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FG		 1// Boost.Function library
2
3// Copyright Douglas Gregor 2001-2006
4// Copyright Emil Dotchevski 2007
5// Use, modification and distribution is subject to the Boost Software License, Version 1.0.
6// (See accompanying file LICENSE_1_0.txt or copy at
7// http://www.boost.org/LICENSE_1_0.txt)
8
9// For more information, see http://www.boost.org
10
11// Note: this header is a header template and must NOT have multiple-inclusion
12// protection.
13#include <boost/function/detail/prologue.hpp>
14#include <boost/detail/no_exceptions_support.hpp>
15
16#if defined(BOOST_MSVC)
17# pragma warning( push )
18# pragma warning( disable : 4127 ) // "conditional expression is constant"
19#endif
20
21#define BOOST_FUNCTION_TEMPLATE_PARMS BOOST_PP_ENUM_PARAMS(BOOST_FUNCTION_NUM_ARGS, typename T)
22
23#define BOOST_FUNCTION_TEMPLATE_ARGS BOOST_PP_ENUM_PARAMS(BOOST_FUNCTION_NUM_ARGS, T)
24
25#define BOOST_FUNCTION_PARM(J,I,D) BOOST_PP_CAT(T,I) BOOST_PP_CAT(a,I)
26
27#define BOOST_FUNCTION_PARMS BOOST_PP_ENUM(BOOST_FUNCTION_NUM_ARGS,BOOST_FUNCTION_PARM,BOOST_PP_EMPTY)
28
29#ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
30# define BOOST_FUNCTION_ARGS BOOST_PP_ENUM_PARAMS(BOOST_FUNCTION_NUM_ARGS, a)
31#else
32# include <boost/move/utility_core.hpp>
33# define BOOST_FUNCTION_ARG(J,I,D) ::boost::forward< BOOST_PP_CAT(T,I) >(BOOST_PP_CAT(a,I))
34# define BOOST_FUNCTION_ARGS BOOST_PP_ENUM(BOOST_FUNCTION_NUM_ARGS,BOOST_FUNCTION_ARG,BOOST_PP_EMPTY)
35#endif
36
37#define BOOST_FUNCTION_ARG_TYPE(J,I,D) \
38 typedef BOOST_PP_CAT(T,I) BOOST_PP_CAT(BOOST_PP_CAT(arg, BOOST_PP_INC(I)),_type);
39
40#define BOOST_FUNCTION_ARG_TYPES BOOST_PP_REPEAT(BOOST_FUNCTION_NUM_ARGS,BOOST_FUNCTION_ARG_TYPE,BOOST_PP_EMPTY)
41
42// Comma if nonzero number of arguments
43#if BOOST_FUNCTION_NUM_ARGS == 0
44# define BOOST_FUNCTION_COMMA
45#else
46# define BOOST_FUNCTION_COMMA ,
47#endif // BOOST_FUNCTION_NUM_ARGS > 0
48
49// Class names used in this version of the code
50#define BOOST_FUNCTION_FUNCTION BOOST_JOIN(function,BOOST_FUNCTION_NUM_ARGS)
51#define BOOST_FUNCTION_FUNCTION_INVOKER \
52 BOOST_JOIN(function_invoker,BOOST_FUNCTION_NUM_ARGS)
53#define BOOST_FUNCTION_VOID_FUNCTION_INVOKER \
54 BOOST_JOIN(void_function_invoker,BOOST_FUNCTION_NUM_ARGS)
55#define BOOST_FUNCTION_FUNCTION_OBJ_INVOKER \
56 BOOST_JOIN(function_obj_invoker,BOOST_FUNCTION_NUM_ARGS)
57#define BOOST_FUNCTION_VOID_FUNCTION_OBJ_INVOKER \
58 BOOST_JOIN(void_function_obj_invoker,BOOST_FUNCTION_NUM_ARGS)
59#define BOOST_FUNCTION_FUNCTION_REF_INVOKER \
60 BOOST_JOIN(function_ref_invoker,BOOST_FUNCTION_NUM_ARGS)
61#define BOOST_FUNCTION_VOID_FUNCTION_REF_INVOKER \
62 BOOST_JOIN(void_function_ref_invoker,BOOST_FUNCTION_NUM_ARGS)
