100 lines
2.1 KiB
C++
100 lines
2.1 KiB
C++
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// Boost.Geometry
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// Copyright (c) 2018-2019, Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_SRS_SHARED_GRIDS_STD_HPP
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#define BOOST_GEOMETRY_SRS_SHARED_GRIDS_STD_HPP
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#include <boost/config.hpp>
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#ifdef BOOST_NO_CXX14_HDR_SHARED_MUTEX
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#error "C++14 <shared_mutex> header required."
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#endif
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#include <boost/geometry/srs/projections/grids.hpp>
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#include <mutex>
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#include <shared_mutex>
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namespace boost { namespace geometry
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{
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namespace srs
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{
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class shared_grids_std
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{
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// VS 2015 Update 2
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#if defined(_MSC_FULL_VER) && (_MSC_FULL_VER >= 190023918)
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typedef std::shared_mutex mutex_type;
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// Other C++17
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#elif !defined(BOOST_NO_CXX14_HDR_SHARED_MUTEX) && (__cplusplus > 201402L)
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typedef std::shared_mutex mutex_type;
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#else
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typedef std::shared_timed_mutex mutex_type;
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#endif
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public:
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std::size_t size() const
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{
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std::shared_lock<mutex_type> lock(mutex);
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return gridinfo.size();
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}
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bool empty() const
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{
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std::shared_lock<mutex_type> lock(mutex);
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return gridinfo.empty();
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}
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typedef projections::detail::shared_grids_tag tag;
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struct read_locked
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{
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read_locked(shared_grids_std & g)
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: gridinfo(g.gridinfo)
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, lock(g.mutex)
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{}
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// should be const&
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projections::detail::pj_gridinfo & gridinfo;
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private:
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std::shared_lock<mutex_type> lock;
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};
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struct write_locked
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{
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write_locked(shared_grids_std & g)
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: gridinfo(g.gridinfo)
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, lock(g.mutex)
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{}
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projections::detail::pj_gridinfo & gridinfo;
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private:
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std::unique_lock<mutex_type> lock;
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};
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private:
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projections::detail::pj_gridinfo gridinfo;
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mutable mutex_type mutex;
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};
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} // namespace srs
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_SRS_SHARED_GRIDS_STD_HPP
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