ch.8 DoubleBuffer Comedian ex.3

#include <string>
#include <iostream>

class Actor {
public:
  Actor(const char* name) : name_(name) {}
  virtual ~Actor() {}
  virtual void update() = 0;
  void swap() {
    currentSlapped_ = nextSlapped_;
    nextSlapped_ = false;
  }
  void slap() { nextSlapped_ = true; }
  bool wasSlapped() { return currentSlapped_; }
  const std::string& name() const { return name_; }

private:
  bool currentSlapped_ = false;
  bool nextSlapped_ = false;
  std::string name_;
};

class Stage {
public:
  void add(Actor* actor, int index) {
    actors_[index] = actor;
  }
  void update() {
    std::cout << "Stage updates starts\r\n";
    for (int i = 0; i < NUM_ACTORS; ++i) {
      actors_[i]->update();
    }
    for (int i = 0; i < NUM_ACTORS; ++i) {
      actors_[i]->swap();
    }
    std::cout << "Stage updates ends\r\n";
  }

private:
  static const int NUM_ACTORS = 3;
  Actor* actors_[NUM_ACTORS];
};

class Comedian : public Actor {
public:
  Comedian(const char* name) : Actor(name) {}
  void face(Actor* actor) { facing_ = actor; }
  virtual void update() {
    if (wasSlapped()) {
      std::cout << "  " << name() << " was slapped, so he slaps " << facing_->name() << std::endl;
      facing_->slap();
    } else {
      std::cout << "  " << name() << " was not slapped, so he does nothing\r\n";
    }
  }
private:
  Actor* facing_;
};

int _tmain(int argc, _TCHAR* argv[]) {
  Stage stage;
  Comedian* harry = new Comedian("Harry");
  Comedian* baldy = new Comedian("Baldy");
  Comedian* chump = new Comedian("Chump");

  harry->face(baldy);
  baldy->face(chump);
  chump->face(harry);

  stage.add(harry, 2);
  stage.add(baldy, 1);
  stage.add(chump, 0);

  harry->slap();
  stage.update();
  stage.update();
  stage.update();
  stage.update();
  stage.update();
  stage.update();
  stage.update();

  int temp = 0;
  std::cin >> temp;

  return 0;
}