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/core/explicit_operator_bool.hpp> |
26 | #include <boost/log/detail/config.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_ |
522 | |