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gcc/libstdc++-v3/include/bits/stl_list.h
Jakub Jelinek 7adcbafe45 Update copyright years.
2022-01-03 10:42:10 +01:00

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// List implementation -*- C++ -*-
// Copyright (C) 2001-2022 Free Software Foundation, Inc.
// Copyright The GNU Toolchain Authors.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/*
*
* Copyright (c) 1994
* Hewlett-Packard Company
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Hewlett-Packard Company makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
*
* Copyright (c) 1996,1997
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*/
/** @file bits/stl_list.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{list}
*/
#ifndef _STL_LIST_H
#define _STL_LIST_H 1
#include <bits/concept_check.h>
#include <ext/alloc_traits.h>
#if __cplusplus >= 201103L
#include <initializer_list>
#include <bits/allocated_ptr.h>
#include <ext/aligned_buffer.h>
#endif
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace __detail
{
// Supporting structures are split into common and templated
// types; the latter publicly inherits from the former in an
// effort to reduce code duplication. This results in some
// "needless" static_cast'ing later on, but it's all safe
// downcasting.
/// Common part of a node in the %list.
struct _List_node_base
{
_List_node_base* _M_next;
_List_node_base* _M_prev;
static void
swap(_List_node_base& __x, _List_node_base& __y) _GLIBCXX_USE_NOEXCEPT;
void
_M_transfer(_List_node_base* const __first,
_List_node_base* const __last) _GLIBCXX_USE_NOEXCEPT;
void
_M_reverse() _GLIBCXX_USE_NOEXCEPT;
void
_M_hook(_List_node_base* const __position) _GLIBCXX_USE_NOEXCEPT;
void
_M_unhook() _GLIBCXX_USE_NOEXCEPT;
};
/// The %list node header.
struct _List_node_header : public _List_node_base
{
#if _GLIBCXX_USE_CXX11_ABI
std::size_t _M_size;
#endif
_List_node_header() _GLIBCXX_NOEXCEPT
{ _M_init(); }
#if __cplusplus >= 201103L
_List_node_header(_List_node_header&& __x) noexcept
: _List_node_base{ __x._M_next, __x._M_prev }
# if _GLIBCXX_USE_CXX11_ABI
, _M_size(__x._M_size)
# endif
{
if (__x._M_base()->_M_next == __x._M_base())
this->_M_next = this->_M_prev = this;
else
{
this->_M_next->_M_prev = this->_M_prev->_M_next = this->_M_base();
__x._M_init();
}
}
void
_M_move_nodes(_List_node_header&& __x)
{
_List_node_base* const __xnode = __x._M_base();
if (__xnode->_M_next == __xnode)
_M_init();
else
{
_List_node_base* const __node = this->_M_base();
__node->_M_next = __xnode->_M_next;
__node->_M_prev = __xnode->_M_prev;
__node->_M_next->_M_prev = __node->_M_prev->_M_next = __node;
# if _GLIBCXX_USE_CXX11_ABI
_M_size = __x._M_size;
# endif
__x._M_init();
}
}
#endif
void
_M_init() _GLIBCXX_NOEXCEPT
{
this->_M_next = this->_M_prev = this;
#if _GLIBCXX_USE_CXX11_ABI
this->_M_size = 0;
#endif
}
private:
_List_node_base* _M_base() { return this; }
};
// Used by list::sort to hold nodes being sorted.
struct _Scratch_list : _List_node_base
{
_Scratch_list() { _M_next = _M_prev = this; }
bool empty() const { return _M_next == this; }
void swap(_List_node_base& __l) { _List_node_base::swap(*this, __l); }
template<typename _Iter, typename _Cmp>
struct _Ptr_cmp
{
_Cmp _M_cmp;
bool
operator()(__detail::_List_node_base* __lhs,
__detail::_List_node_base* __rhs) /* not const */
{ return _M_cmp(*_Iter(__lhs), *_Iter(__rhs)); }
};
template<typename _Iter>
struct _Ptr_cmp<_Iter, void>
{
bool
operator()(__detail::_List_node_base* __lhs,
__detail::_List_node_base* __rhs) const
{ return *_Iter(__lhs) < *_Iter(__rhs); }
};
// Merge nodes from __x into *this. Both lists must be sorted wrt _Cmp.
template<typename _Cmp>
void
merge(_List_node_base& __x, _Cmp __comp)
{
_List_node_base* __first1 = _M_next;
_List_node_base* const __last1 = this;
_List_node_base* __first2 = __x._M_next;
_List_node_base* const __last2 = std::__addressof(__x);
while (__first1 != __last1 && __first2 != __last2)
{
if (__comp(__first2, __first1))
{
_List_node_base* __next = __first2->_M_next;
__first1->_M_transfer(__first2, __next);
__first2 = __next;
}
else
__first1 = __first1->_M_next;
}
if (__first2 != __last2)
this->_M_transfer(__first2, __last2);
}
// Splice the node at __i into *this.
void _M_take_one(_List_node_base* __i)
{ this->_M_transfer(__i, __i->_M_next); }
// Splice all nodes from *this after __i.
void _M_put_all(_List_node_base* __i)
{
if (!empty())
__i->_M_transfer(_M_next, this);
}
};
} // namespace detail
_GLIBCXX_BEGIN_NAMESPACE_CONTAINER
/// An actual node in the %list.
template<typename _Tp>
struct _List_node : public __detail::_List_node_base
{
#if __cplusplus >= 201103L
__gnu_cxx::__aligned_membuf<_Tp> _M_storage;
_Tp* _M_valptr() { return _M_storage._M_ptr(); }
_Tp const* _M_valptr() const { return _M_storage._M_ptr(); }
#else
_Tp _M_data;
_Tp* _M_valptr() { return std::__addressof(_M_data); }
_Tp const* _M_valptr() const { return std::__addressof(_M_data); }
#endif
};
/**
* @brief A list::iterator.
*
* All the functions are op overloads.
*/
template<typename _Tp>
struct _List_iterator
{
typedef _List_iterator<_Tp> _Self;
typedef _List_node<_Tp> _Node;
typedef ptrdiff_t difference_type;
typedef std::bidirectional_iterator_tag iterator_category;
typedef _Tp value_type;
typedef _Tp* pointer;
typedef _Tp& reference;
_List_iterator() _GLIBCXX_NOEXCEPT
: _M_node() { }
explicit
_List_iterator(__detail::_List_node_base* __x) _GLIBCXX_NOEXCEPT
: _M_node(__x) { }
_Self
_M_const_cast() const _GLIBCXX_NOEXCEPT
{ return *this; }
// Must downcast from _List_node_base to _List_node to get to value.
_GLIBCXX_NODISCARD
reference
operator*() const _GLIBCXX_NOEXCEPT
{ return *static_cast<_Node*>(_M_node)->_M_valptr(); }
_GLIBCXX_NODISCARD
pointer
operator->() const _GLIBCXX_NOEXCEPT
{ return static_cast<_Node*>(_M_node)->_M_valptr(); }
_Self&
operator++() _GLIBCXX_NOEXCEPT
{
_M_node = _M_node->_M_next;
return *this;
}
_Self
operator++(int) _GLIBCXX_NOEXCEPT
{
_Self __tmp = *this;
_M_node = _M_node->_M_next;
return __tmp;
}
_Self&
operator--() _GLIBCXX_NOEXCEPT
{
_M_node = _M_node->_M_prev;
return *this;
}
_Self
operator--(int) _GLIBCXX_NOEXCEPT
{
_Self __tmp = *this;
_M_node = _M_node->_M_prev;
return __tmp;
}
_GLIBCXX_NODISCARD
friend bool
operator==(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
{ return __x._M_node == __y._M_node; }
#if __cpp_impl_three_way_comparison < 201907L
_GLIBCXX_NODISCARD
friend bool
operator!=(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
{ return __x._M_node != __y._M_node; }
#endif
// The only member points to the %list element.
