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Commit	Line	Data
	1	/* weakptr.h - An object which supports weak pointers.
	2	*
	3	* Copyright (C) 2010 Julian Andres Klode <jak@debian.org>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
	18	* MA 02110-1301, USA.
	19	*/
	20
	21	#ifndef WEAK_POINTER_H
	22	#define WEAK_POINTER_H
	23
	24	#include <set>
	25	#include <stddef.h>
	26
	27	/**
	28	* Class for objects providing support for weak pointers.
	29	*
	30	* This class allows for the registration of certain pointers as weak,
	31	* which will cause them to be set to NULL when the destructor of the
	32	* object is called.
	33	*/
	34	class WeakPointable {
	35	private:
	36	std::set<WeakPointable**> pointers;
	37
	38	public:
	39
	40	/**
	41	* Add a new weak pointer.
	42	*/
	43	inline void AddWeakPointer(WeakPointable** weakptr) {
	44	pointers.insert(weakptr);
	45	}
	46
	47	/**
	48	* Remove the weak pointer from the list of weak pointers.
	49	*/
	50	inline void RemoveWeakPointer(WeakPointable **weakptr) {
	51	pointers.erase(weakptr);
	52	}
	53
	54	/**
	55	* Deconstruct the object, set all weak pointers to NULL.
	56	*/
	57	~WeakPointable() {
	58	std::set<WeakPointable**>::iterator iter = pointers.begin();
	59	while (iter != pointers.end())
	60	**(iter++) = NULL;
	61	}
	62	};
	63
	64	#endif // WEAK_POINTER_H