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
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
|
// Boost.TypeErasure library
//
// Copyright 2011 Steven Watanabe
//
// 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)
//
// $Id$
#if !defined(BOOST_PP_IS_ITERATING)
#ifndef BOOST_TYPE_ERASURE_CALLABLE_HPP_INCLUDED
#define BOOST_TYPE_ERASURE_CALLABLE_HPP_INCLUDED
#include <boost/detail/workaround.hpp>
#include <boost/utility/declval.hpp>
#include <boost/mpl/vector.hpp>
#include <boost/mpl/push_back.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/dec.hpp>
#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/preprocessor/repetition/enum.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
#include <boost/preprocessor/repetition/enum_binary_params.hpp>
#include <boost/preprocessor/repetition/enum_trailing_binary_params.hpp>
#include <boost/type_erasure/config.hpp>
#include <boost/type_erasure/call.hpp>
#include <boost/type_erasure/concept_interface.hpp>
#include <boost/type_erasure/rebind_any.hpp>
#include <boost/type_erasure/param.hpp>
namespace boost {
namespace type_erasure {
template<class Sig, class F = _self>
struct callable;
namespace detail {
template<class Sig>
struct result_of_callable;
}
#if defined(BOOST_TYPE_ERASURE_DOXYGEN)
/**
* The @ref callable concept allows an @ref any to hold function objects.
* @c Sig is interpreted in the same way as for Boost.Function, except
* that the arguments and return type are allowed to be placeholders.
* @c F must be a @ref placeholder.
*
* Multiple instances of @ref callable can be used
* simultaneously. Overload resolution works normally.
* Note that unlike Boost.Function, @ref callable
* does not provide result_type. It does, however,
* support @c boost::result_of.
*/
template<class Sig, class F = _self>
struct callable
{
/**
* @c R is the result type of @c Sig and @c T is the argument
* types of @c Sig.
*/
static R apply(F& f, T... arg);
};
#elif !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && \
!defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \
!BOOST_WORKAROUND(BOOST_MSVC, == 1800)
template<class R, class... T, class F>
struct callable<R(T...), F>
{
static R apply(F& f, T... arg)
{
return f(std::forward<T>(arg)...);
}
};
template<class... T, class F>
struct callable<void(T...), F>
{
static void apply(F& f, T... arg)
{
f(std::forward<T>(arg)...);
}
};
template<class R, class F, class Base, class Enable, class... T>
struct concept_interface<callable<R(T...), F>, Base, F, Enable>
: Base
{
template<class Sig>
struct result :
::boost::type_erasure::detail::result_of_callable<Sig>
{};
typedef void _boost_type_erasure_is_callable;
typedef ::boost::mpl::vector<R> _boost_type_erasure_callable_results;
typedef char (&_boost_type_erasure_callable_size)[1];
_boost_type_erasure_callable_size
_boost_type_erasure_deduce_callable(
typename ::boost::type_erasure::as_param<Base, T>::type...);
typename ::boost::type_erasure::rebind_any<Base, R>::type
operator()(typename ::boost::type_erasure::as_param<Base, T>::type... arg)
{
return ::boost::type_erasure::call(callable<R(T...), F>(), *this,
::std::forward<typename ::boost::type_erasure::as_param<Base, T>::type>(arg)...);
}
};
template<class R, class F, class Base, class Enable, class... T>
struct concept_interface<callable<R(T...), const F>, Base, F, Enable>
: Base
{
template<class Sig>
struct result :
::boost::type_erasure::detail::result_of_callable<Sig>
{};
typedef void _boost_type_erasure_is_callable;
typedef ::boost::mpl::vector<R> _boost_type_erasure_callable_results;
typedef char (&_boost_type_erasure_callable_size)[1];
_boost_type_erasure_callable_size
_boost_type_erasure_deduce_callable(
typename ::boost::type_erasure::as_param<Base, T>::type...) const;
typename ::boost::type_erasure::rebind_any<Base, R>::type operator()(
typename ::boost::type_erasure::as_param<Base, T>::type... arg) const
{
return ::boost::type_erasure::call(callable<R(T...), const F>(), *this,
::std::forward<typename ::boost::type_erasure::as_param<Base, T>::type>(arg)...);
