64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
/* weakptr.h - An object which supports weak pointers.
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*
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* Copyright (C) 2010 Julian Andres Klode <jak@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#ifndef WEAK_POINTER_H
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#define WEAK_POINTER_H
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#include <cstddef>
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#include <set>
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/**
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* Class for objects providing support for weak pointers.
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*
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* This class allows for the registration of certain pointers as weak,
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* which will cause them to be set to NULL when the destructor of the
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* object is called.
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*/
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class WeakPointable {
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private:
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std::set<WeakPointable**> pointers;
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public:
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/**
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* Add a new weak pointer.
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*/
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inline void AddWeakPointer(WeakPointable** weakptr) {
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pointers.insert(weakptr);
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}
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/**
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* Remove the weak pointer from the list of weak pointers.
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*/
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inline void RemoveWeakPointer(WeakPointable **weakptr) {
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pointers.erase(weakptr);
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}
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/**
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* Deconstruct the object, set all weak pointers to NULL.
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*/
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~WeakPointable() {
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std::set<WeakPointable**>::iterator iter = pointers.begin();
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while (iter != pointers.end())
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**(iter++) = NULL;
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}
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};
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#endif // WEAK_POINTER_H
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