Hi,
On Mon, 19 Jun 2000, Toon Moene wrote:
> Malcolm Cohen wrote:
>
> > NAGWare f90/f95 supports LOGICAL(KIND=1) and INTEGER(KIND=1) as single-byte
> > values on all hardware platforms.
>
> [ This is not meant to hassle Malcolm ]
>
> I've seen several mails like this pass the mailing list now. Does
> anyone have an idea how to portably ask for LOGICAL(KIND=1), i.e.
> without using an explicit KIND number.
>
> Yes, I know it's non-Standard - but if more than one compiler supports
> it, it would be nice if there were a portable way to ask for the
> feature.
Yup, but there is none.
On comp.lang.fortran, I suggested the following definition of
SELECTED_LOGICAL_KIND.
Since the range of a logical is always {T,F}, there is no need
to provide a range in the arg list. Therefore I'd specify it
as follows.
SELECTED_LOGICAL_KIND( [MOLD] )
without the optional MOLD argument, SELECTED_LOGICAL_KIND returns
the smallest logical that can hold the (implicit) range.
With MOLD, SELECTED_LOGICAL_KIND returns the KIND of a logical
that is the same size as MOLD, if there is one, or a negative value,
if there is not.
Since a default-KIND INTEGER is the same size as a default-KIND
LOGICAL, the following would return default LOGICAL KIND;
INTEGER KLOG, I
KLOG = SELECTED_LOGICAL_KIND( I )
This still wouldn't allow for selecting a LOGICAL KIND that was
not the smallest available, but was different in size from any
other type. Still, that might not arise, and I believe this
proposal is pretty good, overall.
-P.
--
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