Block.h

/*
 * Block.h
 *
 * Copyright 2008-2010 Apple, Inc. Permission is hereby granted, free of charge,
 * to any person obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to permit
 * persons to whom the Software is furnished to do so, subject to the following
 * conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#ifndef _BLOCK_H_
#define _BLOCK_H_

#if !defined(BLOCK_EXPORT)
#   if defined(__cplusplus)
#       define BLOCK_EXPORT extern "C"
#   else
#       define BLOCK_EXPORT extern
#   endif
#endif

#if defined(__cplusplus)
extern "C" {
#endif

/* Create a heap based copy of a Block or simply add a reference to an existing one.
 * This must be paired with Block_release to recover memory, even when running
 * under Objective-C Garbage Collection.
 */
BLOCK_EXPORT void *_Block_copy(const void *aBlock);

/* Lose the reference, and if heap based and last reference, recover the memory. */
BLOCK_EXPORT void _Block_release(const void *aBlock);

#if defined(__cplusplus)
}
#endif

/* Type correct macros. */

#define Block_copy(...) ((__typeof(__VA_ARGS__))_Block_copy((const void *)(__VA_ARGS__)))
#define Block_release(...) _Block_release((const void *)(__VA_ARGS__))


#endif