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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 light_function.hpp | |
9 | * \author Andrey Semashev | |
10 | * \date 20.06.2010 | |
11 | * | |
12 | * \brief This header is the Boost.Log library impl, see the library documentation | |
13 | * at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html. | |
14 | * | |
15 | * The file contains a lightweight alternative of Boost.Function. It does not provide all | |
16 | * features of Boost.Function but doesn't introduce dependency on Boost.Bind. | |
17 | */ | |
18 | ||
19 | #ifndef BOOST_LOG_DETAIL_LIGHT_FUNCTION_HPP_INCLUDED_ | |
20 | #define BOOST_LOG_DETAIL_LIGHT_FUNCTION_HPP_INCLUDED_ | |
21 | ||
22 | #include <cstddef> | |
23 | #include <boost/move/core.hpp> | |
24 | #include <boost/move/utility_core.hpp> | |
25 | #include <boost/log/detail/config.hpp> | |
26 | #include <boost/utility/explicit_operator_bool.hpp> | |
27 | #include <boost/type_traits/remove_cv.hpp> | |
28 | #if defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) | |
29 | #include <boost/preprocessor/iteration/iterate.hpp> | |
30 | #include <boost/preprocessor/repetition/enum_params.hpp> | |
31 | #include <boost/preprocessor/repetition/enum_binary_params.hpp> | |
32 | #include <boost/preprocessor/repetition/enum_trailing_params.hpp> | |
33 | #include <boost/preprocessor/repetition/enum_trailing_binary_params.hpp> | |
34 | #endif | |
35 | #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
36 | #include <boost/log/detail/sfinae_tools.hpp> | |
37 | #else | |
38 | #include <boost/type_traits/remove_reference.hpp> | |
39 | #endif | |
40 | #if defined(BOOST_NO_CXX11_NULLPTR) | |
41 | #include <boost/assert.hpp> | |
42 | #endif | |
43 | #include <boost/log/detail/header.hpp> | |
44 | ||
45 | #ifdef BOOST_HAS_PRAGMA_ONCE | |
46 | #pragma once | |
47 | #endif | |
48 | ||
49 | #ifndef BOOST_LOG_LIGHT_FUNCTION_LIMIT | |
50 | #define BOOST_LOG_LIGHT_FUNCTION_LIMIT 2 | |
51 | #endif | |
52 | ||
53 | namespace boost { | |
54 | ||
55 | BOOST_LOG_OPEN_NAMESPACE | |
56 | ||
57 | namespace aux { | |
58 | ||
59 | #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
60 | ||
61 | template< typename T, typename ThisT > | |
62 | struct is_cv_same { enum _ { value = false }; }; | |
63 | template< typename T > | |
64 | struct is_cv_same< T, T > { enum _ { value = true }; }; | |
65 | template< typename T > | |
66 | struct is_cv_same< T, const T > { enum _ { value = true }; }; | |
67 | template< typename T > | |
68 | struct is_cv_same< T, volatile T > { enum _ { value = true }; }; | |
69 | template< typename T > | |
70 | struct is_cv_same< T, const volatile T > { enum _ { value = true }; }; | |
71 | ||
72 | template< typename T, typename ThisT > | |
73 | struct is_rv_or_same { enum _ { value = false }; }; | |
74 | template< typename T > | |
75 | struct is_rv_or_same< T, T > { enum _ { value = true }; }; | |
76 | template< typename T, typename ThisT > | |
77 | struct is_rv_or_same< boost::rv< T >, ThisT > { enum _ { value = true }; }; | |
78 | ||
79 | #endif | |
80 | ||
81 | template< typename SignatureT > | |
82 | class light_function; | |
83 | ||
84 | #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) | |
85 | ||
86 | template< typename ResultT, typename... ArgsT > | |
87 | class light_function< ResultT (ArgsT...) > | |
88 | { | |
89 | typedef light_function this_type; | |
90 | BOOST_COPYABLE_AND_MOVABLE(this_type) | |
91 | ||
92 | public: | |
93 | typedef ResultT result_type; | |
94 | ||
