tstacktest.cpp

来自「thingking in c++（C++编程思想） 各章节课后练习的答案」· C++ 代码 · 共 40 行

//: C16:TStackTest.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
//{T} TStackTest.cpp
#include "TStack.h"
#include "../require.h"
#include <fstream>
#include <iostream>
#include <string>
using namespace std;

class X {
public:
  virtual ~X() { cout << "~X " << endl; }
};

int main(int argc, char* argv[]) {
  requireArgs(argc, 1); // File name is argument
  ifstream in(argv[1]);
  assure(in, argv[1]);
  Stack<string> textlines;
  string line;
  // Read file and store lines in the Stack:
  while(getline(in, line))
    textlines.push(new string(line));
  // Pop some lines from the stack:
  string* s;
  for(int i = 0; i < 10; i++) {
    if((s = (string*)textlines.pop())==0) break;
    cout << *s << endl;
    delete s; 
  } // The destructor deletes the other strings.
  // Show that correct destruction happens:
  Stack<X> xx;
  for(int j = 0; j < 10; j++)
    xx.push(new X);
} ///:~