Re: Fortran C interoperabiltiy documentation

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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.




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