MySingleton.m

gistfile1.m

@implementation MySingleton
static MySingleton* _sharedInstance = nil;
 
+(MySingleton*)getInstance
{
  @synchronized([MySingleton class])
  {
    if (!_sharedInstance)
      [[self alloc] init];
      return _sharedInstance;
    }
  return nil;
}
 
+(id)alloc
{
  @synchronized([MySingleton class])
    {
    NSAssert(_sharedInstance == nil, 
      @"Attempted to allocate a second instance of a singleton.");
    _sharedInstance = [super alloc];
    return _sharedMySingleton;
  }
  return nil;
}
 
-(id)init {
  self = [super init];
  if (self != nil) {
    // initialize stuff here
  }
  return self;
}
 
-(void)doSomething {
  NSLog(@"Do the thing client want!");
}
@end