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Singleton Class

/ Published in: Objective C
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  1. #import "SomeClass.h"
  2.  
  3. static SomeClass *instance = nil;
  4.  
  5. @implementation SomeClass
  6.  
  7. #pragma mark -
  8. #pragma mark Singleton
  9.  
  10. + (id)instance
  11. {
  12. 	@synchronized(self)
  13. 	{
  14. 		if (instance == nil)
  15. 			instance = [[super allocWithZone:NULL] init];
  16. 	}
  17. 	return instance;
  18. }
  19.  
  20. + (id)allocWithZone:(NSZone *)zone
  21. {
  22. 	return [[self instance] retain];
  23. }
  24.  
  25. - (id)copyWithZone:(NSZone *)zone 
  26. {
  27.     return self;
  28. }
  29.  
  30. - (id)retain 
  31. {
  32.     return self;
  33. }
  34.  
  35. - (unsigned)retainCount {
  36.     return UINT_MAX; 
  37. }
  38.  
  39. - (void)release 
  40. {
  41.     // never release
  42. }
  43.  
  44. - (id)autorelease 
  45. {
  46.     return self;
  47. }
  48.  
  49. - (id)init
  50. {
  51. 	if (self = [super init])
  52. 	{
  53. 	}
  54. 	return self;
  55. }
  56.  
  57. @end

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