ceph/src/boost/libs/geometry/include/boost/geometry/algorithms/detail/as_range.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
   4 // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
   5 // Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
   6
   7 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
   8 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
   9
  10 // Use, modification and distribution is subject to the Boost Software License,
  11 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  12 // http://www.boost.org/LICENSE_1_0.txt)
  13
  14 #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_AS_RANGE_HPP
  15 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_AS_RANGE_HPP
  16
  17
  18 #include <boost/geometry/core/exterior_ring.hpp>
  19 #include <boost/geometry/core/tag.hpp>
  20 #include <boost/geometry/core/tags.hpp>
  21
  22 #include <boost/geometry/util/add_const_if_c.hpp>
  23
  24
  25 namespace boost { namespace geometry
  26 {
  27
  28
  29 #ifndef DOXYGEN_NO_DISPATCH
  30 namespace dispatch
  31 {
  32
  33
  34 template <typename GeometryTag, typename Geometry, typename Range, bool IsConst>
  35 struct as_range
  36 {
  37     static inline typename add_const_if_c<IsConst, Range>::type& get(
  38             typename add_const_if_c<IsConst, Geometry>::type& input)
  39     {
  40         return input;
  41     }
  42 };
  43
  44
  45 template <typename Geometry, typename Range, bool IsConst>
  46 struct as_range<polygon_tag, Geometry, Range, IsConst>
  47 {
  48     static inline typename add_const_if_c<IsConst, Range>::type& get(
  49             typename add_const_if_c<IsConst, Geometry>::type& input)
  50     {
  51         return exterior_ring(input);
  52     }
  53 };
  54
  55
  56 } // namespace dispatch
  57 #endif // DOXYGEN_NO_DISPATCH
  58
  59 // Will probably be replaced by the more generic "view_as", therefore in detail
  60 namespace detail
  61 {
  62
  63 /*!
  64 \brief Function getting either the range (ring, linestring) itself
  65 or the outer ring (polygon)
  66 \details Utility to handle polygon's outer ring as a range
  67 \ingroup utility
  68 */
  69 template <typename Range, typename Geometry>
  70 inline Range& as_range(Geometry& input)
  71 {
  72     return dispatch::as_range
  73         <
  74             typename tag<Geometry>::type,
  75             Geometry,
  76             Range,
  77             false
  78         >::get(input);
  79 }
  80
  81
  82 /*!
  83 \brief Function getting either the range (ring, linestring) itself
  84 or the outer ring (polygon), const version
  85 \details Utility to handle polygon's outer ring as a range
  86 \ingroup utility
  87 */
  88 template <typename Range, typename Geometry>
  89 inline Range const& as_range(Geometry const& input)
  90 {
  91     return dispatch::as_range
  92         <
  93             typename tag<Geometry>::type,
  94             Geometry,
  95             Range,
  96             true
  97         >::get(input);
  98 }
  99
 100 }
 101
 102 }} // namespace boost::geometry
 103
 104
 105 #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_AS_RANGE_HPP