On Jul 24, 2007, at 12:02 PM, Lisandro Dalcin wrote:
Per Lisandro's comments: I think that if you need a random/valid
value for an STL map (or similar), malloc(0) is not a good idea to
use as a key.
OK, regarding comments in this thread, you are completelly right. I am
fine with returning NULL.
BTW, should'nt this issue be commented in the standard? Perhaps in the
errata document? I think there is no a strong need to make it
implementation dependent.
MPI-2 could mandate/suggest that if size=0, the returned pointer is
NULL, but then MPI_Free_mem with a NULL pointer should succeed.
Good point. Do you want to bring it up on the mpi-21 list?
Now a question: What about Fortran ?
Hmm. Good question. I am not a Fortran expert, but my $0.02 would
be that if we can return NULL in C, and since there is no equivalent
to NULL in Fortran, then the result should be disallowed -- if you do
it, the results are undefined.
--
Jeff Squyres
Cisco Systems
