ceph/src/boost/boost/geometry/algorithms/detail/buffer/buffer_box.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2018-2019 Barend Gehrels, Amsterdam, the Netherlands.
   4
   5 // Use, modification and distribution is subject to the Boost Software License,
   6 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   7 // http://www.boost.org/LICENSE_1_0.txt)
   8
   9 #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_BUFFER_BUFFER_BOX_HPP
  10 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_BUFFER_BUFFER_BOX_HPP
  11
  12 #include <cstddef>
  13
  14 #include <boost/geometry/core/coordinate_dimension.hpp>
  15 #include <boost/geometry/core/coordinate_type.hpp>
  16 #include <boost/geometry/core/access.hpp>
  17
  18
  19 namespace boost { namespace geometry
  20 {
  21
  22 #ifndef DOXYGEN_NO_DETAIL
  23 namespace detail { namespace buffer
  24 {
  25
  26 template <typename BoxIn, typename BoxOut, typename T, std::size_t C, std::size_t D, std::size_t N>
  27 struct box_loop
  28 {
  29     typedef typename coordinate_type<BoxOut>::type coordinate_type;
  30
  31     static inline void apply(BoxIn const& box_in, T const& distance, BoxOut& box_out)
  32     {
  33         coordinate_type d = distance;
  34         set<C, D>(box_out, get<C, D>(box_in) + d);
  35         box_loop<BoxIn, BoxOut, T, C, D + 1, N>::apply(box_in, distance, box_out);
  36     }
  37 };
  38
  39 template <typename BoxIn, typename BoxOut, typename T, std::size_t C, std::size_t N>
  40 struct box_loop<BoxIn, BoxOut, T, C, N, N>
  41 {
  42     static inline void apply(BoxIn const&, T const&, BoxOut&) {}
  43 };
  44
  45 // Extends a box with the same amount in all directions
  46 template<typename BoxIn, typename BoxOut, typename T>
  47 inline void buffer_box(BoxIn const& box_in, T const& distance, BoxOut& box_out)
  48 {
  49     assert_dimension_equal<BoxIn, BoxOut>();
  50
  51     static const std::size_t N = dimension<BoxIn>::value;
  52
  53     box_loop<BoxIn, BoxOut, T, min_corner, 0, N>::apply(box_in, -distance, box_out);
  54     box_loop<BoxIn, BoxOut, T, max_corner, 0, N>::apply(box_in, distance, box_out);
  55 }
  56
  57 }} // namespace detail::buffer
  58 #endif // DOXYGEN_NO_DETAIL
  59
  60 }} // namespace boost::geometry
  61
  62 #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_BUFFER_BUFFER_BOX_HPP