}
};
template<class R, class F, class Base, class... T>
struct concept_interface<
callable<R(T...), F>,
Base,
F,
typename Base::_boost_type_erasure_is_callable
>
: Base
{
typedef typename ::boost::mpl::push_back<
typename Base::_boost_type_erasure_callable_results,
R
>::type _boost_type_erasure_callable_results;
typedef char (&_boost_type_erasure_callable_size)[
::boost::mpl::size<_boost_type_erasure_callable_results>::value];
using Base::_boost_type_erasure_deduce_callable;
_boost_type_erasure_callable_size
_boost_type_erasure_deduce_callable(
typename ::boost::type_erasure::as_param<Base, T>::type...);
using Base::operator();
typename ::boost::type_erasure::rebind_any<Base, R>::type
operator()(typename ::boost::type_erasure::as_param<Base, T>::type... arg)
{
return ::boost::type_erasure::call(callable<R(T...), F>(), *this,
::std::forward<typename ::boost::type_erasure::as_param<Base, T>::type>(arg)...);
}
};
template<class R, class F, class Base, class... T>
struct concept_interface<
callable<R(T...), const F>,
Base,
F,
typename Base::_boost_type_erasure_is_callable
>
: Base
{
typedef typename ::boost::mpl::push_back<
typename Base::_boost_type_erasure_callable_results,
R
>::type _boost_type_erasure_callable_results;
typedef char (&_boost_type_erasure_callable_size)[
::boost::mpl::size<_boost_type_erasure_callable_results>::value];
using Base::_boost_type_erasure_deduce_callable;
_boost_type_erasure_callable_size
_boost_type_erasure_deduce_callable(
typename ::boost::type_erasure::as_param<Base, T>::type...) const;
using Base::operator();
typename ::boost::type_erasure::rebind_any<Base, R>::type
operator()(typename ::boost::type_erasure::as_param<Base, T>::type... arg) const
{
return ::boost::type_erasure::call(callable<R(T...), const F>(), *this,
::std::forward<typename ::boost::type_erasure::as_param<Base, T>::type>(arg)...);
}
};
namespace detail {
template<class This, class... T>
struct result_of_callable<This(T...)>
{
typedef typename ::boost::mpl::at_c<
typename This::_boost_type_erasure_callable_results,
sizeof(::boost::declval<This>().
_boost_type_erasure_deduce_callable(::boost::declval<T>()...)) - 1
>::type type;
};
}
#else
/** INTERNAL ONLY */
#define BOOST_PP_FILENAME_1 <boost/type_erasure/callable.hpp>
/** INTERNAL ONLY */
#define BOOST_PP_ITERATION_LIMITS (0, BOOST_PP_DEC(BOOST_TYPE_ERASURE_MAX_ARITY))
#include BOOST_PP_ITERATE()
#endif
}
}
#endif
#else
#define N BOOST_PP_ITERATION()
#define BOOST_TYPE_ERASURE_DECLVAL(z, n, data) ::boost::declval<BOOST_PP_CAT(T, n)>()
#define BOOST_TYPE_ERASURE_REBIND(z, n, data)\
typename ::boost::type_erasure::as_param<Base, BOOST_PP_CAT(T, n)>::type BOOST_PP_CAT(arg, n)
#ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
#define BOOST_TYPE_ERASURE_FORWARD(z, n, data) BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM(2, 1, data), n)
#define BOOST_TYPE_ERASURE_FORWARD_REBIND(z, n, data) BOOST_PP_CAT(arg, n)
#else
#define BOOST_TYPE_ERASURE_FORWARD(z, n, data) ::std::forward<BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM(2, 0, data), n)>(BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM(2, 1, data), n))
#define BOOST_TYPE_ERASURE_FORWARD_REBIND(z, n, data) ::std::forward<typename ::boost::type_erasure::as_param<Base, BOOST_PP_CAT(T, n)>::type>(BOOST_PP_CAT(arg, n))
#endif
template<class R BOOST_PP_ENUM_TRAILING_PARAMS(N, class T), class F>
struct callable<R(BOOST_PP_ENUM_PARAMS(N, T)), F>
{
static R apply(F& f BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(N, T, arg))
{
return f(BOOST_PP_ENUM(N, BOOST_TYPE_ERASURE_FORWARD, (T, arg)));
}
};
template<BOOST_PP_ENUM_PARAMS(N, class T) BOOST_PP_COMMA_IF(N) class F>
struct callable<void(BOOST_PP_ENUM_PARAMS(N, T)), F>
{
static void apply(F& f BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(N, T, arg))
{
f(BOOST_PP_ENUM(N, BOOST_TYPE_ERASURE_FORWARD, (T, arg)));
}
};
template<class R BOOST_PP_ENUM_TRAILING_PARAMS(N, class T), class F, class Base, class Enable>
