/************************************************************************* * Copyright (C) 2011 Tavian Barnes * * * * This file is part of The Dimension Library. * * * * The Dimension Library is free software; you can redistribute it and/ * * or modify it under the terms of the GNU Lesser General Public License * * as published by the Free Software Foundation; either version 3 of the * * License, or (at your option) any later version. * * * * The Dimension Library 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 * * Lesser General Public License for more details. * * * * You should have received a copy of the GNU Lesser General Public * * License along with this program. If not, see * * . * *************************************************************************/ /** * @file * Generic reference count implementation. */ /** * Increment a reference count. * @param[in,out] object The reference-counted object to acquire. */ #define DMNSN_INCREF(obj) ((void)++(*(obj)->refcount)) /** * Decrement a reference count. * @param[in,out] object The reference-counted object to release. * @return Whether the object is now garbage. */ #define DMNSN_DECREF(obj) (*(obj)->refcount == 0 || --(*(obj)->refcount) == 0) /** * Reference counter. */ typedef unsigned int dmnsn_refcount; /** * Create a reference count. * @return A new reference counter, initialized to zero (a "borrowed" reference, * which will be garbage-collected the first time it is deleted). */ dmnsn_refcount *dmnsn_new_refcount(void); /** * Delete a reference count. Raises an error if the reference count wasn't * zero. */ void dmnsn_delete_refcount(dmnsn_refcount *refcount);