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   attr_output_impl.hpp
9  * \author Andrey Semashev
10  * \date   12.08.2012
11  *
12  * \brief  This header is the Boost.Log library implementation, see the library documentation
13  *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
14  */
15 
16 #ifndef BOOST_LOG_DETAIL_ATTR_OUTPUT_IMPL_HPP_INCLUDED_
17 #define BOOST_LOG_DETAIL_ATTR_OUTPUT_IMPL_HPP_INCLUDED_
18 
19 #include <boost/mpl/is_sequence.hpp>
20 #include <boost/phoenix/core/actor.hpp>
21 #include <boost/log/detail/config.hpp>
22 #include <boost/log/expressions/attr.hpp>
23 #include <boost/log/utility/functional/bind_to_log.hpp>
24 #include <boost/log/detail/attr_output_terminal.hpp>
25 #include <boost/log/detail/header.hpp>
26 
27 #ifdef BOOST_HAS_PRAGMA_ONCE
28 #pragma once
29 #endif
30 
31 namespace boost {
32 
33 BOOST_LOG_OPEN_NAMESPACE
34 
35 namespace expressions {
36 
37 namespace aux {
38 
39 template< typename LeftT, typename T, typename FallbackPolicyT, typename TagT >
40 struct make_output_expression
41 {
42     //! Resulting expression
43     typedef attribute_output_terminal< LeftT, T, FallbackPolicyT, to_log_fun< TagT > > type;
44 
45     //! Creates the output expression
46     template< typename RightT >
makeboost::expressions::aux::make_output_expression47     static BOOST_FORCEINLINE type make(LeftT const& left, RightT const& right)
48     {
49         return type(left, right.get_name(), to_log_fun< TagT >(), right.get_fallback_policy());
50     }
51 };
52 
53 template< typename LeftT, typename RightT, typename ValueT = typename RightT::value_type, bool IsSequenceV = mpl::is_sequence< ValueT >::value >
54 struct make_output_actor;
55 
56 template< template< typename > class ActorT, typename LeftExprT, typename RightT, typename ValueT >
57 struct make_output_actor< ActorT< LeftExprT >, RightT, ValueT, false >
58 {
59     typedef make_output_expression<
60         ActorT< LeftExprT >,
61         ValueT,
62         typename RightT::fallback_policy,
63         typename RightT::tag_type
64     > make_expression;
65 
66     typedef ActorT< typename make_expression::type > type;
67 
makeboost::expressions::aux::make_output_actor68     static BOOST_FORCEINLINE type make(ActorT< LeftExprT > const& left, RightT const& right)
69     {
70         type res = {{ make_expression::make(left, right) }};
71         return res;
72     }
73 };
74 
75 template< template< typename > class ActorT, typename LeftExprT, typename RightT, typename ValueT >
76 struct make_output_actor< ActorT< LeftExprT >, RightT, ValueT, true >
77 {
78     typedef attribute_output_terminal< ActorT< LeftExprT >, ValueT, typename RightT::fallback_policy, to_log_fun< typename RightT::tag_type > > expression_type;
79 
80     typedef ActorT< expression_type > type;
81 
makeboost::expressions::aux::make_output_actor82     static BOOST_FORCEINLINE type make(ActorT< LeftExprT > const& left, RightT const& right)
83     {
84         type res = {{ expression_type(left, right.get_name(), to_log_fun< typename RightT::tag_type >(), right.get_fallback_policy()) }};
85         return res;
86     }
87 };
88 
89 } // namespace aux
90 
91 #define BOOST_LOG_AUX_OVERLOAD(left_ref, right_ref)\
92     template< typename LeftExprT, typename T, typename FallbackPolicyT, typename TagT >\
93     BOOST_FORCEINLINE typename aux::make_output_actor< phoenix::actor< LeftExprT >, attribute_actor< T, FallbackPolicyT, TagT, phoenix::actor > >::type\
94     operator<< (phoenix::actor< LeftExprT > left_ref left, attribute_actor< T, FallbackPolicyT, TagT, phoenix::actor > right_ref right)\
95     {\
96         return aux::make_output_actor< phoenix::actor< LeftExprT >, attribute_actor< T, FallbackPolicyT, TagT, phoenix::actor > >::make(left, right);\
97     }
98 
99 #include <boost/log/detail/generate_overloads.hpp>
100 
101 #undef BOOST_LOG_AUX_OVERLOAD
102 
103 } // namespace expressions
104 
105 BOOST_LOG_CLOSE_NAMESPACE // namespace log
106 
107 } // namespace boost
108 
109 #include <boost/log/detail/footer.hpp>
110 
111 #endif // BOOST_LOG_DETAIL_ATTR_OUTPUT_IMPL_HPP_INCLUDED_
112