#include "mpi.h"
int MPI_Type_get_envelope(
        MPI_Datatype datatype, 
        int *num_integers, 
        int *num_addresses, 
        int *num_datatypes, 
        int *combiner)
| num_integers | number of input integers used in the call constructing combiner (nonnegative integer) | |
| num_addresses | number of input addresses used in the call constructing combiner (nonnegative integer) | |
| num_datatypes | number of input datatypes used in the call constructing combiner (nonnegative integer) | |
| combiner | combiner (state) | 
All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER in Fortran.
Location:type_get_env.c