boost/geometry/srs/projections/shared_grids.hpp

   1 // Boost.Geometry
   2
   3 // This file was modified by Oracle on 2018.
   4 // Modifications copyright (c) 2018, Oracle and/or its affiliates.
   5 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
   6
   7 // Use, modification and distribution is subject to the Boost Software License,
   8 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10
  11 #ifndef BOOST_GEOMETRY_SRS_PROJECTIONS_SHARED_GRIDS_HPP
  12 #define BOOST_GEOMETRY_SRS_PROJECTIONS_SHARED_GRIDS_HPP
  13
  14
  15 #include <boost/geometry/srs/projections/impl/pj_gridinfo.hpp>
  16
  17 #include <boost/thread.hpp>
  18
  19 #include <vector>
  20
  21
  22 namespace boost { namespace geometry
  23 {
  24
  25
  26 namespace projections { namespace detail
  27 {
  28
  29 // Forward declaration for functions declarations below
  30 class shared_grids;
  31
  32 // Forward declaratios of shared_grids friends
  33 template <typename StreamPolicy>
  34 inline bool pj_gridlist_merge_gridfile(std::string const& gridname,
  35                                        StreamPolicy const& stream_policy,
  36                                        shared_grids & grids,
  37                                        std::vector<std::size_t> & gridindexes);
  38 template <bool Inverse, typename CalcT, typename StreamPolicy, typename Range>
  39 inline bool pj_apply_gridshift_3(StreamPolicy const& stream_policy,
  40                                  Range & range,
  41                                  shared_grids & grids,
  42                                  std::vector<std::size_t> const& gridindexes);
  43
  44
  45 class shared_grids
  46 {
  47 public:
  48     std::size_t size() const
  49     {
  50         boost::shared_lock<boost::shared_mutex> lock(mutex);
  51         return gridinfo.size();
  52     }
  53
  54     bool empty() const
  55     {
  56         boost::shared_lock<boost::shared_mutex> lock(mutex);
  57         return gridinfo.empty();
  58     }
  59
  60 private:
  61     template <typename StreamPolicy>
  62     friend inline bool projections::detail::pj_gridlist_merge_gridfile(
  63                             std::string const& gridname,
  64                             StreamPolicy const& stream_policy,
  65                             shared_grids & grids,
  66                             std::vector<std::size_t> & gridindexes);
  67     template <bool Inverse, typename CalcT, typename StreamPolicy, typename Range>
  68     friend inline bool projections::detail::pj_apply_gridshift_3(
  69                             StreamPolicy const& stream_policy,
  70                             Range & range,
  71                             shared_grids & grids,
  72                             std::vector<std::size_t> const& gridindexes);
  73
  74     projections::detail::pj_gridinfo gridinfo;
  75     mutable boost::shared_mutex mutex;
  76 };
  77
  78 }} // namespace projections::detail
  79
  80
  81 }} // namespace boost::geometry
  82
  83
  84 #endif // BOOST_GEOMETRY_SRS_PROJECTIONS_SHARED_GRIDS_HPP