1  /*
 2   * Block.h
 3   *
 4   * Copyright 2008-2010 Apple, Inc. Permission is hereby granted, free of charge,
 5   * to any person obtaining a copy of this software and associated documentation
 6   * files (the "Software"), to deal in the Software without restriction,
 7   * including without limitation the rights to use, copy, modify, merge, publish,
 8   * distribute, sublicense, and/or sell copies of the Software, and to permit
 9   * persons to whom the Software is furnished to do so, subject to the following
10   * conditions:
11   * 
12   * The above copyright notice and this permission notice shall be included in
13   * all copies or substantial portions of the Software.
14   * 
15   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20   * 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)
37  extern "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   */
44  BLOCK_EXPORT void *_Block_copy(const void *aBlock);
45  
46  /* Lose the reference, and if heap based and last reference, recover the memory. */
47  BLOCK_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