__detail::_List_node_base* _M_node;
};
/**
* @brief A list::const_iterator.
*
* All the functions are op overloads.
*/
template<typename _Tp>
struct _List_const_iterator
{
typedef _List_const_iterator<_Tp> _Self;
typedef const _List_node<_Tp> _Node;
typedef _List_iterator<_Tp> iterator;
typedef ptrdiff_t difference_type;
typedef std::bidirectional_iterator_tag iterator_category;
typedef _Tp value_type;
typedef const _Tp* pointer;
typedef const _Tp& reference;
_List_const_iterator() _GLIBCXX_NOEXCEPT
: _M_node() { }
explicit
_List_const_iterator(const __detail::_List_node_base* __x)
_GLIBCXX_NOEXCEPT
: _M_node(__x) { }
_List_const_iterator(const iterator& __x) _GLIBCXX_NOEXCEPT
: _M_node(__x._M_node) { }
iterator
_M_const_cast() const _GLIBCXX_NOEXCEPT
{ return iterator(const_cast<__detail::_List_node_base*>(_M_node)); }
// Must downcast from List_node_base to _List_node to get to value.
_GLIBCXX_NODISCARD
reference
operator*() const _GLIBCXX_NOEXCEPT
{ return *static_cast<_Node*>(_M_node)->_M_valptr(); }
_GLIBCXX_NODISCARD
pointer
operator->() const _GLIBCXX_NOEXCEPT
{ return static_cast<_Node*>(_M_node)->_M_valptr(); }
_Self&
operator++() _GLIBCXX_NOEXCEPT
{
_M_node = _M_node->_M_next;
return *this;
}
_Self
operator++(int) _GLIBCXX_NOEXCEPT
{
_Self __tmp = *this;
_M_node = _M_node->_M_next;
return __tmp;
}
_Self&
operator--() _GLIBCXX_NOEXCEPT
{
_M_node = _M_node->_M_prev;
return *this;
}
_Self
operator--(int) _GLIBCXX_NOEXCEPT
{
_Self __tmp = *this;
_M_node = _M_node->_M_prev;
return __tmp;
}
_GLIBCXX_NODISCARD
friend bool
operator==(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
{ return __x._M_node == __y._M_node; }
#if __cpp_impl_three_way_comparison < 201907L
_GLIBCXX_NODISCARD
friend bool
operator!=(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
{ return __x._M_node != __y._M_node; }
#endif
// The only member points to the %list element.
const __detail::_List_node_base* _M_node;
};
_GLIBCXX_BEGIN_NAMESPACE_CXX11
/// See bits/stl_deque.h's _Deque_base for an explanation.
template<typename _Tp, typename _Alloc>
class _List_base
{
protected:
typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
rebind<_Tp>::other _Tp_alloc_type;
typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Tp_alloc_traits;
typedef typename _Tp_alloc_traits::template
rebind<_List_node<_Tp> >::other _Node_alloc_type;
typedef __gnu_cxx::__alloc_traits<_Node_alloc_type> _Node_alloc_traits;
#if !_GLIBCXX_INLINE_VERSION
static size_t
_S_distance(const __detail::_List_node_base* __first,
const __detail::_List_node_base* __last)
{
size_t __n = 0;
while (__first != __last)
{
__first = __first->_M_next;
++__n;
}
return __n;
}
#endif
struct _List_impl
: public _Node_alloc_type
{
__detail::_List_node_header _M_node;
_List_impl() _GLIBCXX_NOEXCEPT_IF(
is_nothrow_default_constructible<_Node_alloc_type>::value)
: _Node_alloc_type()
{ }
_List_impl(const _Node_alloc_type& __a) _GLIBCXX_NOEXCEPT
: _Node_alloc_type(__a)
{ }
#if __cplusplus >= 201103L
_List_impl(_List_impl&&) = default;
_List_impl(_Node_alloc_type&& __a, _List_impl&& __x)
: _Node_alloc_type(std::move(__a)), _M_node(std::move(__x._M_node))
{ }
_List_impl(_Node_alloc_type&& __a) noexcept
: _Node_alloc_type(std::move(__a))
{ }
#endif
};
_List_impl _M_impl;
#if _GLIBCXX_USE_CXX11_ABI
size_t _M_get_size() const { return _M_impl._M_node._M_size; }
void _M_set_size(size_t __n) { _M_impl._M_node._M_size = __n; }
void _M_inc_size(size_t __n) { _M_impl._M_node._M_size += __n; }
void _M_dec_size(size_t __n) { _M_impl._M_node._M_size -= __n; }
# if !_GLIBCXX_INLINE_VERSION
size_t
_M_distance(const __detail::_List_node_base* __first,
const __detail::_List_node_base* __last) const
{ return _S_distance(__first, __last); }
// return the stored size
size_t _M_node_count() const { return _M_get_size(); }
# endif
#else
// dummy implementations used when the size is not stored
size_t _M_get_size() const { return 0; }
void _M_set_size(size_t) { }
void _M_inc_size(size_t) { }
void _M_dec_size(size_t) { }
# if !_GLIBCXX_INLINE_VERSION
size_t _M_distance(const void*, const void*) const { return 0; }
// count the number of nodes
size_t _M_node_count() const
{
return _S_distance(_M_impl._M_node._M_next,
std::__addressof(_M_impl._M_node));
}
# endif
#endif
typename _Node_alloc_traits::pointer
_M_get_node()
{ return _Node_alloc_traits::allocate(_M_impl, 1); }
void
_M_put_node(typename _Node_alloc_traits::pointer __p) _GLIBCXX_NOEXCEPT
{ _Node_alloc_traits::deallocate(_M_impl, __p, 1); }
public:
typedef _Alloc allocator_type;
_Node_alloc_type&
_M_get_Node_allocator() _GLIBCXX_NOEXCEPT
{ return _M_impl; }
const _Node_alloc_type&
_M_get_Node_allocator() const _GLIBCXX_NOEXCEPT
{ return _M_impl; }
#if __cplusplus >= 201103L
_List_base() = default;
#else
_List_base() { }
#endif
_List_base(const _Node_alloc_type& __a) _GLIBCXX_NOEXCEPT
: _M_impl(__a)
{ }
#if __cplusplus >= 201103L
_List_base(_List_base&&) = default;
# if !_GLIBCXX_INLINE_VERSION
_List_base(_List_base&& __x, _Node_alloc_type&& __a)
: _M_impl(std::move(__a))
{
if (__x._M_get_Node_allocator() == _M_get_Node_allocator())
_M_move_nodes(std::move(__x));
// else caller must move individual elements.
}
# endif
// Used when allocator is_always_equal.
_List_base(_Node_alloc_type&& __a, _List_base&& __x)
: _M_impl(std::move(__a), std::move(__x._M_impl))
{ }
// Used when allocator !is_always_equal.
_List_base(_Node_alloc_type&& __a)
: _M_impl(std::move(__a))
{ }
void
_M_move_nodes(_List_base&& __x)
{ _M_impl._M_node._M_move_nodes(std::move(__x._M_impl._M_node)); }
#endif
// This is what actually destroys the list.
~_List_base() _GLIBCXX_NOEXCEPT
{ _M_clear(); }
void
_M_clear() _GLIBCXX_NOEXCEPT;
void
_M_init() _GLIBCXX_NOEXCEPT
{ this->_M_impl._M_node._M_init(); }
};
/**
* @brief A standard container with linear time access to elements,
* and fixed time insertion/deletion at any point in the sequence.
*
* @ingroup sequences
*
* @tparam _Tp Type of element.
* @tparam _Alloc Allocator type, defaults to allocator<_Tp>.
