename std::iterator_traits<_InputIterator>::
+ iterator_category _IterCategory;
+ _M_range_initialize(__first, __last, _IterCategory());
+ }
+
+ // called by the second initialize_dispatch above
+ //@{
+ /**
+ * @if maint
+ * @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.
+ * @endif
+ */
+ 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);
+ //@}
+
+ /**
+ * @if maint
+ * @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).
+ * @endif
+ */
+ void
+ _M_fill_initialize(const value_type& __value);
+
+ // Internal assign functions follow. The *_aux functions do the actual
+ // assignment work for the range versions.
+
+ // called by the range assign to implement [23.1.1]/9
+ template<typename _Integer>
+ void
+ _M_assign_dispatch(_Integer __n, _Integer __val, __true_type)
+ {
+ _M_fill_assign(static_cast<size_type>(__n),
+ static_cast<value_type>(__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)
+ {
+ typedef typename std::iterator_traits<_InputIterator>::
+ iterator_category _IterCategory;
+ _M_assign_aux(__first, __last, _IterCategory());
+ }
+
+ // 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());
+ insert(end(), __mid, __last);
+ }
+ 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);
+ insert(end(), __n - size(), __val);
+ }
+ else
+ {
+ _M_erase_at_end(begin() + difference_type(__n));
+ std::fill(begin(), end(), __val);
+ }
+ }
- /** @{
- * @if maint
- * @brief Helper functions for push_* and pop_*.
- * @endif
- */
- void _M_push_back_aux(const value_type&);
- void _M_push_front_aux(const value_type&);
-#ifdef _GLIBCPP_DEPRECATED
- void _M_push_back_aux();
- void _M_push_front_aux();
-#endif
- void _M_pop_back_aux();
- void _M_pop_front_aux();
- /** @} */
-
-
- // Internal insert functions follow. The *_aux functions do the actual
- // insertion work when all shortcuts fail.
-
- // called by the range insert to implement [23.1.1]/9
- template<typename _Integer>
- void
- _M_insert_dispatch(iterator __pos, _Integer __n, _Integer __x, __true_type)
- {
- _M_fill_insert(__pos, static_cast<size_type>(__n),
- static_cast<value_type>(__x));
- }
+ //@{
+ /**
+ * @if maint
+ * @brief Helper functions for push_* and pop_*.
+ * @endif
+ */
+ void _M_push_back_aux(const value_type&);
+
+ void _M_push_front_aux(const value_type&);
+
+ void _M_pop_back_aux();
+
+ void _M_pop_front_aux();
+ //@}
+
+ // Internal insert functions follow. The *_aux functions do the actual
+ // insertion work when all shortcuts fail.
+
+ // called by the range insert to implement [23.1.1]/9
+ template<typename _Integer>
+ void
+ _M_insert_dispatch(iterator __pos,
+ _Integer __n, _Integer __x, __true_type)
+ {
+ _M_fill_insert(__pos, static_cast<size_type>(__n),
+ static_cast<value_type>(__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)
+ {
+ typedef typename std::iterator_traits<_InputIterator>::
+ iterator_category _IterCategory;
+ _M_range_insert_aux(__pos, __first, __last, _IterCategory());
+ }
+
+ // 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)
+ iterator
+ _M_insert_aux(iterator __pos, const value_type& __x);
+
+ // 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);
+
+ void
+ _M_destroy_data_dispatch(iterator, iterator, __true_type) { }
+
+ void
+ _M_destroy_data_dispatch(iterator __first, iterator __last, __false_type)
+ { _M_destroy_data_aux(__first, __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>&)
+ {
+ typedef typename std::__is_scalar<value_type>::__type
+ _Has_trivial_destructor;
+ _M_destroy_data_dispatch(__first, __last, _Has_trivial_destructor());
+ }
- // 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)
- {
- typedef typename iterator_traits<_InputIterator>::iterator_category
- _IterCategory;
- _M_range_insert_aux(__pos, __first, __last, _IterCategory());
- }
+ // 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 the second insert_dispatch above
- template <typename _InputIterator>
- void
- _M_range_insert_aux(iterator __pos, _InputIterator __first,
- _InputIterator __last, input_iterator_tag);
+ // 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;
+ }
- // called by the second insert_dispatch above
- template <typename _ForwardIterator>
- void
- _M_range_insert_aux(iterator __pos, _ForwardIterator __first,
- _ForwardIterator __last, forward_iterator_tag);
+ //@{
+ /**
+ * @if maint
+ * @brief Memory-handling helpers for the previous internal insert
+ * functions.
