Ben Laurie wrote:
>
> Richard Levitte - VMS Whacker wrote:
> > The easiest way to avoid the conversions noted above is to have a
> > union like this:
> >
> > union foo {
> > void *simple;
> > int (*fn)();
> > };
> >
> > and use it internally. You put whatever char * you want to convert to
> > a functino pointer into simple and pull out the function pointer from
> > fn, and vice versa.
>
> That assumes that the conversion the compiler is attempting to prevent
> can actually be done, which is not, of course, a valid assumption. The
> only way to do this validly is to make the functions actually take a foo
> * as their argument, surely? And yes, then you may end up with a memory
> management problem (though often not, coz I'll bet in most cases you can
> make the foo static).
>
Hmmm. Do we have to use this on every platform, including those that
handled it before?
Can't we just have a macro or function that does the conversion? I.e. on
most platforms it would be a macro which expands to a cast but on VMS it
would end up calling a function.
Steve.
--
Dr Stephen N. Henson. http://www.drh-consultancy.demon.co.uk/
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