Imported Upstream version 1.58.0upstream/1.58.0

Change-Id: If0072143aa26874812e0db6872e1efb10a3e5e94
Signed-off-by: DongHun Kwak <dh0128.kwak@samsung.com>

1 files changed, 69 insertions, 0 deletions

diff --git a/boost/geometry/algorithms/detail/flattening.hpp b/boost/geometry/algorithms/detail/flattening.hpp
new file mode 100644
index 0000000000..8ed5fd9a89
--- /dev/null
+++ b/boost/geometry/algorithms/detail/flattening.hpp
@@ -0,0 +1,69 @@
+// Boost.Geometry
+
+// Copyright (c) 2014 Oracle and/or its affiliates.
+
+// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
+
+// Use, modification and distribution is subject to 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_FLATTENING_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_FLATTENING_HPP
+
+#include <boost/geometry/core/radius.hpp>
+#include <boost/geometry/core/tag.hpp>
+#include <boost/geometry/core/tags.hpp>
+
+#include <boost/geometry/algorithms/not_implemented.hpp>
+
+namespace boost { namespace geometry
+{
+
+#ifndef DOXYGEN_NO_DISPATCH
+namespace detail_dispatch
+{
+
+template <typename ResultType, typename Geometry, typename Tag = typename tag<Geometry>::type>
+struct flattening
+    : not_implemented<Tag>
+{};
+
+template <typename ResultType, typename Geometry>
+struct flattening<ResultType, Geometry, srs_sphere_tag>
+{
+    static inline ResultType apply(Geometry const& /*geometry*/)
+    {
+        return ResultType(0);
+    }
+};
+
+template <typename ResultType, typename Geometry>
+struct flattening<ResultType, Geometry, srs_spheroid_tag>
+{
+    static inline ResultType apply(Geometry const& geometry)
+    {
+        return ResultType(get_radius<0>(geometry) - get_radius<2>(geometry))
+                    / ResultType(get_radius<0>(geometry));
+    }
+};
+
+} // namespace detail_dispatch
+#endif // DOXYGEN_NO_DISPATCH
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace detail
+{
+
+template <typename ResultType, typename Geometry>
+ResultType flattening(Geometry const& geometry)
+{
+    return detail_dispatch::flattening<ResultType, Geometry>::apply(geometry);
+}
+
+} // namespace detail
+#endif // DOXYGEN_NO_DETAIL
+
+}} // namespace boost::geometry
+
+#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_FLATTENING_HPP