ceph/src/boost/boost/log/utility/manipulators/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   to_log.hpp
   9  * \author Andrey Semashev
  10  * \date   06.11.2012
  11  *
  12  * This header contains the \c to_log output manipulator.
  13  */
  14
  15 #ifndef BOOST_LOG_UTILITY_MANIPULATORS_TO_LOG_HPP_INCLUDED_
  16 #define BOOST_LOG_UTILITY_MANIPULATORS_TO_LOG_HPP_INCLUDED_
  17
  18 #include <iosfwd>
  19 #include <boost/core/enable_if.hpp>
  20 #include <boost/log/detail/config.hpp>
  21 #include <boost/log/detail/is_ostream.hpp>
  22 #include <boost/log/utility/formatting_ostream_fwd.hpp>
  23 #include <boost/log/detail/header.hpp>
  24
  25 #ifdef BOOST_HAS_PRAGMA_ONCE
  26 #pragma once
  27 #endif
  28
  29 namespace boost {
  30
  31 BOOST_LOG_OPEN_NAMESPACE
  32
  33 /*!
  34  * \brief Generic manipulator for customizing output to log
  35  */
  36 template< typename T, typename TagT = void >
  37 class to_log_manip
  38 {
  39 public:
  40     //! Output value type
  41     typedef T value_type;
  42     //! Value tag type
  43     typedef TagT tag_type;
  44
  45 private:
  46     //! Reference to the value
  47     value_type const& m_value;
  48
  49 public:
  50     explicit to_log_manip(value_type const& value) BOOST_NOEXCEPT : m_value(value) {}
  51     to_log_manip(to_log_manip const& that) BOOST_NOEXCEPT : m_value(that.m_value) {}
  52
  53     value_type const& get() const BOOST_NOEXCEPT { return m_value; }
  54 };
  55
  56 template< typename StreamT, typename T, typename TagT >
  57 inline typename enable_if_c< log::aux::is_ostream< StreamT >::value, StreamT& >::type operator<< (StreamT& strm, to_log_manip< T, TagT > manip)
  58 {
  59     strm << manip.get();
  60     return strm;
  61 }
  62
  63 template< typename T >
  64 inline to_log_manip< T > to_log(T const& value) BOOST_NOEXCEPT
  65 {
  66     return to_log_manip< T >(value);
  67 }
  68
  69 template< typename TagT, typename T >
  70 inline to_log_manip< T, TagT > to_log(T const& value) BOOST_NOEXCEPT
  71 {
  72     return to_log_manip< T, TagT >(value);
  73 }
  74
  75 BOOST_LOG_CLOSE_NAMESPACE // namespace log
  76
  77 } // namespace boost
  78
  79 #include <boost/log/detail/footer.hpp>
  80
  81 #endif // BOOST_LOG_UTILITY_MANIPULATORS_TO_LOG_HPP_INCLUDED_