ceph/src/boost/boost/geometry/strategies/default_length_result.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands.
   4 // Copyright (c) 2008-2014 Bruno Lalande, Paris, France.
   5 // Copyright (c) 2009-2014 Mateusz Loskot, London, UK.
   6
   7 // This file was modified by Oracle on 2014-2021.
   8 // Modifications copyright (c) 2014-2021, Oracle and/or its affiliates.
   9 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
  10 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
  11
  12 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
  13 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
  14
  15 // Use, modification and distribution is subject to the Boost Software License,
  16 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  17 // http://www.boost.org/LICENSE_1_0.txt)
  18
  19 #ifndef BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP
  20 #define BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP
  21
  22
  23 #include <boost/geometry/algorithms/detail/select_geometry_type.hpp>
  24 #include <boost/geometry/core/coordinate_type.hpp>
  25 #include <boost/geometry/util/select_most_precise.hpp>
  26 #include <boost/geometry/util/type_traits.hpp>
  27
  28
  29 namespace boost { namespace geometry
  30 {
  31
  32
  33 namespace resolve_strategy
  34 {
  35
  36 // NOTE: The implementation was simplified greately preserving the old
  37 //   behavior. In general case the result types of Strategies should be
  38 //   taken into account.
  39 // It would probably be enough to use distance_result and
  40 //   default_distance_result here.
  41
  42 } // namespace resolve_strategy
  43
  44
  45 namespace resolve_dynamic
  46 {
  47
  48 template <typename Sequence>
  49 struct default_length_result_impl;
  50
  51 template <typename ...Geometries>
  52 struct default_length_result_impl<util::type_sequence<Geometries...>>
  53 {
  54     using type = typename select_most_precise
  55         <
  56             typename coordinate_type<Geometries>::type...,
  57             long double
  58         >::type;
  59 };
  60
  61 template <typename Geometry>
  62 struct default_length_result
  63     : default_length_result_impl<typename detail::geometry_types<Geometry>::type>
  64 {};
  65
  66
  67 } // namespace resolve_dynamic
  68
  69
  70 /*!
  71     \brief Meta-function defining return type of length function
  72     \ingroup length
  73     \note Length of a line of integer coordinates can be double.
  74         So we take at least a double. If Big Number types are used,
  75         we take that type.
  76
  77  */
  78 template <typename Geometry>
  79 struct default_length_result
  80     : resolve_dynamic::default_length_result<Geometry>
  81 {};
  82
  83
  84 }} // namespace boost::geometry
  85
  86 #endif // BOOST_GEOMETRY_STRATEGIES_DEFAULT_LENGTH_RESULT_HPP