import quincy beta 17.1.0

[ceph.git] / ceph / src / boost / boost / beast / core / detail / work_guard.hpp

diff --git a/ceph/src/boost/boost/beast/core/detail/work_guard.hpp b/ceph/src/boost/boost/beast/core/detail/work_guard.hpp
new file mode 100644 (file)
index 0000000..13a2267
--- /dev/null
+++ b/ceph/src/boost/boost/beast/core/detail/work_guard.hpp
@@ -0,0 +1,93 @@
+#ifndef BOOST_BEAST_CORE_DETAIL_WORK_GUARD_HPP
+#define BOOST_BEAST_CORE_DETAIL_WORK_GUARD_HPP
+
+#include <boost/asio/executor_work_guard.hpp>
+#include <boost/asio/execution.hpp>
+#include <boost/optional.hpp>
+
+namespace boost {
+namespace beast {
+namespace detail {
+
+template<class Executor, class Enable = void>
+struct select_work_guard;
+
+template<class Executor>
+using select_work_guard_t = typename
+    select_work_guard<Executor>::type;
+
+#if !defined(BOOST_ASIO_NO_TS_EXECUTORS)
+template<class Executor>
+struct select_work_guard
+<
+    Executor,
+    typename std::enable_if
+    <
+        net::is_executor<Executor>::value
+    >::type
+>
+{
+    using type = net::executor_work_guard<Executor>;
+};
+#endif
+
+template<class Executor>
+struct execution_work_guard
+{
+    using executor_type = decltype(
+        net::prefer(std::declval<Executor const&>(),
+            net::execution::outstanding_work.tracked));
+
+    execution_work_guard(Executor const& exec)
+    : ex_(net::prefer(exec, net::execution::outstanding_work.tracked))
+    {
+
+    }
+
+    executor_type
+    get_executor() const noexcept
+    {
+        BOOST_ASSERT(ex_.has_value());
+        return *ex_;
+    }
+
+    void reset() noexcept
+    {
+        ex_.reset();
+    }
+
+private:
+
+    boost::optional<executor_type> ex_;
+};
+
+template<class Executor>
+struct select_work_guard
+<
+    Executor,
+    typename std::enable_if
+    <
+        net::execution::is_executor<Executor>::value
+#if defined(BOOST_ASIO_NO_TS_EXECUTORS)
+        || net::is_executor<Executor>::value
+#else
+        && !net::is_executor<Executor>::value
+#endif
+    >::type
+>
+{
+    using type = execution_work_guard<Executor>;
+};
+
+template<class Executor>
+select_work_guard_t<Executor>
+make_work_guard(Executor const& exec) noexcept
+{
+    return select_work_guard_t<Executor>(exec);
+}
+
+}
+}
+}
+
+#endif // BOOST_BEAST_CORE_DETAIL_WORK_GUARD_HPP