struct concept_interface<
callable<R(BOOST_PP_ENUM_PARAMS(N, T)), F>,
Base,
F,
Enable
>
: Base
{
template<class Sig>
struct result :
::boost::type_erasure::detail::result_of_callable<Sig>
{};
typedef void _boost_type_erasure_is_callable;
typedef ::boost::mpl::vector<R> _boost_type_erasure_callable_results;
typedef char (&_boost_type_erasure_callable_size)[1];
_boost_type_erasure_callable_size
_boost_type_erasure_deduce_callable(
BOOST_PP_ENUM(N, BOOST_TYPE_ERASURE_REBIND, ~));
typename ::boost::type_erasure::rebind_any<Base, R>::type
operator()(BOOST_PP_ENUM(N, BOOST_TYPE_ERASURE_REBIND, ~))
{
return ::boost::type_erasure::call(
callable<R(BOOST_PP_ENUM_PARAMS(N, T)), F>(),
*this BOOST_PP_ENUM_TRAILING(N, BOOST_TYPE_ERASURE_FORWARD_REBIND, ~));
}
};
template<class R BOOST_PP_ENUM_TRAILING_PARAMS(N, class T), class F, class Base, class Enable>
struct concept_interface<
callable<R(BOOST_PP_ENUM_PARAMS(N, T)), const F>,
Base,
F,
Enable
>
: Base
{
template<class Sig>
struct result :
::boost::type_erasure::detail::result_of_callable<Sig>
{};
typedef void _boost_type_erasure_is_callable;
typedef ::boost::mpl::vector<R> _boost_type_erasure_callable_results;
typedef char (&_boost_type_erasure_callable_size)[1];
_boost_type_erasure_callable_size
_boost_type_erasure_deduce_callable(
BOOST_PP_ENUM(N, BOOST_TYPE_ERASURE_REBIND, ~)) const;
typename ::boost::type_erasure::rebind_any<Base, R>::type
operator()(BOOST_PP_ENUM(N, BOOST_TYPE_ERASURE_REBIND, ~)) const
{
return ::boost::type_erasure::call(
callable<R(BOOST_PP_ENUM_PARAMS(N, T)), const F>(),
*this BOOST_PP_ENUM_TRAILING(N, BOOST_TYPE_ERASURE_FORWARD_REBIND, ~));
}
};
template<class R BOOST_PP_ENUM_TRAILING_PARAMS(N, class T), class F, class Base>
struct concept_interface<
callable<R(BOOST_PP_ENUM_PARAMS(N, T)), F>,
Base,
F,
typename Base::_boost_type_erasure_is_callable
>
: Base
{
typedef typename ::boost::mpl::push_back<
typename Base::_boost_type_erasure_callable_results,
R
>::type _boost_type_erasure_callable_results;
typedef char (&_boost_type_erasure_callable_size)[
::boost::mpl::size<_boost_type_erasure_callable_results>::value];
using Base::_boost_type_erasure_deduce_callable;
_boost_type_erasure_callable_size
_boost_type_erasure_deduce_callable(
BOOST_PP_ENUM(N, BOOST_TYPE_ERASURE_REBIND, ~));
using Base::operator();
typename ::boost::type_erasure::rebind_any<Base, R>::type
operator()(BOOST_PP_ENUM(N, BOOST_TYPE_ERASURE_REBIND, ~))
{
return ::boost::type_erasure::call(
callable<R(BOOST_PP_ENUM_PARAMS(N, T)), F>(),
*this BOOST_PP_ENUM_TRAILING(N, BOOST_TYPE_ERASURE_FORWARD_REBIND, ~));
}
};
template<class R BOOST_PP_ENUM_TRAILING_PARAMS(N, class T), class F, class Base>
struct concept_interface<
callable<R(BOOST_PP_ENUM_PARAMS(N, T)), const F>,
Base,
F,
typename Base::_boost_type_erasure_is_callable
>
: Base
{
typedef typename ::boost::mpl::push_back<
typename Base::_boost_type_erasure_callable_results,
R
>::type _boost_type_erasure_callable_results;
typedef char (&_boost_type_erasure_callable_size)[
::boost::mpl::size<_boost_type_erasure_callable_results>::value];
using Base::_boost_type_erasure_deduce_callable;
_boost_type_erasure_callable_size
_boost_type_erasure_deduce_callable(
BOOST_PP_ENUM(N, BOOST_TYPE_ERASURE_REBIND, ~)) const;
using Base::operator();
typename ::boost::type_erasure::rebind_any<Base, R>::type
operator()(BOOST_PP_ENUM(N, BOOST_TYPE_ERASURE_REBIND, ~)) const
{
return ::boost::type_erasure::call(
callable<R(BOOST_PP_ENUM_PARAMS(N, T)), const F>(),
*this BOOST_PP_ENUM_TRAILING(N, BOOST_TYPE_ERASURE_FORWARD_REBIND, ~));
}
};
namespace detail {
template<class This BOOST_PP_ENUM_TRAILING_PARAMS(N, class T)>
struct result_of_callable<This(BOOST_PP_ENUM_PARAMS(N, T))>
{
typedef typename ::boost::mpl::at_c<
typename This::_boost_type_erasure_callable_results,
sizeof(::boost::declval<This>().
_boost_type_erasure_deduce_callable(
BOOST_PP_ENUM(N, BOOST_TYPE_ERASURE_DECLVAL, ~))) - 1
>::type type;
};
}
#undef BOOST_TYPE_ERASURE_DECLVAL
#undef BOOST_TYPE_ERASURE_REBIND
#undef N
#endif
|
