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/* 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 <cstddef>
#include <set>
/**
* 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
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