*
* Meets the requirements of a <a href="tables.html#65">container</a>, a
* <a href="tables.html#66">reversible container</a>, and a
* <a href="tables.html#67">sequence</a>, including the
* <a href="tables.html#68">optional sequence requirements</a> with the
* %exception of @c at and @c operator[].
*
* This is a @e doubly @e linked %list. Traversal up and down the
* %list requires linear time, but adding and removing elements (or
* @e nodes) is done in constant time, regardless of where the
* change takes place. Unlike std::vector and std::deque,
* random-access iterators are not provided, so subscripting ( @c
* [] ) access is not allowed. For algorithms which only need
* sequential access, this lack makes no difference.
*
* Also unlike the other standard containers, std::list provides
* specialized algorithms %unique to linked lists, such as
* splicing, sorting, and in-place reversal.
*
* A couple points on memory allocation for list<Tp>:
*
* First, we never actually allocate a Tp, we allocate
* List_node<Tp>'s and trust [20.1.5]/4 to DTRT. This is to ensure
* that after elements from %list<X,Alloc1> are spliced into
* %list<X,Alloc2>, destroying the memory of the second %list is a
* valid operation, i.e., Alloc1 giveth and Alloc2 taketh away.
*
* Second, a %list conceptually represented as
* @code
* A <---> B <---> C <---> D
* @endcode
* is actually circular; a link exists between A and D. The %list
* class holds (as its only data member) a private list::iterator
* pointing to @e D, not to @e A! To get to the head of the %list,
* we start at the tail and move forward by one. When this member
* iterator's next/previous pointers refer to itself, the %list is
* %empty.
*/
template<typename _Tp, typename _Alloc = std::allocator<_Tp> >
class list : protected _List_base<_Tp, _Alloc>
{
#ifdef _GLIBCXX_CONCEPT_CHECKS
// concept requirements
typedef typename _Alloc::value_type _Alloc_value_type;
# if __cplusplus < 201103L
__glibcxx_class_requires(_Tp, _SGIAssignableConcept)
# endif
__glibcxx_class_requires2(_Tp, _Alloc_value_type, _SameTypeConcept)
#endif
#if __cplusplus >= 201103L
static_assert(is_same<typename remove_cv<_Tp>::type, _Tp>::value,
"std::list must have a non-const, non-volatile value_type");
# if __cplusplus > 201703L || defined __STRICT_ANSI__
static_assert(is_same<typename _Alloc::value_type, _Tp>::value,
"std::list must have the same value_type as its allocator");
# endif
#endif
typedef _List_base<_Tp, _Alloc> _Base;
typedef typename _Base::_Tp_alloc_type _Tp_alloc_type;
typedef typename _Base::_Tp_alloc_traits _Tp_alloc_traits;
typedef typename _Base::_Node_alloc_type _Node_alloc_type;
typedef typename _Base::_Node_alloc_traits _Node_alloc_traits;
public:
typedef _Tp value_type;
typedef typename _Tp_alloc_traits::pointer pointer;
typedef typename _Tp_alloc_traits::const_pointer const_pointer;
typedef typename _Tp_alloc_traits::reference reference;
typedef typename _Tp_alloc_traits::const_reference const_reference;
typedef _List_iterator<_Tp> iterator;
typedef _List_const_iterator<_Tp> 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:
// Note that pointers-to-_Node's can be ctor-converted to
// iterator types.
typedef _List_node<_Tp> _Node;
using _Base::_M_impl;
using _Base::_M_put_node;
using _Base::_M_get_node;
using _Base::_M_get_Node_allocator;
/**
* @param __args An instance of user data.
*
* Allocates space for a new node and constructs a copy of
* @a __args in it.
*/
#if __cplusplus < 201103L
_Node*
_M_create_node(const value_type& __x)
{
_Node* __p = this->_M_get_node();
__try
{
_Tp_alloc_type __alloc(_M_get_Node_allocator());
__alloc.construct(__p->_M_valptr(), __x);
}
__catch(...)
{
_M_put_node(__p);
__throw_exception_again;
}
return __p;
}
#else
template<typename... _Args>
_Node*
_M_create_node(_Args&&... __args)
{
auto __p = this->_M_get_node();
auto& __alloc = _M_get_Node_allocator();
__allocated_ptr<_Node_alloc_type> __guard{__alloc, __p};
_Node_alloc_traits::construct(__alloc, __p->_M_valptr(),
std::forward<_Args>(__args)...);
__guard = nullptr;
return __p;
}
#endif
#if _GLIBCXX_USE_CXX11_ABI
static size_t
_S_distance(const_iterator __first, const_iterator __last)
{ return std::distance(__first, __last); }
// return the stored size
size_t
_M_node_count() const
{ return this->_M_get_size(); }
#else
// dummy implementations used when the size is not stored
static size_t
_S_distance(const_iterator, const_iterator)
{ return 0; }
// count the number of nodes
size_t
_M_node_count() const
{ return std::distance(begin(), end()); }
#endif
public:
// [23.2.2.1] construct/copy/destroy
// (assign() and get_allocator() are also listed in this section)
/**
* @brief Creates a %list with no elements.
*/
#if __cplusplus >= 201103L
list() = default;
#else
list() { }
#endif
/**
* @brief Creates a %list with no elements.
* @param __a An allocator object.
*/
explicit
list(const allocator_type& __a) _GLIBCXX_NOEXCEPT
: _Base(_Node_alloc_type(__a)) { }
#if __cplusplus >= 201103L
/**
* @brief Creates a %list with default constructed elements.
* @param __n The number of elements to initially create.
* @param __a An allocator object.
*
* This constructor fills the %list with @a __n default
* constructed elements.
*/
explicit
list(size_type __n, const allocator_type& __a = allocator_type())
: _Base(_Node_alloc_type(__a))
{ _M_default_initialize(__n); }
/**
* @brief Creates a %list with copies of an exemplar element.
* @param __n The number of elements to initially create.
* @param __value An element to copy.
* @param __a An allocator object.
*
* This constructor fills the %list with @a __n copies of @a __value.
*/
list(size_type __n, const value_type& __value,
const allocator_type& __a = allocator_type())
: _Base(_Node_alloc_type(__a))
{ _M_fill_initialize(__n, __value); }
#else
/**
* @brief Creates a %list with copies of an exemplar element.
* @param __n The number of elements to initially create.
* @param __value An element to copy.
* @param __a An allocator object.
*
* This constructor fills the %list with @a __n copies of @a __value.
*/
explicit
list(size_type __n, const value_type& __value = value_type(),
const allocator_type& __a = allocator_type())
: _Base(_Node_alloc_type(__a))
{ _M_fill_initialize(__n, __value); }
#endif
/**
* @brief %List copy constructor.
* @param __x A %list of identical element and allocator types.
*
* The newly-created %list uses a copy of the allocation object used
* by @a __x (unless the allocator traits dictate a different object).
*/
list(const list& __x)
: _Base(_Node_alloc_traits::
_S_select_on_copy(__x._M_get_Node_allocator()))
{ _M_initialize_dispatch(__x.begin(), __x.end(), __false_type()); }
#if __cplusplus >= 201103L
/**
* @brief %List move constructor.
*
* The newly-created %list contains the exact contents of the moved
* instance. The contents of the moved instance are a valid, but
* unspecified %list.
*/
list(list&&) = default;
/**
* @brief Builds a %list from an initializer_list
* @param __l An initializer_list of value_type.
* @param __a An allocator object.
*
* Create a %list consisting of copies of the elements in the
* initializer_list @a __l. This is linear in __l.size().