63#define BOOST_FUNCTION_MEMBER_INVOKER \
64 BOOST_JOIN(function_mem_invoker,BOOST_FUNCTION_NUM_ARGS)
65#define BOOST_FUNCTION_VOID_MEMBER_INVOKER \
66 BOOST_JOIN(function_void_mem_invoker,BOOST_FUNCTION_NUM_ARGS)
67#define BOOST_FUNCTION_GET_FUNCTION_INVOKER \
68 BOOST_JOIN(get_function_invoker,BOOST_FUNCTION_NUM_ARGS)
69#define BOOST_FUNCTION_GET_FUNCTION_OBJ_INVOKER \
70 BOOST_JOIN(get_function_obj_invoker,BOOST_FUNCTION_NUM_ARGS)
71#define BOOST_FUNCTION_GET_FUNCTION_REF_INVOKER \
72 BOOST_JOIN(get_function_ref_invoker,BOOST_FUNCTION_NUM_ARGS)
73#define BOOST_FUNCTION_GET_MEMBER_INVOKER \
74 BOOST_JOIN(get_member_invoker,BOOST_FUNCTION_NUM_ARGS)
75#define BOOST_FUNCTION_GET_INVOKER \
76 BOOST_JOIN(get_invoker,BOOST_FUNCTION_NUM_ARGS)
77#define BOOST_FUNCTION_VTABLE BOOST_JOIN(basic_vtable,BOOST_FUNCTION_NUM_ARGS)
78
79#ifndef BOOST_NO_VOID_RETURNS
80# define BOOST_FUNCTION_VOID_RETURN_TYPE void
81# define BOOST_FUNCTION_RETURN(X) X
82#else
83# define BOOST_FUNCTION_VOID_RETURN_TYPE boost::detail::function::unusable
84# define BOOST_FUNCTION_RETURN(X) X; return BOOST_FUNCTION_VOID_RETURN_TYPE ()
85#endif
86
87namespace boost {
88 namespace detail {
89 namespace function {
90 template<
91 typename FunctionPtr,
92 typename R BOOST_FUNCTION_COMMA
93 BOOST_FUNCTION_TEMPLATE_PARMS
94 >
95 struct BOOST_FUNCTION_FUNCTION_INVOKER
96 {
97 static R invoke(function_buffer& function_ptr BOOST_FUNCTION_COMMA
98 BOOST_FUNCTION_PARMS)
99 {
100 FunctionPtr f = reinterpret_cast<FunctionPtr>(function_ptr.members.func_ptr);
101 return f(BOOST_FUNCTION_ARGS);
102 }
103 };
104
105 template<
106 typename FunctionPtr,
107 typename R BOOST_FUNCTION_COMMA
108 BOOST_FUNCTION_TEMPLATE_PARMS
109 >
110 struct BOOST_FUNCTION_VOID_FUNCTION_INVOKER
111 {
112 static BOOST_FUNCTION_VOID_RETURN_TYPE
113 invoke(function_buffer& function_ptr BOOST_FUNCTION_COMMA
114 BOOST_FUNCTION_PARMS)
115
116 {
117 FunctionPtr f = reinterpret_cast<FunctionPtr>(function_ptr.members.func_ptr);
118 BOOST_FUNCTION_RETURN(f(BOOST_FUNCTION_ARGS));
119 }
120 };
121
122 template<
123 typename FunctionObj,
124 typename R BOOST_FUNCTION_COMMA
125 BOOST_FUNCTION_TEMPLATE_PARMS
126 >
127 struct BOOST_FUNCTION_FUNCTION_OBJ_INVOKER
128 {
129 static R invoke(function_buffer& function_obj_ptr BOOST_FUNCTION_COMMA
130 BOOST_FUNCTION_PARMS)
131
132 {
133 FunctionObj* f;
134 if (function_allows_small_object_optimization<FunctionObj>::value)
135 f = reinterpret_cast<FunctionObj*>(function_obj_ptr.data);
136 else
137 f = reinterpret_cast<FunctionObj*>(function_obj_ptr.members.obj_ptr);
138 return (*f)(BOOST_FUNCTION_ARGS);
139 }
140 };
141
142 template<
143 typename FunctionObj,
144 typename R BOOST_FUNCTION_COMMA
145 BOOST_FUNCTION_TEMPLATE_PARMS
146 >
