C++ forwardlist学习
C++11中新增了forward_list,头文件是
<forward_list>这个container是一个单向链表,在sgi stl中对应的是slist
数据结构中数据项保存的是头节点,尾节点初始化为0,表示链表的end()。
template <class _Tp, class _Alloc = __STL_DEFAULT_ALLOCATOR(_Tp) > class slist : private _Slist_base<_Tp,_Alloc> { // requirements: __STL_CLASS_REQUIRES(_Tp, _Assignable); private: typedef _Slist_base<_Tp,_Alloc> _Base; public: typedef _Tp value_type; typedef value_type* pointer; typedef const value_type* const_pointer; typedef value_type& reference; typedef const value_type& const_reference; typedef size_t size_type; typedef ptrdiff_t difference_type; typedef _Slist_iterator<_Tp, _Tp&, _Tp*> iterator; typedef _Slist_iterator<_Tp, const _Tp&, const _Tp*> const_iterator; typedef typename _Base::allocator_type allocator_type; allocator_type get_allocator() const { return _Base::get_allocator(); } private: typedef _Slist_node<_Tp> _Node; typedef _Slist_node_base _Node_base; typedef _Slist_iterator_base _Iterator_base; _Node* _M_create_node(const value_type& __x) { _Node* __node = this->_M_get_node(); __STL_TRY { construct(&__node->_M_data, __x); __node->_M_next = 0; } __STL_UNWIND(this->_M_put_node(__node)); return __node; } _Node* _M_create_node() { _Node* __node = this->_M_get_node(); __STL_TRY { construct(&__node->_M_data); __node->_M_next = 0; } __STL_UNWIND(this->_M_put_node(__node)); return __node; } public: explicit slist(const allocator_type& __a = allocator_type()) : _Base(__a) {} slist(size_type __n, const value_type& __x, const allocator_type& __a = allocator_type()) : _Base(__a) { _M_insert_after_fill(&this->_M_head, __n, __x); } explicit slist(size_type __n) : _Base(allocator_type()) { _M_insert_after_fill(&this->_M_head, __n, value_type()); } #ifdef __STL_MEMBER_TEMPLATES // We don't need any dispatching tricks here, because _M_insert_after_range // already does them. template <class _InputIterator> slist(_InputIterator __first, _InputIterator __last, const allocator_type& __a = allocator_type()) : _Base(__a) { _M_insert_after_range(&this->_M_head, __first, __last); } #else /* __STL_MEMBER_TEMPLATES */ slist(const_iterator __first, const_iterator __last, const allocator_type& __a = allocator_type()) : _Base(__a) { _M_insert_after_range(&this->_M_head, __first, __last); } slist(const value_type* __first, const value_type* __last, const allocator_type& __a = allocator_type()) : _Base(__a) { _M_insert_after_range(&this->_M_head, __first, __last); } #endif /* __STL_MEMBER_TEMPLATES */ slist(const slist& __x) : _Base(__x.get_allocator()) { _M_insert_after_range(&this->_M_head, __x.begin(), __x.end()); } slist& operator= (const slist& __x); ~slist() {} public: // assign(), a generalized assignment member function. Two // versions: one that takes a count, and one that takes a range. // The range version is a member template, so we dispatch on whether // or not the type is an integer. void assign(size_type __n, const _Tp& __val) { _M_fill_assign(__n, __val); } void _M_fill_assign(size_type __n, const _Tp& __val); #ifdef __STL_MEMBER_TEMPLATES template <class _InputIterator> void assign(_InputIterator __first, _InputIterator __last) { typedef typename _Is_integer<_InputIterator>::_Integral _Integral; _M_assign_dispatch(__first, __last, _Integral()); } template <class _Integer> void _M_assign_dispatch(_Integer __n, _Integer __val, __true_type) { _M_fill_assign((size_type) __n, (_Tp) __val); } template <class _InputIterator> void _M_assign_dispatch(_InputIterator __first, _InputIterator __last, __false_type); #endif /* __STL_MEMBER_TEMPLATES */ public: iterator begin() { return iterator((_Node*)this->_M_head._M_next); } const_iterator begin() const { return const_iterator((_Node*)this->_M_head._M_next);} iterator end() { return iterator(0); } const_iterator end() const { return const_iterator(0); } // Experimental new feature: before_begin() returns a // non-dereferenceable iterator that, when incremented, yields // begin(). This iterator may be used as the argument to // insert_after, erase_after, etc. Note that even for an empty // slist, before_begin() is not the same iterator as end(). It // is always necessary to increment before_begin() at least once to // obtain end(). iterator before_begin() { return iterator((_Node*) &this->_M_head); } const_iterator before_begin() const { return const_iterator((_Node*) &this->_M_head); } size_type size() const { return __slist_size(this->_M_head._M_next); } size_type max_size() const { return size_type(-1); } bool empty() const { return this->_M_head._M_next == 0; } void swap(slist& __x) { __STD::swap(this->_M_head._M_next, __x._M_head._M_next); } public: reference front() { return ((_Node*) this->_M_head._M_next)->_M_data; } const_reference front() const { return ((_Node*) this->_M_head._M_next)->_M_data; } void push_front(const value_type& __x) { __slist_make_link(&this->_M_head, _M_create_node(__x)); } void push_front() { __slist_make_link(&this->_M_head, _M_create_node()); } void pop_front() { _Node* __node = (_Node*) this->_M_head._M_next; this->_M_head._M_next = __node->_M_next; destroy(&__node->_M_data); this->_M_put_node(__node); } iterator previous(const_iterator __pos) { return iterator((_Node*) __slist_previous(&this->_M_head, __pos._M_node)); } const_iterator previous(const_iterator __pos) const { return const_iterator((_Node*) __slist_previous(&this->_M_head, __pos._M_node)); } private: _Node* _M_insert_after(_Node_base* __pos, const value_type& __x) { return (_Node*) (__slist_make_link(__pos, _M_create_node(__x))); } _Node* _M_insert_after(_Node_base* __pos) { return (_Node*) (__slist_make_link(__pos, _M_create_node())); } void _M_insert_after_fill(_Node_base* __pos, size_type __n, const value_type& __x) { for (size_type __i = 0; __i < __n; ++__i) __pos = __slist_make_link(__pos, _M_create_node(__x)); } #ifdef __STL_MEMBER_TEMPLATES // Check whether it's an integral type. If so, it's not an iterator. template <class _InIter> void _M_insert_after_range(_Node_base* __pos, _InIter __first, _InIter __last) { typedef typename _Is_integer<_InIter>::_Integral _Integral; _M_insert_after_range(__pos, __first, __last, _Integral()); } template <class _Integer> void _M_insert_after_range(_Node_base* __pos, _Integer __n, _Integer __x, __true_type) { _M_insert_after_fill(__pos, __n, __x); } template <class _InIter> void _M_insert_after_range(_Node_base* __pos, _InIter __first, _InIter __last, __false_type) { while (__first != __last) { __pos = __slist_make_link(__pos, _M_create_node(*__first)); ++__first; } } #else /* __STL_MEMBER_TEMPLATES */ void _M_insert_after_range(_Node_base* __pos, const_iterator __first, const_iterator __last) { while (__first != __last) { __pos = __slist_make_link(__pos, _M_create_node(*__first)); ++__first; } } void _M_insert_after_range(_Node_base* __pos, const value_type* __first, const value_type* __last) { while (__first != __last) { __pos = __slist_make_link(__pos, _M_create_node(*__first)); ++__first; } } #endif /* __STL_MEMBER_TEMPLATES */ public: iterator insert_after(iterator __pos, const value_type& __x) { return iterator(_M_insert_after(__pos._M_node, __x)); } iterator insert_after(iterator __pos) { return insert_after(__pos, value_type()); } void insert_after(iterator __pos, size_type __n, const value_type& __x) { _M_insert_after_fill(__pos._M_node, __n, __x); } #ifdef __STL_MEMBER_TEMPLATES // We don't need any dispatching tricks here, because _M_insert_after_range // already does them. template <class _InIter> void insert_after(iterator __pos, _InIter __first, _InIter __last) { _M_insert_after_range(__pos._M_node, __first, __last); } #else /* __STL_MEMBER_TEMPLATES */ void insert_after(iterator __pos, const_iterator __first, const_iterator __last) { _M_insert_after_range(__pos._M_node, __first, __last); } void insert_after(iterator __pos, const value_type* __first, const value_type* __last) { _M_insert_after_range(__pos._M_node, __first, __last); } #endif /* __STL_MEMBER_TEMPLATES */ iterator insert(iterator __pos, const value_type& __x) { return iterator(_M_insert_after(__slist_previous(&this->_M_head, __pos._M_node), __x)); } iterator insert(iterator __pos) { return iterator(_M_insert_after(__slist_previous(&this->_M_head, __pos._M_node), value_type())); } void insert(iterator __pos, size_type __n, const value_type& __x) { _M_insert_after_fill(__slist_previous(&this->_M_head, __pos._M_node), __n, __x); } #ifdef __STL_MEMBER_TEMPLATES // We don't need any dispatching tricks here, because _M_insert_after_range // already does them. template <class _InIter> void insert(iterator __pos, _InIter __first, _InIter __last) { _M_insert_after_range(__slist_previous(&this->_M_head, __pos._M_node), __first, __last); } #else /* __STL_MEMBER_TEMPLATES */ void insert(iterator __pos, const_iterator __first, const_iterator __last) { _M_insert_after_range(__slist_previous(&this->_M_head, __pos._M_node), __first, __last); } void insert(iterator __pos, const value_type* __first, const value_type* __last) { _M_insert_after_range(__slist_previous(&this->_M_head, __pos._M_node), __first, __last); } #endif /* __STL_MEMBER_TEMPLATES */ public: iterator erase_after(iterator __pos) { return iterator((_Node*) this->_M_erase_after(__pos._M_node)); } iterator erase_after(iterator __before_first, iterator __last) { return iterator((_Node*) this->_M_erase_after(__before_first._M_node, __last._M_node)); } iterator erase(iterator __pos) { return (_Node*) this->_M_erase_after(__slist_previous(&this->_M_head, __pos._M_node)); } iterator erase(iterator __first, iterator __last) { return (_Node*) this->_M_erase_after( __slist_previous(&this->_M_head, __first._M_node), __last._M_node); } void resize(size_type new_size, const _Tp& __x); void resize(size_type new_size) { resize(new_size, _Tp()); } void clear() { this->_M_erase_after(&this->_M_head, 0); } public: // Moves the range [__before_first + 1, __before_last + 1) to *this, // inserting it immediately after __pos. This is constant time. void splice_after(iterator __pos, iterator __before_first, iterator __before_last) { if (__before_first != __before_last) __slist_splice_after(__pos._M_node, __before_first._M_node, __before_last._M_node); } // Moves the element that follows __prev to *this, inserting it immediately // after __pos. This is constant time. void splice_after(iterator __pos, iterator __prev) { __slist_splice_after(__pos._M_node, __prev._M_node, __prev._M_node->_M_next); } // Removes