[MPIWG Fortran] MPI-3 ticket 349: Fortran question

[Jeff Squyres (jsquyres)]

Sounds good to me.

Rolf -- is there any MPI reason we would not want to do this?


On Dec 11, 2013, at 4:41 PM, Bill Long <longb at cray.com> wrote:

> 
> 
> On 12/11/13 11:27 AM, Jeff Squyres (jsquyres) wrote:
>> This ticket got a formal reading today at the Forum:
>> 
>>     http://svn.mpi-forum.org/trac/mpi-forum-web/ticket/349
>>     (as of this writing, there's still a BIND(C) in there, but it will be removed shortly)
>> 
>> The function is basically intended to perform a mathematical operation.  As such, I think that the 2 Fortran bindings should be FUNCTIONs, not SUBROUTINEs (a la MPI_WTICK/MPI_WTIME).
>> 
>> Do you agree?  If so, the ticket author (Jim Dinan) is amenable to changing the Fortran bindings to the following (and I'm assuming I have the syntax below correct, but feel free to correct me if they're wrong):
>> 
> 
> Certainly it makes more sense for these to be functions in Fortran. Particularly if the programmer prefers supply an interface and call the C form directly.  If the C and Fortran versions are both functions, there is no change in the source code where the function is used.
> 
>> -----
>> INTEGER(KIND=MPI_ADDRESS_KIND) MPI_Aint_add(base, disp)
>>     INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(IN) ::  base, disp
>> 
>> INTEGER(KIND=MPI_ADDRESS_KIND) MPI_AINT_ADD(BASE, DISP)
>>     INTEGER(KIND=MPI_ADDRESS_KIND) BASE, DISP
> 
> It is certainly an oddity that the spec has two forms like this.  Any version of the Fortran standard that supports KIND= in INTEGER also supports lower case names and INTENT() attributes.   Maybe there could be some clean up of this in a future revision.
> 
> Cheers,
> Bill
> 
> 
> 
>> -----
>> 
> 
> -- 
> Bill Long                                           longb at cray.com
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> 
> 
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-- 
Jeff Squyres
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