memfun1.cpp

Think in C++ 第二版源码

//: C21:MemFun1.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Applying pointers to member functions
#include "../purge.h"
#include <algorithm>
#include <vector>
#include <iostream>
#include <functional>
using namespace std;

class Shape {
public:
  virtual void draw() = 0;
  virtual ~Shape() {}
};

class Circle : public Shape {
public:
  virtual void draw() {
    cout << "Circle::Draw()" << endl;
  }
  ~Circle() {
    cout << "Circle::~Circle()" << endl;
  }
};

class Square : public Shape {
public:
  virtual void draw() {
    cout << "Square::Draw()" << endl;
  }
  ~Square() {
    cout << "Square::~Square()" << endl;
  }
};

int main() {
  vector<Shape*> vs;
  vs.push_back(new Circle);
  vs.push_back(new Square);
  for_each(vs.begin(), vs.end(), 
    mem_fun(&Shape::draw));
  purge(vs);
} ///:~