boost/geometry/srs/shared_grids_boost.hpp

   1 // Boost.Geometry
   2
   3 // Copyright (c) 2018-2019, Oracle and/or its affiliates.
   4 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
   5
   6 // Use, modification and distribution is subject to the Boost Software License,
   7 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   8 // http://www.boost.org/LICENSE_1_0.txt)
   9
  10 #ifndef BOOST_GEOMETRY_SRS_SHARED_GRIDS_BOOST_HPP
  11 #define BOOST_GEOMETRY_SRS_SHARED_GRIDS_BOOST_HPP
  12
  13
  14 #include <boost/geometry/srs/projections/grids.hpp>
  15
  16
  17 #include <boost/thread.hpp>
  18
  19
  20 namespace boost { namespace geometry
  21 {
  22
  23 namespace srs
  24 {
  25
  26 class shared_grids_boost
  27 {
  28 public:
  29     std::size_t size() const
  30     {
  31         boost::shared_lock<boost::shared_mutex> lock(mutex);
  32         return gridinfo.size();
  33     }
  34
  35     bool empty() const
  36     {
  37         boost::shared_lock<boost::shared_mutex> lock(mutex);
  38         return gridinfo.empty();
  39     }
  40
  41     typedef projections::detail::shared_grids_tag tag;
  42
  43     struct read_locked
  44     {
  45         read_locked(shared_grids_boost & g)
  46             : gridinfo(g.gridinfo)
  47             , lock(g.mutex)
  48         {}
  49
  50         // should be const&
  51         projections::detail::pj_gridinfo & gridinfo;
  52
  53     private:
  54         boost::shared_lock<boost::shared_mutex> lock;
  55     };
  56
  57     struct write_locked
  58     {
  59         write_locked(shared_grids_boost & g)
  60             : gridinfo(g.gridinfo)
  61             , lock(g.mutex)
  62         {}
  63
  64         projections::detail::pj_gridinfo & gridinfo;
  65
  66     private:
  67         boost::unique_lock<boost::shared_mutex> lock;
  68     };
  69
  70 private:
  71     projections::detail::pj_gridinfo gridinfo;
  72     mutable boost::shared_mutex mutex;
  73 };
  74
  75
  76 } // namespace srs
  77
  78
  79 }} // namespace boost::geometry
  80
  81
  82 #endif // BOOST_GEOMETRY_SRS_SHARED_GRIDS_BOOST_HPP