log/utility/value_ref_fwd.hpp

0001 /*
0002  *          Copyright Andrey Semashev 2007 - 2015.
0003  * Distributed under the Boost Software License, Version 1.0.
0004  *    (See accompanying file LICENSE_1_0.txt or copy at
0005  *          http://www.boost.org/LICENSE_1_0.txt)
0006  */
0007 /*!
0008  * \file   value_ref_fwd.hpp
0009  * \author Andrey Semashev
0010  * \date   27.07.2012
0011  *
0012  * The header contains forward declaration of a value reference wrapper.
0013  */
0014
0015 #ifndef BOOST_LOG_UTILITY_VALUE_REF_FWD_HPP_INCLUDED_
0016 #define BOOST_LOG_UTILITY_VALUE_REF_FWD_HPP_INCLUDED_
0017
0018 #include <boost/log/detail/config.hpp>
0019
0020 #ifdef BOOST_HAS_PRAGMA_ONCE
0021 #pragma once
0022 #endif
0023
0024 namespace boost {
0025
0026 BOOST_LOG_OPEN_NAMESPACE
0027
0028 /*!
0029  * \brief Reference wrapper for a stored attribute value.
0030  */
0031 template< typename T, typename TagT = void >
0032 class value_ref;
0033
0034 BOOST_LOG_CLOSE_NAMESPACE // namespace log
0035
0036 } // namespace boost
0037
0038 #endif // BOOST_LOG_UTILITY_VALUE_REF_FWD_HPP_INCLUDED_