00001 // vim:expandtab:autoindent:tabstop=4:shiftwidth=4:filetype=c: 00002 /* 00003 * Copyright (C) 2005 Dell Inc. 00004 * by Michael Brown <Michael_E_Brown@dell.com> 00005 * Licensed under the Open Software License version 2.1 00006 * 00007 * Alternatively, you can redistribute it and/or modify 00008 * it under the terms of the GNU General Public License as published 00009 * by the Free Software Foundation; either version 2 of the License, 00010 * or (at your option) any later version. 00011 00012 * This program is distributed in the hope that it will be useful, but 00013 * WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 00015 * See the GNU General Public License for more details. 00016 */ 00017 00018 00019 #ifndef IOBSERVER_H 00020 #define IOBSERVER_H 00021 00022 // compat header should always be first header 00023 #include "smbios/compat.h" 00024 00025 #include <list> 00026 00027 // abi_prefix should be last header included before declarations 00028 #include "smbios/config/abi_prefix.hpp" 00029 00030 namespace observer 00031 { 00032 // forward declarations 00033 class IObservable; 00034 00035 class IObserver 00036 { 00037 public: 00038 virtual ~IObserver(); 00039 virtual void update( const IObservable *whatChanged, void *param = 0 ) = 0; 00040 protected: 00041 IObserver(); 00042 }; 00043 00044 class IObservable 00045 { 00046 public: 00047 virtual ~IObservable(); 00048 00049 virtual void attach( IObserver * ) const; 00050 virtual void detach( IObserver * ) const; 00051 virtual void notify( void *param = 0 ) const; 00052 protected: 00053 IObservable(); 00054 00055 private: 00056 mutable std::list<IObserver *> observers; 00057 }; 00058 00059 } 00060 00061 // always should be last thing in header file 00062 #include "smbios/config/abi_suffix.hpp" 00063 00064 #endif /* IOBSERVER_H */