ceph/src/boost/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/mpl/or.hpp>
  20 #include <boost/core/enable_if.hpp>
  21 #include <boost/parameter/keyword.hpp>
  22 #include <boost/type_traits/is_base_of.hpp>
  23 #include <boost/preprocessor/control/if.hpp>
  24 #include <boost/preprocessor/comparison/equal.hpp>
  25 #include <boost/preprocessor/repetition/enum_params.hpp>
  26 #include <boost/preprocessor/repetition/enum_binary_params.hpp>
  27 #include <boost/preprocessor/repetition/repeat_from_to.hpp>
  28 #include <boost/preprocessor/facilities/intercept.hpp>
  29 #include <boost/preprocessor/arithmetic/dec.hpp>
  30 #include <boost/preprocessor/tuple/elem.hpp>
  31 #include <boost/log/detail/config.hpp>
  32 #include <boost/log/detail/sfinae_tools.hpp>
  33 #include <boost/log/detail/header.hpp>
  34
  35 #ifdef BOOST_HAS_PRAGMA_ONCE
  36 #pragma once
  37 #endif
  38
  39 #ifndef BOOST_LOG_MAX_PARAMETER_ARGS
  40 //! The maximum number of named arguments that are accepted by constructors and functions
  41 #define BOOST_LOG_MAX_PARAMETER_ARGS 16
  42 #endif
  43
  44 // The macro applies the passed macro with the specified arguments BOOST_LOG_MAX_PARAMETER_ARGS times
  45 #define BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_GEN(macro, args)\
  46     public:\
  47         BOOST_PP_REPEAT_FROM_TO(1, BOOST_LOG_MAX_PARAMETER_ARGS, macro, args)
  48
  49 #define BOOST_LOG_CTOR_FORWARD_1(n, types)\
  50     template< typename T0 >\
  51     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()) :\
  52         BOOST_PP_TUPLE_ELEM(2, 1, types)((BOOST_PP_ENUM_PARAMS(n, arg))) {}
  53
  54 #define BOOST_LOG_CTOR_FORWARD_N(n, types)\
  55     template< BOOST_PP_ENUM_PARAMS(n, typename T) >\
  56     explicit BOOST_PP_TUPLE_ELEM(2, 0, types)(BOOST_PP_ENUM_BINARY_PARAMS(n, T, const& arg)) :\
  57         BOOST_PP_TUPLE_ELEM(2, 1, types)((BOOST_PP_ENUM_PARAMS(n, arg))) {}
  58
  59 #define BOOST_LOG_CTOR_FORWARD(z, n, types)\
  60     BOOST_PP_IF(BOOST_PP_EQUAL(n, 1), BOOST_LOG_CTOR_FORWARD_1, BOOST_LOG_CTOR_FORWARD_N)(n, types)
  61
  62 // The macro expands to a number of templated constructors that aggregate their named arguments
  63 // into an ArgumentsPack and pass it to the base class constructor.
  64 #define BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_FORWARD(class_type, base_type)\
  65     BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_GEN(BOOST_LOG_CTOR_FORWARD, (class_type, base_type))
  66
  67 #define BOOST_LOG_CTOR_CALL_1(n, types)\
  68     template< typename T0 >\
  69     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())\
  70     { BOOST_PP_TUPLE_ELEM(2, 1, types)((BOOST_PP_ENUM_PARAMS(n, arg))); }
  71
  72 #define BOOST_LOG_CTOR_CALL_N(n, types)\
  73     template< BOOST_PP_ENUM_PARAMS(n, typename T) >\
  74     explicit BOOST_PP_TUPLE_ELEM(2, 0, types)(BOOST_PP_ENUM_BINARY_PARAMS(n, T, const& arg))\
  75     { BOOST_PP_TUPLE_ELEM(2, 1, types)((BOOST_PP_ENUM_PARAMS(n, arg))); }
  76
  77 #define BOOST_LOG_CTOR_CALL(z, n, types)\
  78     BOOST_PP_IF(BOOST_PP_EQUAL(n, 1), BOOST_LOG_CTOR_CALL_1, BOOST_LOG_CTOR_CALL_N)(n, types)
  79
  80 // The macro expands to a number of templated constructors that aggregate their named arguments
  81 // into an ArgumentsPack and pass it to a function call.
  82 #define BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_CALL(class_type, fun)\
  83     BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_GEN(BOOST_LOG_CTOR_CALL, (class_type, fun))
  84
  85 namespace boost {
  86
  87 BOOST_LOG_OPEN_NAMESPACE
  88
  89 namespace aux {
  90
  91 // Yeah, not too cute. The empty_arg_list class should really be public.
  92 // https://svn.boost.org/trac/boost/ticket/7247
  93 typedef boost::parameter::aux::empty_arg_list empty_arg_list;
  94
  95 #if !(defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) || defined(BOOST_LOG_NO_CXX11_ARG_PACKS_TO_NON_VARIADIC_ARGS_EXPANSION))
  96
  97 //! The metafunction generates argument pack
  98 template< typename ArgT0, typename... ArgsT >
  99 struct make_arg_list
 100 {
 101     typedef boost::parameter::aux::arg_list< ArgT0, typename make_arg_list< ArgsT... >::type > type;
 102 };
 103
 104 template< typename ArgT0 >
 105 struct make_arg_list< ArgT0 >
 106 {
 107     typedef boost::parameter::aux::arg_list< ArgT0 > type;
 108 };
 109
 110 #else
 111
 112 //! The metafunction generates argument pack
 113 template< typename ArgT0, BOOST_PP_ENUM_BINARY_PARAMS(BOOST_PP_DEC(BOOST_LOG_MAX_PARAMETER_ARGS), typename T, = void BOOST_PP_INTERCEPT) >
 114 struct make_arg_list
 115 {
 116     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;
 117 };
 118
 119 template< typename ArgT0 >
 120 struct make_arg_list< ArgT0, BOOST_PP_ENUM_PARAMS(BOOST_PP_DEC(BOOST_LOG_MAX_PARAMETER_ARGS), void BOOST_PP_INTERCEPT) >
 121 {
 122     typedef boost::parameter::aux::arg_list< ArgT0 > type;
 123 };
 124
 125 #endif
 126
 127 #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
 128
 129 template< typename T, typename R >
 130 using enable_if_named_parameters = boost::enable_if_c< boost::mpl::or_< boost::is_base_of< boost::parameter::aux::tagged_argument_base, T >, boost::is_base_of< empty_arg_list, T > >::value, R >;
 131
 132 #else // !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
 133
 134 template< typename T, typename R >
 135 struct enable_if_named_parameters :
 136     public boost::enable_if_c< boost::mpl::or_< boost::is_base_of< boost::parameter::aux::tagged_argument_base, T >, boost::is_base_of< empty_arg_list, T > >::value, R >
 137 {
 138 };
 139
 140 #endif // !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
 141
 142 } // namespace aux
 143
 144 BOOST_LOG_CLOSE_NAMESPACE // namespace log
 145
 146 } // namespace boost
 147
 148 #include <boost/log/detail/footer.hpp>
 149
 150 #endif // BOOST_LOG_DETAIL_PARAMETER_TOOLS_HPP_INCLUDED_