[MPIWG Fortran] F08 and pair types?

[Rolf Rabenseifner]

I'm sorry, but I expect that deprecation of a language binding
is not possible for a feature that is still valid in other languages (here C).

This means, that MINLOC and MAXLOC are as they are defined
and there is no reason to deprecate them.
They are not wrong and nobody want to pay the maintenance costs
for modifying existing applications that use MIN/MAXLOC.

The only way to do it better, is to add a new feature, e.g.,
MINLOC_F08 and MAXLOC_F08 which is valid only for the new
mpi_f08 module. 

Rolf

----- Original Message -----
> From: "Craig Rasmussen" <rasmus at cas.uoregon.edu>
> To: "MPI-WG Fortran working group" <mpiwg-fortran at lists.mpi-forum.org>
> Sent: Tuesday, December 8, 2015 6:30:37 PM
> Subject: Re: [MPIWG Fortran] F08 and pair types?

> The old stuff could be deprecated because all existing compilers that I know of
> support user-defined types. I assume that "deprecated" means that it still
> exists in libraries for legacy apps but is no longer really defined in the
> standard.
> 
> -craig
> 
> On Tue, Dec 8, 2015 at 9:19 AM, Craig Rasmusen < rasmus at cas.uoregon.edu > wrote:
> 
> 
> 
> Fortran is a modern language? Wut...
> 
> Actually seems like a simple and good change. For example, could define:
> 
> MPI_REAL_INT and MPI_INTEGER_INT
> 
> However, I'm not sure what would be in the structs (user-defined types). I'll
> have to ask Squyres what the text following
> 
> "The datatype MPI_FLOAT_INT is as if defined by the following sequence of
> instructions"
> 
> means.
> 
> -craig
> 
> On Mon, Dec 7, 2015 at 4:20 PM, Jeff Hammond < jeff.science at gmail.com > wrote:
> 
> 
> 
> I have a reasonable understanding of why the legacy Fortran bindings use 2REAL,
> 2DOUBLE_PRECISION and 2INTEGER with {MAX,MIN}LOC reductions.
> 
> Doesn't modern Fortran provide a way to create struct-like things along the
> lines of C, such that more appropriate pair types could be used for these?
> 
> The relevant text is section 5.9.4 of MPI 3.1.
> 
> Jeff
> 
> --
> Jeff Hammond
> jeff.science at gmail.com
> http://jeffhammond.github.io/
> 
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-- 
Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner at hlrs.de
High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530
University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832
Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner
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