// List implementation -*- C++ -*-
-// Copyright (C) 2001-2015 Free Software Foundation, Inc.
+// Copyright (C) 2001-2024 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
namespace std _GLIBCXX_VISIBILITY(default)
{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
namespace __detail
{
- _GLIBCXX_BEGIN_NAMESPACE_VERSION
-
// 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.
+ /// Common part of a node in the %list.
struct _List_node_base
{
_List_node_base* _M_next;
_M_unhook() _GLIBCXX_USE_NOEXCEPT;
};
- _GLIBCXX_END_NAMESPACE_VERSION
+ /// 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
template<typename _Tp>
struct _List_iterator
{
- typedef _List_iterator<_Tp> _Self;
- typedef _List_node<_Tp> _Node;
+ 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;
+ 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() { }
{ 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(); }
return __tmp;
}
- bool
- operator==(const _Self& __x) const _GLIBCXX_NOEXCEPT
- { return _M_node == __x._M_node; }
+ _GLIBCXX_NODISCARD
+ friend bool
+ operator==(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
+ { return __x._M_node == __y._M_node; }
- bool
- operator!=(const _Self& __x) const _GLIBCXX_NOEXCEPT
- { return _M_node != __x._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;
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 _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;
+ 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() { }
{ 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(); }
return __tmp;
}
- bool
- operator==(const _Self& __x) const _GLIBCXX_NOEXCEPT
- { return _M_node == __x._M_node; }
+ _GLIBCXX_NODISCARD
+ friend bool
+ operator==(const _Self& __x, const _Self& __y) _GLIBCXX_NOEXCEPT
+ { return __x._M_node == __y._M_node; }
- bool
- operator!=(const _Self& __x) const _GLIBCXX_NOEXCEPT
- { return _M_node != __x._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;
};
- template<typename _Val>
- inline bool
- operator==(const _List_iterator<_Val>& __x,
- const _List_const_iterator<_Val>& __y) _GLIBCXX_NOEXCEPT
- { return __x._M_node == __y._M_node; }
-
- template<typename _Val>
- inline bool
- operator!=(const _List_iterator<_Val>& __x,
- const _List_const_iterator<_Val>& __y) _GLIBCXX_NOEXCEPT
- { return __x._M_node != __y._M_node; }
-
_GLIBCXX_BEGIN_NAMESPACE_CXX11
/// See bits/stl_deque.h's _Deque_base for an explanation.
template<typename _Tp, typename _Alloc>
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)
}
return __n;
}
+#endif
struct _List_impl
: public _Node_alloc_type
{
-#if _GLIBCXX_USE_CXX11_ABI
- _List_node<size_t> _M_node;
-#else
- __detail::_List_node_base _M_node;
-#endif
+ __detail::_List_node_header _M_node;
- _List_impl() _GLIBCXX_NOEXCEPT
- : _Node_alloc_type(), _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), _M_node()
+ : _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)), _M_node()
+ : _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_valptr(); }
+ 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_valptr() = __n; }
+ 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_valptr() += __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_valptr() -= __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_impl._M_node._M_valptr(); }
+ 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
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_allocator() const _GLIBCXX_NOEXCEPT
{ return _M_impl; }
- _List_base()
- : _M_impl()
- { _M_init(); }
+#if __cplusplus >= 201103L
+ _List_base() = default;
+#else
+ _List_base() { }
+#endif
_List_base(const _Node_alloc_type& __a) _GLIBCXX_NOEXCEPT
: _M_impl(__a)
- { _M_init(); }
+ { }
#if __cplusplus >= 201103L
- _List_base(_List_base&& __x) noexcept
- : _M_impl(std::move(__x._M_get_Node_allocator()))
- { _M_move_nodes(std::move(__x)); }
+ _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
- _M_init(); // Caller must move individual elements.
