ceph/src/boost/boost/geometry/strategy/area.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 // Copyright (c) 2017 Adam Wulkiewicz, Lodz, Poland.
   7
   8 // This file was modified by Oracle on 2020.
   9 // Modifications copyright (c) 2020 Oracle and/or its affiliates.
  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_STRATEGY_AREA_HPP
  20 #define BOOST_GEOMETRY_STRATEGY_AREA_HPP
  21
  22
  23 #include <boost/geometry/core/coordinate_type.hpp>
  24 #include <boost/geometry/core/static_assert.hpp>
  25
  26 #include <boost/geometry/util/select_most_precise.hpp>
  27
  28
  29 namespace boost { namespace geometry
  30 {
  31
  32
  33 namespace strategy { namespace area
  34 {
  35
  36
  37 #ifndef DOXYGEN_NO_DETAIL
  38 namespace detail
  39 {
  40
  41 // If user specified a CalculationType, use that type, whatever it is
  42 //   and whatever the Geometry is.
  43 // Else, use Geometry's coordinate-type promoted to double if needed.
  44 template
  45 <
  46     typename Geometry,
  47     typename CalculationType
  48 >
  49 struct result_type
  50 {
  51     typedef CalculationType type;
  52 };
  53
  54 template
  55 <
  56     typename Geometry
  57 >
  58 struct result_type<Geometry, void>
  59     : select_most_precise
  60         <
  61             typename coordinate_type<Geometry>::type,
  62             double
  63         >
  64 {};
  65
  66 } // namespace detail
  67 #endif // DOXYGEN_NO_DETAIL
  68
  69
  70 namespace services
  71 {
  72
  73 /*!
  74     \brief Traits class binding a default area strategy to a coordinate system
  75     \ingroup area
  76     \tparam Tag tag of coordinate system
  77 */
  78 template <typename Tag>
  79 struct default_strategy
  80 {
  81     BOOST_GEOMETRY_STATIC_ASSERT_FALSE(
  82         "Not implemented for this coordinate system.",
  83         Tag);
  84 };
  85
  86
  87 } // namespace services
  88
  89 }} // namespace strategy::area
  90
  91
  92 }} // namespace boost::geometry
  93
  94 #endif // BOOST_GEOMETRY_STRATEGY_AREA_HPP