-SMPI_F2C_C2F(MPI_Comm, comm)
-SMPI_F2C_C2F(MPI_Group, group)
-SMPI_F2C_C2F(MPI_Request, request)
-SMPI_F2C_C2F(MPI_Datatype, type)
-SMPI_F2C_C2F(MPI_Win, win)
-SMPI_F2C_C2F(MPI_Op, op)
-SMPI_F2C_C2F(MPI_Info, info)
+SMPI_F2C_C2F(MPI_Comm, comm, MPI_COMM_NULL)
+SMPI_F2C_C2F(MPI_Group, group, MPI_GROUP_NULL)
+SMPI_F2C_C2F(MPI_Request, request, MPI_REQUEST_NULL)
+SMPI_F2C_C2F(MPI_Datatype, type, MPI_DATATYPE_NULL)
+SMPI_F2C_C2F(MPI_Win, win, MPI_WIN_NULL)
+SMPI_F2C_C2F(MPI_Op, op, MPI_OP_NULL)
+SMPI_F2C_C2F(MPI_Info, info, MPI_INFO_NULL)