add boost on mac

macx64/include/boost/beast/websocket/impl/ssl.hpp

@@ -0,0 +1,59 @@
+//
+// Copyright (c) 2016-2019 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_WEBSOCKET_IMPL_SSL_HPP
+#define BOOST_BEAST_WEBSOCKET_IMPL_SSL_HPP
+
+#include <utility>
+
+namespace boost {
+namespace beast {
+
+/*
+
+    See
+    http://stackoverflow.com/questions/32046034/what-is-the-proper-way-to-securely-disconnect-an-asio-ssl-socket/32054476#32054476
+
+    Behavior of ssl::stream regarding close_notify
+
+    If the remote host calls async_shutdown then the
+    local host's async_read will complete with eof.
+
+    If both hosts call async_shutdown then the calls
+    to async_shutdown will complete with eof.
+
+*/
+
+template<class AsyncStream>
+void
+teardown(
+    role_type,
+    net::ssl::stream<AsyncStream>& stream,
+    error_code& ec)
+{
+    stream.shutdown(ec);
+}
+
+template<
+    class AsyncStream,
+    class TeardownHandler>
+void
+async_teardown(
+    role_type,
+    net::ssl::stream<AsyncStream>& stream,
+    TeardownHandler&& handler)
+{
+    stream.async_shutdown(
+        std::forward<TeardownHandler>(handler));
+}
+
+} // beast
+} // boost
+
+#endif