Re: singleton pattern in cocoa
Re: singleton pattern in cocoa
- Subject: Re: singleton pattern in cocoa
- From: Jean-Daniel Dupas <email@hidden>
- Date: Mon, 14 Sep 2009 18:51:02 +0200
Definition of true singleton is generally discouraged and not really
useful.
See more info about it here:
http://eschatologist.net/blog/?p=178
Le 10 sept. 2009 à 22:07, Manuel Grau a écrit :
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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-- Jean-Daniel
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