singleton pattern in cocoa
singleton pattern in cocoa
- Subject: singleton pattern in cocoa
- From: Manuel Grau <email@hidden>
- Date: Thu, 10 Sep 2009 22:07:36 +0200
Hi all,
As I come from java world, I was trying to implement the singleton
pattern, very usual in java. After searching in internet I found this
code from wikipedia:
@interface MySingleton : NSObject
{
}
+ (MySingleton *)sharedSingleton;
@end
@implementation MySingleton
static MySingleton *sharedSingleton;
+ (MySingleton *)sharedSingleton
{
@synchronized(self)
{
if (!sharedSingleton)
[[MySingleton alloc] init];
return sharedSingleton;
}
}
+(id)alloc
{
@synchronized(self)
{
NSAssert(sharedSingleton == nil, @"Attempted to allocate a second
instance of a singleton.");
sharedSingleton = [super alloc];
return sharedSingleton;
}
}
@end
What do you think about this implementation? I'm newbie with cocoa and
I'm not sure.
Thanks.
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