/usr/include/CLAM/Signal.hxx is in libclam-dev 1.4.0-5.2.
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* Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
* UNIVERSITAT POMPEU FABRA
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU 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 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 __SIGNAL__
#define __SIGNAL__
#include <utility>
#include <map>
#include <stack>
namespace SigSlot
{
class Connection;
/** \class Signal
* \brief Abstract 'Event Dispatcher'
*
* Sometimes, is very useful that when an object is subject of a certain message,
* or state change, must notify this change to a number of listeners. This situation,
* albeit it can be modeled quite neatly in OOP suffers a major drawback: coupling. Coupling
* tipically risks the possibility of reusing a certain object due to the fact that the caller
* must know to some extent the callee interface.
*
* However there exist some solutions to this known problem. One of them is the 'Signal and Slot'
* idiom, which features an extremely low coupling between callers and callees. For more details,
* take a look on the CLAM Signal & Slot Library.
*
* This class is an abstract one, already implementing common behaviour, the signal
* and slot connection handling issues.
*/
class Signal
{
public:
typedef std::stack< unsigned > tConnectionIdStack;
typedef unsigned tConnectionId;
/** \brief Destructor
*
* Class destructor
*/
virtual ~Signal();
/** \brief Removes a connection
*
* Removes the given connections, so the Signal does not
* notify anymore the Slot behind that Connection.
* \param conn The connection to be freed
*/
virtual void FreeConnection( Connection* conn ) = 0;
protected:
void FreeConnectionId( tConnectionId );
tConnectionId AssignConnection();
protected:
static tConnectionId smLastConnectionId;
};
}
#endif // Signal.hxx
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