/* weakptr.h - An object which supports weak pointers. * * Copyright (C) 2010 Julian Andres Klode <jak@debian.org> * * 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 WEAK_POINTER_H #define WEAK_POINTER_H #include <set> #include <stddef.h> /** * Class for objects providing support for weak pointers. * * This class allows for the registration of certain pointers as weak, * which will cause them to be set to NULL when the destructor of the * object is called. */ class WeakPointable { private: std::set<WeakPointable**> pointers; public: /** * Add a new weak pointer. */ inline void AddWeakPointer(WeakPointable** weakptr) { pointers.insert(weakptr); } /** * Remove the weak pointer from the list of weak pointers. */ inline void RemoveWeakPointer(WeakPointable **weakptr) { pointers.erase(weakptr); } /** * Deconstruct the object, set all weak pointers to NULL. */ ~WeakPointable() { std::set<WeakPointable**>::iterator iter = pointers.begin(); while (iter != pointers.end()) **(iter++) = NULL; } }; #endif // WEAK_POINTER_H