AS3强制单例

Posted 2021-02-26

This implementation of the singleton pattern provides a way to enforce singleton usage. There are numerous Singleton implementations for AS3 (due to the lack of private constructor) this method, is the cleanest I've seen so far.

package mypackage
{
	public class SingletonExample
	{
		public function SingletonExample(enforcer:SingletonEnforcer)
		{
		}
 
		private static var _instance : SingletonExample;
 
		public static function getInstance():SingletonExample
		{
			if (_instance == null)
				_instance = new SingletonExample(new SingletonEnforcer());
 
			return _instance;
		}
	}
}
class SingletonEnforcer {}