ceph/src/boost/libs/log/include/boost/log/utility/functional/bind_to_log.hpp

   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 >
  39     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 >
  52     void operator() (StreamT& strm, T const& val) const
  53     {
  54         strm << boost::log::to_log(val);
  55     }
  56 };
  57
  58 template< typename StreamT >
  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 >
  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_