observer.h

来自「很经典的书籍」· C头文件 代码 · 共 17 行

//: C10:Observer.h
// The Observer interface
#ifndef OBSERVER_H
#define OBSERVER_H

class Observable;
class Argument {};

class Observer {
public:
  // Called by the observed object, whenever
  // the observed object is changed:
  virtual void
  update(Observable* o, Argument * arg) = 0;
};
#endif // OBSERVER_H ///:~