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 bind_to_log.hpp
9 * \author Andrey Semashev
10 * \date 06.11.2012
11 *
12 * This header contains a function object that puts the received value to the bound stream using the \c to_log manipulator.
13 * This is a lightweight alternative to what Boost.Phoenix and Boost.Lambda provides.
14 */
15
16 #ifndef BOOST_LOG_UTILITY_FUNCTIONAL_BIND_TO_LOG_HPP_INCLUDED_
17 #define BOOST_LOG_UTILITY_FUNCTIONAL_BIND_TO_LOG_HPP_INCLUDED_
18
19 #include <boost/log/detail/config.hpp>
20 #include <boost/log/utility/functional/bind.hpp>
21 #include <boost/log/utility/manipulators/to_log.hpp>
22 #include <boost/log/detail/header.hpp>
23
24 #ifdef BOOST_HAS_PRAGMA_ONCE
25 #pragma once
26 #endif
27
28 namespace boost {
29
30 BOOST_LOG_OPEN_NAMESPACE
31
32 //! The function object that outputs its second operand to the first one
33 template< typename TagT = void >
34 struct to_log_fun
35 {
36 typedef void result_type;
37
38 template< typename StreamT, typename T >
operator ()boost::to_log_fun39 void operator() (StreamT& strm, T const& val) const
40 {
41 strm << boost::log::to_log< TagT >(val);
42 }
43 };
44
45 //! The function object that outputs its second operand to the first one
46 template< >
47 struct to_log_fun< void >
48 {
49 typedef void result_type;
50
51 template< typename StreamT, typename T >
operator ()boost::to_log_fun52 void operator() (StreamT& strm, T const& val) const
53 {
54 strm << boost::log::to_log(val);
55 }
56 };
57
58 template< typename StreamT >
bind_to_log(StreamT & strm)59 BOOST_FORCEINLINE binder1st< to_log_fun< >, StreamT& > bind_to_log(StreamT& strm)
60 {
61 return binder1st< to_log_fun< >, StreamT& >(to_log_fun< >(), strm);
62 }
63
64 template< typename TagT, typename StreamT >
bind_to_log(StreamT & strm)65 BOOST_FORCEINLINE binder1st< to_log_fun< TagT >, StreamT& > bind_to_log(StreamT& strm)
66 {
67 return binder1st< to_log_fun< TagT >, StreamT& >(to_log_fun< TagT >(), strm);
68 }
69
70 BOOST_LOG_CLOSE_NAMESPACE // namespace log
71
72 } // namespace boost
73
74 #include <boost/log/detail/footer.hpp>
75
76 #endif // BOOST_LOG_UTILITY_FUNCTIONAL_BIND_TO_LOG_HPP_INCLUDED_
77