95 | private: | |
96 | struct impl_base | |
97 | { | |
98 | typedef result_type (*invoke_type)(void*, ArgsT...); | |
99 | const invoke_type invoke; | |
100 | ||
101 | typedef impl_base* (*clone_type)(const void*); | |
102 | const clone_type clone; | |
103 | ||
104 | typedef void (*destroy_type)(void*); | |
105 | const destroy_type destroy; | |
106 | ||
107 | impl_base(invoke_type inv, clone_type cl, destroy_type dstr) : invoke(inv), clone(cl), destroy(dstr) | |
108 | { | |
109 | } | |
110 | ||
111 | BOOST_DELETED_FUNCTION(impl_base(impl_base const&)) | |
112 | BOOST_DELETED_FUNCTION(impl_base& operator= (impl_base const&)) | |
113 | }; | |
114 | ||
115 | #if !defined(BOOST_LOG_NO_MEMBER_TEMPLATE_FRIENDS) | |
116 | template< typename FunT > | |
117 | class impl; | |
118 | template< typename FunT > | |
119 | friend class impl; | |
120 | #endif | |
121 | ||
122 | template< typename FunT > | |
123 | class impl : | |
124 | public impl_base | |
125 | { | |
126 | typedef impl< FunT > this_type; | |
127 | ||
128 | FunT m_Function; | |
129 | ||
130 | public: | |
131 | explicit impl(FunT const& fun) : | |
132 | impl_base(&this_type::invoke_impl, &this_type::clone_impl, &this_type::destroy_impl), | |
133 | m_Function(fun) | |
134 | { | |
135 | } | |
136 | ||
137 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
138 | explicit impl(FunT&& fun) : | |
139 | impl_base(&this_type::invoke_impl, &this_type::clone_impl, &this_type::destroy_impl), | |
140 | m_Function(boost::move(fun)) | |
141 | { | |
142 | } | |
143 | #endif // !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
144 | ||
145 | static void destroy_impl(void* self) | |
146 | { | |
147 | delete static_cast< impl* >(static_cast< impl_base* >(self)); | |
148 | } | |
149 | static impl_base* clone_impl(const void* self) | |
150 | { | |
151 | return new impl(static_cast< const impl* >(static_cast< const impl_base* >(self))->m_Function); | |
152 | } | |
153 | static result_type invoke_impl(void* self, ArgsT... args) | |
154 | { | |
155 | return static_cast< impl* >(static_cast< impl_base* >(self))->m_Function(args...); | |
156 | } | |
157 | ||
158 | BOOST_DELETED_FUNCTION(impl(impl const&)) | |
159 | BOOST_DELETED_FUNCTION(impl& operator= (impl const&)) | |
160 | }; | |
161 | ||
162 | private: | |
163 | impl_base* m_pImpl; | |
164 | ||
165 | public: | |
166 | BOOST_CONSTEXPR light_function() BOOST_NOEXCEPT : m_pImpl(NULL) | |
167 | { | |
168 | } | |
169 | light_function(this_type const& that) | |
170 | { | |
171 | if (that.m_pImpl) | |
172 | m_pImpl = that.m_pImpl->clone(that.m_pImpl); | |
173 | else | |
174 | m_pImpl = NULL; | |
175 | } | |
176 | ||
177 | light_function(BOOST_RV_REF(this_type) that) BOOST_NOEXCEPT | |
178 | { | |
179 | m_pImpl = that.m_pImpl; | |
180 | that.m_pImpl = NULL; | |
181 | } | |
182 | ||
183 | light_function(BOOST_RV_REF(const this_type) that) BOOST_NOEXCEPT | |
184 | { | |
185 | m_pImpl = that.m_pImpl; | |
186 | ((this_type&)that).m_pImpl = NULL; | |
187 | } | |
188 | ||
189 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
190 | template< typename FunT > | |
191 | light_function(FunT&& fun) : | |
192 | m_pImpl(new impl< typename remove_cv< typename remove_reference< FunT >::type >::type >(boost::forward< FunT >(fun))) | |
193 | { | |
194 | } | |
195 | #else | |
196 | template< typename FunT > | |
197 | light_function(FunT const& fun, typename boost::disable_if_c< is_rv_or_same< FunT, this_type >::value, boost::log::aux::sfinae_dummy >::type = boost::log::aux::sfinae_dummy()) : | |