147 struct BOOST_FUNCTION_VOID_FUNCTION_OBJ_INVOKER
148 {
149 static BOOST_FUNCTION_VOID_RETURN_TYPE
150 invoke(function_buffer& function_obj_ptr BOOST_FUNCTION_COMMA
151 BOOST_FUNCTION_PARMS)
152
153 {
154 FunctionObj* f;
155 if (function_allows_small_object_optimization<FunctionObj>::value)
156 f = reinterpret_cast<FunctionObj*>(function_obj_ptr.data);
157 else
158 f = reinterpret_cast<FunctionObj*>(function_obj_ptr.members.obj_ptr);
159 BOOST_FUNCTION_RETURN((*f)(BOOST_FUNCTION_ARGS));
160 }
161 };
162
163 template<
164 typename FunctionObj,
165 typename R BOOST_FUNCTION_COMMA
166 BOOST_FUNCTION_TEMPLATE_PARMS
167 >
168 struct BOOST_FUNCTION_FUNCTION_REF_INVOKER
169 {
170 static R invoke(function_buffer& function_obj_ptr BOOST_FUNCTION_COMMA
171 BOOST_FUNCTION_PARMS)
172
173 {
174 FunctionObj* f =
175 reinterpret_cast<FunctionObj*>(function_obj_ptr.members.obj_ptr);
176 return (*f)(BOOST_FUNCTION_ARGS);
177 }
178 };
179
180 template<
181 typename FunctionObj,
182 typename R BOOST_FUNCTION_COMMA
183 BOOST_FUNCTION_TEMPLATE_PARMS
184 >
185 struct BOOST_FUNCTION_VOID_FUNCTION_REF_INVOKER
186 {
187 static BOOST_FUNCTION_VOID_RETURN_TYPE
188 invoke(function_buffer& function_obj_ptr BOOST_FUNCTION_COMMA
189 BOOST_FUNCTION_PARMS)
190
191 {
192 FunctionObj* f =
193 reinterpret_cast<FunctionObj*>(function_obj_ptr.members.obj_ptr);
194 BOOST_FUNCTION_RETURN((*f)(BOOST_FUNCTION_ARGS));
195 }
196 };
197
198#if BOOST_FUNCTION_NUM_ARGS > 0
199 /* Handle invocation of member pointers. */
200 template<
201 typename MemberPtr,
202 typename R BOOST_FUNCTION_COMMA
203 BOOST_FUNCTION_TEMPLATE_PARMS
204 >
205 struct BOOST_FUNCTION_MEMBER_INVOKER
206 {
207 static R invoke(function_buffer& function_obj_ptr BOOST_FUNCTION_COMMA
208 BOOST_FUNCTION_PARMS)
209
210 {
211 MemberPtr* f =
212 reinterpret_cast<MemberPtr*>(function_obj_ptr.data);
213 return boost::mem_fn(*f)(BOOST_FUNCTION_ARGS);
214 }
215 };
216
217 template<
218 typename MemberPtr,
219 typename R BOOST_FUNCTION_COMMA
220 BOOST_FUNCTION_TEMPLATE_PARMS
221 >
222 struct BOOST_FUNCTION_VOID_MEMBER_INVOKER
223 {
224 static BOOST_FUNCTION_VOID_RETURN_TYPE
225 invoke(function_buffer& function_obj_ptr BOOST_FUNCTION_COMMA
226 BOOST_FUNCTION_PARMS)
227
228 {
229 MemberPtr* f =
230 reinterpret_cast<MemberPtr*>(function_obj_ptr.data);
231 BOOST_FUNCTION_RETURN(boost::mem_fn(*f)(BOOST_FUNCTION_ARGS));
232 }
233 };
234#endif
235
236 template<
237 typename FunctionPtr,
238 typename R BOOST_FUNCTION_COMMA
239 BOOST_FUNCTION_TEMPLATE_PARMS
240 >
241 struct BOOST_FUNCTION_GET_FUNCTION_INVOKER
242 {
243 typedef typename mpl::if_c<(is_void<R>::value),
244 BOOST_FUNCTION_VOID_FUNCTION_INVOKER<
245 FunctionPtr,
246 R BOOST_FUNCTION_COMMA
247 BOOST_FUNCTION_TEMPLATE_ARGS
248 >,
