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

Jeff Squyres jsquyres at cisco.com
Tue Jun 26 11:19:57 CDT 2012

On Jun 26, 2012, at 12:14 PM, Jed Brown wrote:

> 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.

I'd have to see the exact changes to get a better feel for it, but I would be a little surprised if these changes could be considered ticket 0, for two reasons:

1. "ticket 0" is reserved for typos or other insignificant changes that do not change the meaning of the standard.  Indeed, the standard would still be fine without those ticket 0 changes -- the idea is that ticket 0 changes make the standard read better, etc.

2. Adding MPI datatypes for uin64_t (and friends) was a standalone ticket.  I would think that this would be very similar.

Jeff Squyres
jsquyres at cisco.com
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