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main_obs.H

Go to the documentation of this file.

/*
 * Copyright 2001, Brown University, Providence, RI.
 * 
 *                         All Rights Reserved
 * 
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose other than its incorporation into a
 * commercial product is hereby granted without fee, provided that the
 * above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Brown University not be used in
 * advertising or publicity pertaining to distribution of the software
 * without specific, written prior permission.
 * 
 * BROWN UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ANY
 * PARTICULAR PURPOSE.  IN NO EVENT SHALL BROWN UNIVERSITY BE LIABLE FOR
 * ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#ifndef MAIN_OBS_H
#define MAIN_OBS_H

#include "std/list.H"

class MAINobs {
   public :
      class data {
         public :
         data() { }
      };
   virtual void notify(const data &) = 0;
};

class MAIN_observers : public OBSlist<MAINobs> {
     int _main_has_run;

   public:
     MAIN_observers():_main_has_run(0) { }

     int has_main_run() { return _main_has_run; }
 
     void obs(MAINobs *o) { if (_main_has_run)
                              o->notify(MAINobs::data());
                            else OBSlist<MAINobs>::obs(o); 
                          }

     void notify()        { _main_has_run = 1;  
                            OBSlist<MAINobs>::notify(MAINobs::data()); }
};

extern DllImpExp MAIN_observers &MAINobservers();

#endif

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