C++ 模拟实现list(迭代器)
实现代码:
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#pragma once; #include <assert.h> #include<iostream> #include <assert.h> using namespace std; template < class T> struct __ListNode { T _data; __ListNode<T>* _next; __ListNode<T>* _prev; __ListNode( const T& x) :_data(x) ,_next(NULL) ,_prev(NULL) { } }; template < class T, class Ref, class Ptr > struct __ListIterator { typedef __ListNode<T> Node; typedef __ListIterator<T,Ref,Ptr> Self; __ListIterator(Node* node) :_node(node) { } Ref operator*() { return _node->_data; } Ptr operator->() { return &(_node->_data) } Self& operator++() { _node=_node->_next; return * this ; } Self& operator--() { _node=_node->_prev; return * this ; } Self operator++( int ) { Self tmp=_node; _node=_node->_next; //return tmp; return Self(tmp) } Self operator--( int ) { Self tmp=(* this ); _node=_node->_prev; return tmp; } bool operator!=( const Self& s) const { return this ->_node!=s._node; } bool operator==( const Self& s) const { return this ->_node==s._node; } Node* _node; }; template < class T> struct List { typedef __ListNode<T> Node; public : typedef __ListIterator<T,T&,T*> Iterator; typedef __ListIterator<T, const T&, const T*> ConstIterator; Node* GetNode( const T& x) { return new Node(x); } List() { _head=GetNode(T()); _head->_next=_head; _head->_prev=_head; } Iterator Begin() { return Iterator(_head->_next); } Iterator End() { return Iterator(_head); } ConstIterator Begin() const { return ConstIterator(_head->_next); } ConstIterator End() const { return ConstIterator(_head); } void PushBack( const T& x) { /* Node* _tail=_head->_prev; Node* tmp=GetNode(x); _tail->_next=tmp; tmp->_prev=_tail; tmp->_next=_head; _head->_prev=tmp;*/ Insert(End(),x); } void PopBack() { /* assert(_head->_prev ); Node* tail=_head->_prev; Node* prev=tail->_prev; Node* next=tail->_next; prev->_next=next; next->_prev=prev; delete tail;*/ Erase(--End()); } void PushFront( const T& x) { /*assert(_head) Node* tmp=GetNode(x); Node* next=_head->_next; _head->_next=tmp; tmp->_prev=_head; tmp->_next=next; next->_prev=tmp;*/ Insert(Begin(),x); } void PopFront() { /*assert(_head->_next); Node* tmp=_head->_next; Node* next=tmp->_next; _head->_next= next; next->_prev=_head; delete tmp;*/ Erase(Begin()); } Iterator Insert(Iterator pos, const T& x) { assert (pos._node); Node* tmp=GetNode(x); Node* cur=pos._node; Node* prev=cur->_prev; prev->_next=tmp; tmp->_prev=prev; tmp->_next=cur; cur->_prev=tmp; return tmp; } Iterator Erase(Iterator pos) { assert (pos._node && pos._node!=NULL); Node* tmp=pos._node; Node* next=tmp->_next; Node* prev=tmp->_prev; next->_prev=prev; prev->_next=next; delete tmp; return Iterator(next); } protected : Node* _head; }; void PrintList( const List< int >& l) { List< int >::ConstIterator It=l.Begin(); while (It!=l.End()) { cout<<*It<< " " ; ++It; } cout<<endl;} void TestList2() { List< int > l2; l2.PushBack(1); l2.PushBack(2); l2.PushBack(3); l2.PushBack(4); l2.PopBack(); l2.PopBack(); l2.PopBack(); l2.PopBack(); l2.PopBack(); PrintList(l2); } void TestList3() { List< int > l3; l3.PushFront(1); l3.PushFront(2); l3.PushFront(3); l3.PushFront(4); l3.PopFront(); l3.PopFront(); l3.PopFront(); PrintList(l3); } |
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#include "List.h" int main() { //TestList1(); //TestList2(); TestList3(); return 0; } |
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原文链接:http://blog.csdn.net/wangpengcsdn1/article/details/70490639