CLOUD: Add object-oriented Callbacks

These callbacks can call object's methods, not some global C functions.

DropboxStorage::info2() and DropboxStorage::infoMethodCallback()
demonstrate the idea.

1 files changed, 47 insertions, 0 deletions

diff --git a/common/callback.h b/common/callback.h
new file mode 100644
index 0000000000..4cfdd53fd9
--- /dev/null
+++ b/common/callback.h
@@ -0,0 +1,47 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef COMMON_CALLBACK_H
+#define COMMON_CALLBACK_H
+
+namespace Common {
+
+class BaseCallback {
+public:
+	BaseCallback() {}
+	virtual ~BaseCallback() {}
+	virtual void operator()(void *ptr) = 0;
+};
+
+template<class T> class Callback: public BaseCallback {
+	typedef void(T::*TMethod)(void *);
+	T *_object;
+	TMethod _method;
+public:
+	Callback(T *object, TMethod method): _object(object), _method(method) {}
+	virtual ~Callback() {}
+	void operator()(void *ptr) { (_object->*_method)(ptr); }
+};
+
+} // End of namespace Common
+
+#endif