On Jul 17, 2008, at 10:03 AM, William Gropp wrote:

To make this perfectly clear, should the standard state that the values of the predefined datatypes from another language are exactly the same as the value produced by the handle conversion function? E.g., in Fortran, the value of MPI_INT is what you would get from MPI_TYPE_C2F( MPI_INT ) (where MPI_INT is the C version). It should also state that just because Fortran defines MPI_LONG_LONG, that does not imply that Fortran support an integer type that corresponds to the C long long type.

I think I agree with the idea (you can use MPI_INT in Fortran just like you would use MPI_INT in C just like you would use MPI::INT in C+ +), but your exact idea doesn't seem to work for C++. For example, what about MPI::INTEGER? I had assumed that the only use of MPI_INT in Fortran would be used for Fortran to pass a buffer to an MPI function that was pre-filled with int's in C (and other similar cases like this). Is that consistent with what you're suggesting? -- Jeff Squyres Cisco Systems