链栈封装 C++
使用C++对链栈进行了简单的封装,实现了栈的基本操作
封装方法: pop(),top(),size(),empty(),push()
代码已经过测试
#pragma once
#include <iostream>
#include <algorithm>
using namespace std;
template<class T>class LinkNode{
public:
T data;
LinkNode *pnext;
LinkNode *ppre;
};
template<class T>class Stack {
public:
Stack(); //构造函数
void pop(); //弹出头元素
void push(T value); //入栈
bool empty(); //判断是否为空栈
int size(); //返回栈的大小
T top(); //获取首元素
private:
LinkNode<T> *head;
LinkNode<T> *tail;
int len;
};
template<class T>
inline Stack<T>::Stack()
{
this->head = nullptr;
this->tail = nullptr;
this->len = 0;
}
template<class T>
inline void Stack<T>::pop()
{
if (this->head == this->tail)
{
this->head = this->tail = nullptr;
this->len = 0;
return;
}
LinkNode<T> *p = this->tail;
this->tail = p->ppre;
this->tail->pnext = nullptr;
free(p);
p = nullptr;
this->len--;
}
template<class T>
inline void Stack<T>::push(T value)
{
LinkNode<T> *newnode = new LinkNode<T>;
newnode->data = value;
if (this->len == 0)
{
this->head = newnode;
this->tail = newnode;
this->len++;
}
else {
tail->pnext = newnode;
newnode->ppre = tail;
this->tail = newnode;
this->len++;
}
}
template<class T>
inline bool Stack<T>::empty()
{
if (this->len == 0)
return true;
else return false;
}
template<class T>
inline int Stack<T>::size()
{
return this->len;
}
template<class T>
inline T Stack<T>::top()
{
return T(this->tail->data);
}
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