/* -*- mode: C -*-  */
/* 
   IGraph library.
   Copyright (C) 2006-2012  Gabor Csardi <csardi.gabor@gmail.com>
   334 Harvard street, Cambridge, MA 02139 USA
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc.,  51 Franklin Street, Fifth Floor, Boston, MA 
   02110-1301 USA

*/

#include <igraph.h>

int main() {

  igraph_t g1;
  igraph_vector_t v1;
  int ret;

  /* Create a graph */
  igraph_vector_init(&v1, 8);
  VECTOR(v1)[0]=0; VECTOR(v1)[1]=1;
  VECTOR(v1)[2]=1; VECTOR(v1)[3]=2;
  VECTOR(v1)[4]=2; VECTOR(v1)[5]=3;
  VECTOR(v1)[6]=2; VECTOR(v1)[7]=2;
  igraph_create(&g1, &v1, 0, 0);
  igraph_vector_destroy(&v1);

  /* Add more vertices */
  igraph_add_vertices(&g1, 10, 0);
  if (igraph_vcount(&g1) != 14) {
    return 1;
  }

  /* Add more vertices */
  igraph_add_vertices(&g1, 0, 0);
  if (igraph_vcount(&g1) != 14) {
    return 2;
  }
  
  /* Error */
  igraph_set_error_handler(igraph_error_handler_ignore);
  ret=igraph_add_vertices(&g1, -1, 0);
  if (ret != IGRAPH_EINVAL) {
    return 3;
  }
  
  igraph_destroy(&g1);

  return 0;
}