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diff --git a/boost/geometry/srs/projections/grids.hpp b/boost/geometry/srs/projections/grids.hpp
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+++ b/boost/geometry/srs/projections/grids.hpp
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+// Boost.Geometry
+
+// This file was modified by Oracle on 2018.
+// Modifications copyright (c) 2018, 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_SRS_PROJECTIONS_GRIDS_HPP
+#define BOOST_GEOMETRY_SRS_PROJECTIONS_GRIDS_HPP
+
+
+#include <boost/geometry/srs/projections/impl/pj_gridinfo.hpp>
+
+#include <fstream>
+
+
+namespace boost { namespace geometry
+{
+
+namespace srs
+{
+
+// Forward declarations for functions declarations below
+class grids;
+
+template <typename GridsStorage>
+class projection_grids;
+
+} // namespace srs
+namespace projections { namespace detail
+{
+
+// Forward declaratios of grids friends
+template <typename StreamPolicy>
+inline bool pj_gridlist_merge_gridfile(std::string const& gridname,
+                                       StreamPolicy const& stream_policy,
+                                       srs::grids & grids,
+                                       std::vector<std::size_t> & gridindexes);
+template <bool Inverse, typename CalcT, typename StreamPolicy, typename Range>
+inline bool pj_apply_gridshift_3(StreamPolicy const& stream_policy,
+                                 Range & range,
+                                 srs::grids & grids,
+                                 std::vector<std::size_t> const& gridindexes);
+
+// Forward declaratios of projection_grids friends
+template <typename Par, typename GridsStorage>
+inline void pj_gridlist_from_nadgrids(Par const& defn,
+                                      srs::projection_grids<GridsStorage> & grids);
+template <bool Inverse, typename Par, typename Range, typename Grids>
+inline bool pj_apply_gridshift_2(Par const& defn, Range & range, Grids const& grids);
+
+}} // namespace projections::detail
+
+namespace srs
+{
+
+class grids
+{
+public:
+    std::size_t size() const
+    {
+        return gridinfo.size();
+    }
+
+    bool empty() const
+    {
+        return gridinfo.empty();
+    }
+
+private:
+    template <typename StreamPolicy>
+    friend inline bool projections::detail::pj_gridlist_merge_gridfile(
+                            std::string const& gridname,
+                            StreamPolicy const& stream_policy,
+                            srs::grids & grids,
+                            std::vector<std::size_t> & gridindexes);
+    template <bool Inverse, typename CalcT, typename StreamPolicy, typename Range>
+    friend inline bool projections::detail::pj_apply_gridshift_3(
+                            StreamPolicy const& stream_policy,
+                            Range & range,
+                            srs::grids & grids,
+                            std::vector<std::size_t> const& gridindexes);
+
+    projections::detail::pj_gridinfo gridinfo;
+
+};
+
+struct ifstream_policy
+{
+    typedef std::ifstream stream_type;
+
+    static inline void open(stream_type & is, std::string const& gridname)
+    {
+        is.open(gridname.c_str(), std::ios::binary);
+    }
+};
+
+template
+<
+    typename StreamPolicy = srs::ifstream_policy,
+    typename Grids = grids
+>
+struct grids_storage
+{
+    typedef StreamPolicy stream_policy_type;
+    typedef Grids grids_type;
+
+    grids_storage()
+    {}
+
+    explicit grids_storage(stream_policy_type const& policy)
+        : stream_policy(policy)
+    {}
+
+    stream_policy_type stream_policy;
+    grids_type hgrids;
+};
+
+
+template <typename GridsStorage = grids_storage<> >
+class projection_grids
+{
+public:
+    projection_grids(GridsStorage & storage)
+        : storage_ptr(boost::addressof(storage))
+    {}
+
+    std::size_t size() const
+    {
+        return hindexes.size();
+    }
+
+    bool empty() const
+    {
+        return hindexes.empty();
+    }
+
+private:
+    template <typename Par, typename GridsStor>
+    friend inline void projections::detail::pj_gridlist_from_nadgrids(
+                            Par const& defn,
+                            srs::projection_grids<GridsStor> & grids);
+    template <bool Inverse, typename Par, typename Range, typename Grids>
+    friend inline bool projections::detail::pj_apply_gridshift_2(
+                            Par const& defn, Range & range, Grids const& grids);
+
+    GridsStorage * const storage_ptr;
+    std::vector<std::size_t> hindexes;
+};
+
+
+template <typename GridsStorage = grids_storage<> >
+struct transformation_grids
+{
+    explicit transformation_grids(GridsStorage & storage)
+        : src_grids(storage)
+        , dst_grids(storage)
+    {}
+
+    projection_grids<GridsStorage> src_grids;
+    projection_grids<GridsStorage> dst_grids;
+};
+
+
+namespace detail
+{
+
+struct empty_grids_storage {};
+struct empty_projection_grids {};
+
+} // namespace detail
+
+
+template <>
+struct transformation_grids<detail::empty_grids_storage>
+{
+    detail::empty_projection_grids src_grids;
+    detail::empty_projection_grids dst_grids;
+};
+
+
+}}} // namespace boost::geometry::srs
+
+
+#endif // BOOST_GEOMETRY_SRS_PROJECTIONS_GRIDS_HPP