I decided to do a singleton class (see code)... but i found that i could not
hide the ctor of the singleton derived classes.
Is there anyway to make it private? IMHO only this way the singleton class
makes sense.

class Singleton(T){
public:
 static T handle(){
  if (_instance === null){
   synchronized {
    if(!_handle) _handle = new T();
   }
  }
  return _handle;
 }

private:
  this() {}
  static T _handle;
};

Private apparently does not yet apply to constructors, but let's hope Walter will change that.

Additionally, you might consider using a static constructor for the initialization:

static this()
{
    _handle = new T();
}

... which is perhaps a better way to avoid race conditions.

- Kris

"Miguel Ferreira Simões" <kobold@netcabo.pt> wrote in message news:c9fv3u$16hf$1@digitaldaemon.com...
> I decided to do a singleton class (see code)... but i found that i could
not
> hide the ctor of the singleton derived classes.
> Is there anyway to make it private? IMHO only this way the singleton class
> makes sense.
>
> class Singleton(T){
> public:
>  static T handle(){
>   if (_instance === null){
>    synchronized {
>     if(!_handle) _handle = new T();
>    }
>   }
>   return _handle;
>  }
>
> private:
>   this() {}
>   static T _handle;
> };
>
>