198 | m_pImpl(new impl< FunT >(fun)) | |
199 | { | |
200 | } | |
201 | template< typename FunT > | |
202 | light_function(BOOST_RV_REF(FunT) fun, typename boost::disable_if_c< is_cv_same< FunT, this_type >::value, boost::log::aux::sfinae_dummy >::type = boost::log::aux::sfinae_dummy()) : | |
203 | m_pImpl(new impl< typename remove_cv< FunT >::type >(fun)) | |
204 | { | |
205 | } | |
206 | #endif | |
207 | ||
208 | //! Constructor from NULL | |
209 | #if !defined(BOOST_NO_CXX11_NULLPTR) | |
210 | BOOST_CONSTEXPR light_function(std::nullptr_t) BOOST_NOEXCEPT | |
211 | #else | |
212 | BOOST_CONSTEXPR light_function(int p) BOOST_NOEXCEPT | |
213 | #endif | |
214 | : m_pImpl(NULL) | |
215 | { | |
216 | #if defined(BOOST_NO_CXX11_NULLPTR) | |
217 | BOOST_ASSERT(p == 0); | |
218 | #endif | |
219 | } | |
220 | ~light_function() | |
221 | { | |
222 | clear(); | |
223 | } | |
224 | ||
225 | light_function& operator= (BOOST_RV_REF(this_type) that) BOOST_NOEXCEPT | |
226 | { | |
227 | this->swap(that); | |
228 | return *this; | |
229 | } | |
230 | light_function& operator= (BOOST_COPY_ASSIGN_REF(this_type) that) | |
231 | { | |
232 | light_function tmp = static_cast< this_type const& >(that); | |
233 | this->swap(tmp); | |
234 | return *this; | |
235 | } | |
236 | //! Assignment of NULL | |
237 | #if !defined(BOOST_NO_CXX11_NULLPTR) | |
238 | light_function& operator= (std::nullptr_t) | |
239 | #else | |
240 | light_function& operator= (int p) | |
241 | #endif | |
242 | { | |
243 | #if defined(BOOST_NO_CXX11_NULLPTR) | |
244 | BOOST_ASSERT(p == 0); | |
245 | #endif | |
246 | clear(); | |
247 | return *this; | |
248 | } | |
249 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
250 | template< typename FunT > | |
251 | light_function& operator= (FunT&& fun) | |
252 | { | |
253 | light_function tmp(boost::forward< FunT >(fun)); | |
254 | this->swap(tmp); | |
255 | return *this; | |
256 | } | |
257 | #else | |
258 | template< typename FunT > | |
259 | typename boost::disable_if_c< is_rv_or_same< FunT, this_type >::value, this_type& >::type | |
260 | operator= (FunT const& fun) | |
261 | { | |
262 | light_function tmp(fun); | |
263 | this->swap(tmp); | |
264 | return *this; | |
265 | } | |
266 | #endif | |
267 | ||
268 | result_type operator() (ArgsT... args) const | |
269 | { | |
270 | return m_pImpl->invoke(m_pImpl, args...); | |
271 | } | |
272 | ||
273 | BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT() | |
274 | bool operator! () const BOOST_NOEXCEPT { return (m_pImpl == NULL); } | |
275 | bool empty() const BOOST_NOEXCEPT { return (m_pImpl == NULL); } | |
276 | void clear() BOOST_NOEXCEPT | |
277 | { | |
278 | if (m_pImpl) | |
279 | { | |
280 | m_pImpl->destroy(m_pImpl); | |
281 | m_pImpl = NULL; | |
282 | } | |
283 | } | |
284 | ||
285 | void swap(this_type& that) BOOST_NOEXCEPT | |
286 | { | |
287 | impl_base* p = m_pImpl; | |
288 | m_pImpl = that.m_pImpl; | |
289 | that.m_pImpl = p; | |
290 | } | |
291 | }; | |
292 | ||
293 | template< typename... ArgsT > | |
294 | class light_function< void (ArgsT...) > | |
295 | { | |
296 | typedef light_function this_type; | |
297 | BOOST_COPYABLE_AND_MOVABLE(this_type) | |
298 | ||
299 | public: | |
300 | typedef void result_type; | |
301 | ||
302 | private: | |
303 | struct impl_base | |
304 | { | |
305 | typedef void (*invoke_type)(void*, ArgsT...); | |
306 | const invoke_type invoke; | |
307 | ||
308 | typedef impl_base* (*clone_type)(const void*); | |
309 | const clone_type clone; | |
310 | ||
