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SynthesizeSingleton definition header

/ Published in: Objective C
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This class is used to turn an object into a singleton.

Usage : SYNTHESIZE_SINGLETON_FOR_CLASS(ClassName);

Place in your implementation.

thank you Matt Gallagher

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  1. //
  2. //  SynthesizeSingleton.h
  3. //  CocoaWithLove
  4. //
  5. //  Created by Matt Gallagher on 20/10/08.
  6. //  Copyright 2009 Matt Gallagher. All rights reserved.
  7. //
  8. //  Permission is given to use this source code file without charge in any
  9. //  project, commercial or otherwise, entirely at your risk, with the condition
  10. //  that any redistribution (in part or whole) of source code must retain
  11. //  this copyright and permission notice. Attribution in compiled projects is
  12. //  appreciated but not required.
  13. //
  14.  
  15. #define SYNTHESIZE_SINGLETON_FOR_CLASS(classname) \
  16.  \
  17. static classname *shared##classname = nil; \
  18.  \
  19. + (classname *)shared##classname \
  20. { \
  21. 	@synchronized(self) \
  22. 	{ \
  23. 		if (shared##classname == nil) \
  24. 		{ \
  25. 			shared##classname = [[self alloc] init]; \
  26. 		} \
  27. 	} \
  28. 	 \
  29. 	return shared##classname; \
  30. } \
  31.  \
  32. + (id)allocWithZone:(NSZone *)zone \
  33. { \
  34. 	@synchronized(self) \
  35. 	{ \
  36. 		if (shared##classname == nil) \
  37. 		{ \
  38. 			shared##classname = [super allocWithZone:zone]; \
  39. 			return shared##classname; \
  40. 		} \
  41. 	} \
  42. 	 \
  43. 	return nil; \
  44. } \
  45.  \
  46. - (id)copyWithZone:(NSZone *)zone \
  47. { \
  48. 	return self; \
  49. } \
  50.  \
  51. - (id)retain \
  52. { \
  53. 	return self; \
  54. } \
  55.  \
  56. - (NSUInteger)retainCount \
  57. { \
  58. 	return NSUIntegerMax; \
  59. } \
  60.  \
  61. - (void)release \
  62. { \
  63. } \
  64.  \
  65. - (id)autorelease \
  66. { \
  67. 	return self; \
  68. }

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