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Don't fail environmental check if README.md exists (but .txt and no-suffix don't)

// Copyright 2004, 2005 The Trustees of Indiana University.

// Use, modification and distribution is subject to 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)

//  Authors: Douglas Gregor
//           Andrew Lumsdaine
#ifndef BOOST_GRAPH_POINT_TRAITS_HPP
#define BOOST_GRAPH_POINT_TRAITS_HPP

namespace boost { namespace graph {

template<typename Point>
struct point_traits
{
  // The type of each component of the point
  typedef typename Point::component_type component_type;

  // The number of dimensions in the point
  static std::size_t dimensions(const Point& point);
};

} } // end namespace boost::graph

#endif // BOOST_GRAPH_POINT_TRAITS_HPP