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
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
|
/*
* Copyright Andrey Semashev 2007 - 2015.
* 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)
*/
template<
typename ResultT
BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(), typename ArgT)
>
class light_function< ResultT (BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), ArgT)) >
{
typedef light_function this_type;
BOOST_COPYABLE_AND_MOVABLE(this_type)
public:
typedef ResultT result_type;
private:
struct impl_base
{
typedef result_type (*invoke_type)(void* BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(), ArgT));
const invoke_type invoke;
typedef impl_base* (*clone_type)(const void*);
const clone_type clone;
typedef void (*destroy_type)(void*);
const destroy_type destroy;
impl_base(invoke_type inv, clone_type cl, destroy_type dstr) : invoke(inv), clone(cl), destroy(dstr)
{
}
BOOST_DELETED_FUNCTION(impl_base(impl_base const&))
BOOST_DELETED_FUNCTION(impl_base& operator= (impl_base const&))
};
#if !defined(BOOST_LOG_NO_MEMBER_TEMPLATE_FRIENDS)
template< typename FunT >
class impl;
template< typename FunT >
friend class impl;
#endif
template< typename FunT >
class impl :
public impl_base
{
typedef impl< FunT > this_type;
FunT m_Function;
public:
explicit impl(FunT const& fun) :
impl_base(&this_type::invoke_impl, &this_type::clone_impl, &this_type::destroy_impl),
m_Function(fun)
{
}
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
explicit impl(FunT&& fun) :
impl_base(&this_type::invoke_impl, &this_type::clone_impl, &this_type::destroy_impl),
m_Function(boost::move(fun))
{
}
#endif // !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
static void destroy_impl(void* self)
{
delete static_cast< impl* >(static_cast< impl_base* >(self));
}
static impl_base* clone_impl(const void* self)
{
return new impl(static_cast< const impl* >(static_cast< const impl_base* >(self))->m_Function);
}
static result_type invoke_impl(void* self BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(BOOST_PP_ITERATION(), ArgT, arg))
{
return static_cast< impl* >(static_cast< impl_base* >(self))->m_Function(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), arg));
}
BOOST_DELETED_FUNCTION(impl(impl const&))
BOOST_DELETED_FUNCTION(impl& operator= (impl const&))
};
private:
impl_base* m_pImpl;
public:
BOOST_CONSTEXPR light_function() BOOST_NOEXCEPT : m_pImpl(NULL)
{
}
light_function(this_type const& that)
{
if (that.m_pImpl)
m_pImpl = that.m_pImpl->clone(that.m_pImpl);
else
m_pImpl = NULL;
}
light_function(BOOST_RV_REF(this_type) that) BOOST_NOEXCEPT
{
m_pImpl = that.m_pImpl;
that.m_pImpl = NULL;
}
light_function(BOOST_RV_REF(const this_type) that) BOOST_NOEXCEPT
{
m_pImpl = that.m_pImpl;
((this_type&)that).m_pImpl = NULL;
}
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template< typename FunT >
light_function(FunT&& fun) :
m_pImpl(new impl< typename remove_cv< typename remove_reference< FunT >::type >::type >(boost::forward< FunT >(fun)))
{
}
#else
template< typename FunT >
light_function(FunT const& fun, typename disable_if_c< is_rv_or_same< FunT, this_type >::value, int >::type = 0) :
m_pImpl(new impl< FunT >(fun))
{
}
template< typename FunT >
light_function(BOOST_RV_REF(FunT) fun, typename disable_if_c< is_cv_same< FunT, this_type >::value, int >::type = 0) :
m_pImpl(new impl< typename remove_cv< FunT >::type >(fun))
