Imported Upstream version 1.64.0upstream/1.64.0

Change-Id: Id9212edd016dd55f21172c427aa7894d1d24148b
Signed-off-by: DongHun Kwak <dh0128.kwak@samsung.com>

1 files changed, 70 insertions, 0 deletions

diff --git a/boost/geometry/formulas/eccentricity_sqr.hpp b/boost/geometry/formulas/eccentricity_sqr.hpp
new file mode 100644
index 0000000000..01a9beacb9
--- /dev/null
+++ b/boost/geometry/formulas/eccentricity_sqr.hpp
@@ -0,0 +1,70 @@
+// Boost.Geometry
+
+// Copyright (c) 2016 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_FORMULAS_ECCENCRICITY_SQR_HPP
+#define BOOST_GEOMETRY_FORMULAS_ECCENCRICITY_SQR_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 formula_dispatch
+{
+
+template <typename ResultType, typename Geometry, typename Tag = typename tag<Geometry>::type>
+struct eccentricity_sqr
+    : not_implemented<Tag>
+{};
+
+template <typename ResultType, typename Geometry>
+struct eccentricity_sqr<ResultType, Geometry, srs_sphere_tag>
+{
+    static inline ResultType apply(Geometry const& /*geometry*/)
+    {
+        return ResultType(0);
+    }
+};
+
+template <typename ResultType, typename Geometry>
+struct eccentricity_sqr<ResultType, Geometry, srs_spheroid_tag>
+{
+    static inline ResultType apply(Geometry const& geometry)
+    {
+        // 1 - (b / a)^2
+        return ResultType(1) - math::sqr(ResultType(get_radius<2>(geometry))
+                                       / ResultType(get_radius<0>(geometry)));
+    }
+};
+
+} // namespace formula_dispatch
+#endif // DOXYGEN_NO_DISPATCH
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace formula
+{
+
+template <typename ResultType, typename Geometry>
+ResultType eccentricity_sqr(Geometry const& geometry)
+{
+    return formula_dispatch::eccentricity_sqr<ResultType, Geometry>::apply(geometry);
+}
+
+} // namespace formula
+#endif // DOXYGEN_NO_DETAIL
+
+}} // namespace boost::geometry
+
+#endif // BOOST_GEOMETRY_FORMULAS_ECCENCRICITY_SQR_HPP