ceph/src/boost/libs/geometry/include/boost/geometry/algorithms/detail/is_simple/always_simple.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2014, Oracle and/or its affiliates.
   4
   5 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
   6
   7 // Licensed under the Boost Software License version 1.0.
   8 // http://www.boost.org/users/license.html
   9
  10 #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_SIMPLE_ALWAYS_SIMPLE_HPP
  11 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_SIMPLE_ALWAYS_SIMPLE_HPP
  12
  13 #include <boost/geometry/core/tags.hpp>
  14
  15 #include <boost/geometry/algorithms/dispatch/is_simple.hpp>
  16
  17
  18 namespace boost { namespace geometry
  19 {
  20
  21
  22 #ifndef DOXYGEN_NO_DETAIL
  23 namespace detail { namespace is_simple
  24 {
  25
  26
  27 template <typename Geometry>
  28 struct always_simple
  29 {
  30     static inline bool apply(Geometry const&)
  31     {
  32         return true;
  33     }
  34 };
  35
  36
  37 }} // namespace detail::is_simple
  38 #endif // DOXYGEN_NO_DETAIL
  39
  40
  41
  42
  43 #ifndef DOXYGEN_NO_DISPATCH
  44 namespace dispatch
  45 {
  46
  47
  48 // A point is always simple
  49 template <typename Point>
  50 struct is_simple<Point, point_tag>
  51     : detail::is_simple::always_simple<Point>
  52 {};
  53
  54
  55 // A valid segment is always simple.
  56 // A segment is a curve.
  57 // A curve is simple if it does not pass through the same point twice,
  58 // with the possible exception of its two endpoints
  59 //
  60 // Reference: OGC 06-103r4 (6.1.6.1)
  61 template <typename Segment>
  62 struct is_simple<Segment, segment_tag>
  63     : detail::is_simple::always_simple<Segment>
  64 {};
  65
  66
  67 // A valid box is always simple
  68 // A box is a Polygon, and it satisfies the conditions for Polygon validity.
  69 //
  70 // Reference (for polygon validity): OGC 06-103r4 (6.1.11.1)
  71 template <typename Box>
  72 struct is_simple<Box, box_tag>
  73     : detail::is_simple::always_simple<Box>
  74 {};
  75
  76
  77 } // namespace dispatch
  78 #endif // DOXYGEN_NO_DISPATCH
  79
  80
  81 }} // namespace boost::geometry
  82
  83 #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_SIMPLE_ALWAYS_SIMPLE_HPP