boost/graph/graph_selectors.hpp

   1 //=======================================================================
   2 // Copyright 2002 Indiana University.
   3 // Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
   4 //
   5 // Distributed under the Boost Software License, Version 1.0. (See
   6 // accompanying file LICENSE_1_0.txt or copy at
   7 // http://www.boost.org/LICENSE_1_0.txt)
   8 //=======================================================================
   9
  10 #ifndef BOOST_GRAPH_SELECTORS_HPP
  11 #define BOOST_GRAPH_SELECTORS_HPP
  12
  13 #include <boost/mpl/bool.hpp>
  14
  15 namespace boost {
  16
  17   //===========================================================================
  18   // Selectors for the Directed template parameter of adjacency_list
  19   // and adjacency_matrix.
  20
  21   struct directedS { enum { is_directed = true, is_bidir = false };
  22     typedef mpl::true_ is_directed_t;
  23     typedef mpl::false_ is_bidir_t;
  24   };
  25   struct undirectedS {
  26     enum { is_directed = false, is_bidir = false };
  27     typedef mpl::false_ is_directed_t;
  28     typedef mpl::false_ is_bidir_t;
  29   };
  30   struct bidirectionalS {
  31     enum { is_directed = true, is_bidir = true };
  32     typedef mpl::true_ is_directed_t;
  33     typedef mpl::true_ is_bidir_t;
  34   };
  35
  36 } // namespace boost
  37
  38 #endif // BOOST_GRAPH_SELECTORS_HPP