311 | typedef void (*destroy_type)(void*); | |
312 | const destroy_type destroy; | |
313 | ||
314 | impl_base(invoke_type inv, clone_type cl, destroy_type dstr) : invoke(inv), clone(cl), destroy(dstr) | |
315 | { | |
316 | } | |
317 | ||
318 | BOOST_DELETED_FUNCTION(impl_base(impl_base const&)) | |
319 | BOOST_DELETED_FUNCTION(impl_base& operator= (impl_base const&)) | |
320 | }; | |
321 | ||
322 | #if !defined(BOOST_LOG_NO_MEMBER_TEMPLATE_FRIENDS) | |
323 | template< typename FunT > | |
324 | class impl; | |
325 | template< typename FunT > | |
326 | friend class impl; | |
327 | #endif | |
328 | ||
329 | template< typename FunT > | |
330 | class impl : | |
331 | public impl_base | |
332 | { | |
333 | typedef impl< FunT > this_type; | |
334 | ||
335 | FunT m_Function; | |
336 | ||
337 | public: | |
338 | explicit impl(FunT const& fun) : | |
339 | impl_base(&this_type::invoke_impl, &this_type::clone_impl, &this_type::destroy_impl), | |
340 | m_Function(fun) | |
341 | { | |
342 | } | |
343 | ||
344 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
345 | explicit impl(FunT&& fun) : | |
346 | impl_base(&this_type::invoke_impl, &this_type::clone_impl, &this_type::destroy_impl), | |
347 | m_Function(boost::move(fun)) | |
348 | { | |
349 | } | |
350 | #endif // !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
351 | ||
352 | static void destroy_impl(void* self) | |
353 | { | |
354 | delete static_cast< impl* >(static_cast< impl_base* >(self)); | |
355 | } | |
356 | static impl_base* clone_impl(const void* self) | |
357 | { | |
358 | return new impl(static_cast< const impl* >(static_cast< const impl_base* >(self))->m_Function); | |
359 | } | |
360 | static result_type invoke_impl(void* self, ArgsT... args) | |
361 | { | |
362 | static_cast< impl* >(static_cast< impl_base* >(self))->m_Function(args...); | |
363 | } | |
364 | ||
365 | BOOST_DELETED_FUNCTION(impl(impl const&)) | |
366 | BOOST_DELETED_FUNCTION(impl& operator= (impl const&)) | |
367 | }; | |
368 | ||
369 | private: | |
370 | impl_base* m_pImpl; | |
371 | ||
372 | public: | |
373 | BOOST_CONSTEXPR light_function() BOOST_NOEXCEPT : m_pImpl(NULL) | |
374 | { | |
375 | } | |
376 | light_function(this_type const& that) | |
377 | { | |
378 | if (that.m_pImpl) | |
379 | m_pImpl = that.m_pImpl->clone(that.m_pImpl); | |
380 | else | |
381 | m_pImpl = NULL; | |
382 | } | |
383 | light_function(BOOST_RV_REF(this_type) that) BOOST_NOEXCEPT | |
384 | { | |
385 | m_pImpl = that.m_pImpl; | |
386 | that.m_pImpl = NULL; | |
387 | } | |
388 | ||
389 | light_function(BOOST_RV_REF(const this_type) that) BOOST_NOEXCEPT | |
390 | { | |
391 | m_pImpl = that.m_pImpl; | |
392 | ((this_type&)that).m_pImpl = NULL; | |
393 | } | |
394 | ||
395 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
396 | template< typename FunT > | |
397 | light_function(FunT&& fun) : | |
398 | m_pImpl(new impl< typename remove_cv< typename remove_reference< FunT >::type >::type >(boost::forward< FunT >(fun))) | |
399 | { | |
400 | } | |
401 | #else | |
402 | template< typename FunT > | |
403 | light_function(FunT const& fun, typename boost::disable_if_c< is_rv_or_same< FunT, this_type >::value, boost::log::aux::sfinae_dummy >::type = boost::log::aux::sfinae_dummy()) : | |
404 | m_pImpl(new impl< FunT >(fun)) | |
405 | { | |
406 | } | |
407 | template< typename FunT > | |
408 | light_function(BOOST_RV_REF(FunT) fun, typename boost::disable_if_c< is_cv_same< FunT, this_type >::value, boost::log::aux::sfinae_dummy >::type = boost::log::aux::sfinae_dummy()) : | |
