/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *

 *  (C) 2003 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <stdio.h>

#include "mpitest.h"

/*

static char MTEST_Descrip[] = "Create a communicator with a graph that contains no processes";

*/

int main(int argc, char *argv[])

{

    int errs = 0;

    int *index = 0, *edges = 0;

    MPI_Comm comm;

    MTest_Init(&argc, &argv);

    /* MPI 2.1, page 246, lines 29-30 make it clear that this is a valid

     * (not erroneous) call that must return MPI_COMM_NULL */

    MPI_Graph_create(MPI_COMM_WORLD, 0, index, edges, 0, &comm);

    if (comm != MPI_COMM_NULL) {

        errs++;

        fprintf(stderr, "Expected MPI_COMM_NULL from empty graph create\n");

    }

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}