*/
list(initializer_list<value_type> __l,
const allocator_type& __a = allocator_type())
: _Base(_Node_alloc_type(__a))
{ _M_initialize_dispatch(__l.begin(), __l.end(), __false_type()); }
list(const list& __x, const __type_identity_t<allocator_type>& __a)
: _Base(_Node_alloc_type(__a))
{ _M_initialize_dispatch(__x.begin(), __x.end(), __false_type()); }
private:
list(list&& __x, const allocator_type& __a, true_type) noexcept
: _Base(_Node_alloc_type(__a), std::move(__x))
{ }
list(list&& __x, const allocator_type& __a, false_type)
: _Base(_Node_alloc_type(__a))
{
if (__x._M_get_Node_allocator() == this->_M_get_Node_allocator())
this->_M_move_nodes(std::move(__x));
else
insert(begin(), std::__make_move_if_noexcept_iterator(__x.begin()),
std::__make_move_if_noexcept_iterator(__x.end()));
}
public:
list(list&& __x, const __type_identity_t<allocator_type>& __a)
noexcept(_Node_alloc_traits::_S_always_equal())
: list(std::move(__x), __a,
typename _Node_alloc_traits::is_always_equal{})
{ }
#endif
/**
* @brief Builds a %list from a range.
* @param __first An input iterator.
* @param __last An input iterator.
* @param __a An allocator object.
*
* Create a %list consisting of copies of the elements from
* [@a __first,@a __last). This is linear in N (where N is
* distance(@a __first,@a __last)).
*/
#if __cplusplus >= 201103L
template<typename _InputIterator,
typename = std::_RequireInputIter<_InputIterator>>
list(_InputIterator __first, _InputIterator __last,
const allocator_type& __a = allocator_type())
: _Base(_Node_alloc_type(__a))
{ _M_initialize_dispatch(__first, __last, __false_type()); }
#else
template<typename _InputIterator>
list(_InputIterator __first, _InputIterator __last,
const allocator_type& __a = allocator_type())
: _Base(_Node_alloc_type(__a))
{
// Check whether it's an integral type. If so, it's not an iterator.
typedef typename std::__is_integer<_InputIterator>::__type _Integral;
_M_initialize_dispatch(__first, __last, _Integral());
}
#endif
#if __cplusplus >= 201103L
/**
* No explicit dtor needed as the _Base dtor takes care of
* things. The _Base dtor only erases the elements, and note
* that if the elements themselves are pointers, the pointed-to
* memory is not touched in any way. Managing the pointer is
* the user's responsibility.
*/
~list() = default;
#endif
/**
* @brief %List assignment operator.
* @param __x A %list of identical element and allocator types.
*
* All the elements of @a __x are copied.
*
* Whether the allocator is copied depends on the allocator traits.
*/
list&
operator=(const list& __x);
#if __cplusplus >= 201103L
/**
* @brief %List move assignment operator.
* @param __x A %list of identical element and allocator types.
*
* The contents of @a __x are moved into this %list (without copying).
*
* Afterwards @a __x is a valid, but unspecified %list
*
* Whether the allocator is moved depends on the allocator traits.
*/
list&
operator=(list&& __x)
noexcept(_Node_alloc_traits::_S_nothrow_move())
{
constexpr bool __move_storage =
_Node_alloc_traits::_S_propagate_on_move_assign()
|| _Node_alloc_traits::_S_always_equal();
_M_move_assign(std::move(__x), __bool_constant<__move_storage>());
return *this;
}
/**
* @brief %List initializer list assignment operator.
* @param __l An initializer_list of value_type.
*
* Replace the contents of the %list with copies of the elements
* in the initializer_list @a __l. This is linear in l.size().
*/
list&
operator=(initializer_list<value_type> __l)
{
this->assign(__l.begin(), __l.end());
return *this;
}
#endif
/**
* @brief Assigns a given value to a %list.
* @param __n Number of elements to be assigned.
* @param __val Value to be assigned.
*
* This function fills a %list with @a __n copies of the given
* value. Note that the assignment completely changes the %list
* and that the resulting %list's size is the same as the number
* of elements assigned.
*/
void
assign(size_type __n, const value_type& __val)
{ _M_fill_assign(__n, __val); }
/**
* @brief Assigns a range to a %list.
* @param __first An input iterator.
* @param __last An input iterator.
*
* This function fills a %list with copies of the elements in the
* range [@a __first,@a __last).
*
* Note that the assignment completely changes the %list and
* that the resulting %list's size is the same as the number of
* elements assigned.
*/
#if __cplusplus >= 201103L
template<typename _InputIterator,
typename = std::_RequireInputIter<_InputIterator>>
void
assign(_InputIterator __first, _InputIterator __last)
{ _M_assign_dispatch(__first, __last, __false_type()); }
#else
template<typename _InputIterator>
void
assign(_InputIterator __first, _InputIterator __last)
{
// Check whether it's an integral type. If so, it's not an iterator.
typedef typename std::__is_integer<_InputIterator>::__type _Integral;
_M_assign_dispatch(__first, __last, _Integral());
}
#endif
#if __cplusplus >= 201103L
/**
* @brief Assigns an initializer_list to a %list.
* @param __l An initializer_list of value_type.
*
* Replace the contents of the %list with copies of the elements
* in the initializer_list @a __l. This is linear in __l.size().
*/
void
assign(initializer_list<value_type> __l)
{ this->_M_assign_dispatch(__l.begin(), __l.end(), __false_type()); }
#endif
/// Get a copy of the memory allocation object.
allocator_type
get_allocator() const _GLIBCXX_NOEXCEPT
{ return allocator_type(_Base::_M_get_Node_allocator()); }
// iterators
/**
* Returns a read/write iterator that points to the first element in the
* %list. Iteration is done in ordinary element order.
*/
_GLIBCXX_NODISCARD
iterator
begin() _GLIBCXX_NOEXCEPT
{ return iterator(this->_M_impl._M_node._M_next); }
/**
* Returns a read-only (constant) iterator that points to the
* first element in the %list. Iteration is done in ordinary
* element order.
*/
_GLIBCXX_NODISCARD
const_iterator
begin() const _GLIBCXX_NOEXCEPT
{ return const_iterator(this->_M_impl._M_node._M_next); }
/**
* Returns a read/write iterator that points one past the last
* element in the %list. Iteration is done in ordinary element
* order.
*/
_GLIBCXX_NODISCARD
iterator
end() _GLIBCXX_NOEXCEPT
{ return iterator(&this->_M_impl._M_node); }
/**
* Returns a read-only (constant) iterator that points one past
* the last element in the %list. Iteration is done in ordinary
* element order.
*/
_GLIBCXX_NODISCARD
const_iterator
end() const _GLIBCXX_NOEXCEPT
{ return const_iterator(&this->_M_impl._M_node); }
/**
* Returns a read/write reverse iterator that points to the last
* element in the %list. Iteration is done in reverse element
* order.
*/
_GLIBCXX_NODISCARD
reverse_iterator
rbegin() _GLIBCXX_NOEXCEPT
{ return reverse_iterator(end()); }
/**
* Returns a read-only (constant) reverse iterator that points to
* the last element in the %list. Iteration is done in reverse
* element order.
*/
_GLIBCXX_NODISCARD
const_reverse_iterator
rbegin() const _GLIBCXX_NOEXCEPT
{ return const_reverse_iterator(end()); }
/**
* Returns a read/write reverse iterator that points to one
* before the first element in the %list. Iteration is done in
* reverse element order.
*/
_GLIBCXX_NODISCARD
reverse_iterator
rend() _GLIBCXX_NOEXCEPT
{ return reverse_iterator(begin()); }
/**
* Returns a read-only (constant) reverse iterator that points to one
* before the first element in the %list. Iteration is done in reverse
* element order.
*/
_GLIBCXX_NODISCARD
const_reverse_iterator
rend() const _GLIBCXX_NOEXCEPT
{ return const_reverse_iterator(begin()); }
#if __cplusplus >= 201103L
/**
* Returns a read-only (constant) iterator that points to the
* first element in the %list. Iteration is done in ordinary
* element order.
