* Fortran C interoperabiltiy documentation
@ 2019-06-21 21:47 NightStrike
2019-06-24 8:05 ` N.M. Maclaren
0 siblings, 1 reply; 2+ messages in thread
From: NightStrike @ 2019-06-21 21:47 UTC (permalink / raw)
To: fortran, gcc-help
https://gcc.gnu.org/onlinedocs/gfortran/Working-with-Pointers.html
"If a pointer is a dummy-argument of an interoperable procedure, it
usually has to be declared using the VALUE attribute. void* matches
TYPE(C_PTR), VALUE, while TYPE(C_PTR) alone matches void**."
What does "usually" mean in this context? Under what conditions do we
have to do this?
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Fortran C interoperabiltiy documentation
2019-06-21 21:47 Fortran C interoperabiltiy documentation NightStrike
@ 2019-06-24 8:05 ` N.M. Maclaren
0 siblings, 0 replies; 2+ messages in thread
From: N.M. Maclaren @ 2019-06-24 8:05 UTC (permalink / raw)
To: NightStrike; +Cc: fortran, gcc-help
On Jun 21 2019, NightStrike wrote:
>https://gcc.gnu.org/onlinedocs/gfortran/Working-with-Pointers.html
>
>"If a pointer is a dummy-argument of an interoperable procedure, it
>usually has to be declared using the VALUE attribute. void* matches
>TYPE(C_PTR), VALUE, while TYPE(C_PTR) alone matches void**."
>
>What does "usually" mean in this context? Under what conditions do we
>have to do this?
Just as it says. Use VALUE to match 'void *' and not to match 'void **';
the former is more common in C interfaces.
Regards,
Nick Maclaren.
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2019-06-24 8:05 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-06-21 21:47 Fortran C interoperabiltiy documentation NightStrike
2019-06-24 8:05 ` N.M. Maclaren
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).