{
}
#endif
//! Constructor from NULL
#if !defined(BOOST_NO_CXX11_NULLPTR)
BOOST_CONSTEXPR light_function(std::nullptr_t) BOOST_NOEXCEPT
#else
BOOST_CONSTEXPR light_function(int p) BOOST_NOEXCEPT
#endif
: m_pImpl(NULL)
{
#if defined(BOOST_NO_CXX11_NULLPTR)
BOOST_ASSERT(p == 0);
#endif
}
~light_function()
{
clear();
}
light_function& operator= (BOOST_RV_REF(this_type) that) BOOST_NOEXCEPT
{
this->swap(that);
return *this;
}
light_function& operator= (BOOST_COPY_ASSIGN_REF(this_type) that)
{
light_function tmp = static_cast< this_type const& >(that);
this->swap(tmp);
return *this;
}
//! Assignment of NULL
#if !defined(BOOST_NO_CXX11_NULLPTR)
light_function& operator= (std::nullptr_t)
#else
light_function& operator= (int p)
#endif
{
#if defined(BOOST_NO_CXX11_NULLPTR)
BOOST_ASSERT(p == 0);
#endif
clear();
return *this;
}
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template< typename FunT >
light_function& operator= (FunT&& fun)
{
light_function tmp(boost::forward< FunT >(fun));
this->swap(tmp);
return *this;
}
#else
template< typename FunT >
typename disable_if_c< is_rv_or_same< FunT, this_type >::value, this_type& >::type
operator= (FunT const& fun)
{
light_function tmp(fun);
this->swap(tmp);
return *this;
}
#endif
result_type operator() (BOOST_PP_ENUM_BINARY_PARAMS(BOOST_PP_ITERATION(), ArgT, arg)) const
{
return m_pImpl->invoke(m_pImpl BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(), arg));
}
BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT()
bool operator! () const BOOST_NOEXCEPT { return (m_pImpl == NULL); }
bool empty() const BOOST_NOEXCEPT { return (m_pImpl == NULL); }
void clear() BOOST_NOEXCEPT
{
if (m_pImpl)
{
m_pImpl->destroy(m_pImpl);
m_pImpl = NULL;
}
}
void swap(this_type& that) BOOST_NOEXCEPT
{
impl_base* p = m_pImpl;
m_pImpl = that.m_pImpl;
that.m_pImpl = p;
}
};
template<
BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), typename ArgT)
>
class light_function< void (BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), ArgT)) >
{
typedef light_function this_type;
BOOST_COPYABLE_AND_MOVABLE(this_type)
public:
typedef void result_type;
private:
struct impl_base
{
typedef void (*invoke_type)(void* BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(), ArgT));
const invoke_type invoke;
typedef impl_base* (*clone_type)(const void*);
const clone_type clone;
typedef void (*destroy_type)(void*);
const destroy_type destroy;
impl_base(invoke_type inv, clone_type cl, destroy_type dstr) : invoke(inv), clone(cl), destroy(dstr)
{
}
BOOST_DELETED_FUNCTION(impl_base(impl_base const&))
BOOST_DELETED_FUNCTION(impl_base& operator= (impl_base const&))
};
#if !defined(BOOST_LOG_NO_MEMBER_TEMPLATE_FRIENDS)
template< typename FunT >
class impl;
template< typename FunT >
friend class impl;
#endif
template< typename FunT >
class impl :
public impl_base
{
typedef impl< FunT > this_type;
FunT m_Function;
public:
explicit impl(FunT const& fun) :
impl_base(&this_type::invoke_impl, &this_type::clone_impl, &this_type::destroy_impl),
m_Function(fun)
{
}
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
explicit impl(FunT&& fun) :
impl_base(&this_type::invoke_impl, &this_type::clone_impl, &this_type::destroy_impl),
m_Function(boost::move(fun))
{
}
#endif // !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
static void destroy_impl(void* self)
{
delete static_cast< impl* >(static_cast< impl_base* >(self));
}
