Add make_strand

include/boost/beast/core.hpp

@@ -35,6 +35,7 @@
 #include <boost/beast/core/flat_stream.hpp>
 #include <boost/beast/core/handler_ptr.hpp>
 #include <boost/beast/core/make_printable.hpp>
+#include <boost/beast/core/make_strand.hpp>
 #include <boost/beast/core/multi_buffer.hpp>
 #include <boost/beast/core/ostream.hpp>
 #include <boost/beast/core/read_size.hpp>

include/boost/beast/core/make_strand.hpp

@@ -0,0 +1,60 @@
+//
+// Copyright (c) 2019 Vinnie Falco (vinnie dot falco at gmail dot com)
+//
+// Distributed under 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)
+//
+// Official repository: https://github.com/boostorg/beast
+//
+
+#ifndef BOOST_BEAST_MAKE_STRAND_HPP
+#define BOOST_BEAST_MAKE_STRAND_HPP
+
+#include <boost/beast/core/detail/config.hpp>
+#include <boost/beast/core/stream_traits.hpp>
+#include <boost/asio/is_executor.hpp>
+#include <boost/asio/strand.hpp>
+#include <type_traits>
+
+namespace boost {
+namespace beast {
+
+/** Return a strand usable with the specified execution context.
+*/
+#if BOOST_BEAST_DOXYGEN
+template<class ExecutionContext>
+__see_below__
+#else
+template<class ExecutionContext
+    ,class = typename std::enable_if<
+        has_get_executor<ExecutionContext>::value &&
+        std::is_convertible<
+            ExecutionContext&,
+            net::execution_context&>::value>::type
+>
+net::strand<executor_type<ExecutionContext>>
+#endif
+make_strand(ExecutionContext& context)
+{
+    return net::strand<executor_type<
+        ExecutionContext>>{context.get_executor()};
+}
+
+/** Return a strand usable with the specified executor.
+*/
+template<class Executor
+#if ! BOOST_BEAST_DOXYGEN
+    , class = typename
+        net::is_executor<Executor>::type
+#endif
+>
+net::strand<Executor>
+make_strand(Executor const& ex)
+{
+    return net::strand<Executor>{ex};
+}
+
+} // beast
+} // boost
+
+#endif