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+//
+// detail/cstddef.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2017 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 BOOST_ASIO_DETAIL_CSTDDEF_HPP
+#define BOOST_ASIO_DETAIL_CSTDDEF_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <cstddef>
+
+namespace boost {
+namespace asio {
+
+#if defined(BOOST_ASIO_HAS_NULLPTR)
+using std::nullptr_t;
+#else // defined(BOOST_ASIO_HAS_NULLPTR)
+struct nullptr_t {};
+#endif // defined(BOOST_ASIO_HAS_NULLPTR)
+
+} // namespace asio
+} // namespace boost
+
+#endif // BOOST_ASIO_DETAIL_CSTDDEF_HPP