1 files changed, 33 insertions, 0 deletions
diff --git a/boost/geometry/algorithms/detail/buffer/parallel_continue.hpp b/boost/geometry/algorithms/detail/buffer/parallel_continue.hpp
new file mode 100644
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+++ b/boost/geometry/algorithms/detail/buffer/parallel_continue.hpp
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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2012-2014 Barend Gehrels, Amsterdam, the Netherlands.
+
+// 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_BUFFER_PARALLEL_CONTINUE_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_BUFFER_PARALLEL_CONTINUE_HPP
+
+
+namespace boost { namespace geometry
+{
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace detail { namespace buffer
+{
+
+template <typename T>
+inline bool parallel_continue(T dx1, T dy1, T dx2, T dy2)
+{
+    T const dot = dx1 * dx2 + dy1 * dy2;
+    return dot > 0;
+}
+
+}} // namespace detail::buffer
+#endif // DOXYGEN_NO_DETAIL
+
+
+}} // namespace boost::geometry
+
+#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_BUFFER_PARALLEL_CONTINUE_HPP