C++ 链栈 基本算法实现

#ifndef LinkStack_h
#define LinkStack_h
#include <iostream>
template <class T>
struct Node{
    T data;
    struct Node <T> * next;
};
template <class T>
class LinkStack{
public:
    LinkStack() {top = NULL;}
    ~LinkStack();
    void Push (T x);
    T Pop();
    T GetTop();
    bool Empty() { return (NULL == top)? true:false;}
private:
    struct Node <T> *top;
};
template <class T>
void LinkStack<T>::Push (T x){
    struct Node <T> * p = new Node <T>;
    p->data = x;
    p->next = top;
    top = p;
}
template <class T>
T LinkStack<T> :: Pop(){
    if(Empty()) throw "下溢";
    T x = top->data;
    struct Node <T> * p = top;
    top = top->next;
    delete p;
    return x;
}
template <class T>
LinkStack<T>::~LinkStack(){
    while(top){
        struct Node <T> *p = top;
        top = top-> next;
        delete p;
    }
}
template <class T>
T LinkStack<T>::GetTop(){
    if(Empty()) throw "溢出";
    return top->data;
}
#endif /* LinkStack_h */