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
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
#if !defined(BOOST_PP_IS_ITERATING)
///// header body
//-----------------------------------------------------------------------------
// boost variant/detail/substitute.hpp header file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2003
// Eric Friedman
//
// 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_VARIANT_DETAIL_SUBSTITUTE_HPP
#define BOOST_VARIANT_DETAIL_SUBSTITUTE_HPP
#include "boost/mpl/aux_/config/ctps.hpp"
#include "boost/variant/detail/substitute_fwd.hpp"
#include "boost/mpl/aux_/lambda_arity_param.hpp"
#include "boost/mpl/aux_/preprocessor/params.hpp"
#include "boost/mpl/aux_/preprocessor/repeat.hpp"
#include "boost/mpl/int_fwd.hpp"
#include "boost/mpl/limits/arity.hpp"
#include "boost/preprocessor/cat.hpp"
#include "boost/preprocessor/empty.hpp"
#include "boost/preprocessor/arithmetic/inc.hpp"
#include "boost/preprocessor/iterate.hpp"
namespace boost {
namespace detail { namespace variant {
#if !defined(BOOST_VARIANT_DETAIL_NO_SUBSTITUTE)
///////////////////////////////////////////////////////////////////////////////
// (detail) metafunction substitute
//
// Substitutes one type for another in the given type expression.
//
//
// primary template
//
template <
typename T, typename Dest, typename Source
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(
typename Arity /* = ... (see substitute_fwd.hpp) */
)
>
struct substitute
{
typedef T type;
};
//
// tag substitution specializations
//
#define BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG(CV_) \
template <typename Dest, typename Source> \
struct substitute< \
CV_ Source \
, Dest \
, Source \
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>) \
> \
{ \
typedef CV_ Dest type; \
}; \
/**/
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG( BOOST_PP_EMPTY() )
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG(const)
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG(volatile)
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG(const volatile)
#undef BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG
//
// pointer specializations
//
#define BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER(CV_) \
template <typename T, typename Dest, typename Source> \
struct substitute< \
T * CV_ \
, Dest \
, Source \
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>) \
> \
{ \
typedef typename substitute< \
T, Dest, Source \
>::type * CV_ type; \
}; \
/**/
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER( BOOST_PP_EMPTY() )
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER(const)
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER(volatile)
BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER(const volatile)
#undef BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER
//
// reference specializations
//
template <typename T, typename Dest, typename Source>
struct substitute<
T&
, Dest
, Source
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>)
>
{
typedef typename substitute<
T, Dest, Source
>::type & type;
};
//
// template expression (i.e., F<...>) specializations
//
#define BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF_IMPL(N) \
typedef typename substitute< \
BOOST_PP_CAT(U,N), Dest, Source \
>::type BOOST_PP_CAT(u,N); \
/**/
#define BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF(z, N, _) \
BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF_IMPL( BOOST_PP_INC(N) ) \
/**/
#define BOOST_PP_ITERATION_LIMITS (0,BOOST_MPL_LIMIT_METAFUNCTION_ARITY)
#define BOOST_PP_FILENAME_1 "boost/variant/detail/substitute.hpp"
#include BOOST_PP_ITERATE()
#undef BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF_IMPL
#undef BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF
#endif // !defined(BOOST_VARIANT_DETAIL_NO_SUBSTITUTE)
}} // namespace detail::variant
} // namespace boost
#endif // BOOST_VARIANT_DETAIL_SUBSTITUTE_HPP
///// iteration, depth == 1
#elif BOOST_PP_ITERATION_DEPTH() == 1
#define i BOOST_PP_FRAME_ITERATION(1)
#if i > 0
//
// template specializations
//
template <
template < BOOST_MPL_PP_PARAMS(i,typename P) > class T
, BOOST_MPL_PP_PARAMS(i,typename U)
, typename Dest
, typename Source
>
struct substitute<
T< BOOST_MPL_PP_PARAMS(i,U) >
, Dest
, Source
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<( i )>)
>
{
private:
BOOST_MPL_PP_REPEAT(i, BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF, _)
public:
typedef T< BOOST_MPL_PP_PARAMS(i,u) > type;
};
//
// function specializations
//
template <
typename R
, BOOST_MPL_PP_PARAMS(i,typename U)
, typename Dest
, typename Source
>
struct substitute<
R (*)( BOOST_MPL_PP_PARAMS(i,U) )
, Dest
, Source
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>)
>
{
private:
typedef typename substitute< R, Dest, Source >::type r;
BOOST_MPL_PP_REPEAT(i, BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF, _)
public:
typedef r (*type)( BOOST_MPL_PP_PARAMS(i,u) );
};
#elif i == 0
//
// zero-arg function specialization
//
template <
typename R, typename Dest, typename Source
>
struct substitute<
R (*)( void )
, Dest
, Source
BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>)
>
{
private:
typedef typename substitute< R, Dest, Source >::type r;
public:
typedef r (*type)( void );
};
#endif // i
#undef i
#endif // BOOST_PP_IS_ITERATING
|
Swift