Objective-C でsingleton pattern - Islands in the byte stream (legacy)
Objective-Cではマルチスレッドでも安全にsingleton objectを初期化するための dispatch_once() というのが使えるようだけど、double-checked lockingは多少効果があるようだ。 ただ最近の gcc/clangはデフォルトで -fthreadsafe-statics が有効なので Objective C++ だと dispatch_once() すら使うことなく安全に初期化できるはずで、無用なhackかもしれない。要検証。 #import <ctime> #import <Foundation/Foundation.h> // simple ver. NSString* getInstance1() { static dispatch_once_t guard; static NSString* instance = nil; dispa
Objective-C Singleton Pattern Updated For Testability
At Two Bit Labs we do a fair amount of unit testing. In places where we use singletons we use a variation on the the Objective-C dispatch_once pattern of thread safe singleton creation. This variation supports resetting the singleton or replacing it with a mock object. That way in our unit tests we can do the following: // we can replace it with a mock object id mockManager = [OCMockObject mockFor
Using the Singleton Pattern in Objective-C Part 2 – Duck Rowing
A while back I described a method for creating singletons in Objective-C. Since I wrote that, Apple has released automatic reference counting. My original example demonstrated how to prevent reference counts for singletons from decreasing. While this is still a valid approach, it would be nice to not have to get involved with reference counting at all. Also, the basic template for a singleton was
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Cocoa Design Patterns | Apple Developer Documentation
