9:46pm ccbsd3:que4/> g++ testmyq4.cpp
9:46pm ccbsd3:que4/> ./a.out
88077053
9:46pm ccbsd3:que4/> cat -n testmyq4.cpp
     1  // testmyq4.cpp -- copyLeft by tsaiwn@csie.nctu.edu.tw
     2  //  g++ testmyq4.cpp  ; ./a.out
     3  using namespace std;
     4  #include "myq4.h"
     5  //注意以下是 1999之後的 C++ 新寫法, 舊法使用 <iostream.h>
     6  #include<iostream>
     7  int main( ){
     8     MyStack <int> x;    // 注意這!
     9     x.push(880);
    10     x.push(770);
    11     x.push(53);
    12     while(!x.empty()){
    13        cout << x.top();  x.pop();
    14     }
    15     cout << endl;
    16  }
9:46pm ccbsd3:que4/> cat -n myq4.h
     1 //myq4.h  -- queue using vector  (not GOOD)
     2 #ifndef __MYQ4__
     3 #define __MYQ4__
     4 #include <vector>
     5 using namespace std;
     6 template <class T>
     7 class MyStack : vector<T> {   // actually is a queue
     8 public:
     9    void push(const T& y) {
    10       MyStack<T>::push_back(y);
    11    }
    12    T top( ) {
    13       return MyStack<T>::front( ); 
    14       return  vector<T>::front( );  // OK too
    15       //return this -> front( );  // this is also OK
    16    }
    17    void pop( ) {
    18       MyStack<T>::erase( MyStack<T>::begin( ) );
    19    }
    20    bool empty( ) { return MyStack<T>::begin() == MyStack<T>::end(); }
    21 };
    22 #endif
9:46pm ccbsd3:que4/> 
9:46pm ccbsd3:que4/> g++ testmyq4.cpp
9:46pm ccbsd3:que4/> ./a.out
88077053
9:46pm ccbsd3:que4/> exit
exit