(j3.2006) Does F2015 allow assumed-rank components in derived types?

[Tom Clune]

On Jan 12, 2015, at 8:11 PM, Malcolm Cohen <malcolm at nag-j.co.jp> wrote:

> Tom Clune asks:
>> Does F2015 allow assumed-rank components in derived types?
> 
> Ask Bill replied, no.
> 
> Assumed rank is only for dummy variables.  Just like assumed shape.  And unlike 
> assumed shape, it is really only for interoperation with C.
> 
> If we were to add a concept of "deferred rank" we could then have (nondummy) 
> pointers and allocatables of deferred rank, just as we do for deferred shape; 
> this would include components.

Right.  I should have caught that nuance in the name.   In developer-land, we rarely refer to ?deferred shape?, preferring to just say dynamically allocated.

> 
> However, that would be pretty useless without a few other things like SELECT 
> RANK.  It would be significant work to develop this idea.

Hmm.   ?select case (rank(foo))?  seems to be close enough to get real work done.  I really do think that with just that and existing features (shape(foo), c_f_pointer(), etc) one could make some useful packages that rely on deferred rank.   But certainly a handful of new features  would improve developers? ability to exploit deferred rank.

This capability is not at the top of my priorities, but does seem to be a natural ?closure? of existing syntax. 

Cheers,

- Tom





> 
> Cheers,
> -- 
> ................................Malcolm Cohen, Nihon NAG, Tokyo. 
> 
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Thomas Clune, Ph. D. 				<Thomas.L.Clune at nasa.gov>
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