1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
// Copyright David Abrahams, Daniel Wallin 2003.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PARAMETER_AUX_PACK_DEDUCE_TAG_HPP
#define BOOST_PARAMETER_AUX_PACK_DEDUCE_TAG_HPP
namespace boost { namespace parameter { namespace aux {
template <
typename Argument
, typename ArgumentPack
, typename DeducedArgs
, typename UsedArgs
, typename TagFn
, typename EmitsErrors
>
struct deduce_tag;
}}} // namespace boost::parameter::aux
#include <boost/parameter/aux_/lambda_tag.hpp>
#include <boost/parameter/config.hpp>
#include <boost/mpl/apply_wrap.hpp>
#include <boost/mpl/lambda.hpp>
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
namespace boost { namespace parameter { namespace aux {
template <typename Predicate, typename Argument, typename ArgumentPack>
struct deduce_tag_condition_mpl
: ::boost::mpl::apply_wrap2<
typename ::boost::mpl::lambda<
Predicate
, ::boost::parameter::aux::lambda_tag
>::type
, Argument
, ArgumentPack
>
{
};
}}} // namespace boost::parameter::aux
#include <boost/parameter/aux_/has_nested_template_fn.hpp>
#include <boost/mp11/list.hpp>
#include <boost/mp11/utility.hpp>
namespace boost { namespace parameter { namespace aux {
template <typename Predicate, typename Argument, typename ArgumentPack>
struct deduce_tag_condition_mp11
{
using type = ::boost::mp11::mp_apply_q<
Predicate
, ::boost::mp11::mp_list<Argument,ArgumentPack>
>;
};
template <typename Predicate, typename Argument, typename ArgumentPack>
using deduce_tag_condition = ::boost::mp11::mp_if<
::boost::parameter::aux::has_nested_template_fn<Predicate>
, ::boost::parameter::aux
::deduce_tag_condition_mp11<Predicate,Argument,ArgumentPack>
, ::boost::parameter::aux
::deduce_tag_condition_mpl<Predicate,Argument,ArgumentPack>
>;
}}} // namespace boost::parameter::aux
#else
#include <boost/mpl/bool.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/assert.hpp>
#endif // BOOST_PARAMETER_CAN_USE_MP11
#include <boost/parameter/aux_/set.hpp>
#include <boost/parameter/aux_/pack/tag_type.hpp>
#include <boost/parameter/aux_/pack/tag_deduced.hpp>
namespace boost { namespace parameter { namespace aux {
// Helper for deduce_tag<...>, below.
template <
typename Argument
, typename ArgumentPack
, typename DeducedArgs
, typename UsedArgs
, typename TagFn
, typename EmitsErrors
>
class deduce_tag0
{
typedef typename DeducedArgs::spec _spec;
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
typedef typename ::boost::parameter::aux::deduce_tag_condition<
typename _spec::predicate
#else
typedef typename ::boost::mpl::apply_wrap2<
typename ::boost::mpl::lambda<
typename _spec::predicate
, ::boost::parameter::aux::lambda_tag
>::type
#endif
, Argument
, ArgumentPack
>::type _condition;
#if !defined(BOOST_PARAMETER_CAN_USE_MP11)
// Deduced parameter matches several arguments.
BOOST_MPL_ASSERT((
typename ::boost::mpl::eval_if<
typename ::boost::parameter::aux::has_key_<
UsedArgs
, typename ::boost::parameter::aux::tag_type<_spec>::type
>::type
, ::boost::mpl::eval_if<
_condition
, ::boost::mpl::if_<
EmitsErrors
, ::boost::mpl::false_
, ::boost::mpl::true_
>
, ::boost::mpl::true_
>
, ::boost::mpl::true_
>::type
));
#endif // BOOST_PARAMETER_CAN_USE_MP11
public:
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
using type = typename ::boost::mp11::mp_if<
#else
typedef typename ::boost::mpl::eval_if<
#endif
_condition
, ::boost::parameter::aux
::tag_deduced<UsedArgs,_spec,Argument,TagFn>
, ::boost::parameter::aux::deduce_tag<
Argument
, ArgumentPack
, typename DeducedArgs::tail
, UsedArgs
, TagFn
, EmitsErrors
>
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
>::type;
#else
>::type type;
#endif
};
}}} // namespace boost::parameter::aux
#include <boost/parameter/aux_/void.hpp>
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
#include <type_traits>
#else
#include <boost/mpl/pair.hpp>
#include <boost/type_traits/is_same.hpp>
#endif
namespace boost { namespace parameter { namespace aux {
// Tries to deduced a keyword tag for a given Argument.
// Returns an mpl::pair<> consisting of the tagged_argument<>,
// and an mpl::set<> where the new tag has been inserted.
//
// Argument: The argument type to be tagged.
//
// ArgumentPack: The ArgumentPack built so far.
//
// DeducedArgs: A specialization of deduced_item<> (see below).
// A list containing only the deduced ParameterSpecs.
//
// UsedArgs: An mpl::set<> containing the keyword tags used so far.
//
// TagFn: A metafunction class used to tag positional or deduced
// arguments with a keyword tag.
template <
typename Argument
, typename ArgumentPack
, typename DeducedArgs
, typename UsedArgs
, typename TagFn
, typename EmitsErrors
>
struct deduce_tag
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
: ::boost::mp11::mp_if<
::std::is_same<DeducedArgs,::boost::parameter::void_>
, ::boost::mp11::mp_identity<
::boost::mp11::mp_list< ::boost::parameter::void_,UsedArgs>
>
#else
: ::boost::mpl::eval_if<
::boost::is_same<DeducedArgs,::boost::parameter::void_>
, ::boost::mpl::pair< ::boost::parameter::void_,UsedArgs>
#endif
, ::boost::parameter::aux::deduce_tag0<
Argument
, ArgumentPack
, DeducedArgs
, UsedArgs
, TagFn
, EmitsErrors
>
>
{
};
}}} // namespace boost::parameter::aux
#endif // include guard
|
