[pclasses-cvs] pclasses2/include/pclasses Signal.h,NONE,1.1

[Christian P. <cp...@us...>]

Update of /cvsroot/pclasses/pclasses2/include/pclasses
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv32377/include/pclasses

Added Files:
	Signal.h 
Log Message:
Added beginning of Signals 

--- NEW FILE: Signal.h ---
/***************************************************************************
 *   Copyright (C) 2004 by Christian Prochnow                              *
 *   cp...@se...                                                   *
 *                                                                         *
 *   This program 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 program 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this program; if not, write to the                 *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

#ifndef P_Signal_h
#define P_Signal_h

#include <pclasses/Callback.h>
#include <list>

namespace P {

template <class ListType, class CallbackType>
void bind_slot(ListType& list, CallbackType cb)
{
	list.push_back(new CallbackType(cb));
}

template <class ListType, class CallbackType>
void unbind_slot(ListType& list, CallbackType cb)
{
	typename ListType::iterator i = list.begin();
	while(i != list.end())
	{
		if(*i == cb)
		{
			delete *i;
			list.erase(i);
			break;
		}
		++i;
	}
}

template <class ListType>
void unbind_slots(ListType& list)
{
	typename ListType::iterator i = list.begin();
	while(i != list.end())
	{
		delete *i;
		i = list.erase(i);
	}
}

/* -------------------- Signal0 ---------------- */

template <class RetType>
class SignalBase0 {
	public:
		typedef std::list<
			Callback0<RetType>*
		> CallbackList;

		SignalBase0() 
		{ }

		virtual ~SignalBase0()
		{ unbind_slots(_slots); }

		template <class CallbackType>
		void bind(CallbackType slot)
		{ bind_slot(_slots, slot); }

		template <class CallbackType>
		void unbind(CallbackType slot)
		{ unbind_slot(_slots, slot); }

		virtual RetType exec() const = 0;

	protected:
		CallbackList _slots;
};

template <class RetType>
class Signal0: public SignalBase0<RetType> {
	public:
		RetType exec() const
		{
			RetType ret = RetType();
			typename CallbackList::const_iterator i = _slots.begin();
			while(i != _slots.end())
			{
				ret = (*i)->exec();
				if(!ret)
					break;
				++i;
			}
		
			return ret;
		}
};

template <>
class Signal0<void>: public SignalBase0<void> {
	public:
		void exec() const
		{
			CallbackList::const_iterator i = _slots.begin();
			while(i != _slots.end())
			{
				(*i)->exec();
				++i;
			}
		}
};


} // !namespace P

#endif