Singleton

public function Singleton(caller:Function = null):void
{
	if ( caller == hidden )
	{
		_instance = this;
	}
	else
	{
		throw new Error( "Please use the instance property to access." );
	}
}
 
public static function get instance():Singleton
{	
	if (!_instance)
	{
		new Singleton(hidden);
	}
	return _instance;
}
 
private static function hidden():void { }