#include <boost/graph/topological_sort.hpp>
#include <boost/graph/adjacency_list.hpp>
#include <boost/property_map/vector_property_map.hpp>

#include <boost/assign/list_of.hpp>
#include <boost/test/unit_test.hpp>

#include <vector>

int main()
  {
  typedef boost::adjacency_list<> G;
  typedef
    boost::graph_traits<G>::vertex_descriptor
    V;

  G g;
  std::vector<V> topology;

  boost::add_vertex(g);

  boost::topological_sort(g, std::back_inserter(topology));

  boost::assign::list_of<V>(0);
  return 0;
  }