409 | m_pImpl(new impl< typename remove_cv< FunT >::type >(fun)) | |
410 | { | |
411 | } | |
412 | #endif | |
413 | ||
414 | //! Constructor from NULL | |
415 | #if !defined(BOOST_NO_CXX11_NULLPTR) | |
416 | BOOST_CONSTEXPR light_function(std::nullptr_t) BOOST_NOEXCEPT | |
417 | #else | |
418 | BOOST_CONSTEXPR light_function(int p) BOOST_NOEXCEPT | |
419 | #endif | |
420 | : m_pImpl(NULL) | |
421 | { | |
422 | #if defined(BOOST_NO_CXX11_NULLPTR) | |
423 | BOOST_ASSERT(p == 0); | |
424 | #endif | |
425 | } | |
426 | ~light_function() | |
427 | { | |
428 | clear(); | |
429 | } | |
430 | ||
431 | light_function& operator= (BOOST_RV_REF(this_type) that) BOOST_NOEXCEPT | |
432 | { | |
433 | this->swap(that); | |
434 | return *this; | |
435 | } | |
436 | light_function& operator= (BOOST_COPY_ASSIGN_REF(this_type) that) | |
437 | { | |
438 | light_function tmp = static_cast< this_type const& >(that); | |
439 | this->swap(tmp); | |
440 | return *this; | |
441 | } | |
442 | //! Assignment of NULL | |
443 | #if !defined(BOOST_NO_CXX11_NULLPTR) | |
444 | light_function& operator= (std::nullptr_t) | |
445 | #else | |
446 | light_function& operator= (int p) | |
447 | #endif | |
448 | { | |
449 | #if defined(BOOST_NO_CXX11_NULLPTR) | |
450 | BOOST_ASSERT(p == 0); | |
451 | #endif | |
452 | clear(); | |
453 | return *this; | |
454 | } | |
455 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
456 | template< typename FunT > | |
457 | light_function& operator= (FunT&& fun) | |
458 | { | |
459 | light_function tmp(boost::forward< FunT >(fun)); | |
460 | this->swap(tmp); | |
461 | return *this; | |
462 | } | |
463 | #else | |
464 | template< typename FunT > | |
465 | typename boost::disable_if_c< is_rv_or_same< FunT, this_type >::value, this_type& >::type | |
466 | operator= (FunT const& fun) | |
467 | { | |
468 | light_function tmp(fun); | |
469 | this->swap(tmp); | |
470 | return *this; | |
471 | } | |
472 | #endif | |
473 | ||
474 | result_type operator() (ArgsT... args) const | |
475 | { | |
476 | m_pImpl->invoke(m_pImpl, args...); | |
477 | } | |
478 | ||
479 | BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT() | |
480 | bool operator! () const BOOST_NOEXCEPT { return (m_pImpl == NULL); } | |
481 | bool empty() const BOOST_NOEXCEPT { return (m_pImpl == NULL); } | |
482 | void clear() BOOST_NOEXCEPT | |
483 | { | |
484 | if (m_pImpl) | |
485 | { | |
486 | m_pImpl->destroy(m_pImpl); | |
487 | m_pImpl = NULL; | |
488 | } | |
489 | } | |
490 | ||
491 | void swap(this_type& that) BOOST_NOEXCEPT | |
492 | { | |
493 | impl_base* p = m_pImpl; | |
494 | m_pImpl = that.m_pImpl; | |
495 | that.m_pImpl = p; | |
496 | } | |
497 | }; | |
498 | ||
499 | #else // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) | |
500 | ||
501 | #define BOOST_PP_FILENAME_1 <boost/log/detail/light_function_pp.hpp> | |
502 | #define BOOST_PP_ITERATION_LIMITS (0, BOOST_LOG_LIGHT_FUNCTION_LIMIT) | |
503 | #include BOOST_PP_ITERATE() | |
504 | ||
505 | #endif // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) | |
506 | ||
507 | template< typename SignatureT > | |
508 | inline void swap(light_function< SignatureT >& left, light_function< SignatureT >& right) | |
509 | { | |
510 | left.swap(right); | |
511 | } | |
512 | ||
513 | } // namespace aux | |
514 | ||
515 | BOOST_LOG_CLOSE_NAMESPACE // namespace log | |
516 | ||
517 | } // namespace boost | |
518 | ||
519 | #include <boost/log/detail/footer.hpp> | |
520 | ||
521 | #endif // BOOST_LOG_DETAIL_LIGHT_FUNCTION_HPP_INCLUDED_ |