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/*************************************************************************
* Copyright (C) 2011 Tavian Barnes <tavianator@tavianator.com> *
* *
* 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 *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* Generic reference count implementation.
*/
/**
* Reference counter.
*/
typedef unsigned int dmnsn_refcount;
/**
* Increment a reference count.
* @param[in,out] object The reference-counted object to acquire.
*/
#define DMNSN_INCREF(object) \
do { \
/* Suppress "address will always evaluate to true" warning */ \
void *testptr = (object); \
if (testptr) { \
++(object)->refcount; \
} \
} while (0)
/**
* @internal
* Decrement a reference count.
* @param[in,out] object The reference-counted object to release.
* @return Whether the object is now garbage.
*/
#define DMNSN_DECREF(object) \
((object) && ((object)->refcount == 0 || --(object)->refcount == 0))
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