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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> 00025 #include <stddef.h> 00026 00034 class WeakPointable { 00035 private: 00036 std::set<WeakPointable**> pointers; 00037 00038 public: 00039 00043 inline void AddWeakPointer(WeakPointable** weakptr) { 00044 pointers.insert(weakptr); 00045 } 00046 00050 inline void RemoveWeakPointer(WeakPointable **weakptr) { 00051 pointers.erase(weakptr); 00052 } 00053 00057 ~WeakPointable() { 00058 std::set<WeakPointable**>::iterator iter = pointers.begin(); 00059 while (iter != pointers.end()) 00060 **(iter++) = NULL; 00061 } 00062 }; 00063 00064 #endif // WEAK_POINTER_H