[boost] Re: Sealed/Final implementation.

From: Tom Widmer (tom_usenet_at_[hidden])
Date: 2005-01-13 10:53:30

Jonathan Wakely wrote:
> On Thu, Jan 13, 2005 at 12:49:33PM +1000, kalin wrote:
> 
> 
>>Hi All, I've made a simple implementation of making a class non-derivable.
> 
> 
> I can't compile this with GCC3 or Comeau.
> GCC2 lets me compile it (due to its flakey friend implementation) but it
> also allows Bar to inherit from Foo!
> 
> This is a simpler way of preventing inheritance:
> 
>   class Finaliser
>   {
>   protected:
>     Finaliser(){}
>   };
> 
>   class Final : private virtual Finaliser
>   {
>     // rest of class as normal
>   };

How about:

class Finaliser
{
   friend class Final;
   Finaliser(){}
};

class Final : private virtual Finaliser
{
};

?

Tom