ceph/src/boost/libs/log/include/boost/log/detail/parameter_tools.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   parameter_tools.hpp
   9  * \author Andrey Semashev
  10  * \date   28.06.2009
  11  *
  12  * \brief  This header is the Boost.Log library implementation, see the library documentation
  13  *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
  14  */
  15
  16 #ifndef BOOST_LOG_DETAIL_PARAMETER_TOOLS_HPP_INCLUDED_
  17 #define BOOST_LOG_DETAIL_PARAMETER_TOOLS_HPP_INCLUDED_
  18
  19 #include <boost/parameter/keyword.hpp>
  20 #include <boost/preprocessor/control/if.hpp>
  21 #include <boost/preprocessor/comparison/equal.hpp>
  22 #include <boost/preprocessor/repetition/enum_params.hpp>
  23 #include <boost/preprocessor/repetition/enum_binary_params.hpp>
  24 #include <boost/preprocessor/repetition/repeat_from_to.hpp>
  25 #include <boost/preprocessor/facilities/intercept.hpp>
  26 #include <boost/preprocessor/arithmetic/dec.hpp>
  27 #include <boost/preprocessor/tuple/elem.hpp>
  28 #include <boost/log/detail/config.hpp>
  29 #include <boost/log/detail/sfinae_tools.hpp>
  30 #include <boost/log/detail/header.hpp>
  31
  32 #ifdef BOOST_HAS_PRAGMA_ONCE
  33 #pragma once
  34 #endif
  35
  36 #ifndef BOOST_LOG_MAX_PARAMETER_ARGS
  37 //! The maximum number of named arguments that are accepted by constructors and functions
  38 #define BOOST_LOG_MAX_PARAMETER_ARGS 16
  39 #endif
  40
  41 // The macro applies the passed macro with the specified arguments BOOST_LOG_MAX_PARAMETER_ARGS times
  42 #define BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_GEN(macro, args)\
  43     public:\
  44         BOOST_PP_REPEAT_FROM_TO(1, BOOST_LOG_MAX_PARAMETER_ARGS, macro, args)
  45
  46 #define BOOST_LOG_CTOR_FORWARD_1(n, types)\
  47     template< typename T0 >\
  48     explicit BOOST_PP_TUPLE_ELEM(2, 0, types)(T0 const& arg0, typename boost::log::aux::enable_if_named_parameters< T0, boost::log::aux::sfinae_dummy >::type = boost::log::aux::sfinae_dummy()) :\
  49         BOOST_PP_TUPLE_ELEM(2, 1, types)((BOOST_PP_ENUM_PARAMS(n, arg))) {}
  50
  51 #define BOOST_LOG_CTOR_FORWARD_N(n, types)\
  52     template< BOOST_PP_ENUM_PARAMS(n, typename T) >\
  53     explicit BOOST_PP_TUPLE_ELEM(2, 0, types)(BOOST_PP_ENUM_BINARY_PARAMS(n, T, const& arg)) :\
  54         BOOST_PP_TUPLE_ELEM(2, 1, types)((BOOST_PP_ENUM_PARAMS(n, arg))) {}
  55
  56 #define BOOST_LOG_CTOR_FORWARD(z, n, types)\
  57     BOOST_PP_IF(BOOST_PP_EQUAL(n, 1), BOOST_LOG_CTOR_FORWARD_1, BOOST_LOG_CTOR_FORWARD_N)(n, types)
  58
  59 // The macro expands to a number of templated constructors that aggregate their named arguments
  60 // into an ArgumentsPack and pass it to the base class constructor.
