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_ 154