yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> No, since static_cast is called inside condition where dynamic_cast
> checked the type already. It is useless to use YADE_CAST after
> dynamic_cast, though (two dynamic_casts in debug mode).
>
>   

Ah, true.

> > If I remember correctly, dynamic_casts are very slow, so I would go for 
> > the second option.
> >     
> I never measured it. It cannot be in principle slower than virtual
> function dispatch (since that also has to determine exact instance type,
> just like dynamic_cast), and those are used allover yade (every functor
> call is a virtual function, getClassIndex is virtual as well etc.
>
>   
I measured that a few years ago. Dynamic_casts where using at least 50% 
of CPU time in many engines.
Static_casts use 0% of course, since they do nothing at runtime.

>   int sphereIds=Sphere::getClassIndexStatic();
>
>   
Emanuele just showed me that this member is private currently.

Bruno

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