log/expressions/attr_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   attr_fwd.hpp
0009  * \author Andrey Semashev
0010  * \date   21.07.2012
0011  *
0012  * The header contains forward declaration of a generic attribute placeholder in template expressions.
0013  */
0014
0015 #ifndef BOOST_LOG_EXPRESSIONS_ATTR_FWD_HPP_INCLUDED_
0016 #define BOOST_LOG_EXPRESSIONS_ATTR_FWD_HPP_INCLUDED_
0017
0018 #include <boost/log/detail/config.hpp>
0019 #include <boost/log/attributes/fallback_policy_fwd.hpp>
0020
0021 #ifdef BOOST_HAS_PRAGMA_ONCE
0022 #pragma once
0023 #endif
0024
0025 namespace boost {
0026
0027 #ifndef BOOST_LOG_DOXYGEN_PASS
0028
0029 namespace phoenix {
0030
0031 template< typename >
0032 struct actor;
0033
0034 } // namespace phoenix
0035
0036 #endif
0037
0038 BOOST_LOG_OPEN_NAMESPACE
0039
0040 namespace expressions {
0041
0042 /*!
0043  * An attribute value extraction terminal
0044  */
0045 template<
0046     typename T,
0047     typename FallbackPolicyT = fallback_to_none,
0048     typename TagT = void
0049 >
0050 class attribute_terminal;
0051
0052 /*!
0053  * An attribute value extraction terminal actor
0054  */
0055 template<
0056     typename T,
0057     typename FallbackPolicyT = fallback_to_none,
0058     typename TagT = void,
0059     template< typename > class ActorT = phoenix::actor
0060 >
0061 class attribute_actor;
0062
0063 } // namespace expressions
0064
0065 BOOST_LOG_CLOSE_NAMESPACE // namespace log
0066
0067 } // namespace boost
0068
0069 #endif // BOOST_LOG_EXPRESSIONS_ATTR_FWD_HPP_INCLUDED_