[Mpi-forum] C++ types inaccessible after #281

Tue Jun 26 13:43:53 CDT 2012

I think the issue is just that how can a standard that does not specify how
C++ fits into things (after ticket 281) then go on to define a data type in
terms of C++ types? If there is a need for a C (not C++) complex datatype,
that should be a new proposal. But that datatype should not, in my opinion,
be defined in terms of something like std::complex. If a platform does not
support something like C99 complex types, then it will have to implement
complex types and ops itself, or be incomplete.

_______________________________________________
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dougmill at us.ibm.com               Douglas Miller/Rochester/IBM

             Jeff Hammond                                                  
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                                       Re: [Mpi-forum] C++ types           
             06/26/2012 12:21          inaccessible after #281             
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as far as i'm concerned, these types are only valid with the C bindings
when a C++ compiler is used.  does that solve it?

jeff

On Tue, Jun 26, 2012 at 11:41 AM, Douglas Miller <dougmill at us.ibm.com>
wrote:
  I've got to raise a concern here. If we start defining MPI datatypes to
  be C++ types then how will an implementation support that with only a C
  compiler? I thought the point of 281 was to eradicate C++ from the
  standard (and start over later if C++ was to be defined in the standard).

  _______________________________________________
  Douglas Miller                  BlueGene Messaging Development
  IBM Corp., Rochester, MN USA                     Bldg 030-2 A401
  dougmill at us.ibm.com               Douglas Miller/Rochester/IBM

  Inactive hide details for Jed Brown ---06/26/2012 11:26:16 AM---Jed Brown
  <jedbrown at mcs.anl.gov>Jed Brown ---06/26/2012 11:26:16 AM---Jed Brown <
  jedbrown at mcs.anl.gov>

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                                                      Re: [Mpi-forum] C++  
                                                      types inaccessible   
                                                      after #281           

  On Tue, Jun 26, 2012 at 6:13 AM, Jeff Squyres <jsquyres at cisco.com> wrote:
        There are a few C++-specific datatypes for which it would be worth
        introducing new C datatypes (e.g., MPI_CXX_COMPLEX).  It's too bad
        that no one realized this until now, because this won't make the
        MPI-3 deadline.  But it could be part of MPI-3.1 or errata, or some
        such.

  Two people in offline discussions have suggested that C bindings to the
  std::complex types (I'm not aware of anything else that #281 will lose)
  might qualify as ticket 0._______________________________________________
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University of Chicago Computation Institute
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