utility/functional/bind_output.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   bind_output.hpp
0009  * \author Andrey Semashev
0010  * \date   30.03.2008
0011  *
0012  * This header contains a function object that puts the received value to the bound stream.
0013  * This is a lightweight alternative to what Boost.Phoenix and Boost.Lambda provides.
0014  */
0015
0016 #ifndef BOOST_LOG_UTILITY_FUNCTIONAL_BIND_OUTPUT_HPP_INCLUDED_
0017 #define BOOST_LOG_UTILITY_FUNCTIONAL_BIND_OUTPUT_HPP_INCLUDED_
0018
0019 #include <boost/log/detail/config.hpp>
0020 #include <boost/log/utility/functional/bind.hpp>
0021 #include <boost/log/detail/header.hpp>
0022
0023 #ifdef BOOST_HAS_PRAGMA_ONCE
0024 #pragma once
0025 #endif
0026
0027 namespace boost {
0028
0029 BOOST_LOG_OPEN_NAMESPACE
0030
0031 //! The function object that outputs its second operand to the first one
0032 struct output_fun
0033 {
0034     typedef void result_type;
0035
0036     template< typename StreamT, typename T >
0037     void operator() (StreamT& strm, T const& val) const
0038     {
0039         strm << val;
0040     }
0041 };
0042
0043 template< typename StreamT >
0044 BOOST_FORCEINLINE binder1st< output_fun, StreamT& > bind_output(StreamT& strm)
0045 {
0046     return binder1st< output_fun, StreamT& >(output_fun(), strm);
0047 }
0048
0049 BOOST_LOG_CLOSE_NAMESPACE // namespace log
0050
0051 } // namespace boost
0052
0053 #include <boost/log/detail/footer.hpp>
0054
0055 #endif // BOOST_LOG_UTILITY_FUNCTIONAL_BIND_OUTPUT_HPP_INCLUDED_