[Mpi-forum] MPI_UNDEFINED

[Jeff Squyres]

Is this a "minor" issue such that it could be done in 1 reading, or should I do a proper ticket + formal reading + 2 votes?

(either is fine with me; I'm just asking for clarification)


On Feb 4, 2011, at 3:07 PM, William Gropp wrote:

> 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
> 
> 
> 
> 
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-- 
Jeff Squyres
jsquyres at cisco.com
For corporate legal information go to:
http://www.cisco.com/web/about/doing_business/legal/cri/