*/
[[__nodiscard__]]
const_iterator
cbegin() const noexcept
{ return const_iterator(this->_M_impl._M_node._M_next); }
/**
* Returns a read-only (constant) iterator that points one past
* the last element in the %list. Iteration is done in ordinary
* element order.
*/
[[__nodiscard__]]
const_iterator
cend() const noexcept
{ return const_iterator(&this->_M_impl._M_node); }
/**
* Returns a read-only (constant) reverse iterator that points to
* the last element in the %list. Iteration is done in reverse
* element order.
*/
[[__nodiscard__]]
const_reverse_iterator
crbegin() const noexcept
{ return const_reverse_iterator(end()); }
/**
* Returns a read-only (constant) reverse iterator that points to one
* before the first element in the %list. Iteration is done in reverse
* element order.
*/
[[__nodiscard__]]
const_reverse_iterator
crend() const noexcept
{ return const_reverse_iterator(begin()); }
#endif
// [23.2.2.2] capacity
/**
* Returns true if the %list is empty. (Thus begin() would equal
* end().)
*/
_GLIBCXX_NODISCARD bool
empty() const _GLIBCXX_NOEXCEPT
{ return this->_M_impl._M_node._M_next == &this->_M_impl._M_node; }
/** Returns the number of elements in the %list. */
_GLIBCXX_NODISCARD
size_type
size() const _GLIBCXX_NOEXCEPT
{ return _M_node_count(); }
/** Returns the size() of the largest possible %list. */
_GLIBCXX_NODISCARD
size_type
max_size() const _GLIBCXX_NOEXCEPT
{ return _Node_alloc_traits::max_size(_M_get_Node_allocator()); }
#if __cplusplus >= 201103L
/**
* @brief Resizes the %list to the specified number of elements.
* @param __new_size Number of elements the %list should contain.
*
* This function will %resize the %list to the specified number
* of elements. If the number is smaller than the %list's
* current size the %list is truncated, otherwise default
* constructed elements are appended.
*/
void
resize(size_type __new_size);
/**
* @brief Resizes the %list to the specified number of elements.
* @param __new_size Number of elements the %list should contain.
* @param __x Data with which new elements should be populated.
*
* This function will %resize the %list to the specified number
* of elements. If the number is smaller than the %list's
* current size the %list is truncated, otherwise the %list is
* extended and new elements are populated with given data.
*/
void
resize(size_type __new_size, const value_type& __x);
#else
/**
* @brief Resizes the %list to the specified number of elements.
* @param __new_size Number of elements the %list should contain.
* @param __x Data with which new elements should be populated.
*
* This function will %resize the %list to the specified number
* of elements. If the number is smaller than the %list's
* current size the %list is truncated, otherwise the %list is
* extended and new elements are populated with given data.
*/
void
resize(size_type __new_size, value_type __x = value_type());
#endif
// element access
/**
* Returns a read/write reference to the data at the first
* element of the %list.
*/
_GLIBCXX_NODISCARD
reference
front() _GLIBCXX_NOEXCEPT
{ return *begin(); }
/**
* Returns a read-only (constant) reference to the data at the first
* element of the %list.
*/
_GLIBCXX_NODISCARD
const_reference
front() const _GLIBCXX_NOEXCEPT
{ return *begin(); }
/**
* Returns a read/write reference to the data at the last element
* of the %list.
*/
_GLIBCXX_NODISCARD
reference
back() _GLIBCXX_NOEXCEPT
{
iterator __tmp = end();
--__tmp;
return *__tmp;
}
/**
* Returns a read-only (constant) reference to the data at the last
* element of the %list.
*/
_GLIBCXX_NODISCARD
const_reference
back() const _GLIBCXX_NOEXCEPT
{
const_iterator __tmp = end();
--__tmp;
return *__tmp;
}
// [23.2.2.3] modifiers
/**
* @brief Add data to the front of the %list.
* @param __x Data to be added.
*
* This is a typical stack operation. The function creates an
* element at the front of the %list and assigns the given data
* to it. Due to the nature of a %list this operation can be
* done in constant time, and does not invalidate iterators and
* references.
*/
void
push_front(const value_type& __x)
{ this->_M_insert(begin(), __x); }
#if __cplusplus >= 201103L
void
push_front(value_type&& __x)
{ this->_M_insert(begin(), std::move(__x)); }
template<typename... _Args>
#if __cplusplus > 201402L
reference
#else
void
#endif
emplace_front(_Args&&... __args)
{
this->_M_insert(begin(), std::forward<_Args>(__args)...);
#if __cplusplus > 201402L
return front();
#endif
}
#endif
/**
* @brief Removes first element.
*
* This is a typical stack operation. It shrinks the %list by
* one. Due to the nature of a %list this operation can be done
* in constant time, and only invalidates iterators/references to
* the element being removed.
*
* Note that no data is returned, and if the first element's data
* is needed, it should be retrieved before pop_front() is
* called.
*/
void
pop_front() _GLIBCXX_NOEXCEPT
{ this->_M_erase(begin()); }
/**
* @brief Add data to the end of the %list.
* @param __x Data to be added.
*
* This is a typical stack operation. The function creates an
* element at the end of the %list and assigns the given data to
* it. Due to the nature of a %list this operation can be done
* in constant time, and does not invalidate iterators and
* references.
*/
void
push_back(const value_type& __x)
{ this->_M_insert(end(), __x); }
#if __cplusplus >= 201103L
void
push_back(value_type&& __x)
{ this->_M_insert(end(), std::move(__x)); }
template<typename... _Args>
#if __cplusplus > 201402L
reference
#else
void
#endif
emplace_back(_Args&&... __args)
{
this->_M_insert(end(), std::forward<_Args>(__args)...);
#if __cplusplus > 201402L
return back();
#endif
}
#endif
/**
* @brief Removes last element.
*
* This is a typical stack operation. It shrinks the %list by
* one. Due to the nature of a %list this operation can be done
* in constant time, and only invalidates iterators/references to
* the element being removed.
*
* Note that no data is returned, and if the last element's data
* is needed, it should be retrieved before pop_back() is called.
*/
void
pop_back() _GLIBCXX_NOEXCEPT
{ this->_M_erase(iterator(this->_M_impl._M_node._M_prev)); }
#if __cplusplus >= 201103L
/**
* @brief Constructs object in %list before specified iterator.
* @param __position A const_iterator into the %list.
* @param __args Arguments.
* @return An iterator that points to the inserted data.
*
* This function will insert an object of type T constructed
* with T(std::forward<Args>(args)...) before the specified
* location. Due to the nature of a %list this operation can
* be done in constant time, and does not invalidate iterators
* and references.
*/
template<typename... _Args>
iterator
emplace(const_iterator __position, _Args&&... __args);
/**
* @brief Inserts given value into %list before specified iterator.
* @param __position A const_iterator into the %list.
* @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. Due to the nature of a %list this
* operation can be done in constant time, and does not
* invalidate iterators and references.
*/
iterator
insert(const_iterator __position, const value_type& __x);
#else
/**
* @brief Inserts given value into %list before specified iterator.
* @param __position An iterator into the %list.
* @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. Due to the nature of a %list this
* operation can be done in constant time, and does not
* invalidate iterators and references.
*/
iterator
insert(iterator __position, const value_type& __x);
#endif
#if __cplusplus >= 201103L
/**
* @brief Inserts given rvalue into %list before specified iterator.
* @param __position A const_iterator into the %list.
* @param __x Data to be inserted.
* @return An iterator that points to the inserted data.
*
* This function will insert a copy of the given rvalue before
* the specified location. Due to the nature of a %list this
* operation can be done in constant time, and does not
* invalidate iterators and references.
*/
iterator
insert(const_iterator __position, value_type&& __x)
{ return emplace(__position, std::move(__x)); }
/**
* @brief Inserts the contents of an initializer_list into %list
* before specified const_iterator.
