ceph/src/boost/libs/log/include/boost/log/sinks/basic_sink_backend.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   basic_sink_backend.hpp
   9  * \author Andrey Semashev
  10  * \date   04.11.2007
  11  *
  12  * The header contains implementation of base classes for sink backends.
  13  */
  14
  15 #ifndef BOOST_LOG_SINKS_BASIC_SINK_BACKEND_HPP_INCLUDED_
  16 #define BOOST_LOG_SINKS_BASIC_SINK_BACKEND_HPP_INCLUDED_
  17
  18 #include <string>
  19 #include <boost/type_traits/is_same.hpp>
  20 #include <boost/log/detail/config.hpp>
  21 #include <boost/log/sinks/frontend_requirements.hpp>
  22 #include <boost/log/core/record_view.hpp>
  23 #include <boost/log/attributes/attribute_value_set.hpp>
  24 #include <boost/log/detail/header.hpp>
  25
  26 #ifdef BOOST_HAS_PRAGMA_ONCE
  27 #pragma once
  28 #endif
  29
  30 namespace boost {
  31
  32 BOOST_LOG_OPEN_NAMESPACE
  33
  34 namespace sinks {
  35
  36 /*!
  37  * \brief Base class for a logging sink backend
  38  *
  39  * The \c basic_sink_backend class template defines a number of types that
  40  * all sink backends are required to define. All sink backends have to derive from the class.
  41  */
  42 template< typename FrontendRequirementsT >
  43 struct basic_sink_backend
  44 {
  45     //! Frontend requirements tag
  46     typedef FrontendRequirementsT frontend_requirements;
  47
  48     BOOST_DEFAULTED_FUNCTION(basic_sink_backend(), {})
  49
  50     BOOST_DELETED_FUNCTION(basic_sink_backend(basic_sink_backend const&))
  51     BOOST_DELETED_FUNCTION(basic_sink_backend& operator= (basic_sink_backend const&))
  52 };
  53
  54 /*!
  55  * \brief A base class for a logging sink backend with message formatting support
  56  *
  57  * The \c basic_formatted_sink_backend class template indicates to the frontend that
  58  * the backend requires logging record formatting.
  59  *
  60  * The class allows to request encoding conversion in case if the sink backend
  61  * requires the formatted string in some particular encoding (e.g. if underlying API
  62  * supports only narrow or wide characters). In order to perform conversion one
  63  * should specify the desired final character type in the \c TargetCharT template
  64  * parameter.
  65  */
  66 template<
  67     typename CharT,
  68     typename FrontendRequirementsT = synchronized_feeding
  69 >
  70 struct basic_formatted_sink_backend :
  71     public basic_sink_backend<
  72         typename combine_requirements< FrontendRequirementsT, formatted_records >::type
  73     >
  74 {
  75 private:
  76     typedef basic_sink_backend<
  77         typename combine_requirements< FrontendRequirementsT, formatted_records >::type
  78     > base_type;
  79
  80 public:
  81     //! Character type
  82     typedef CharT char_type;
  83     //! Formatted string type
  84     typedef std::basic_string< char_type > string_type;
  85     //! Frontend requirements
  86     typedef typename base_type::frontend_requirements frontend_requirements;
  87 };
  88
  89 } // namespace sinks
  90
  91 BOOST_LOG_CLOSE_NAMESPACE // namespace log
  92
  93 } // namespace boost
  94
  95 #include <boost/log/detail/footer.hpp>
  96
  97 #endif // BOOST_LOG_SINKS_BASIC_SINK_BACKEND_HPP_INCLUDED_