log/detail/attr_output_terminal.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   attribute_output_terminal.hpp
0009  * \author Andrey Semashev
0010  * \date   06.11.2012
0011  *
0012  * The header contains implementation of a generic output manipulator in template expressions.
0013  */
0014
0015 #ifndef BOOST_LOG_DETAIL_ATTR_OUTPUT_TERMINAL_HPP_INCLUDED_
0016 #define BOOST_LOG_DETAIL_ATTR_OUTPUT_TERMINAL_HPP_INCLUDED_
0017
0018 #include <boost/mpl/bool.hpp>
0019 #include <boost/phoenix/core/actor.hpp>
0020 #include <boost/phoenix/core/meta_grammar.hpp>
0021 #include <boost/phoenix/core/environment.hpp>
0022 #include <boost/phoenix/core/terminal_fwd.hpp>
0023 #include <boost/phoenix/core/is_nullary.hpp>
0024 #include <boost/type_traits/remove_cv.hpp>
0025 #include <boost/type_traits/remove_reference.hpp>
0026 #include <boost/fusion/sequence/intrinsic/at.hpp>
0027 #include <boost/log/detail/config.hpp>
0028 #include <boost/log/detail/custom_terminal_spec.hpp>
0029 #include <boost/log/attributes/attribute_name.hpp>
0030 #include <boost/log/attributes/value_visitation.hpp>
0031 #include <boost/log/utility/functional/bind.hpp>
0032 #include <boost/log/detail/header.hpp>
0033
0034 #ifdef BOOST_HAS_PRAGMA_ONCE
0035 #pragma once
0036 #endif
0037
0038 namespace boost {
0039
0040 BOOST_LOG_OPEN_NAMESPACE
0041
0042 namespace expressions {
0043
0044 namespace aux {
0045
0046 //! Attribute stream output expression
0047 template< typename LeftT, typename T, typename FallbackPolicyT, typename ImplT >
0048 class attribute_output_terminal
0049 {
0050 private:
0051     //! Self type
0052     typedef attribute_output_terminal< LeftT, T, FallbackPolicyT, ImplT > this_type;
0053     //! Attribute value visitor invoker
0054     typedef value_visitor_invoker< T, FallbackPolicyT > visitor_invoker_type;
0055     //! Manipulator implementation
0056     typedef ImplT impl_type;
0057
0058 public:
0059     //! Internal typedef for type categorization
0060     typedef void _is_boost_log_terminal;
0061
0062     //! Result type definition
0063     template< typename >
0064     struct result;
0065
0066     template< typename ThisT, typename ContextT >
0067     struct result< ThisT(ContextT) >
0068     {
0069         typedef typename remove_cv< typename remove_reference< ContextT >::type >::type context_type;
0070         typedef typename phoenix::evaluator::impl<
0071             typename LeftT::proto_base_expr&,
0072             context_type,
0073             phoenix::unused
0074         >::result_type type;
0075     };
0076
0077 private:
0078     //! Left argument actor
0079     LeftT m_left;
0080     //! Attribute name
0081     const attribute_name m_name;
0082     //! Attribute value visitor invoker
0083     visitor_invoker_type m_visitor_invoker;
0084     //! Manipulator implementation
0085     impl_type m_impl;
0086
0087 public:
0088     //! Initializing constructor
0089     attribute_output_terminal(LeftT const& left, attribute_name const& name) : m_left(left), m_name(name)
0090     {
0091     }
0092
0093     //! Initializing constructor
0094     attribute_output_terminal(LeftT const& left, attribute_name const& name, impl_type const& impl) : m_left(left), m_name(name), m_impl(impl)
0095     {
0096     }
0097
0098     //! Initializing constructor
0099     template< typename U >
0100     attribute_output_terminal(LeftT const& left, attribute_name const& name, impl_type const& impl, U const& arg) :
0101         m_left(left), m_name(name), m_visitor_invoker(arg), m_impl(impl)
0102     {
0103     }
0104
0105     //! Copy constructor
0106     attribute_output_terminal(attribute_output_terminal const& that) :
0107         m_left(that.m_left), m_name(that.m_name), m_visitor_invoker(that.m_visitor_invoker), m_impl(that.m_impl)
0108     {
0109     }
0110
0111     //! Invokation operator
0112     template< typename ContextT >
0113     typename result< this_type(ContextT const&) >::type operator() (ContextT const& ctx)
0114     {
0115         typedef typename result< this_type(ContextT const&) >::type result_type;
0116         result_type strm = phoenix::eval(m_left, ctx);
0117         m_visitor_invoker(m_name, fusion::at_c< 0 >(phoenix::env(ctx).args()), binder1st< impl_type&, result_type >(m_impl, strm));
0118         return strm;
0119     }
0120
0121     //! Invokation operator
0122     template< typename ContextT >
0123     typename result< const this_type(ContextT const&) >::type operator() (ContextT const& ctx) const
0124     {
0125         typedef typename result< const this_type(ContextT const&) >::type result_type;
0126         result_type strm = phoenix::eval(m_left, ctx);
0127         m_visitor_invoker(m_name, fusion::at_c< 0 >(phoenix::env(ctx).args()), binder1st< impl_type const&, result_type >(m_impl, strm));
0128         return strm;
0129     }
0130
0131     BOOST_DELETED_FUNCTION(attribute_output_terminal())
0132 };
0133
0134 } // namespace aux
0135
0136 } // namespace expressions
0137
0138 BOOST_LOG_CLOSE_NAMESPACE // namespace log
0139
0140 #ifndef BOOST_LOG_DOXYGEN_PASS
0141
0142 namespace phoenix {
0143
0144 namespace result_of {
0145
0146 template< typename LeftT, typename T, typename FallbackPolicyT, typename ImplT >
0147 struct is_nullary< custom_terminal< boost::log::expressions::aux::attribute_output_terminal< LeftT, T, FallbackPolicyT, ImplT > > > :
0148     public mpl::false_
0149 {
0150 };
0151
0152 } // namespace result_of
0153
0154 } // namespace phoenix
0155
0156 #endif // !defined(BOOST_LOG_DOXYGEN_PASS)
0157
0158 } // namespace boost
0159
0160 #include <boost/log/detail/footer.hpp>
0161
0162 #endif // BOOST_LOG_DETAIL_ATTR_OUTPUT_TERMINAL_HPP_INCLUDED_