Listener.h

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// -*- C++ -*-
#ifndef Listener_h
#define Listener_h


class ListenerBase
{
public:
  virtual ~ListenerBase(){}
  
  virtual void invoke() = 0;
};

template <class ListenerClass,
          class CallbackFunc = void (ListenerClass::*)()>
class ListenerObject
  : public ListenerBase
{
public:
  ListenerObject(ListenerClass* obj, CallbackFunc cbf)
    : m_obj(obj), m_cbf(cbf)
  {
  }
  
  virtual ~ListenerObject()
  {
  }
  
  virtual void invoke()
  {
    (m_obj->*m_cbf)();
  }
  
private:
  ListenerClass* m_obj;
  CallbackFunc m_cbf;
};

typedef void (*CallbackFunc)();
class ListenerFunc
  : public ListenerBase
{
public:
  ListenerFunc(CallbackFunc cbf)
    : m_cbf(cbf)
  {
  }
  
  virtual ~ListenerFunc(){}
  
  virtual void invoke()
  {
    (*m_cbf)();
  }
  
private:
  CallbackFunc m_cbf;
};

#endif // Listener_h