* @param __p A const_iterator into the %list.
* @param __l An initializer_list of value_type.
* @return An iterator pointing to the first element inserted
* (or __position).
*
* This function will insert copies of the data in the
* initializer_list @a l into the %list before the location
* specified by @a p.
*
* This operation is linear in the number of elements inserted and
* does not invalidate iterators and references.
*/
iterator
insert(const_iterator __p, initializer_list<value_type> __l)
{ return this->insert(__p, __l.begin(), __l.end()); }
#endif
#if __cplusplus >= 201103L
/**
* @brief Inserts a number of copies of given data into the %list.
* @param __position A const_iterator into the %list.
* @param __n Number of elements to be inserted.
* @param __x Data to be inserted.
* @return An iterator pointing to the first element inserted
* (or __position).
*
* This function will insert a specified number of copies of the
* given data before the location specified by @a position.
*
* This operation is linear in the number of elements inserted and
* does not invalidate iterators and references.
*/
iterator
insert(const_iterator __position, size_type __n, const value_type& __x);
#else
/**
* @brief Inserts a number of copies of given data into the %list.
* @param __position An iterator into the %list.
* @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.
*
* This operation is linear in the number of elements inserted and
* does not invalidate iterators and references.
*/
void
insert(iterator __position, size_type __n, const value_type& __x)
{
list __tmp(__n, __x, get_allocator());
splice(__position, __tmp);
}
#endif
#if __cplusplus >= 201103L
/**
* @brief Inserts a range into the %list.
* @param __position A const_iterator into the %list.
* @param __first An input iterator.
* @param __last An input iterator.
* @return An iterator pointing to the first element inserted
* (or __position).
*
* This function will insert copies of the data in the range [@a
* first,@a last) into the %list before the location specified by
* @a position.
*
* This operation is linear in the number of elements inserted and
* does not invalidate iterators and references.
*/
template<typename _InputIterator,
typename = std::_RequireInputIter<_InputIterator>>
iterator
insert(const_iterator __position, _InputIterator __first,
_InputIterator __last);
#else
/**
* @brief Inserts a range into the %list.
* @param __position An iterator into the %list.
* @param __first An input iterator.
* @param __last An input iterator.
*
* This function will insert copies of the data in the range [@a
* first,@a last) into the %list before the location specified by
* @a position.
*
* This operation is linear in the number of elements inserted and
* does not invalidate iterators and references.
*/
template<typename _InputIterator>
void
insert(iterator __position, _InputIterator __first,
_InputIterator __last)
{
list __tmp(__first, __last, get_allocator());
splice(__position, __tmp);
}
#endif
/**
* @brief Remove element at given position.
* @param __position Iterator pointing to element to be erased.
* @return An iterator pointing to the next element (or end()).
*
* This function will erase the element at the given position and thus
* shorten the %list by one.
*
* Due to the nature of a %list this operation can be done in
* constant time, and only invalidates iterators/references to
* the element being removed. The user is also cautioned that
* this function only erases the element, and that if the element
* is itself a pointer, the pointed-to memory is not touched in
* any way. Managing the pointer is the user's responsibility.
*/
iterator
#if __cplusplus >= 201103L
erase(const_iterator __position) noexcept;
#else
erase(iterator __position);
#endif
/**
* @brief Remove a range of elements.
* @param __first Iterator pointing to the first element to be erased.
* @param __last Iterator pointing to one past the last element to be
* erased.
* @return An iterator pointing to the element pointed to by @a last
* prior to erasing (or end()).
*
* This function will erase the elements in the range @a
* [first,last) and shorten the %list accordingly.
*
* This operation is linear time in the size of the range and only
* invalidates iterators/references to the element being removed.
* The user is also cautioned that this function only erases the
* elements, and that if the elements themselves are pointers, the
* pointed-to memory is not touched in any way. Managing the pointer
* is the user's responsibility.
*/
iterator
#if __cplusplus >= 201103L
erase(const_iterator __first, const_iterator __last) noexcept
#else
erase(iterator __first, iterator __last)
#endif
{
while (__first != __last)
__first = erase(__first);
return __last._M_const_cast();
}
/**
* @brief Swaps data with another %list.
* @param __x A %list of the same element and allocator types.
*
* This exchanges the elements between two lists in constant
* time. Note that the global std::swap() function is
* specialized such that std::swap(l1,l2) will feed to this
* function.
*
* Whether the allocators are swapped depends on the allocator traits.
*/
void
swap(list& __x) _GLIBCXX_NOEXCEPT
{
__detail::_List_node_base::swap(this->_M_impl._M_node,
__x._M_impl._M_node);
size_t __xsize = __x._M_get_size();
__x._M_set_size(this->_M_get_size());
this->_M_set_size(__xsize);
_Node_alloc_traits::_S_on_swap(this->_M_get_Node_allocator(),
__x._M_get_Node_allocator());
}
/**
* Erases all the elements. Note that this function only erases
* the elements, and that if the elements themselves are
* pointers, the pointed-to memory is not touched in any way.
* Managing the pointer is the user's responsibility.
*/
void
clear() _GLIBCXX_NOEXCEPT
{
_Base::_M_clear();
_Base::_M_init();
}
// [23.2.2.4] list operations
/**
* @brief Insert contents of another %list.
* @param __position Iterator referencing the element to insert before.
* @param __x Source list.
*
* The elements of @a __x are inserted in constant time in front of
* the element referenced by @a __position. @a __x becomes an empty
* list.
*
* Requires this != @a __x.
*/
void
#if __cplusplus >= 201103L
splice(const_iterator __position, list&& __x) noexcept
#else
splice(iterator __position, list& __x)
#endif
{
if (!__x.empty())
{
_M_check_equal_allocators(__x);
this->_M_transfer(__position._M_const_cast(),
__x.begin(), __x.end());
this->_M_inc_size(__x._M_get_size());
__x._M_set_size(0);
}
}
#if __cplusplus >= 201103L
void
splice(const_iterator __position, list& __x) noexcept
{ splice(__position, std::move(__x)); }
#endif
#if __cplusplus >= 201103L
/**
* @brief Insert element from another %list.
* @param __position Const_iterator referencing the element to
* insert before.
* @param __x Source list.
* @param __i Const_iterator referencing the element to move.
*
* Removes the element in list @a __x referenced by @a __i and
* inserts it into the current list before @a __position.
*/
void
splice(const_iterator __position, list&& __x, const_iterator __i) noexcept
#else
/**
* @brief Insert element from another %list.
* @param __position Iterator referencing the element to insert before.
* @param __x Source list.
* @param __i Iterator referencing the element to move.
*
* Removes the element in list @a __x referenced by @a __i and
* inserts it into the current list before @a __position.
*/
void
splice(iterator __position, list& __x, iterator __i)
#endif
{
iterator __j = __i._M_const_cast();
++__j;
if (__position == __i || __position == __j)
return;
if (this != std::__addressof(__x))
_M_check_equal_allocators(__x);
this->_M_transfer(__position._M_const_cast(),
__i._M_const_cast(), __j);
this->_M_inc_size(1);
__x._M_dec_size(1);
}
#if __cplusplus >= 201103L
/**
* @brief Insert element from another %list.
* @param __position Const_iterator referencing the element to
* insert before.
* @param __x Source list.
* @param __i Const_iterator referencing the element to move.
*
* Removes the element in list @a __x referenced by @a __i and
* inserts it into the current list before @a __position.
*/
void
splice(const_iterator __position, list& __x, const_iterator __i) noexcept
{ splice(__position, std::move(__x), __i); }
#endif
#if __cplusplus >= 201103L
/**
* @brief Insert range from another %list.
* @param __position Const_iterator referencing the element to
* insert before.
* @param __x Source list.
