[m-rev.] for review: mercury implementation of string__format

[Peter Ross]

fjh wrote:
> On 21-Nov-2002, Peter Ross <pro at missioncriticalit.com> wrote:
> > +:- pragma promise_pure(is_nan/1).
> > +:- pragma foreign_proc(c, is_nan(Flt::in),
> > + [will_not_call_mercury, thread_safe], "
> > +#if MR_USE_SINGLE_PREC_FLOAT
> > + SUCCESS_INDICATOR = isnanf(Flt);
> > +#else
> > + SUCCESS_INDICATOR = isnan(Flt);
> > +#endif
>
> The use of isnan() and isnanf() need to be protected by
> conditional compilation, since not all systems support them.
>
> Likewise for isinf() and isinff().
>
I plan to to call #error if is* aren't defined, but add a comment that it
may be safe to just return false if the system doesn't support IEEE
arthimetic.  Is this acceptable to everyone?


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