Re: [boost] [intrusive] rtti_base class proposition

Subject: Re: [boost] [intrusive] rtti_base class proposition
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2009-10-22 09:40:31

Joel Falcou wrote:
> Ireneusz Szpilewski wrote:
> > there is a Factory making plastic Cats and Dogs. They make
> > some cats and dogs
> > every day. Truck drivers arrive from time to time and get
> > new products for
> > further processing. Plastic cats and dogs are not sorted by
> > the factory, they
> > are mixed together and have the same price.
> >
> > How the factory should be modeled?
> >
> > struct Factory
> > {
> >    ?
> > };
>
> you just have to have Cat and Dog inherit from FactoryProduct and not
> from an arbitrary cosmic base class that has no meaning in the model.
>
> That's object design 101

Exactly my thought and what I was attempting to convey in my earlier replies: I think the OP is stuck in the misguided mindset of using pointers to a weak ABC + dynamic_cast to handle variations, hence the wish for a "cosmic base class."  That's why I suggested, for example, the Visitor Pattern, to a previous query.

_____
Rob Stewart                           robert.stewart_at_[hidden]
Software Engineer, Core Software      using std::disclaimer;
Susquehanna International Group, LLP  http://www.sig.com

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