+ // 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)
- {
- auto* const __xnode = std::__addressof(__x._M_impl._M_node);
- if (__xnode->_M_next == __xnode)
- _M_init();
- else
- {
- auto* const __node = std::__addressof(_M_impl._M_node);
- __node->_M_next = __xnode->_M_next;
- __node->_M_prev = __xnode->_M_prev;
- __node->_M_next->_M_prev = __node->_M_prev->_M_next = __node;
- _M_set_size(__x._M_get_size());
- __x._M_init();
- }
- }
+ { _M_impl._M_node._M_move_nodes(std::move(__x._M_impl._M_node)); }
#endif
// This is what actually destroys the list.
void
_M_init() _GLIBCXX_NOEXCEPT
- {
- this->_M_impl._M_node._M_next = &this->_M_impl._M_node;
- this->_M_impl._M_node._M_prev = &this->_M_impl._M_node;
- _M_set_size(0);
- }
+ { this->_M_impl._M_node._M_init(); }
};
/**
* 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.
+ * %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;
+ 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
- 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;
+#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 _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;
+ 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
}
#else
template<typename... _Args>
- _Node*
- _M_create_node(_Args&&... __args)
+ _Node*
+ _M_create_node(_Args&&... __args)
{
auto __p = this->_M_get_node();
auto& __alloc = _M_get_Node_allocator();
}
#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.
*/
- list()
#if __cplusplus >= 201103L
- noexcept(is_nothrow_default_constructible<_Node_alloc_type>::value)
+ list() = default;
+#else
+ list() { }
#endif
- : _Base() { }
/**
* @brief Creates a %list with no elements.
* @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.
+ * by @a __x (unless the allocator traits dictate a different object).
*/
list(const list& __x)
: _Base(_Node_alloc_traits::
#if __cplusplus >= 201103L
/**
* @brief %List move constructor.
- * @param __x A %list of identical element and allocator types.
*
- * The newly-created %list contains the exact contents of @a __x.
- * The contents of @a __x are a valid, but unspecified %list.
+ * 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&& __x) noexcept
- : _Base(std::move(__x)) { }
+ list(list&&) = default;
/**
* @brief Builds a %list from an initializer_list
* initializer_list @a __l. This is linear in __l.size().
*/
list(initializer_list<value_type> __l,
- const allocator_type& __a = allocator_type())
+ 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 allocator_type& __a)
+ 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()); }
- list(list&& __x, const allocator_type& __a)
- noexcept(_Node_alloc_traits::_S_always_equal())
- : _Base(std::move(__x), _Node_alloc_type(__a))
+ 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 is not empty it means its allocator is not equal to __a,
- // so we need to move from each element individually.
- insert(begin(), std::__make_move_if_noexcept_iterator(__x.begin()),
- std::__make_move_if_noexcept_iterator(__x.end()));
+ 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
/**
#if __cplusplus >= 201103L
template<typename _InputIterator,
typename = std::_RequireInputIter<_InputIterator>>
- list(_InputIterator __first, _InputIterator __last,
+ list(_InputIterator __first, _InputIterator __last,
const allocator_type& __a = allocator_type())
: _Base(_Node_alloc_type(__a))
- { _M_initialize_dispatch(__first, __last, __false_type()); }
+ { _M_initialize_dispatch(__first, __last, __false_type()); }
#else
template<typename _InputIterator>
- list(_InputIterator __first, _InputIterator __last,
+ 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
* 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, but unlike the copy
- * constructor, the allocator object is not copied.
+ * All the elements of @a __x are copied.
+ *
+ * Whether the allocator is copied depends on the allocator traits.
*/
list&
operator=(const list& __x);
* @param __x A %list of identical element and allocator types.
*
* The contents of @a __x are moved into this %list (without copying).
- * @a __x is a valid, but unspecified %list
+ *
+ * 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>());
+ _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;
}
* 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. Old data may be lost.
+ * of elements assigned.
*/
void
assign(size_type __n, const value_type& __val)
*
* Note that the assignment completely changes the %list and
* that the resulting %list's size is the same as the number of
- * elements assigned. Old data may be lost.
+ * 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()); }
+ void
+ assign(_InputIterator __first, _InputIterator __last)
+ { _M_assign_dispatch(__first, __last, __false_type()); }
#else
template<typename _InputIterator>
- void
- assign(_InputIterator __first, _InputIterator __last)
- {
+ 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());
*/
void
assign(initializer_list<value_type> __l)
- { this->assign(__l.begin(), __l.end()); }
+ { this->_M_assign_dispatch(__l.begin(), __l.end(), __false_type()); }
#endif
/// Get a copy of the memory allocation object.
