ceph/src/boost/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 // This file was modified by Oracle on 2020.
   8 // Modifications copyright (c) 2020 Oracle and/or its affiliates.
   9 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
  10
  11 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
  12 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
  13
  14 // Use, modification and distribution is subject to the Boost Software License,
  15 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  16 // http://www.boost.org/LICENSE_1_0.txt)
  17
  18 #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_AS_RANGE_HPP
  19 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_AS_RANGE_HPP
  20
  21
  22 #include <boost/geometry/core/exterior_ring.hpp>
  23 #include <boost/geometry/core/tag.hpp>
  24 #include <boost/geometry/core/tags.hpp>
  25
  26
  27 namespace boost { namespace geometry
  28 {
  29
  30
  31 #ifndef DOXYGEN_NO_DISPATCH
  32 namespace dispatch
  33 {
  34
  35
  36 template <typename GeometryTag, typename Geometry, typename Range>
  37 struct as_range
  38 {
  39     static inline Range& get(Geometry& input)
  40     {
  41         return input;
  42     }
  43 };
  44
  45
  46 template <typename Geometry, typename Range>
  47 struct as_range<polygon_tag, Geometry, Range>
  48 {
  49     static inline Range& get(Geometry& 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         >::get(input);
  78 }
  79
  80
  81 /*!
  82 \brief Function getting either the range (ring, linestring) itself
  83 or the outer ring (polygon), const version
  84 \details Utility to handle polygon's outer ring as a range
  85 \ingroup utility
  86 */
  87 template <typename Range, typename Geometry>
  88 inline Range const& as_range(Geometry const& input)
  89 {
  90     return dispatch::as_range
  91         <
  92             typename tag<Geometry>::type,
  93             Geometry const,
  94             Range const
  95         >::get(input);
  96 }
  97
  98 }
  99
 100 }} // namespace boost::geometry
 101
 102
 103 #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_AS_RANGE_HPP