+ * @endif
+ */
+ 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);
+ }
- // 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);
+ 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);
+ }
- // called by insert(p,x)
- iterator
- _M_insert_aux(iterator __pos, const value_type& __x);
+ void
+ _M_new_elements_at_front(size_type __new_elements);
+
+ void
+ _M_new_elements_at_back(size_type __new_elements);
+ //@}
+
+
+ //@{
+ /**
+ * @if maint
+ * @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.)
+ * @endif
+ */
+ 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);
+ }
- // called by insert(p,n,x) via fill_insert
- void
- _M_insert_aux(iterator __pos, size_type __n, const value_type& __x);
+ 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);
+ }
- // called by range_insert_aux for forward iterators
- template <typename _ForwardIterator>
- void
- _M_insert_aux(iterator __pos,
- _ForwardIterator __first, _ForwardIterator __last,
- size_type __n);
+ void
+ _M_reallocate_map(size_type __nodes_to_add, bool __add_at_front);
+ //@}
+ };
-#ifdef _GLIBCPP_DEPRECATED
- // unused, see comment in implementation
- iterator _M_insert_aux(iterator __pos);
-#endif
- /** @{
- * @if maint
- * @brief Memory-handling helpers for the previous internal insert functions.
- * @endif
- */
- iterator
- _M_reserve_elements_at_front(size_type __n)
- {
- size_type __vacancies = _M_start._M_cur - _M_start._M_first;
- if (__n > __vacancies)
- _M_new_elements_at_front(__n - __vacancies);
- return _M_start - difference_type(__n);
- }
-
- iterator
- _M_reserve_elements_at_back(size_type __n)
- {
- size_type __vacancies = (_M_finish._M_last - _M_finish._M_cur) - 1;
- if (__n > __vacancies)
- _M_new_elements_at_back(__n - __vacancies);
- return _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);
- /** @} */
-
-
- /** @{
- * @if maint
- * @brief Memory-handling helpers for the major %map.
+ /**
+ * @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.
*
- * 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.)
- * @endif
+ * 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.
*/
- void
- _M_reserve_map_at_back (size_type __nodes_to_add = 1)
- {
- if (__nodes_to_add + 1 > _M_map_size - (_M_finish._M_node - _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(_M_start._M_node - _M_map))
- _M_reallocate_map(__nodes_to_add, true);
- }
-
- void
- _M_reallocate_map(size_type __nodes_to_add, bool __add_at_front);
- /** @} */
-};
-
-
-/**
- * @brief Deque equality comparison.
- * @param x A %deque.
- * @param y A %deque of the same type as @a x.
- * @return True iff the size and elements of the deques are equal.
- *
- * This is an equivalence relation. It is linear in the size of the
- * deques. Deques are considered equivalent if their sizes are equal,
- * and if corresponding elements compare equal.
-*/
-template <typename _Tp, typename _Alloc>
-inline bool operator==(const deque<_Tp, _Alloc>& __x,
- const deque<_Tp, _Alloc>& __y)
-{
- return __x.size() == __y.size() &&
- equal(__x.begin(), __x.end(), __y.begin());
-}
-
-/**
- * @brief Deque ordering relation.
- * @param x A %deque.
- * @param y A %deque of the same type as @a x.
- * @return True iff @a x is lexographically 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::lexographical_compare() for how the determination is made.