* 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); }
* 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); }
* element in the %list. Iteration is done in ordinary element
* order.
*/
+ _GLIBCXX_NODISCARD
iterator
end() _GLIBCXX_NOEXCEPT
{ return iterator(&this->_M_impl._M_node); }
* 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); }
* element in the %list. Iteration is done in reverse element
* order.
*/
+ _GLIBCXX_NODISCARD
reverse_iterator
rbegin() _GLIBCXX_NOEXCEPT
{ return reverse_iterator(end()); }
* 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()); }
* 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()); }
* 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()); }
* 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); }
* 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); }
* 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()); }
* 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()); }
* Returns true if the %list is empty. (Thus begin() would equal
* end().)
*/
- bool
+ _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 this->_M_node_count(); }
+ { 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()); }
* 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;
{ this->_M_insert(begin(), std::move(__x)); }
template<typename... _Args>
- void
- emplace_front(_Args&&... __args)
- { this->_M_insert(begin(), std::forward<_Args>(__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
/**
{ this->_M_insert(end(), std::move(__x)); }
template<typename... _Args>
- void
- emplace_back(_Args&&... __args)
- { this->_M_insert(end(), std::forward<_Args>(__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
/**
* and references.
*/
template<typename... _Args>
- iterator
- emplace(const_iterator __position, _Args&&... __args);
+ iterator
+ emplace(const_iterator __position, _Args&&... __args);
/**
* @brief Inserts given value into %list before specified iterator.
* 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)); }
* does not invalidate iterators and references.
*/
template<typename _InputIterator>
- void
- insert(iterator __position, _InputIterator __first,
+ void
+ insert(iterator __position, _InputIterator __first,
_InputIterator __last)
- {
+ {
list __tmp(__first, __last, get_allocator());
splice(__position, __tmp);
}
* 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)
-#if __cplusplus >= 201103L
- noexcept(_Node_alloc_traits::_S_nothrow_swap())
-#endif
+ swap(list& __x) _GLIBCXX_NOEXCEPT
{
__detail::_List_node_base::swap(this->_M_impl._M_node,
- __x._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());
+ __x._M_get_Node_allocator());
}
/**
void
clear() _GLIBCXX_NOEXCEPT
{
- _Base::_M_clear();
- _Base::_M_init();
+ _Base::_M_clear();
+ _Base::_M_init();
}
// [23.2.2.4] list operations
if (this != std::__addressof(__x))
_M_check_equal_allocators(__x);
- size_t __n = this->_M_distance(__first._M_node, __last._M_node);
+ size_t __n = _S_distance(__first, __last);
this->_M_inc_size(__n);
__x._M_dec_size(__n);
{ splice(__position, std::move(__x), __first, __last); }
#endif
+ private:
+#ifdef __glibcxx_list_remove_return_type // C++ >= 20 && HOSTED
+ 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.
* touched in any way. Managing the pointer is the user's
* responsibility.
*/
- void
+ _GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG
+ __remove_return_type
remove(const _Tp& __value);
/**
* responsibility.
*/
template<typename _Predicate>
- void
- remove_if(_Predicate);
+ __remove_return_type
+ remove_if(_Predicate);
/**
* @brief Remove consecutive duplicate elements.
* the pointed-to memory is not touched in any way. Managing
* the pointer is the user's responsibility.
*/
- void
+ _GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG
+ __remove_return_type
unique();
/**
* Managing the pointer is the user's responsibility.
*/
template<typename _BinaryPredicate>
- void
- unique(_BinaryPredicate);
+ __remove_return_type
+ unique(_BinaryPredicate);
+
+#undef _GLIBCXX_LIST_REMOVE_RETURN_TYPE_TAG
/**
* @brief Merge sorted lists.
*/
#if __cplusplus >= 201103L
template<typename _StrictWeakOrdering>
- void
- merge(list&& __x, _StrictWeakOrdering __comp);
+ void
+ merge(list&& __x, _StrictWeakOrdering __comp);
template<typename _StrictWeakOrdering>
- void
- merge(list& __x, _StrictWeakOrdering __comp)
- { merge(std::move(__x), __comp); }
+ void
+ merge(list& __x, _StrictWeakOrdering __comp)
+ { merge(std::move(__x), __comp); }
#else
template<typename _StrictWeakOrdering>
- void
- merge(list& __x, _StrictWeakOrdering __comp);
+ void
+ merge(list& __x, _StrictWeakOrdering __comp);
#endif
/**
* elements remain in list order.
