[Mpi-forum] MPI_UNDEFINED

[William Gropp]

I recommend a change to the standard - I'm sure the Forum intended  
integer constants to be valid here.

Bill

On Feb 4, 2011, at 1:18 PM, Jeff Squyres wrote:

> Question about MPI_UNDEFINED (and all the constants in the top table  
> in MPI-2.2 p515): its type in C is listed as (const int) or unnamed  
> (enum).  But in Open MPI, we have this value in mpi.h as:
>
>    #define MPI_UNDEFINED          -32766
>
> So does MPICH2.
>
> A #define of an integer constant will work just fine with other  
> const int's, but it technically isn't a const int or unnamed enum.
>
> Are we wrong?  Or should I propose a ticket to change the wording of  
> this table from:
>
>    C type: const int (or unnamed enum)
>
> to
>
>    C type: const int, unnamed enum, or integer constant
>
> (the same issue doesn't exist for the C++ constants -- even though  
> the point is moot with them, since they're deprecated -- because  
> they're in the MPI:: namespace, and therefore really should be const  
> int's or unnamed enum's)
>
> -- 
> Jeff Squyres
> jsquyres at cisco.com
> For corporate legal information go to:
> http://www.cisco.com/web/about/doing_business/legal/cri/
>
>
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William Gropp
Deputy Director for Research
Institute for Advanced Computing Applications and Technologies
Paul and Cynthia Saylor Professor of Computer Science
University of Illinois Urbana-Champaign