weakptr.h

00001 /* weakptr.h - An object which supports weak pointers.
00002  *
00003  * Copyright (C) 2010 Julian Andres Klode <jak@debian.org>
00004  * 
00005  * This program is free software; you can redistribute it and/or modify
00006  * it under the terms of the GNU General Public License as published by
00007  * the Free Software Foundation; either version 2 of the License, or
00008  * (at your option) any later version.
00009  *
00010  * This program is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  * GNU General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU General Public License
00016  * along with this program; if not, write to the Free Software
00017  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
00018  * MA 02110-1301, USA.
00019  */
00020 
00021 #ifndef WEAK_POINTER_H
00022 #define WEAK_POINTER_H
00023 
00024 #include <set>
00032 class WeakPointable {
00033 private:
00034     std::set<WeakPointable**> pointers;
00035 
00036 public:
00037 
00041     inline void AddWeakPointer(WeakPointable** weakptr) {
00042        pointers.insert(weakptr);
00043     }
00044 
00048     inline void RemoveWeakPointer(WeakPointable **weakptr) {
00049        pointers.erase(weakptr);
00050     }
00051 
00055     ~WeakPointable() {
00056         std::set<WeakPointable**>::iterator iter = pointers.begin();
00057         while (iter != pointers.end())
00058             **(iter++) = NULL;
00059     }
00060 };
00061 
00062 #endif // WEAK_POINTER_H