Re: singleton pattern in cocoa
Re: singleton pattern in cocoa
- Subject: Re: singleton pattern in cocoa
- From: Alex Kac <email@hidden>
- Date: Mon, 14 Sep 2009 11:41:36 -0500
Probably best to use Apple's example:
http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/CocoaFundamentals/CocoaObjects/CocoaObjects.html#//apple_ref/doc/uid/TP40002974-CH4-SW32
I love Google, but I always prefer to look at Apple's docs first. I
found the above by going to developer.apple.com and typing in
"Singleton" in the search field.
On Sep 10, 2009, at 3:07 PM, Manuel Grau wrote:
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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