1 /* 2 * Copyright Andrey Semashev 2007 - 2015. 3 * Distributed under the Boost Software License, Version 1.0. 4 * (See accompanying file LICENSE_1_0.txt or copy at 5 * http://www.boost.org/LICENSE_1_0.txt) 6 */ 7 /*! 8 * \file value_visitation_fwd.hpp 9 * \author Andrey Semashev 10 * \date 01.03.2008 11 * 12 * The header contains forward declaration of convenience tools to apply visitors to an attribute value 13 * in the view. 14 */ 15 16 #ifndef BOOST_LOG_ATTRIBUTES_VALUE_VISITATION_FWD_HPP_INCLUDED_ 17 #define BOOST_LOG_ATTRIBUTES_VALUE_VISITATION_FWD_HPP_INCLUDED_ 18 19 #include <boost/log/detail/config.hpp> 20 #include <boost/log/attributes/fallback_policy_fwd.hpp> 21 22 #ifdef BOOST_HAS_PRAGMA_ONCE 23 #pragma once 24 #endif 25 26 namespace boost { 27 28 BOOST_LOG_OPEN_NAMESPACE 29 30 /*! 31 * \brief The class represents attribute value visitation result 32 */ 33 class visitation_result; 34 35 /*! 36 * \brief Generic attribute value visitor invoker 37 */ 38 template< typename T, typename FallbackPolicyT = fallback_to_none > 39 class value_visitor_invoker; 40 41 BOOST_LOG_CLOSE_NAMESPACE // namespace log 42 43 } // namespace boost 44 45 #endif // BOOST_LOG_ATTRIBUTES_VALUE_VISITATION_FWD_HPP_INCLUDED_ 46