Merge commit '1dd2f4645226bd269f2407d5ed431acc3f66e7a6' as 'Sources/ASIO'

Sources/ASIO/asio/include/asio/basic_streambuf_fwd.hpp

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+//
+// basic_streambuf_fwd.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff 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)
+//
+
+#ifndef ASIO_BASIC_STREAMBUF_FWD_HPP
+#define ASIO_BASIC_STREAMBUF_FWD_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if !defined(ASIO_NO_IOSTREAM)
+
+#include <memory>
+
+namespace asio {
+
+template <typename Allocator = std::allocator<char> >
+class basic_streambuf;
+
+template <typename Allocator = std::allocator<char> >
+class basic_streambuf_ref;
+
+} // namespace asio
+
+#endif // !defined(ASIO_NO_IOSTREAM)
+
+#endif // ASIO_BASIC_STREAMBUF_FWD_HPP