-*/
-template <typename _Tp, typename _Alloc>
-inline bool operator<(const deque<_Tp, _Alloc>& __x,
- const deque<_Tp, _Alloc>& __y)
-{
- return lexicographical_compare(__x.begin(), __x.end(),
- __y.begin(), __y.end());
-}
-
-/// Based on operator==
-template <typename _Tp, typename _Alloc>
-inline bool operator!=(const deque<_Tp, _Alloc>& __x,
- const deque<_Tp, _Alloc>& __y) {
- return !(__x == __y);
-}
-
-/// Based on operator<
-template <typename _Tp, typename _Alloc>
-inline bool operator>(const deque<_Tp, _Alloc>& __x,
- const deque<_Tp, _Alloc>& __y) {
- return __y < __x;
-}
-
-/// Based on operator<
-template <typename _Tp, typename _Alloc>
-inline bool operator<=(const deque<_Tp, _Alloc>& __x,
- const deque<_Tp, _Alloc>& __y) {
- return !(__y < __x);
-}
-
-/// Based on operator<
-template <typename _Tp, typename _Alloc>
-inline bool operator>=(const deque<_Tp, _Alloc>& __x,
- const deque<_Tp, _Alloc>& __y) {
- return !(__x < __y);
-}
-
-/// See std::deque::swap().
-template <typename _Tp, typename _Alloc>
-inline void swap(deque<_Tp,_Alloc>& __x, deque<_Tp,_Alloc>& __y)
-{
- __x.swap(__y);
-}
-
-} // namespace std
-
-#endif /* __GLIBCPP_INTERNAL_DEQUE_H */
+ template<typename _Tp, typename _Alloc>
+ inline bool
+ operator==(const deque<_Tp, _Alloc>& __x,
+ const deque<_Tp, _Alloc>& __y)
+ { return __x.size() == __y.size()
+ && std::equal(__x.begin(), __x.end(), __y.begin()); }
+ /**
+ * @brief Deque ordering relation.
+ * @param x A %deque.
+ * @param y A %deque of the same type as @a x.
+ * @return True iff @a x is lexicographically less than @a y.
+ *
+ * This is a total ordering relation. It is linear in the size of the
+ * deques. The elements must be comparable with @c <.
+ *
+ * See std::lexicographical_compare() for how the determination is made.
+ */
+ template<typename _Tp, typename _Alloc>
+ inline bool
+ operator<(const deque<_Tp, _Alloc>& __x,
+ const deque<_Tp, _Alloc>& __y)
+ { return lexicographical_compare(__x.begin(), __x.end(),
+ __y.begin(), __y.end()); }
+
+ /// Based on operator==
+ template<typename _Tp, typename _Alloc>
+ inline bool
+ operator!=(const deque<_Tp, _Alloc>& __x,
+ const deque<_Tp, _Alloc>& __y)
+ { return !(__x == __y); }
+
+ /// Based on operator<
+ template<typename _Tp, typename _Alloc>
+ inline bool
+ operator>(const deque<_Tp, _Alloc>& __x,
+ const deque<_Tp, _Alloc>& __y)
+ { return __y < __x; }
+
+ /// Based on operator<
+ template<typename _Tp, typename _Alloc>
+ inline bool
+ operator<=(const deque<_Tp, _Alloc>& __x,
+ const deque<_Tp, _Alloc>& __y)
+ { return !(__y < __x); }
+
+ /// Based on operator<
+ template<typename _Tp, typename _Alloc>
+ inline bool
+ operator>=(const deque<_Tp, _Alloc>& __x,
+ const deque<_Tp, _Alloc>& __y)
+ { return !(__x < __y); }
+
+ /// See std::deque::swap().
+ template<typename _Tp, typename _Alloc>
+ inline void
+ swap(deque<_Tp,_Alloc>& __x, deque<_Tp,_Alloc>& __y)
+ { __x.swap(__y); }
+
+_GLIBCXX_END_NESTED_NAMESPACE
+
+#endif /* _DEQUE_H */
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