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diff --git a/boost/log/detail/c_str.hpp b/boost/log/detail/c_str.hpp
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+/*
+ *             Copyright Andrey Semashev 2016.
+ * 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)
+ */
+/*!
+ * \file   c_str.hpp
+ * \author Andrey Semashev
+ * \date   23.02.2016
+ *
+ * This header is the Boost.Log library implementation, see the library documentation
+ * at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
+ */
+
+#ifndef BOOST_LOG_DETAIL_C_STR_HPP_INCLUDED_
+#define BOOST_LOG_DETAIL_C_STR_HPP_INCLUDED_
+
+#include <string>
+#include <boost/core/enable_if.hpp>
+#include <boost/log/detail/config.hpp>
+#include <boost/log/detail/is_character_type.hpp>
+#include <boost/log/detail/header.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace aux {
+
+template< typename T >
+inline typename boost::enable_if_c< is_character_type< T >::value, const T* >::type c_str(const T* str) BOOST_NOEXCEPT
+{
+    return str;
+}
+
+template< typename T, typename TraitsT, typename AllocatorT >
+inline typename boost::enable_if_c< is_character_type< T >::value, const T* >::type c_str(std::basic_string< T, TraitsT, AllocatorT > const& str) BOOST_NOEXCEPT
+{
+    return str.c_str();
+}
+
+} // namespace aux
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#include <boost/log/detail/footer.hpp>
+
+#endif // BOOST_LOG_DETAIL_C_STR_HPP_INCLUDED_