Advice to users. The MPI_UB and MPI_LB markers are not given by
these calls...
I'm sorry I wasn't at the October meeting, but I'm wondering if someone
might shed some light on the discussion that led to this advice to
users.
It was my intent when I proposed this function that the MPI_UB and
MPI_LB markers *be given by these calls*. That they be considered basic
types; that they be returned by MPI_Type_contents in sequence as they
were originally passed to MPI_Type_struct; and that when passed to
MPI_Type_envelope, it return the constant MPI_BASIC.
When implementing an earlier version of the specification of these
calls, I made them behave as I described above. To me it seemed the
natural thing to do and it still feels natural to me. I'm curious as to
the reason for the advice to users -- to me it makes the functions both
harder to implement and harder to use.