On Tue, Oct 12, 2010 at 1:14 PM, Michael Link <ml...@fractal.net> wrote:
> In the documentation for NSPersistentDocument's method -managedObjectModel it
> says the following addition in a subclass can be used to improve efficiency
> if all the documents share the same model.
>
>> - (id)managedObjectModel {
>> static id sharedModel = nil;
>> if (sharedModel == nil) {
>> sharedModel = [[super managedObjectModel] retain];
>> }
>> return sharedModel;
>> }
>
> If the app is running on 10.6 and returns YES for
> canConcurrentlyReadDocumentsOfType I'm assuming some sort of synchronization
> would be necessary here?
Sure, you could do this:
- (id)managedObjectModel {
static id sharedModel;
static dispatch_once_t once;
dispatch_once(&once, ^{ sharedModel = [[super managedObjectModel] retain]; });
return sharedModel;
}
--Kyle Sluder
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