presage  0.8.7
observable.h
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00001 
00002 /******************************************************
00003  *  Presage, an extensible predictive text entry system
00004  *  ---------------------------------------------------
00005  *
00006  *  Copyright (C) 2008  Matteo Vescovi <matteo.vescovi@yahoo.co.uk>
00007 
00008     This program is free software; you can redistribute it and/or modify
00009     it under the terms of the GNU General Public License as published by
00010     the Free Software Foundation; either version 2 of the License, or
00011     (at your option) any later version.
00012 
00013     This program is distributed in the hope that it will be useful,
00014     but WITHOUT ANY WARRANTY; without even the implied warranty of
00015     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00016     GNU General Public License for more details.
00017 
00018     You should have received a copy of the GNU General Public License along
00019     with this program; if not, write to the Free Software Foundation, Inc.,
00020     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00021                                                                              *
00022                                                                 **********(*)*/
00023 
00024 
00025 #ifndef PRESAGE_OBSERVABLE
00026 #define PRESAGE_OBSERVABLE
00027 
00028 #if HAVE_CONFIG_H
00029 # include "config.h"
00030 #endif
00031 
00032 #include "observer.h"
00033 
00034 #include <list>
00035 #include <string>
00036 
00037 class Observable {
00038 public:
00039     virtual ~Observable ();
00040   
00041     virtual void attach (Observer* observer);
00042     virtual void detach (Observer* observer);
00043     virtual void notify ();
00044 
00045     virtual std::string  get_name () const = 0;
00046     virtual std::string get_value () const = 0;
00047    
00048 protected:
00049     Observable ();
00050 
00051 private:
00052     std::list <Observer*> observers;
00053 
00054 };
00055 
00056 #endif // PRESAGE_OBSERVABLE