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(z, 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_Z(z, n, arg))) {}
53
54#define BOOST_LOG_CTOR_FORWARD_N(z, n, types)\
55 template< BOOST_PP_ENUM_PARAMS_Z(z, n, typename T) >\
56 explicit BOOST_PP_TUPLE_ELEM(2, 0, types)(BOOST_PP_ENUM_BINARY_PARAMS_Z(z, n, T, const& arg)) :\
57 BOOST_PP_TUPLE_ELEM(2, 1, types)((BOOST_PP_ENUM_PARAMS_Z(z, 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)(z, 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(z, 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_Z(z, n, arg))); }
71
72#define BOOST_LOG_CTOR_CALL_N(z, n, types)\
73 template< BOOST_PP_ENUM_PARAMS_Z(z, n, typename T) >\
74 explicit BOOST_PP_TUPLE_ELEM(2, 0, types)(BOOST_PP_ENUM_BINARY_PARAMS_Z(z, n, T, const& arg))\
75 { BOOST_PP_TUPLE_ELEM(2, 1, types)((BOOST_PP_ENUM_PARAMS_Z(z, 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)(z, 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
85namespace boost {
86
87BOOST_LOG_OPEN_NAMESPACE
88
89namespace 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
93typedef 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
98template< typename ArgT0, typename... ArgsT >
99struct make_arg_list
100{
101 typedef boost::parameter::aux::arg_list< ArgT0, typename make_arg_list< ArgsT... >::type > type;
102};
103
104template< typename ArgT0 >
105struct 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
113template< typename ArgT0, BOOST_PP_ENUM_BINARY_PARAMS(BOOST_PP_DEC(BOOST_LOG_MAX_PARAMETER_ARGS), typename T, = void BOOST_PP_INTERCEPT) >
114struct 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
119template< typename ArgT0 >
120struct 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
129template< typename T, typename R >
130using 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
134template< typename T, typename R >
135struct 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
144BOOST_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

source code of boost/libs/log/include/boost/log/detail/parameter_tools.hpp