text: // Boost.Geometry (aka GGL, Generic Geometry Library)
  
  // Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands.
  
  // 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)
  
  #ifndef BOOST_GEOMETRY_MULTI_ALGORITHMS_DETAIL_OVERLAY_GET_RING_HPP
  #define BOOST_GEOMETRY_MULTI_ALGORITHMS_DETAIL_OVERLAY_GET_RING_HPP
  
  
  #include <boost/assert.hpp>
  #include <boost/range.hpp>
  
  #include <boost/geometry/algorithms/detail/overlay/get_ring.hpp>
  #include <boost/geometry/multi/core/ring_type.hpp>
  
  namespace boost { namespace geometry
  {
  
  
  #ifndef DOXYGEN_NO_DETAIL
  namespace detail { namespace overlay
  {
  
  template<>
  struct get_ring<multi_polygon_tag>
  {
      template<typename MultiPolygon>
      static inline typename ring_type<MultiPolygon>::type const& apply(
                  ring_identifier const& id,
                  MultiPolygon const& multi_polygon)
      {
          BOOST_ASSERT
              (
                  id.multi_index >= 0
                  && id.multi_index < boost::size(multi_polygon)
              );
          return get_ring<polygon_tag>::apply(id,
                      multi_polygon[id.multi_index]);
      }
  };
  
  
  
  }} // namespace detail::overlay
  #endif // DOXYGEN_NO_DETAIL
  
  
  }} // namespace boost::geometry
  
  
  #endif // BOOST_GEOMETRY_MULTI_ALGORITHMS_DETAIL_OVERLAY_GET_RING_HPP
  