// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2018-2019 Barend Gehrels, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_BUFFER_BUFFER_BOX_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_BUFFER_BUFFER_BOX_HPP
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#include <cstddef>
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#include <boost/geometry/core/coordinate_dimension.hpp>
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#include <boost/geometry/core/coordinate_type.hpp>
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#include <boost/geometry/core/access.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail { namespace buffer
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{
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template <typename BoxIn, typename BoxOut, typename T, std::size_t C, std::size_t D, std::size_t N>
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struct box_loop
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{
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typedef typename coordinate_type<BoxOut>::type coordinate_type;
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static inline void apply(BoxIn const& box_in, T const& distance, BoxOut& box_out)
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{
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coordinate_type d = distance;
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set<C, D>(box_out, get<C, D>(box_in) + d);
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box_loop<BoxIn, BoxOut, T, C, D + 1, N>::apply(box_in, distance, box_out);
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}
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};
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template <typename BoxIn, typename BoxOut, typename T, std::size_t C, std::size_t N>
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struct box_loop<BoxIn, BoxOut, T, C, N, N>
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{
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static inline void apply(BoxIn const&, T const&, BoxOut&) {}
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};
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// Extends a box with the same amount in all directions
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template<typename BoxIn, typename BoxOut, typename T>
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inline void buffer_box(BoxIn const& box_in, T const& distance, BoxOut& box_out)
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{
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assert_dimension_equal<BoxIn, BoxOut>();
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static const std::size_t N = dimension<BoxIn>::value;
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box_loop<BoxIn, BoxOut, T, min_corner, 0, N>::apply(box_in, -distance, box_out);
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box_loop<BoxIn, BoxOut, T, max_corner, 0, N>::apply(box_in, distance, box_out);
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}
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}} // namespace detail::buffer
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#endif // DOXYGEN_NO_DETAIL
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_BUFFER_BUFFER_BOX_HPP
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