Armetiz

public class Master
{
	private static var _jeton	: Number	= -1;
 
	public function Master()
	{
	}
 
	public static function createSlave () : Slave
	{
		var _tmpSlave	: Slave;
 
		_jeton		= Math.random() * 500;
		_tmpSlave	= new Slave (_jeton);
		_jeton		= -1;
 
		return _tmpSlave;			
	}
 
	public static function get jeton () : Number
	{
		return _jeton;
	}
}

public class Slave
{
	public function Slave(_pJeton : Number = 0) : void
	{
		if (Master.jeton !== _pJeton && Master.jeton !== -1)
			throw new Error ("Instanciation obligatoire par Master.createSlave");
	}
}

new Slave (); //throw Error
Master.createSlave (); //Retourne un objet du type Slave