ceph/src/boost/libs/log/include/boost/log/expressions/formatters/format.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   formatters/format.hpp
   9  * \author Andrey Semashev
  10  * \date   15.11.2012
  11  *
  12  * The header contains a generic log record formatter function.
  13  */
  14
  15 #ifndef BOOST_LOG_EXPRESSIONS_FORMATTERS_FORMAT_HPP_INCLUDED_
  16 #define BOOST_LOG_EXPRESSIONS_FORMATTERS_FORMAT_HPP_INCLUDED_
  17
  18 #include <string>
  19 #include <boost/mpl/bool.hpp>
  20 #include <boost/phoenix/core/actor.hpp>
  21 #include <boost/phoenix/core/terminal_fwd.hpp>
  22 #include <boost/phoenix/core/is_nullary.hpp>
  23 #include <boost/phoenix/core/environment.hpp>
  24 #include <boost/fusion/sequence/intrinsic/at_c.hpp>
  25 #include <boost/log/detail/config.hpp>
  26 #include <boost/log/detail/format.hpp>
  27 #include <boost/log/detail/custom_terminal_spec.hpp>
  28 #include <boost/log/detail/header.hpp>
  29
  30 #ifdef BOOST_HAS_PRAGMA_ONCE
  31 #pragma once
  32 #endif
  33
  34 namespace boost {
  35
  36 BOOST_LOG_OPEN_NAMESPACE
  37
  38 namespace expressions {
  39
  40 /*!
  41  * \brief Template expressions terminal node with Boost.Format-like formatter
  42  */
  43 template< typename CharT >
  44 class format_terminal
  45 {
  46 public:
  47 #ifndef BOOST_LOG_DOXYGEN_PASS
  48     //! Internal typedef for type categorization
  49     typedef void _is_boost_log_terminal;
  50 #endif
  51
  52     //! Character type
  53     typedef CharT char_type;
  54     //! Boost.Format formatter type
  55     typedef boost::log::aux::basic_format< char_type > format_type;
  56     //! String type
  57     typedef std::basic_string< char_type > string_type;
  58
  59     //! Terminal result type
  60     typedef typename format_type::pump result_type;
  61
  62 private:
  63     //! Formatter object
  64     mutable format_type m_format;
  65
  66 public:
  67     //! Initializing constructor
  68     explicit format_terminal(const char_type* format) : m_format(format) {}
  69
  70     //! Invokation operator
  71     template< typename ContextT >
  72     result_type operator() (ContextT const& ctx) const
  73     {
  74         return m_format.make_pump(fusion::at_c< 1 >(phoenix::env(ctx).args()));
  75     }
  76
  77     BOOST_DELETED_FUNCTION(format_terminal())
  78 };
  79
  80 /*!
  81  * The function generates a terminal node in a template expression. The node will perform log record formatting
  82  * according to the provided format string.
  83  */
  84 template< typename CharT >
  85 BOOST_FORCEINLINE phoenix::actor< format_terminal< CharT > > format(const CharT* fmt)
  86 {
  87     typedef format_terminal< CharT > terminal_type;
  88     phoenix::actor< terminal_type > act = {{ terminal_type(fmt) }};
  89     return act;
  90 }
  91
  92 /*!
  93  * The function generates a terminal node in a template expression. The node will perform log record formatting
  94  * according to the provided format string.
  95  */
  96 template< typename CharT, typename TraitsT, typename AllocatorT >
  97 BOOST_FORCEINLINE phoenix::actor< format_terminal< CharT > > format(std::basic_string< CharT, TraitsT, AllocatorT > const& fmt)
  98 {
  99     typedef format_terminal< CharT > terminal_type;
 100     phoenix::actor< terminal_type > act = {{ terminal_type(fmt.c_str()) }};
 101     return act;
 102 }
 103
 104 } // namespace expressions
 105
 106 BOOST_LOG_CLOSE_NAMESPACE // namespace log
 107
 108 #ifndef BOOST_LOG_DOXYGEN_PASS
 109
 110 namespace phoenix {
 111
 112 namespace result_of {
 113
 114 template< typename CharT >
 115 struct is_nullary< custom_terminal< boost::log::expressions::format_terminal< CharT > > > :
 116     public mpl::false_
 117 {
 118 };
 119
 120 } // namespace result_of
 121
 122 } // namespace phoenix
 123
 124 #endif
 125
 126 } // namespace boost
 127
 128 #include <boost/log/detail/footer.hpp>
 129
 130 #endif // BOOST_LOG_EXPRESSIONS_FORMATTERS_FORMAT_HPP_INCLUDED_