* @param __first Const_iterator referencing the start of range in x.
* @param __last Const_iterator referencing the end of range in x.
*
* Removes elements in the range [__first,__last) and inserts them
* before @a __position in constant time.
*
* Undefined if @a __position is in [__first,__last).
*/
void
splice(const_iterator __position, list&& __x, const_iterator __first,
const_iterator __last) noexcept
#else
/**
* @brief Insert range from another %list.
* @param __position Iterator referencing the element to insert before.
* @param __x Source list.
* @param __first Iterator referencing the start of range in x.
* @param __last Iterator referencing the end of range in x.
*
* Removes elements in the range [__first,__last) and inserts them
* before @a __position in constant time.
*
* Undefined if @a __position is in [__first,__last).
*/
void
splice(iterator __position, list& __x, iterator __first,
iterator __last)
#endif
{
if (__first != __last)
{
if (this != std::__addressof(__x))
_M_check_equal_allocators(__x);
size_t __n = _S_distance(__first, __last);
this->_M_inc_size(__n);
__x._M_dec_size(__n);
this->_M_transfer(__position._M_const_cast(),
__first._M_const_cast(),
__last._M_const_cast());
}
}
#if __cplusplus >= 201103L
/**
* @brief Insert range from another %list.
* @param __position Const_iterator referencing the element to
* insert before.
* @param __x Source list.
* @param __first Const_iterator referencing the start of range in x.
* @param __last Const_iterator referencing the end of range in x.
*
* Removes elements in the range [__first,__last) and inserts them
* before @a __position in constant time.
*
* Undefined if @a __position is in [__first,__last).
*/
void
splice(const_iterator __position, list& __x, const_iterator __first,
const_iterator __last) noexcept
{ splice(__position, std::move(__x), __first, __last); }
#endif
private:
#if __cplusplus > 201703L
# define __cpp_lib_list_remove_return_type 201806L
typedef size_type __remove_return_type;
# define _GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG \
__attribute__((__abi_tag__("__cxx20")))
#else
typedef void __remove_return_type;
# define _GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG
#endif
public:
/**
* @brief Remove all elements equal to value.
* @param __value The value to remove.
*
* Removes every element in the list equal to @a value.
* Remaining elements stay in list order. Note that this
* function only erases the elements, and that if the elements
* themselves are pointers, the pointed-to memory is not
* touched in any way. Managing the pointer is the user's
* responsibility.
*/
_GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG
__remove_return_type
remove(const _Tp& __value);
/**
* @brief Remove all elements satisfying a predicate.
* @tparam _Predicate Unary predicate function or object.
*
* Removes every element in the list for which the predicate
* returns true. Remaining elements stay in list order. Note
* that this function only erases the elements, and that if the
* elements themselves are pointers, the pointed-to memory is
* not touched in any way. Managing the pointer is the user's
* responsibility.
*/
template<typename _Predicate>
__remove_return_type
remove_if(_Predicate);
/**
* @brief Remove consecutive duplicate elements.
*
* For each consecutive set of elements with the same value,
* remove all but the first one. Remaining elements stay in
* list order. Note that this function only erases the
* elements, and that if the elements themselves are pointers,
* the pointed-to memory is not touched in any way. Managing
* the pointer is the user's responsibility.
*/
_GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG
__remove_return_type
unique();
/**
* @brief Remove consecutive elements satisfying a predicate.
* @tparam _BinaryPredicate Binary predicate function or object.
*
* For each consecutive set of elements [first,last) that
* satisfy predicate(first,i) where i is an iterator in
* [first,last), remove all but the first one. Remaining
* elements stay in list order. Note that this function only
* erases the elements, and that if the elements themselves are
* pointers, the pointed-to memory is not touched in any way.
* Managing the pointer is the user's responsibility.
*/
template<typename _BinaryPredicate>
__remove_return_type
unique(_BinaryPredicate);
#undef _GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG
/**
* @brief Merge sorted lists.
* @param __x Sorted list to merge.
*
* Assumes that both @a __x and this list are sorted according to
* operator<(). Merges elements of @a __x into this list in
* sorted order, leaving @a __x empty when complete. Elements in
* this list precede elements in @a __x that are equal.
*/
#if __cplusplus >= 201103L
void
merge(list&& __x);
void
merge(list& __x)
{ merge(std::move(__x)); }
#else
void
merge(list& __x);
#endif
/**
* @brief Merge sorted lists according to comparison function.
* @tparam _StrictWeakOrdering Comparison function defining
* sort order.
* @param __x Sorted list to merge.
* @param __comp Comparison functor.
*
* Assumes that both @a __x and this list are sorted according to
* StrictWeakOrdering. Merges elements of @a __x into this list
* in sorted order, leaving @a __x empty when complete. Elements
* in this list precede elements in @a __x that are equivalent
* according to StrictWeakOrdering().
*/
#if __cplusplus >= 201103L
template<typename _StrictWeakOrdering>
void
merge(list&& __x, _StrictWeakOrdering __comp);
template<typename _StrictWeakOrdering>
void
merge(list& __x, _StrictWeakOrdering __comp)
{ merge(std::move(__x), __comp); }
#else
template<typename _StrictWeakOrdering>
void
merge(list& __x, _StrictWeakOrdering __comp);
#endif
/**
* @brief Reverse the elements in list.
*
* Reverse the order of elements in the list in linear time.
*/
void
reverse() _GLIBCXX_NOEXCEPT
{ this->_M_impl._M_node._M_reverse(); }
/**
* @brief Sort the elements.
*
* Sorts the elements of this list in NlogN time. Equivalent
* elements remain in list order.
*/
void
sort();
/**
* @brief Sort the elements according to comparison function.
*
* Sorts the elements of this list in NlogN time. Equivalent
* elements remain in list order.
*/
template<typename _StrictWeakOrdering>
void
sort(_StrictWeakOrdering);
protected:
// Internal constructor functions follow.
// Called by the range constructor to implement [23.1.1]/9
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 438. Ambiguity in the "do the right thing" clause
template<typename _Integer>
void
_M_initialize_dispatch(_Integer __n, _Integer __x, __true_type)
{ _M_fill_initialize(static_cast<size_type>(__n), __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)
{
for (; __first != __last; ++__first)
#if __cplusplus >= 201103L
emplace_back(*__first);
#else
push_back(*__first);
#endif
}
// Called by list(n,v,a), and the range constructor when it turns out
// to be the same thing.
void
_M_fill_initialize(size_type __n, const value_type& __x)
{
for (; __n; --__n)
push_back(__x);
}
#if __cplusplus >= 201103L
// Called by list(n).
void
_M_default_initialize(size_type __n)
{
for (; __n; --__n)
emplace_back();
}
// Called by resize(sz).
void
_M_default_append(size_type __n);
#endif
// Internal assign functions follow.
// Called by the range assign to implement [23.1.1]/9
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 438. Ambiguity in the "do the right thing" clause
template<typename _Integer>
void
_M_assign_dispatch(_Integer __n, _Integer __val, __true_type)
{ _M_fill_assign(__n, __val); }
// Called by the range assign to implement [23.1.1]/9
template<typename _InputIterator>
void
_M_assign_dispatch(_InputIterator __first, _InputIterator __last,
__false_type);
// 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);
// Moves the elements from [first,last) before position.
void
_M_transfer(iterator __position, iterator __first, iterator __last)
{ __position._M_node->_M_transfer(__first._M_node, __last._M_node); }
// Inserts new element at position given and with value given.
