Added thirdparty: boost library

thirdparty/include/boost/geometry/srs/shared_grids_std.hpp

@@ -0,0 +1,99 @@
+// Boost.Geometry
+
+// Copyright (c) 2018-2019, 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_SHARED_GRIDS_STD_HPP
+#define BOOST_GEOMETRY_SRS_SHARED_GRIDS_STD_HPP
+
+
+#include <boost/config.hpp>
+
+#ifdef BOOST_NO_CXX14_HDR_SHARED_MUTEX
+#error "C++14 <shared_mutex> header required."
+#endif
+
+#include <boost/geometry/srs/projections/grids.hpp>
+
+#include <mutex>
+#include <shared_mutex>
+
+
+namespace boost { namespace geometry
+{
+
+namespace srs
+{
+
+class shared_grids_std
+{
+
+// VS 2015 Update 2
+#if defined(_MSC_FULL_VER) && (_MSC_FULL_VER >= 190023918)
+    typedef std::shared_mutex mutex_type;
+// Other C++17
+#elif !defined(BOOST_NO_CXX14_HDR_SHARED_MUTEX) && (__cplusplus > 201402L)
+    typedef std::shared_mutex mutex_type;
+#else
+    typedef std::shared_timed_mutex mutex_type;
+#endif
+
+public:
+    std::size_t size() const
+    {
+        std::shared_lock<mutex_type> lock(mutex);
+        return gridinfo.size();
+    }
+
+    bool empty() const
+    {
+        std::shared_lock<mutex_type> lock(mutex);
+        return gridinfo.empty();
+    }
+
+    typedef projections::detail::shared_grids_tag tag;
+
+    struct read_locked
+    {
+        read_locked(shared_grids_std & g)
+            : gridinfo(g.gridinfo)
+            , lock(g.mutex)
+        {}
+
+        // should be const&
+        projections::detail::pj_gridinfo & gridinfo;
+
+    private:
+        std::shared_lock<mutex_type> lock;
+    };
+
+    struct write_locked
+    {
+        write_locked(shared_grids_std & g)
+            : gridinfo(g.gridinfo)
+            , lock(g.mutex)
+        {}
+
+        projections::detail::pj_gridinfo & gridinfo;
+
+    private:
+        std::unique_lock<mutex_type> lock;
+    };
+
+private:
+    projections::detail::pj_gridinfo gridinfo;
+    mutable mutex_type mutex;
+};
+
+
+} // namespace srs
+
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_SRS_SHARED_GRIDS_STD_HPP