ceph/src/boost/libs/geometry/include/boost/geometry/algorithms/detail/get_max_size.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2014 Barend Gehrels, Amsterdam, the Netherlands.
   4 // Copyright (c) 2014 Bruno Lalande, Paris, France.
   5 // Copyright (c) 2014 Mateusz Loskot, London, UK.
   6 // Copyright (c) 2014 Adam Wulkiewicz, Lodz, Poland.
   7
   8 // Use, modification and distribution is subject to the Boost Software License,
   9 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  10 // http://www.boost.org/LICENSE_1_0.txt)
  11
  12 #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_GET_MAX_SIZE_HPP
  13 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_GET_MAX_SIZE_HPP
  14
  15
  16 #include <cstddef>
  17
  18 #include <boost/geometry/core/access.hpp>
  19 #include <boost/geometry/util/math.hpp>
  20
  21 namespace boost { namespace geometry
  22 {
  23
  24 #ifndef DOXYGEN_NO_DETAIL
  25 namespace detail
  26 {
  27
  28 template <typename Box, std::size_t Dimension>
  29 struct get_max_size_box
  30 {
  31     static inline typename coordinate_type<Box>::type apply(Box const& box)
  32     {
  33         typename coordinate_type<Box>::type s
  34             = geometry::math::abs(geometry::get<1, Dimension>(box) - geometry::get<0, Dimension>(box));
  35
  36         return (std::max)(s, get_max_size_box<Box, Dimension - 1>::apply(box));
  37     }
  38 };
  39
  40 template <typename Box>
  41 struct get_max_size_box<Box, 0>
  42 {
  43     static inline typename coordinate_type<Box>::type apply(Box const& box)
  44     {
  45         return geometry::math::abs(geometry::get<1, 0>(box) - geometry::get<0, 0>(box));
  46     }
  47 };
  48
  49 // This might be implemented later on for other geometries too.
  50 // Not dispatched yet.
  51 template <typename Box>
  52 inline typename coordinate_type<Box>::type get_max_size(Box const& box)
  53 {
  54     return get_max_size_box<Box, dimension<Box>::value - 1>::apply(box);
  55 }
  56
  57 } // namespace detail
  58 #endif // DOXYGEN_NO_DETAIL
  59
  60
  61 }} // namespace boost::geometry
  62
  63
  64 #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_GET_MAX_SIZE_HPP