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

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2014-2017, Oracle and/or its affiliates.
   4
   5 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
   6 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
   7
   8 // Licensed under the Boost Software License version 1.0.
   9 // http://www.boost.org/users/license.html
  10
  11 #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_SIMPLE_ALWAYS_SIMPLE_HPP
  12 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_SIMPLE_ALWAYS_SIMPLE_HPP
  13
  14 #include <boost/geometry/core/tags.hpp>
  15
  16 #include <boost/geometry/algorithms/dispatch/is_simple.hpp>
  17
  18
  19 namespace boost { namespace geometry
  20 {
  21
  22
  23 #ifndef DOXYGEN_NO_DETAIL
  24 namespace detail { namespace is_simple
  25 {
  26
  27
  28 template <typename Geometry>
  29 struct always_simple
  30 {
  31     template <typename Strategy>
  32     static inline bool apply(Geometry const&, Strategy const&)
  33     {
  34         return true;
  35     }
  36 };
  37
  38
  39 }} // namespace detail::is_simple
  40 #endif // DOXYGEN_NO_DETAIL
  41
  42
  43
  44
  45 #ifndef DOXYGEN_NO_DISPATCH
  46 namespace dispatch
  47 {
  48
  49
  50 // A point is always simple
  51 template <typename Point>
  52 struct is_simple<Point, point_tag>
  53     : detail::is_simple::always_simple<Point>
  54 {};
  55
  56
  57 // A valid segment is always simple.
  58 // A segment is a curve.
  59 // A curve is simple if it does not pass through the same point twice,
  60 // with the possible exception of its two endpoints
  61 //
  62 // Reference: OGC 06-103r4 (6.1.6.1)
  63 template <typename Segment>
  64 struct is_simple<Segment, segment_tag>
  65     : detail::is_simple::always_simple<Segment>
  66 {};
  67
  68
  69 // A valid box is always simple
  70 // A box is a Polygon, and it satisfies the conditions for Polygon validity.
  71 //
  72 // Reference (for polygon validity): OGC 06-103r4 (6.1.11.1)
  73 template <typename Box>
  74 struct is_simple<Box, box_tag>
  75     : detail::is_simple::always_simple<Box>
  76 {};
  77
  78
  79 } // namespace dispatch
  80 #endif // DOXYGEN_NO_DISPATCH
  81
  82
  83 }} // namespace boost::geometry
  84
  85 #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_SIMPLE_ALWAYS_SIMPLE_HPP