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   custom_terminal_spec.hpp
9  * \author Andrey Semashev
10  * \date   29.01.2012
11  *
12  * The header contains Boost.Phoenix custom terminal specialization for Boost.Log terminals.
13  */
14 
15 #ifndef BOOST_LOG_DETAIL_CUSTOM_TERMINAL_SPEC_HPP_INCLUDED_
16 #define BOOST_LOG_DETAIL_CUSTOM_TERMINAL_SPEC_HPP_INCLUDED_
17 
18 #include <boost/mpl/bool.hpp>
19 #include <boost/phoenix/core/terminal_fwd.hpp>
20 #include <boost/phoenix/core/is_nullary.hpp>
21 #include <boost/phoenix/core/terminal.hpp> // needed for terminal-related part of the grammar
22 #include <boost/type_traits/remove_cv.hpp>
23 #include <boost/type_traits/remove_reference.hpp>
24 #include <boost/utility/result_of.hpp>
25 #include <boost/log/detail/config.hpp>
26 #include <boost/log/detail/header.hpp>
27 
28 #ifdef BOOST_HAS_PRAGMA_ONCE
29 #pragma once
30 #endif
31 
32 namespace boost {
33 
34 namespace phoenix {
35 
36 template< typename T >
37 struct is_custom_terminal< T, typename T::_is_boost_log_terminal > :
38     public mpl::true_
39 {
40 };
41 
42 template< typename T >
43 struct custom_terminal< T, typename T::_is_boost_log_terminal >
44 {
45     typedef custom_terminal< T, typename T::_is_boost_log_terminal > this_type;
46 
47     template< typename >
48     struct result;
49 
50     template< typename ThisT, typename TermT, typename ContextT >
51     struct result< ThisT(TermT, ContextT) >
52     {
53         typedef typename remove_cv< typename remove_reference< TermT >::type >::type term;
54         typedef typename boost::result_of< const term(ContextT) >::type type;
55     };
56 
57     template< typename ContextT >
operator ()boost::phoenix::custom_terminal58     typename result< const this_type(T const&, ContextT&) >::type operator() (T const& term, ContextT& ctx) const
59     {
60         return term(ctx);
61     }
62 };
63 
64 } // namespace phoenix
65 
66 } // namespace boost
67 
68 #include <boost/log/detail/footer.hpp>
69 
70 #endif // BOOST_LOG_DETAIL_CUSTOM_TERMINAL_SPEC_HPP_INCLUDED_
71