Callback.h

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/*
 * Callback.h
 *
 * Smalltalk like class library for C++
 * Abstract callback method wrapper. Header.
 *
 * Copyright (c) 2005 Milan Cermak
 */
/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifndef __CALLBACK_H
#define __CALLBACK_H

#include <stlib/Object.h>

namespace Core {

template <typename ReturnT>
class Callback : public Object
{
  public:
    /* Accessing protocol */
    virtual int argumentsNumber(void) abstract;

    /* Processing protocol */
    virtual ReturnT execute(void)
    {
        shouldNotImplement(__PRETTY_FUNCTION__);
        return nil;
    }

    virtual ReturnT executeWith(Object *)
    {
        return execute();
    }
};

template <>
class Callback <void> : public Object
{
  public:
    /* Accessing protocol */
    virtual int argumentsNumber(void) abstract;

    /* Processing protocol */
    virtual void execute(void)
    {
        shouldNotImplement(__PRETTY_FUNCTION__);
    }

    virtual void executeWith(Object *)
    {
        execute();
    }
};

}; /* namespace Core */

#endif /* __CALLBACK_H */

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