log/attributes/value_visitation_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_visitation_fwd.hpp
0009  * \author Andrey Semashev
0010  * \date   01.03.2008
0011  *
0012  * The header contains forward declaration of convenience tools to apply visitors to an attribute value
0013  * in the view.
0014  */
0015
0016 #ifndef BOOST_LOG_ATTRIBUTES_VALUE_VISITATION_FWD_HPP_INCLUDED_
0017 #define BOOST_LOG_ATTRIBUTES_VALUE_VISITATION_FWD_HPP_INCLUDED_
0018
0019 #include <boost/log/detail/config.hpp>
0020 #include <boost/log/attributes/fallback_policy_fwd.hpp>
0021
0022 #ifdef BOOST_HAS_PRAGMA_ONCE
0023 #pragma once
0024 #endif
0025
0026 namespace boost {
0027
0028 BOOST_LOG_OPEN_NAMESPACE
0029
0030 /*!
0031  * \brief The class represents attribute value visitation result
0032  */
0033 class visitation_result;
0034
0035 /*!
0036  * \brief Generic attribute value visitor invoker
0037  */
0038 template< typename T, typename FallbackPolicyT = fallback_to_none >
0039 class value_visitor_invoker;
0040
0041 BOOST_LOG_CLOSE_NAMESPACE // namespace log
0042
0043 } // namespace boost
0044
0045 #endif // BOOST_LOG_ATTRIBUTES_VALUE_VISITATION_FWD_HPP_INCLUDED_