From: "Philippe A. Bouchard" <philippeb@[...].ca> 


>  > The standard doesn't guarantee that the offset calculated from a given
>  > static_cast will work again, given the same source and target types.
>  > Actually doing the static_cast is the only portable way to find the
Base*
>  > from a Derived*. Indirection through a function pointer which does the
>  > static_cast might be an option.
> 
>  I read somewhere an integer is always the size of a pointer.  What about
a
>  (void *) in the worse case?

You read wrong. Please get a copy of the standard and start studying. It
isn't fair to push a design that uses low-level hacks here without having
done at least some of the legwork to come to grips with what is and is not
conforming.

-Dave

-----------------------------------------------------------
           David Abrahams * Boost Consulting
dave@[...].com * http://www.boost-consulting.com


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