*/
template<typename _StrictWeakOrdering>
- void
- sort(_StrictWeakOrdering);
+ void
+ sort(_StrictWeakOrdering);
protected:
// Internal constructor functions follow.
// _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); }
+ 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,
+ void
+ _M_initialize_dispatch(_InputIterator __first, _InputIterator __last,
__false_type)
- {
+ {
for (; __first != __last; ++__first)
#if __cplusplus >= 201103L
emplace_back(*__first);
// _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); }
+ 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,
+ void
+ _M_assign_dispatch(_InputIterator __first, _InputIterator __last,
__false_type);
// Called by assign(n,t), and the range assign when it turns out
void
_M_insert(iterator __position, const value_type& __x)
{
- _Node* __tmp = _M_create_node(__x);
- __tmp->_M_hook(__position._M_node);
+ _Node* __tmp = _M_create_node(__x);
+ __tmp->_M_hook(__position._M_node);
this->_M_inc_size(1);
}
#else
_M_erase(iterator __position) _GLIBCXX_NOEXCEPT
{
this->_M_dec_size(1);
- __position._M_node->_M_unhook();
- _Node* __n = static_cast<_Node*>(__position._M_node);
+ __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);
+ _M_put_node(__n);
}
// To implement the splice (and merge) bits of N1599.
void
- _M_check_equal_allocators(list& __x) _GLIBCXX_NOEXCEPT
+ _M_check_equal_allocators(const 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()))
+ if (_M_get_Node_allocator() != __x._M_get_Node_allocator())
__builtin_abort();
}
void
_M_move_assign(list&& __x, true_type) noexcept
{
- this->_M_clear();
- if (__x.empty())
- this->_M_init();
- else
- {
- this->_M_impl._M_node._M_next = __x._M_impl._M_node._M_next;
- this->_M_impl._M_node._M_next->_M_prev = &this->_M_impl._M_node;
- this->_M_impl._M_node._M_prev = __x._M_impl._M_node._M_prev;
- this->_M_impl._M_node._M_prev->_M_next = &this->_M_impl._M_node;
- this->_M_set_size(__x._M_get_size());
- __x._M_init();
- }
- std::__alloc_on_move(this->_M_get_Node_allocator(),
- __x._M_get_Node_allocator());
+ 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
+ _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_if_noexcept_iterator(__x.begin()),
- std::__make_move_if_noexcept_iterator(__x.end()),
+ _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
/**
* 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)
{
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.
* 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(),
/// 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)
-#if __cplusplus >= 201103L
- noexcept(noexcept(__x.swap(__y)))
-#endif
+ _GLIBCXX_NOEXCEPT_IF(noexcept(__x.swap(__y)))
{ __x.swap(__y); }
_GLIBCXX_END_NAMESPACE_CONTAINER
#if _GLIBCXX_USE_CXX11_ABI
-_GLIBCXX_BEGIN_NAMESPACE_VERSION
// Detect when distance is used to compute the size of the whole list.
template<typename _Tp>
_GLIBCXX_STD_C::_List_const_iterator<_Tp> __last,
input_iterator_tag)
{
- typedef _GLIBCXX_STD_C::_List_node<size_t> _Sentinel;
+ typedef __detail::_List_node_header _Sentinel;
_GLIBCXX_STD_C::_List_const_iterator<_Tp> __beyond = __last;
++__beyond;
- bool __whole = __first == __beyond;
+ const bool __whole = __first == __beyond;
if (__builtin_constant_p (__whole) && __whole)
- return *static_cast<const _Sentinel*>(__last._M_node)->_M_valptr();
+ return static_cast<const _Sentinel*>(__last._M_node)->_M_size;
ptrdiff_t __n = 0;
while (__first != __last)
}
return __n;
}
+#endif
_GLIBCXX_END_NAMESPACE_VERSION
-#endif
} // namespace std
#endif /* _STL_LIST_H */
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