C++STL源码学习（之slist篇）
来源：互联网 发布：山西大学大数据学院 编辑：程序博客网 时间：2024/06/05 03:30
///stl_slist.h
///list为双向循环链表,slist为单向链表，某些操作效率更高
///slist是SGI额外提供的单向链表,不属于C++标准struct _Slist_node_base{ _Slist_node_base* _M_next;};///将__new_node链在__prev_node后面inline _Slist_node_base*__slist_make_link(_Slist_node_base* __prev_node, _Slist_node_base* __new_node){ __new_node->_M_next = __prev_node->_M_next; __prev_node->_M_next = __new_node; return __new_node;}///查找__node的前一个结点inline _Slist_node_base*__slist_previous(_Slist_node_base* __head, const _Slist_node_base* __node){ while (__head && __head->_M_next != __node) __head = __head->_M_next; return __head;}inline const _Slist_node_base*__slist_previous(const _Slist_node_base* __head, const _Slist_node_base* __node){ while (__head && __head->_M_next != __node) __head = __head->_M_next; return __head;}///将(__before_first,__before_last]从原位置摘下来,插入到__pos之后inline void __slist_splice_after(_Slist_node_base* __pos, _Slist_node_base* __before_first, _Slist_node_base* __before_last){ if (__pos != __before_first && __pos != __before_last) { _Slist_node_base* __first = __before_first->_M_next; _Slist_node_base* __after = __pos->_M_next; __before_first->_M_next = __before_last->_M_next; __pos->_M_next = __first; __before_last->_M_next = __after; }}///将(__head,0)从原位置摘下来,插入__pos之后+inline void__slist_splice_after(_Slist_node_base* __pos, _Slist_node_base* __head){ _Slist_node_base* __before_last = __slist_previous(__head, 0);- if (__before_last != __head) { _Slist_node_base* __after = __pos->_M_next; __pos->_M_next = __head->_M_next; __head->_M_next = 0; __before_last->_M_next = __after; }}///从node开始,将整个链表翻转inline _Slist_node_base* __slist_reverse(_Slist_node_base* __node){ _Slist_node_base* __result = __node; __node = __node->_M_next; __result->_M_next = 0; while(__node) { _Slist_node_base* __next = __node->_M_next; __node->_M_next = __result; ///将_M_next指向其前一个结点 __result = __node; __node = __next; } return __result;}///计算[__node,0)的节点数inline size_t __slist_size(_Slist_node_base* __node){ size_t __result = 0; for ( ; __node != 0; __node = __node->_M_next) ++__result; return __result;}template <class _Tp>struct _Slist_node : public _Slist_node_base{ _Tp _M_data;};struct _Slist_iterator_base{ typedef size_t size_type; typedef ptrdiff_t difference_type; typedef forward_iterator_tag iterator_category; ///前向迭代器 _Slist_node_base* _M_node; _Slist_iterator_base(_Slist_node_base* __x) : _M_node(__x) {} void _M_incr() { _M_node = _M_node->_M_next; } bool operator==(const _Slist_iterator_base& __x) const { return _M_node == __x._M_node; } bool operator!=(const _Slist_iterator_base& __x) const { return _M_node != __x._M_node; }};template <class _Tp, class _Ref, class _Ptr>struct _Slist_iterator : public _Slist_iterator_base{ typedef _Slist_iterator<_Tp, _Tp&, _Tp*> iterator; typedef _Slist_iterator<_Tp, const _Tp&, const _Tp*> const_iterator; typedef _Slist_iterator<_Tp, _Ref, _Ptr> _Self; typedef _Tp value_type; typedef _Ptr pointer; typedef _Ref reference; typedef _Slist_node<_Tp> _Node; _Slist_iterator(_Node* __x) : _Slist_iterator_base(__x) {} _Slist_iterator() : _Slist_iterator_base(0) {} _Slist_iterator(const iterator& __x) : _Slist_iterator_base(__x._M_node) {} reference operator*() const { return ((_Node*) _M_node)->_M_data; } pointer operator->() const { return &(operator*()); } _Self& operator++() { _M_incr(); return *this; } _Self operator++(int) { _Self __tmp = *this; _M_incr(); return __tmp; }};inline ptrdiff_t* distance_type(const _Slist_iterator_base&) { return 0;}inline forward_iterator_tag iterator_category(const _Slist_iterator_base&) { return forward_iterator_tag();}template <class _Tp, class _Ref, class _Ptr>inline _Tp* value_type(const _Slist_iterator<_Tp, _Ref, _Ptr>&) { return 0;}template <class _Tp, class _Alloc>struct _Slist_base { typedef _Alloc allocator_type; allocator_type get_allocator() const { return allocator_type(); } _Slist_base(const allocator_type&) { _M_head._M_next = 0; } ~_Slist_base() { _M_erase_after(&_M_head, 0); } ///清空链表protected: typedef simple_alloc<_Slist_node<_Tp>, _Alloc> _Alloc_type; _Slist_node<_Tp>* _M_get_node() { return _Alloc_type::allocate(1); } void _M_put_node(_Slist_node<_Tp>* __p) { _Alloc_type::deallocate(__p, 1); } ///删除__pos->_M_next _Slist_node_base* _M_erase_after(_Slist_node_base* __pos) { _Slist_node<_Tp>* __next = (_Slist_node<_Tp>*) (__pos->_M_next); _Slist_node_base* __next_next = __next->_M_next; __pos->_M_next = __next_next; destroy(&__next->_M_data); _M_put_node(__next); return __next_next; } _Slist_node_base* _M_erase_after(_Slist_node_base*, _Slist_node_base*);protected: _Slist_node_base _M_head; ///不存储任何数据元素的头结点};///删除(__before_first,__last_node)template <class _Tp, class _Alloc>_Slist_node_base*_Slist_base<_Tp,_Alloc>::_M_erase_after(_Slist_node_base* __before_first, _Slist_node_base* __last_node) { _Slist_node<_Tp>* __cur = (_Slist_node<_Tp>*) (__before_first->_M_next); while (__cur != __last_node) { _Slist_node<_Tp>* __tmp = __cur; __cur = (_Slist_node<_Tp>*) __cur->_M_next; destroy(&__tmp->_M_data); _M_put_node(__tmp); } __before_first->_M_next = __last_node; return __last_node;}template <class _Tp, class _Alloc = Stl_Default_Alloc>class slist : private _Slist_base<_Tp,_Alloc>{ __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; ///构造一个数据元素为x的结点 _Node* _M_create_node(const value_type& __x) { _Node* __node = this->_M_get_node(); try { construct(&__node->_M_data, __x); __node->_M_next = 0; }catch(...){ this->_M_put_node(__node); } return __node; } _Node* _M_create_node() { _Node* __node = this->_M_get_node(); try { construct(&__node->_M_data); __node->_M_next = 0; }catch(...){ 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()); } /// 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); } 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() {} ///善后留给基类析构函数public: void assign(size_type __n, const _Tp& __val) { _M_fill_assign(__n, __val); } void _M_fill_assign(size_type __n, const _Tp& __val); 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);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; } ///交换指针完成 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())); } ///在__pos之后插入__n个数据值为__x的结点 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)); } /// 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);} ///在__pos之后插入[__first,__last)之间的值 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; }}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); } /// 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); } ///由于slist是单向链表,因此多采用insert_after来实现插入 ///提供的insert函数也实现找到插入位置的前驱结点,然后调用insert_after来实现的 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); } /// 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); }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)); } ///由于slist是单向链表,因此多采用erase_after来实现删除 ///提供的erase函数也实现找到删除位置的前驱结点,然后调用erase_after来实现的 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, __before_last ] 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(); 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);};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; ///赋值过程中记录前一个节点指针,方便后面的处理 __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);}template <class _Tp, class _Alloc> template <class _InputIter>voidslist<_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);}template <class _Tp, class _Alloc>inline booloperator==(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 booloperator<(const slist<_Tp,_Alloc>& _SL1, const slist<_Tp,_Alloc>& _SL2){ return lexicographical_compare(_SL1.begin(), _SL1.end(), _SL2.begin(), _SL2.end());}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) ///比较下一个结点的值和val是否相等 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; }}///和list采用相同的算法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]); }}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]); }} 0 0
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