NULL, /* pointer on extended struct*/ \
0 /* in_use counter */ \
}; \
-MPI_Datatype name = &mpi_##name;
+const MPI_Datatype name = &mpi_##name;
#define CREATE_MPI_DATATYPE_NULL(name) \
static s_smpi_mpi_datatype_t mpi_##name = { \
NULL, /* pointer on extended struct*/ \
0 /* in_use counter */ \
}; \
-MPI_Datatype name = &mpi_##name;
+const MPI_Datatype name = &mpi_##name;
//The following are datatypes for the MPI functions MPI_MAXLOC and MPI_MINLOC.
typedef struct {