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diff --git a/boost/log/sinks/auto_newline_mode.hpp b/boost/log/sinks/auto_newline_mode.hpp
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+++ b/boost/log/sinks/auto_newline_mode.hpp
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+/*
+ *             Copyright Andrey Semashev 2019.
+ * Distributed under the Boost Software License, Version 1.0.
+ *    (See accompanying file LICENSE_1_0.txt or copy at
+ *          https://www.boost.org/LICENSE_1_0.txt)
+ */
+/*!
+ * \file   sinks/auto_newline_mode.hpp
+ * \author Andrey Semashev
+ * \date   23.06.2019
+ *
+ * The header contains definition of auto-newline modes.
+ */
+
+#ifndef BOOST_LOG_SINKS_AUTO_NEWLINE_MODE_HPP_INCLUDED_HPP_
+#define BOOST_LOG_SINKS_AUTO_NEWLINE_MODE_HPP_INCLUDED_HPP_
+
+#include <boost/log/detail/config.hpp>
+#include <boost/log/detail/header.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace sinks {
+
+//! The enum lists automatic trailing newline modes
+enum auto_newline_mode
+{
+    disabled_auto_newline,  //!< Do not insert automatic trailing newline characters
+    always_insert,          //!< Always insert automatic trailing newline characters
+    insert_if_missing       //!< Insert automatic trailing newline characters, if not present already
+};
+
+} // namespace sinks
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#include <boost/log/detail/footer.hpp>
+
+#endif // BOOST_LOG_SINKS_AUTO_NEWLINE_MODE_HPP_INCLUDED_HPP_