all tasks

Task/Singleton/Objective-C/singleton-2.m

@@ -0,0 +1,38 @@
+// SomeSingleton.m
+@implementation SomeSingleton
+
++ (SomeSingleton*) sharedInstance
+{
+   static sharedInstance = nil;
+   if(!sharedInstance) {
+      sharedInstance = [[SomeSingleton alloc] init];
+   }
+   return sharedInstance;
+}
+
+- (id)copyWithZone:(NSZone *)zone
+{
+    return self;
+}
+
+- (id)retain
+{
+    return self;
+}
+
+- (unsigned)retainCount
+{
+    return UINT_MAX;
+}
+
+- (void)release
+{
+    // prevent release
+}
+
+- (id)autorelease
+{
+    return self;
+}
+
+@end