#if __cplusplus < 201103L
void
_M_insert(iterator __position, const value_type& __x)
{
_Node* __tmp = _M_create_node(__x);
__tmp->_M_hook(__position._M_node);
this->_M_inc_size(1);
}
#else
template<typename... _Args>
void
_M_insert(iterator __position, _Args&&... __args)
{
_Node* __tmp = _M_create_node(std::forward<_Args>(__args)...);
__tmp->_M_hook(__position._M_node);
this->_M_inc_size(1);
}
#endif
// Erases element at position given.
void
_M_erase(iterator __position) _GLIBCXX_NOEXCEPT
{
this->_M_dec_size(1);
__position._M_node->_M_unhook();
_Node* __n = static_cast<_Node*>(__position._M_node);
#if __cplusplus >= 201103L
_Node_alloc_traits::destroy(_M_get_Node_allocator(), __n->_M_valptr());
#else
_Tp_alloc_type(_M_get_Node_allocator()).destroy(__n->_M_valptr());
#endif
_M_put_node(__n);
}
// To implement the splice (and merge) bits of N1599.
void
_M_check_equal_allocators(list& __x) _GLIBCXX_NOEXCEPT
{
if (std::__alloc_neq<typename _Base::_Node_alloc_type>::
_S_do_it(_M_get_Node_allocator(), __x._M_get_Node_allocator()))
__builtin_abort();
}
// Used to implement resize.
const_iterator
_M_resize_pos(size_type& __new_size) const;
#if __cplusplus >= 201103L
void
_M_move_assign(list&& __x, true_type) noexcept
{
this->clear();
this->_M_move_nodes(std::move(__x));
std::__alloc_on_move(this->_M_get_Node_allocator(),
__x._M_get_Node_allocator());
}
void
_M_move_assign(list&& __x, false_type)
{
if (__x._M_get_Node_allocator() == this->_M_get_Node_allocator())
_M_move_assign(std::move(__x), true_type{});
else
// The rvalue's allocator cannot be moved, or is not equal,
// so we need to individually move each element.
_M_assign_dispatch(std::make_move_iterator(__x.begin()),
std::make_move_iterator(__x.end()),
__false_type{});
}
#endif
#if _GLIBCXX_USE_CXX11_ABI
// Update _M_size members after merging (some of) __src into __dest.
struct _Finalize_merge
{
explicit
_Finalize_merge(list& __dest, list& __src, const iterator& __src_next)
: _M_dest(__dest), _M_src(__src), _M_next(__src_next)
{ }
~_Finalize_merge()
{
// For the common case, _M_next == _M_sec.end() and the std::distance
// call is fast. But if any *iter1 < *iter2 comparison throws then we
// have to count how many elements remain in _M_src.
const size_t __num_unmerged = std::distance(_M_next, _M_src.end());
const size_t __orig_size = _M_src._M_get_size();
_M_dest._M_inc_size(__orig_size - __num_unmerged);
_M_src._M_set_size(__num_unmerged);
}
list& _M_dest;
list& _M_src;
const iterator& _M_next;
#if __cplusplus >= 201103L
_Finalize_merge(const _Finalize_merge&) = delete;
#endif
};
#else
struct _Finalize_merge
{ explicit _Finalize_merge(list&, list&, const iterator&) { } };
#endif
};
#if __cpp_deduction_guides >= 201606
template<typename _InputIterator, typename _ValT
= typename iterator_traits<_InputIterator>::value_type,
typename _Allocator = allocator<_ValT>,
typename = _RequireInputIter<_InputIterator>,
typename = _RequireAllocator<_Allocator>>
list(_InputIterator, _InputIterator, _Allocator = _Allocator())
-> list<_ValT, _Allocator>;
#endif
_GLIBCXX_END_NAMESPACE_CXX11
/**
* @brief List equality comparison.
* @param __x A %list.
* @param __y A %list of the same type as @a __x.
* @return True iff the size and elements of the lists are equal.
*
* This is an equivalence relation. It is linear in the size of
* the lists. Lists are considered equivalent if their sizes are
* equal, and if corresponding elements compare equal.
*/
template<typename _Tp, typename _Alloc>
_GLIBCXX_NODISCARD
inline bool
operator==(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
{
#if _GLIBCXX_USE_CXX11_ABI
if (__x.size() != __y.size())
return false;
#endif
typedef typename list<_Tp, _Alloc>::const_iterator const_iterator;
const_iterator __end1 = __x.end();
const_iterator __end2 = __y.end();
const_iterator __i1 = __x.begin();
const_iterator __i2 = __y.begin();
while (__i1 != __end1 && __i2 != __end2 && *__i1 == *__i2)
{
++__i1;
++__i2;
}
return __i1 == __end1 && __i2 == __end2;
}
#if __cpp_lib_three_way_comparison
/**
* @brief List ordering relation.
* @param __x A `list`.
* @param __y A `list` of the same type as `__x`.
* @return A value indicating whether `__x` is less than, equal to,
* greater than, or incomparable with `__y`.
*
* See `std::lexicographical_compare_three_way()` for how the determination
* is made. This operator is used to synthesize relational operators like
* `<` and `>=` etc.
*/
template<typename _Tp, typename _Alloc>
[[nodiscard]]
inline __detail::__synth3way_t<_Tp>
operator<=>(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
{
return std::lexicographical_compare_three_way(__x.begin(), __x.end(),
__y.begin(), __y.end(),
__detail::__synth3way);
}
#else
/**
* @brief List ordering relation.
* @param __x A %list.
* @param __y A %list 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
* lists. The elements must be comparable with @c <.
*
* See std::lexicographical_compare() for how the determination is made.
*/
template<typename _Tp, typename _Alloc>
_GLIBCXX_NODISCARD
inline bool
operator<(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
{ return std::lexicographical_compare(__x.begin(), __x.end(),
__y.begin(), __y.end()); }
/// Based on operator==
template<typename _Tp, typename _Alloc>
_GLIBCXX_NODISCARD
inline bool
operator!=(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
{ return !(__x == __y); }
/// Based on operator<
template<typename _Tp, typename _Alloc>
_GLIBCXX_NODISCARD
inline bool
operator>(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
{ return __y < __x; }
/// Based on operator<
template<typename _Tp, typename _Alloc>
_GLIBCXX_NODISCARD
inline bool
operator<=(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
{ return !(__y < __x); }
/// Based on operator<
template<typename _Tp, typename _Alloc>
_GLIBCXX_NODISCARD
inline bool
operator>=(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
{ return !(__x < __y); }
#endif // three-way comparison
/// See std::list::swap().
template<typename _Tp, typename _Alloc>
inline void
swap(list<_Tp, _Alloc>& __x, list<_Tp, _Alloc>& __y)
_GLIBCXX_NOEXCEPT_IF(noexcept(__x.swap(__y)))
{ __x.swap(__y); }
_GLIBCXX_END_NAMESPACE_CONTAINER
#if _GLIBCXX_USE_CXX11_ABI
// Detect when distance is used to compute the size of the whole list.
template<typename _Tp>
inline ptrdiff_t
__distance(_GLIBCXX_STD_C::_List_iterator<_Tp> __first,
_GLIBCXX_STD_C::_List_iterator<_Tp> __last,
input_iterator_tag __tag)
{
typedef _GLIBCXX_STD_C::_List_const_iterator<_Tp> _CIter;
return std::__distance(_CIter(__first), _CIter(__last), __tag);
}
template<typename _Tp>
inline ptrdiff_t
__distance(_GLIBCXX_STD_C::_List_const_iterator<_Tp> __first,
_GLIBCXX_STD_C::_List_const_iterator<_Tp> __last,
input_iterator_tag)
{
typedef __detail::_List_node_header _Sentinel;
_GLIBCXX_STD_C::_List_const_iterator<_Tp> __beyond = __last;
++__beyond;
const bool __whole = __first == __beyond;
if (__builtin_constant_p (__whole) && __whole)
return static_cast<const _Sentinel*>(__last._M_node)->_M_size;
ptrdiff_t __n = 0;
while (__first != __last)
{
++__first;
++__n;
}
return __n;
}
#endif
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif /* _STL_LIST_H */
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