mail_stop.h

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#ifndef MAIL_STOP_CLASS
#define MAIL_STOP_CLASS
 
/*****************************************************************************\
*                                                                             *
*  Name   : mail_stop                                                         *
*  Author : Chris Koeritz                                                     *
*                                                                             *
*******************************************************************************
* Copyright (c) 1998-$now By Author.  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 is online at:      *
*     http://www.fsf.org/copyleft/gpl.html                                    *
* Please send any updates to: fred@gruntose.com                               *
\*****************************************************************************/
 
#include "safe_callback.h"
 
#include <structures/unique_id.h>
 
namespace processes {
 
// forward:
class letter;
 
 
class mail_stop : public safe_callback
{
public:
 
  // it is required that the derived mail_stop invoke the end_availability()
  // method in its destructor before it destroys any other objects.
 
  class items_to_deliver : public callback_data_block {
  public:
    items_to_deliver(const structures::unique_int &id, letter *package)
        : _id(id), _package(package) {}
    const structures::unique_int &_id;
    letter *_package;
  };
 
  virtual void delivery_for_you(const structures::unique_int &id, letter *package) = 0;
 
protected:
 
  virtual void real_callback(callback_data_block &data) {
    items_to_deliver *bits = dynamic_cast<items_to_deliver *>(&data);
    if (!bits) return;  // bad type.
    delivery_for_you(bits->_id, bits->_package);
  }
 
};
 
} //namespace.
 
#endif