//=======================================================================

// Copyright 2002 Indiana University.

// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek

//

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

//=======================================================================

#ifndef BOOST_GRAPH_SELECTORS_HPP

#define BOOST_GRAPH_SELECTORS_HPP

namespace boost {

  //===========================================================================

  // Selectors for the Directed template parameter of adjacency_list

  // and adjacency_matrix.

  struct directedS { enum { is_directed = true, is_bidir = false }; 

    typedef true_type is_directed_t; 

    typedef false_type is_bidir_t;

  };

  struct undirectedS { 

    enum { is_directed = false, is_bidir = false }; 

    typedef false_type is_directed_t;

    typedef false_type is_bidir_t;

  };

  struct bidirectionalS { 

    enum { is_directed = true, is_bidir = true }; 

    typedef true_type is_directed_t;

    typedef true_type is_bidir_t;

  };

} // namespace boost

#endif // BOOST_GRAPH_SELECTORS_HPP