(j3.2006) Can initial-data-target be coindexed?

[Lionel, Steve]

Thanks. I uploaded 15-216 as an interp request.

Steve

-----Original Message-----
From: j3-bounces at mailman.j3-fortran.org
[mailto:j3-bounces at mailman.j3-fortran.org] On Behalf Of Bill Long
Sent: Thursday, August 13, 2015 4:10 PM
To: fortran standards email list for J3 <j3 at mailman.j3-fortran.org>
Subject: Re: (j3.2006) Can initial-data-target be coindexed?


You can deduce this is not allowed because pointer-assigning a pointer to a
target on a different image causes the association status of the pointer to
become undefined (16.5.2.5).  That contradicts the concept of the pointer
being "initialized".   But, it would be clearer to incorporate the
restriction in this case into a constraint.   Note that the constraint is a
bit stronger - the "different image" limitation would still allow this on
image 3.  However, the initialization occurs on every image, so the program
would be nonconforming.  It is simpler and clearer to say "not coindexed". 

Cheers,
Bill


On Aug 13, 2015, at 2:24 PM, Lionel, Steve <steve.lionel at intel.com> wrote:

>  
> So. what in the standard disallows the following?
>  
> program test
> integer, save, target :: C[*]
> integer, pointer :: P => C[3]
> end
>  
> Shouldn't there be a constraint "An initial-data-target shall not be a
coindexed object"?
>  
> I looked through interpretations and saw no discussion of this. Interp
fodder?
>  

Bill Long
longb at cray.com
Fortran Technical Support  &                                  voice:
651-605-9024
Bioinformatics Software Development                     fax:  651-605-9142
Cray Inc./ Cray Plaza, Suite 210/ 380 Jackson St./ St. Paul, MN 55101


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