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_ 151