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+// Boost.Geometry
+
+// Copyright (c) 2015, Oracle and/or its affiliates.
+
+// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
+
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_EXPAND_EXPAND_BY_EPSILON_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_EXPAND_EXPAND_BY_EPSILON_HPP
+
+#include <cstddef>
+#include <algorithm>
+
+#include <boost/type_traits/is_floating_point.hpp>
+
+#include <boost/geometry/core/access.hpp>
+#include <boost/geometry/core/coordinate_dimension.hpp>
+#include <boost/geometry/core/coordinate_type.hpp>
+
+#include <boost/geometry/util/math.hpp>
+
+#include <boost/geometry/views/detail/indexed_point_view.hpp>
+
+namespace boost { namespace geometry
+{
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace detail { namespace expand
+{
+
+template
+<
+ typename Point,
+ template <typename> class PlusOrMinus,
+ std::size_t I = 0,
+ std::size_t D = dimension<Point>::value,
+ bool Enable = boost::is_floating_point
+ <
+ typename coordinate_type<Point>::type
+ >::value
+>
+struct corner_by_epsilon
+{
+ static inline void apply(Point & point)
+ {
+ typedef typename coordinate_type<Point>::type coord_type;
+ coord_type const coord = get<I>(point);
+ coord_type const eps = math::scaled_epsilon(coord);
+
+ set<I>(point, PlusOrMinus<coord_type>()(coord, eps));
+
+ corner_by_epsilon<Point, PlusOrMinus, I+1>::apply(point);
+ }
+};
+
+template
+<
+ typename Point,
+ template <typename> class PlusOrMinus,
+ std::size_t I,
+ std::size_t D
+>
+struct corner_by_epsilon<Point, PlusOrMinus, I, D, false>
+{
+ static inline void apply(Point const&) {}
+};
+
+template
+<
+ typename Point,
+ template <typename> class PlusOrMinus,
+ std::size_t D,
+ bool Enable
+>
+struct corner_by_epsilon<Point, PlusOrMinus, D, D, Enable>
+{
+ static inline void apply(Point const&) {}
+};
+
+template
+<
+ typename Point,
+ template <typename> class PlusOrMinus,
+ std::size_t D
+>
+struct corner_by_epsilon<Point, PlusOrMinus, D, D, false>
+{
+ static inline void apply(Point const&) {}
+};
+
+} // namespace expand
+
+template <typename Box>
+inline void expand_by_epsilon(Box & box)
+{
+ typedef detail::indexed_point_view<Box, min_corner> min_type;
+ min_type min_point(box);
+ expand::corner_by_epsilon<min_type, std::minus>::apply(min_point);
+
+ typedef detail::indexed_point_view<Box, max_corner> max_type;
+ max_type max_point(box);
+ expand::corner_by_epsilon<max_type, std::plus>::apply(max_point);
+}
+
+} // namespace detail
+#endif // DOXYGEN_NO_DETAIL
+
+}} // namespace boost::geometry
+
+#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_EXPAND_EXPAND_BY_EPSILON_HPP