ActionScript 3 Singleton Pattern Singleton enforcer via private instance
Example
In this approach, the single is accessed via the static method:
Singleton.getInstance();
To enforce only one instance of the singleton, a private static variable retains the instance, while any additional attempts to instantiate an instance are enforced within the constructor.
package {
public class Singleton {
/** Singleton instance */
private static var _instance: Singleton = new Singleton();
/** Return singleton instance. */
public static function getInstance():Singleton {
return _instance;
}
/** Constructor as singleton enforcer. */
public function Singleton() {
if (_instance)
throw new Error("Singleton is a singleton and can only be accessed through Singleton.getInstance()");
}
}
}