all of the elements from the list __x to *this, inserting // them immediately after __pos. __x must not be *this. Complexity: // linear in __x.size(). void splice_after(iterator __pos, slist& __x) { __slist_splice_after(__pos._M_node, &__x._M_head); } // Linear in distance(begin(), __pos), and linear in __x.size(). void splice(iterator __pos, slist& __x) { if (__x._M_head._M_next) __slist_splice_after(__slist_previous(&this->_M_head, __pos._M_node), &__x._M_head, __slist_previous(&__x._M_head, 0)); } // Linear in distance(begin(), __pos), and in distance(__x.begin(), __i). void splice(iterator __pos, slist& __x, iterator __i) { __slist_splice_after(__slist_previous(&this->_M_head, __pos._M_node), __slist_previous(&__x._M_head, __i._M_node), __i._M_node); } // Linear in distance(begin(), __pos), in distance(__x.begin(), __first), // and in distance(__first, __last). void splice(iterator __pos, slist& __x, iterator __first, iterator __last) { if (__first != __last) __slist_splice_after(__slist_previous(&this->_M_head, __pos._M_node), __slist_previous(&__x._M_head, __first._M_node), __slist_previous(__first._M_node, __last._M_node)); } public: void reverse() { if (this->_M_head._M_next) this->_M_head._M_next = __slist_reverse(this->_M_head._M_next); } void remove(const _Tp& __val); void unique(); void merge(slist& __x); void sort(); #ifdef __STL_MEMBER_TEMPLATES template <class _Predicate> void remove_if(_Predicate __pred); template <class _BinaryPredicate> void unique(_BinaryPredicate __pred); template <class _StrictWeakOrdering> void merge(slist&, _StrictWeakOrdering); template <class _StrictWeakOrdering> void sort(_StrictWeakOrdering __comp); #endif /* __STL_MEMBER_TEMPLATES */ }; template <class _Tp, class _Alloc> slist<_Tp,_Alloc>& slist<_Tp,_Alloc>::operator=(const slist<_Tp,_Alloc>& __x) { if (&__x != this) { _Node_base* __p1 = &this->_M_head; _Node* __n1 = (_Node*) this->_M_head._M_next; const _Node* __n2 = (const _Node*) __x._M_head._M_next; while (__n1 && __n2) { __n1->_M_data = __n2->_M_data; __p1 = __n1; __n1 = (_Node*) __n1->_M_next; __n2 = (const _Node*) __n2->_M_next; } if (__n2 == 0) this->_M_erase_after(__p1, 0); else _M_insert_after_range(__p1, const_iterator((_Node*)__n2), const_iterator(0)); } return *this; } template <class _Tp, class _Alloc> void slist<_Tp, _Alloc>::_M_fill_assign(size_type __n, const _Tp& __val) { _Node_base* __prev = &this->_M_head; _Node* __node = (_Node*) this->_M_head._M_next; for ( ; __node != 0 && __n > 0 ; --__n) { __node->_M_data = __val; __prev = __node; __node = (_Node*) __node->_M_next; } if (__n > 0) _M_insert_after_fill(__prev, __n, __val); else this->_M_erase_after(__prev, 0); } #ifdef __STL_MEMBER_TEMPLATES template <class _Tp, class _Alloc> template <class _InputIter> void slist<_Tp, _Alloc>::_M_assign_dispatch(_InputIter __first, _InputIter __last, __false_type) { _Node_base* __prev = &this->_M_head; _Node* __node = (_Node*) this->_M_head._M_next; while (__node != 0 && __first != __last) { __node->_M_data = *__first; __prev = __node; __node = (_Node*) __node->_M_next; ++__first; } if (__first != __last) _M_insert_after_range(__prev, __first, __last); else this->_M_erase_after(__prev, 0); } #endif /* __STL_MEMBER_TEMPLATES */ template <class _Tp, class _Alloc> inline bool operator==(const slist<_Tp,_Alloc>& _SL1, const slist<_Tp,_Alloc>& _SL2) { typedef typename slist<_Tp,_Alloc>::const_iterator const_iterator; const_iterator __end1 = _SL1.end(); const_iterator __end2 = _SL2.end(); const_iterator __i1 = _SL1.begin(); const_iterator __i2 = _SL2.begin(); while (__i1 != __end1 && __i2 != __end2 && *__i1 == *__i2) { ++__i1; ++__i2; } return __i1 == __end1 && __i2 == __end2; } template <class _Tp, class _Alloc> inline bool operator<(const slist<_Tp,_Alloc>& _SL1, const slist<_Tp,_Alloc>& _SL2) { return lexicographical_compare(_SL1.begin(), _SL1.end(), _SL2.begin(), _SL2.end()); } #ifdef __STL_FUNCTION_TMPL_PARTIAL_ORDER template <class _Tp, class _Alloc> inline bool operator!=(const slist<_Tp,_Alloc>& _SL1, const slist<_Tp,_Alloc>& _SL2) { return !(_SL1 == _SL2); } template <class _Tp, class _Alloc> inline bool operator>(const slist<_Tp,_Alloc>& _SL1, const slist<_Tp,_Alloc>& _SL2) { return _SL2 < _SL1; } template <class _Tp, class _Alloc> inline bool operator<=(const slist<_Tp,_Alloc>& _SL1, const slist<_Tp,_Alloc>& _SL2) { return !(_SL2 < _SL1); } template <class _Tp, class _Alloc> inline bool operator>=(const slist<_Tp,_Alloc>& _SL1, const slist<_Tp,_Alloc>& _SL2) { return !(_SL1 < _SL2); } template <class _Tp, class _Alloc> inline void swap(slist<_Tp,_Alloc>& __x, slist<_Tp,_Alloc>& __y) { __x.swap(__y); } #endif /* __STL_FUNCTION_TMPL_PARTIAL_ORDER */ template <class _Tp, class _Alloc> void slist<_Tp,_Alloc>::resize(size_type __len, const _Tp& __x) { _Node_base* __cur = &this->_M_head; while (__cur->_M_next != 0 && __len > 0) { --__len; __cur = __cur->_M_next; } if (__cur->_M_next) this->_M_erase_after(__cur, 0); else _M_insert_after_fill(__cur, __len, __x); } template <class _Tp, class _Alloc> void slist<_Tp,_Alloc>::remove(const _Tp& __val) { _Node_base* __cur = &this->_M_head; while (__cur && __cur->_M_next) { if (((_Node*) __cur->_M_next)->_M_data == __val) this->_M_erase_after(__cur); else __cur = __cur->_M_next; } } template <class _Tp, class _Alloc> void slist<_Tp,_Alloc>::unique() { _Node_base* __cur = this->_M_head._M_next; if (__cur) { while (__cur->_M_next) { if (((_Node*)__cur)->_M_data == ((_Node*)(__cur->_M_next))->_M_data) this->_M_erase_after(__cur); else __cur = __cur->_M_next; } } } template <class _Tp, class _Alloc> void slist<_Tp,_Alloc>::merge(slist<_Tp,_Alloc>& __x) { _Node_base* __n1 = &this->_M_head; while (__n1->_M_next && __x._M_head._M_next) { if (((_Node*) __x._M_head._M_next)->_M_data < ((_Node*) __n1->_M_next)->_M_data) __slist_splice_after(__n1, &__x._M_head, __x._M_head._M_next); __n1 = __n1->_M_next; } if (__x._M_head._M_next) { __n1->_M_next = __x._M_head._M_next; __x._M_head._M_next = 0; } } template <class _Tp, class _Alloc> void slist<_Tp,_Alloc>::sort() { if (this->_M_head._M_next && this->_M_head._M_next->_M_next) { slist __carry; slist __counter[64]; int __fill = 0; while (!empty()) { __slist_splice_after(&__carry._M_head, &this->_M_head, this->_M_head._M_next); int __i = 0; while (__i < __fill && !__counter[__i].empty()) { __counter[__i].merge(__carry); __carry.swap(__counter[__i]); ++__i; } __carry.swap(__counter[__i]); if (__i == __fill) ++__fill; } for (int __i = 1; __i < __fill; ++__i) __counter[__i].merge(__counter[__i-1]); this->swap(__counter[__fill-1]); } } #ifdef __STL_MEMBER_TEMPLATES template <class _Tp, class _Alloc> template <class _Predicate> void slist<_Tp,_Alloc>::remove_if(_Predicate __pred) { _Node_base* __cur = &this->_M_head; while (__cur->_M_next) { if (__pred(((_Node*) __cur->_M_next)->_M_data)) this->_M_erase_after(__cur); else __cur = __cur->_M_next; } } template <class _Tp, class _Alloc> template <class _BinaryPredicate> void slist<_Tp,_Alloc>::unique(_BinaryPredicate __pred) { _Node* __cur = (_Node*) this->_M_head._M_next; if (__cur) { while (__cur->_M_next) { if (__pred(((_Node*)__cur)->_M_data, ((_Node*)(__cur->_M_next))->_M_data)) this->_M_erase_after(__cur); else __cur = (_Node*) __cur->_M_next; } } } template <class _Tp, class _Alloc> template <class _StrictWeakOrdering> void slist<_Tp,_Alloc>::merge(slist<_Tp,_Alloc>& __x, _StrictWeakOrdering __comp) { _Node_base* __n1 = &this->_M_head; while (__n1->_M_next && __x._M_head._M_next) { if (__comp(((_Node*) __x._M_head._M_next)->_M_data, ((_Node*) __n1->_M_next)->_M_data)) __slist_splice_after(__n1, &__x._M_head, __x._M_head._M_next); __n1 = __n1->_M_next; } if (__x._M_head._M_next) { __n1->_M_next = __x._M_head._M_next; __x._M_head._M_next = 0; } } template <class _Tp, class _Alloc> template <class _StrictWeakOrdering> void slist<_Tp,_Alloc>::sort(_StrictWeakOrdering __comp) { if (this->_M_head._M_next && this->_M_head._M_next->_M_next) { slist __carry; slist __counter[64]; int __fill = 0; while (!empty()) { __slist_splice_after(&__carry._M_head, &this->_M_head, this->_M_head._M_next); int __i = 0; while (__i < __fill && !__counter[__i].empty()) { __counter[__i].merge(__carry, __comp); __carry.swap(__counter[__i]); ++__i; } __carry.swap(__counter[__i]); if (__i == __fill) ++__fill; } for (int __i = 1; __i < __fill; ++__i) __counter[__i].merge(__counter[__i-1], __comp); this->swap(__counter[__fill-1]); } } #endif /* __STL_MEMBER_TEMPLATES */ // Specialization of insert_iterator so that insertions will be constant // time rather than linear time. #ifdef __STL_CLASS_PARTIAL_SPECIALIZATION template <class _Tp, class _Alloc> class insert_iterator<slist<_Tp, _Alloc> > { protected: typedef slist<_Tp, _Alloc> _Container; _Container* container; typename _Container::iterator iter; public: typedef _Container container_type; typedef output_iterator_tag iterator_category; typedef void value_type; typedef void difference_type; typedef void pointer; typedef void reference; insert_iterator(_Container& __x, typename _Container::iterator __i) : container(&__x) { if (__i == __x.begin()) iter = __x.before_begin(); else iter = __x.previous(__i); } insert_iterator<_Container>& operator=(const typename _Container::value_type& __value) { iter = container->insert_after(iter, __value); return *this; } insert_iterator<_Container>& operator*() { return *this; } insert_iterator<_Container>& operator++() { return *this; } insert_iterator<_Container>& operator++(int) { return *this; } };
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特别地,`std::list`、`std::deque`和`std::forward_list`是不同类型的链表,而`std::queue`和`std::stack`则是基于其他容器的抽象数据类型。此外,STL中的算法如`std::transform`和`std::partial_sort`可以增强代码...
C++标准库中的容器是存储和管理对象的集合,包括数组(`std::array`)、向量(`std::vector`)、列表(`std::list`)、链表(`std::forward_list`)、集合(`std::set`)、映射(`std::map`)、无序集合(`std::...
C++内置了array(数组)这一序列容器,而STL提供的其他序列容器包括vector、list、forward_list、deque等。这些容器都是模板类,可存储不同类型的对象,且拥有广泛的接口供程序员使用。stack和queue虽然是容器,但...
- `forward_list` (单向链表) - `array` (固定大小数组) - `set` 和 `multiset` (有序集合) - `map` 和 `multimap` (键值对集合) - `unordered_set` 和 `unordered_map` (哈希表) 这些容器各有特点和适用场景,但...
- 链表:C++标准库中的std::list和std::forward_list。 - 树结构:二叉树、AVL树、红黑树等,通常在STL容器如std::set和std::map中实现。 - 图:虽然C++标准库未直接提供图数据结构,但可以通过自定义结构实现。 ...
其他的头文件比如、、、、、、、、、、、、、、、、、、、、、、、、、<forward_list>、等,每一个都定义了一组类、模板、函数或类型别名,用于不同的编程需求。比如提供固定大小数组的封装,提供对原子操作的支持,...