  61 #define BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_FORWARD(class_type, base_type)\
  62     BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_GEN(BOOST_LOG_CTOR_FORWARD, (class_type, base_type))
  63
  64 #define BOOST_LOG_CTOR_CALL_1(n, types)\
  65     template< typename T0 >\
  66     explicit BOOST_PP_TUPLE_ELEM(2, 0, types)(T0 const& arg0, typename boost::log::aux::enable_if_named_parameters< T0, boost::log::aux::sfinae_dummy >::type = boost::log::aux::sfinae_dummy())\
  67     { BOOST_PP_TUPLE_ELEM(2, 1, types)((BOOST_PP_ENUM_PARAMS(n, arg))); }
  68
  69 #define BOOST_LOG_CTOR_CALL_N(n, types)\
  70     template< BOOST_PP_ENUM_PARAMS(n, typename T) >\
  71     explicit BOOST_PP_TUPLE_ELEM(2, 0, types)(BOOST_PP_ENUM_BINARY_PARAMS(n, T, const& arg))\
  72     { BOOST_PP_TUPLE_ELEM(2, 1, types)((BOOST_PP_ENUM_PARAMS(n, arg))); }
  73
  74 #define BOOST_LOG_CTOR_CALL(z, n, types)\
  75     BOOST_PP_IF(BOOST_PP_EQUAL(n, 1), BOOST_LOG_CTOR_CALL_1, BOOST_LOG_CTOR_CALL_N)(n, types)
  76
  77 // The macro expands to a number of templated constructors that aggregate their named arguments
  78 // into an ArgumentsPack and pass it to a function call.
  79 #define BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_CALL(class_type, fun)\
  80     BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_GEN(BOOST_LOG_CTOR_CALL, (class_type, fun))
  81
  82 namespace boost {
  83
  84 BOOST_LOG_OPEN_NAMESPACE
  85
  86 namespace aux {
  87
  88 // Yeah, not too cute. The empty_arg_list class should really be public.
  89 // https://svn.boost.org/trac/boost/ticket/7247
  90 typedef boost::parameter::aux::empty_arg_list empty_arg_list;
  91
  92 #if !(defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) || defined(BOOST_LOG_NO_CXX11_ARG_PACKS_TO_NON_VARIADIC_ARGS_EXPANSION))
  93
  94 //! The metafunction generates argument pack
  95 template< typename ArgT0, typename... ArgsT >
  96 struct make_arg_list
  97 {
  98     typedef boost::parameter::aux::arg_list< ArgT0, typename make_arg_list< ArgsT... >::type > type;
  99 };
 100
 101 template< typename ArgT0 >
 102 struct make_arg_list< ArgT0 >
 103 {
 104     typedef boost::parameter::aux::arg_list< ArgT0 > type;
 105 };
 106
 107 #else
 108
 109 //! The metafunction generates argument pack
 110 template< typename ArgT0, BOOST_PP_ENUM_BINARY_PARAMS(BOOST_PP_DEC(BOOST_LOG_MAX_PARAMETER_ARGS), typename T, = void BOOST_PP_INTERCEPT) >
 111 struct make_arg_list
 112 {
 113     typedef boost::parameter::aux::arg_list< ArgT0, typename make_arg_list< BOOST_PP_ENUM_PARAMS(BOOST_PP_DEC(BOOST_LOG_MAX_PARAMETER_ARGS), T) >::type > type;
 114 };
 115
 116 template< typename ArgT0 >
 117 struct make_arg_list< ArgT0, BOOST_PP_ENUM_PARAMS(BOOST_PP_DEC(BOOST_LOG_MAX_PARAMETER_ARGS), void BOOST_PP_INTERCEPT) >
 118 {
 119     typedef boost::parameter::aux::arg_list< ArgT0 > type;
 120 };
 121
 122 #endif
 123
 124 template< typename T, typename R >
 125 struct enable_if_named_parameters {};
 126
 127 template< typename R >
 128 struct enable_if_named_parameters< empty_arg_list, R >
 129 {
 130     typedef R type;
 131 };
 132
 133 template< typename Keyword, typename Arg, typename R >
 134 struct enable_if_named_parameters< boost::parameter::aux::tagged_argument< Keyword, Arg >, R >
 135 {
 136     typedef R type;
 137 };
 138
 139 template< typename TaggedArg, typename Next, typename R >
 140 struct enable_if_named_parameters< boost::parameter::aux::arg_list< TaggedArg, Next >, R >
 141 {
 142     typedef R type;
 143 };
 144
 145 } // namespace aux
 146
 147 BOOST_LOG_CLOSE_NAMESPACE // namespace log
 148
 149 } // namespace boost
 150
 151 #include <boost/log/detail/footer.hpp>
 152
 153 #endif // BOOST_LOG_DETAIL_PARAMETER_TOOLS_HPP_INCLUDED_