EventHandler.h++

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/* ---------------------------------------------------------------------------
   commonc++ - A C++ Common Class Library
   Copyright (C) 2005-2014  Mark A Lindner

   This file is part of commonc++.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   ---------------------------------------------------------------------------
*/

#ifndef __ccxx_EventHandler_hxx
#define __ccxx_EventHandler_hxx

#include <commonc++/Common.h++>

namespace ccxx {

template<class E> class EventHandler
{
 public:

  virtual ~EventHandler() { }

  inline void operator() (E event)
  { invoke(event); }

 protected:

  virtual void invoke(E event) = 0;
};

template<class T, class E> class EventHandlerDelegate
  : public EventHandler<E>
{
 public:

  EventHandlerDelegate(T* object, void (T::* func)(E))
    : _object(object), _func(func)
  {
  }

 protected:

  inline void invoke(E event)
  { (_object->*_func)(event); }

 private:

  T* _object;
  void (T::*_func)(E);
};

} // namespace ccxx

#endif // __ccxx_EventHandler_hxx