As of now, it is not possible to declare a constructor private (other
than public) in ActionScript 3.0. However, as pointed out, it is
possible to achieve the required behavior by using a dummy private
class defined outside the package so that no one has access to it
outside the file. Passing a dummy instance of this class to the
constructor of the singleton class should prevent other users from
instantiating the singleton class. Here is a code snippet illustrating
the concept:
package
{
class Singleton
{
private static var theOneAndOnlyInstance:Singleton;
public function Singleton(dummy:DummyPrivateClass)
{
super();
}
public static function getInstance():Singleton
{
if(theOneAndOnlyInstance == null)
{
theOneAndOnlyInstance = new Singleton(new
DummyPrivateClass());
}
return theOneAndOnlyInstance;
}
}
}
class DummyPrivateClass
{
public function DummyPrivateClass() { super(); }
}
HTH.
