链表栈(LinkedListStack)
链式栈:就是一种操作受限的单向链表,每次入栈一个元素,向链表中添加一个节点,出栈一个元素,释放一个节点。因为栈具有“后进先出”的特点,如果每次在链表的尾部进行插入和删除,就要遍历整个链表来找到尾节点。而在头部进行插入和删除时,只需根据头指针即可找到链表的首元素结点。而无需遍历链表。所以链式栈的出,入栈通过对链表进行头删和头插来实现。
代码是在链表的二次封装,先阅读底层实现更佳LinkedList
代码清单
LinkedListStack.h
#ifndef C___LINKEDLISTSTACK_H
#define C___LINKEDLISTSTACK_H
#include "LinkedList.h"
template<typename T>
class Stack {
public:
virtual int getSize()const = 0;
virtual bool isEmpty()const = 0;
virtual void push(T& e) = 0;
virtual T pop() = 0;
virtual T peek()const = 0;
};
template<typename T>
class LinkedListStack : public Stack<T> {
public:
LinkedListStack();
int getSize()const;
bool isEmpty()const;
void push(T&e);
T pop();
T peek()const;
void print()const;
private:
LinkedList<T>*list;
};
template<typename T>
int LinkedListStack<T>::getSize() const {
return list->getSize();
}
template<typename T>
bool LinkedListStack<T>::isEmpty() const {
return list->isEmpty();
}
template<typename T>
void LinkedListStack<T>::push(T& e) {
list->addFirst(e);
}
template<typename T>
T LinkedListStack<T>::pop() {
return list->removeFirst();
}
template<typename T>
T LinkedListStack<T>::peek()const {
return list->getFirst();
}
template<typename T>
void LinkedListStack<T>::print() const {
std::cout << "Stack: size = " << list->getSize() << std::endl;
std::cout << "bottom ";
list->print();
std::cout << " top" << std::endl;
}
template<typename T>
LinkedListStack<T>::LinkedListStack() {
list = new LinkedList<T>();
}
#endif //C___LINKEDLISTSTACK_H
main.cpp
int LinkedListStack()
{
LinkedListStack<int>*ls = new LinkedListStack<int>();
for(int i = 0;i<10;++i)
{
ls->push(i);
ls->print();
}
cout<<"isEmpty()"<<ls->isEmpty()<<endl;
cout<<"getSize()"<<ls->getSize()<<endl;
cout<<"peek"<<ls->peek()<<endl;
cout<<"pop"<<ls->pop()<<endl;
ls->print();
return 0;
}