ceph/src/boost/boost/geometry/strategies/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 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
   9 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
  10
  11 // Use, modification and distribution is subject to the Boost Software License,
  12 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  13 // http://www.boost.org/LICENSE_1_0.txt)
  14
  15 #ifndef BOOST_GEOMETRY_STRATEGIES_AREA_HPP
  16 #define BOOST_GEOMETRY_STRATEGIES_AREA_HPP
  17
  18
  19 #include <boost/geometry/core/coordinate_type.hpp>
  20 #include <boost/geometry/util/select_most_precise.hpp>
  21
  22 #include <boost/mpl/assert.hpp>
  23
  24
  25 namespace boost { namespace geometry
  26 {
  27
  28
  29 namespace strategy { namespace area
  30 {
  31
  32
  33 #ifndef DOXYGEN_NO_DETAIL
  34 namespace detail
  35 {
  36
  37 // If user specified a CalculationType, use that type, whatever it is
  38 //   and whatever the Geometry is.
  39 // Else, use Geometry's coordinate-type promoted to double if needed.
  40 template
  41 <
  42     typename Geometry,
  43     typename CalculationType
  44 >
  45 struct result_type
  46 {
  47     typedef CalculationType type;
  48 };
  49
  50 template
  51 <
  52     typename Geometry
  53 >
  54 struct result_type<Geometry, void>
  55     : select_most_precise
  56         <
  57             typename coordinate_type<Geometry>::type,
  58             double
  59         >
  60 {};
  61
  62 } // namespace detail
  63 #endif // DOXYGEN_NO_DETAIL
  64
  65
  66 namespace services
  67 {
  68
  69 /*!
  70     \brief Traits class binding a default area strategy to a coordinate system
  71     \ingroup area
  72     \tparam Tag tag of coordinate system
  73 */
  74 template <typename Tag>
  75 struct default_strategy
  76 {
  77     BOOST_MPL_ASSERT_MSG
  78         (
  79             false, NOT_IMPLEMENTED_FOR_THIS_COORDINATE_SYSTEM
  80             , (types<Tag>)
  81         );
  82 };
  83
  84
  85 } // namespace services
  86
  87 }} // namespace strategy::area
  88
  89
  90 }} // namespace boost::geometry
  91
  92 #endif // BOOST_GEOMETRY_STRATEGIES_AREA_HPP