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callback.h

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00001 /* ScummVM - Graphic Adventure Engine
00002  *
00003  * ScummVM is the legal property of its developers, whose names
00004  * are too numerous to list here. Please refer to the COPYRIGHT
00005  * file distributed with this source distribution.
00006  *
00007  * This program is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License
00009  * as published by the Free Software Foundation; either version 2
00010  * of the License, or (at your option) any later version.
00011  *
00012  * This program is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
00020  *
00021  */
00022 
00023 #ifndef COMMON_CALLBACK_H
00024 #define COMMON_CALLBACK_H
00025 
00026 namespace Common {
00027 
00042 template<typename S = void *> class BaseCallback {
00043 public:
00044     BaseCallback() {}
00045     virtual ~BaseCallback() {}
00046     virtual void operator()(S data) = 0;
00047 };
00048 
00056 template<typename T> class GlobalFunctionCallback: public BaseCallback<T> {
00057     typedef void(*GlobalFunction)(T result);
00058     GlobalFunction _callback;
00059 
00060 public:
00061     GlobalFunctionCallback(GlobalFunction cb): _callback(cb) {}
00062     virtual ~GlobalFunctionCallback() {}
00063     virtual void operator()(T data) {
00064         if (_callback) _callback(data);
00065     }
00066 };
00067 
00082 template<class T, typename S = void *> class Callback: public BaseCallback<S> {
00083 protected:
00084     typedef void(T::*TMethod)(S);
00085     T *_object;
00086     TMethod _method;
00087 public:
00088     Callback(T *object, TMethod method): _object(object), _method(method) {}
00089     virtual ~Callback() {}
00090     void operator()(S data) { (_object->*_method)(data); }
00091 };
00092 
00124 template<class T, typename OS, typename S = void *> class CallbackBridge: public BaseCallback<S> {
00125     typedef void(T::*TCallbackMethod)(BaseCallback<OS> *, S);
00126     T *_object;
00127     TCallbackMethod _method;
00128     BaseCallback<OS> *_outerCallback;
00129 public:
00130     CallbackBridge(T *object, TCallbackMethod method, BaseCallback<OS> *outerCallback):
00131         _object(object), _method(method), _outerCallback(outerCallback) {}
00132     virtual ~CallbackBridge() {}
00133     void operator()(S data) { (_object->*_method)(_outerCallback, data); }
00134 };
00135 
00136 } // End of namespace Common
00137 
00138 #endif


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