static impl_base* clone_impl(const void* self)
{
return new impl(static_cast< const impl* >(static_cast< const impl_base* >(self))->m_Function);
}
static result_type invoke_impl(void* self BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(BOOST_PP_ITERATION(), ArgT, arg))
{
static_cast< impl* >(static_cast< impl_base* >(self))->m_Function(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), arg));
}
BOOST_DELETED_FUNCTION(impl(impl const&))
BOOST_DELETED_FUNCTION(impl& operator= (impl const&))
};
private:
impl_base* m_pImpl;
public:
BOOST_CONSTEXPR light_function() BOOST_NOEXCEPT : m_pImpl(NULL)
{
}
light_function(this_type const& that)
{
if (that.m_pImpl)
m_pImpl = that.m_pImpl->clone(that.m_pImpl);
else
m_pImpl = NULL;
}
light_function(BOOST_RV_REF(this_type) that) BOOST_NOEXCEPT
{
m_pImpl = that.m_pImpl;
that.m_pImpl = NULL;
}
light_function(BOOST_RV_REF(const this_type) that) BOOST_NOEXCEPT
{
m_pImpl = that.m_pImpl;
((this_type&)that).m_pImpl = NULL;
}
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template< typename FunT >
light_function(FunT&& fun) :
m_pImpl(new impl< typename remove_cv< typename remove_reference< FunT >::type >::type >(boost::forward< FunT >(fun)))
{
}
#else
template< typename FunT >
light_function(FunT const& fun, typename disable_if_c< is_rv_or_same< FunT, this_type >::value, int >::type = 0) :
m_pImpl(new impl< FunT >(fun))
{
}
template< typename FunT >
light_function(BOOST_RV_REF(FunT) fun, typename disable_if_c< is_cv_same< FunT, this_type >::value, int >::type = 0) :
m_pImpl(new impl< typename remove_cv< FunT >::type >(fun))
{
}
#endif
//! Constructor from NULL
#if !defined(BOOST_NO_CXX11_NULLPTR)
BOOST_CONSTEXPR light_function(std::nullptr_t) BOOST_NOEXCEPT
#else
BOOST_CONSTEXPR light_function(int p) BOOST_NOEXCEPT
#endif
: m_pImpl(NULL)
{
#if defined(BOOST_NO_CXX11_NULLPTR)
BOOST_ASSERT(p == 0);
#endif
}
~light_function()
{
clear();
}
light_function& operator= (BOOST_RV_REF(this_type) that) BOOST_NOEXCEPT
{
this->swap(that);
return *this;
}
light_function& operator= (BOOST_COPY_ASSIGN_REF(this_type) that)
{
light_function tmp = static_cast< this_type const& >(that);
this->swap(tmp);
return *this;
}
//! Assignment of NULL
#if !defined(BOOST_NO_CXX11_NULLPTR)
light_function& operator= (std::nullptr_t)
#else
light_function& operator= (int p)
#endif
{
#if defined(BOOST_NO_CXX11_NULLPTR)
BOOST_ASSERT(p == 0);
#endif
clear();
return *this;
}
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template< typename FunT >
light_function& operator= (FunT&& fun)
{
light_function tmp(boost::forward< FunT >(fun));
this->swap(tmp);
return *this;
}
#else
template< typename FunT >
typename disable_if_c< is_rv_or_same< FunT, this_type >::value, this_type& >::type
operator= (FunT const& fun)
{
light_function tmp(fun);
this->swap(tmp);
return *this;
}
#endif
result_type operator() (BOOST_PP_ENUM_BINARY_PARAMS(BOOST_PP_ITERATION(), ArgT, arg)) const
{
m_pImpl->invoke(m_pImpl BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(), arg));
}
BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT()
bool operator! () const BOOST_NOEXCEPT { return (m_pImpl == NULL); }
bool empty() const BOOST_NOEXCEPT { return (m_pImpl == NULL); }
void clear() BOOST_NOEXCEPT
{
if (m_pImpl)
{
m_pImpl->destroy(m_pImpl);
m_pImpl = NULL;
}
}
void swap(this_type& that) BOOST_NOEXCEPT
{
impl_base* p = m_pImpl;
m_pImpl = that.m_pImpl;
that.m_pImpl = p;
}
};
|
