Block.h revision 276789 
1284345Ssjg/*
2284345Ssjg * Block.h
3284345Ssjg *
4284345Ssjg * Copyright 2008-2010 Apple, Inc. Permission is hereby granted, free of charge,
5284345Ssjg * to any person obtaining a copy of this software and associated documentation
6284345Ssjg * files (the "Software"), to deal in the Software without restriction,
7284345Ssjg * including without limitation the rights to use, copy, modify, merge, publish,
8284345Ssjg * distribute, sublicense, and/or sell copies of the Software, and to permit
9284345Ssjg * persons to whom the Software is furnished to do so, subject to the following
10284345Ssjg * conditions:
11284345Ssjg *
12284345Ssjg * The above copyright notice and this permission notice shall be included in
13284345Ssjg * all copies or substantial portions of the Software.
14284345Ssjg *
15284345Ssjg * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16284345Ssjg * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17284345Ssjg * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18284345Ssjg * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19284345Ssjg * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20284345Ssjg * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 *
23 */
24
25#ifndef _BLOCK_H_
26#define _BLOCK_H_
27
28#if !defined(BLOCK_EXPORT)
29#   if defined(__cplusplus)
30#       define BLOCK_EXPORT extern "C"
31#   else
32#       define BLOCK_EXPORT extern
33#   endif
34#endif
35
36#if defined(__cplusplus)
37extern "C" {
38#endif
39
40/* Create a heap based copy of a Block or simply add a reference to an existing one.
41 * This must be paired with Block_release to recover memory, even when running
42 * under Objective-C Garbage Collection.
43 */
44BLOCK_EXPORT void *_Block_copy(const void *aBlock);
45
46/* Lose the reference, and if heap based and last reference, recover the memory. */
47BLOCK_EXPORT void _Block_release(const void *aBlock);
48
49#if defined(__cplusplus)
50}
51#endif
52
53/* Type correct macros. */
54
55#define Block_copy(...) ((__typeof(__VA_ARGS__))_Block_copy((const void *)(__VA_ARGS__)))
56#define Block_release(...) _Block_release((const void *)(__VA_ARGS__))
57
58
59#endif
60