Python: cleaner boost dependency

python/external/boost/boost/graph/graph_selectors.hpp

@@ -0,0 +1,38 @@
+//=======================================================================
+// 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
+
+#include <boost/mpl/bool.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 mpl::true_ is_directed_t; 
+    typedef mpl::false_ is_bidir_t;
+  };
+  struct undirectedS { 
+    enum { is_directed = false, is_bidir = false }; 
+    typedef mpl::false_ is_directed_t;
+    typedef mpl::false_ is_bidir_t;
+  };
+  struct bidirectionalS { 
+    enum { is_directed = true, is_bidir = true }; 
+    typedef mpl::true_ is_directed_t;
+    typedef mpl::true_ is_bidir_t;
+  };
+
+} // namespace boost
+
+#endif // BOOST_GRAPH_SELECTORS_HPP