249 BOOST_FUNCTION_FUNCTION_INVOKER<
250 FunctionPtr,
251 R BOOST_FUNCTION_COMMA
252 BOOST_FUNCTION_TEMPLATE_ARGS
253 >
254 >::type type;
255 };
256
257 template<
258 typename FunctionObj,
259 typename R BOOST_FUNCTION_COMMA
260 BOOST_FUNCTION_TEMPLATE_PARMS
261 >
262 struct BOOST_FUNCTION_GET_FUNCTION_OBJ_INVOKER
263 {
264 typedef typename mpl::if_c<(is_void<R>::value),
265 BOOST_FUNCTION_VOID_FUNCTION_OBJ_INVOKER<
266 FunctionObj,
267 R BOOST_FUNCTION_COMMA
268 BOOST_FUNCTION_TEMPLATE_ARGS
269 >,
270 BOOST_FUNCTION_FUNCTION_OBJ_INVOKER<
271 FunctionObj,
272 R BOOST_FUNCTION_COMMA
273 BOOST_FUNCTION_TEMPLATE_ARGS
274 >
275 >::type type;
276 };
277
278 template<
279 typename FunctionObj,
280 typename R BOOST_FUNCTION_COMMA
281 BOOST_FUNCTION_TEMPLATE_PARMS
282 >
283 struct BOOST_FUNCTION_GET_FUNCTION_REF_INVOKER
284 {
285 typedef typename mpl::if_c<(is_void<R>::value),
286 BOOST_FUNCTION_VOID_FUNCTION_REF_INVOKER<
287 FunctionObj,
288 R BOOST_FUNCTION_COMMA
289 BOOST_FUNCTION_TEMPLATE_ARGS
290 >,
291 BOOST_FUNCTION_FUNCTION_REF_INVOKER<
292 FunctionObj,
293 R BOOST_FUNCTION_COMMA
294 BOOST_FUNCTION_TEMPLATE_ARGS
295 >
296 >::type type;
297 };
298
299#if BOOST_FUNCTION_NUM_ARGS > 0
300 /* Retrieve the appropriate invoker for a member pointer. */
301 template<
302 typename MemberPtr,
303 typename R BOOST_FUNCTION_COMMA
304 BOOST_FUNCTION_TEMPLATE_PARMS
305 >
306 struct BOOST_FUNCTION_GET_MEMBER_INVOKER
307 {
308 typedef typename mpl::if_c<(is_void<R>::value),
309 BOOST_FUNCTION_VOID_MEMBER_INVOKER<
310 MemberPtr,
311 R BOOST_FUNCTION_COMMA
312 BOOST_FUNCTION_TEMPLATE_ARGS
313 >,
314 BOOST_FUNCTION_MEMBER_INVOKER<
315 MemberPtr,
316 R BOOST_FUNCTION_COMMA
317 BOOST_FUNCTION_TEMPLATE_ARGS
318 >
319 >::type type;
320 };
321#endif
322
323 /* Given the tag returned by get_function_tag, retrieve the
324 actual invoker that will be used for the given function
325 object.
326
327 Each specialization contains an "apply" nested class template
328 that accepts the function object, return type, function
329 argument types, and allocator. The resulting "apply" class
330 contains two typedefs, "invoker_type" and "manager_type",
331 which correspond to the invoker and manager types. */
332 template<typename Tag>
333 struct BOOST_FUNCTION_GET_INVOKER { };
334
335 /* Retrieve the invoker for a function pointer. */
336 template<>
337 struct BOOST_FUNCTION_GET_INVOKER<function_ptr_tag>
338 {
339 template<typename FunctionPtr,
340 typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS>
341 struct apply
342 {
343 typedef typename BOOST_FUNCTION_GET_FUNCTION_INVOKER<
344 FunctionPtr,
345 R BOOST_FUNCTION_COMMA
346 BOOST_FUNCTION_TEMPLATE_ARGS
347 >::type
348 invoker_type;
349
350 typedef functor_manager<FunctionPtr> manager_type;
351 };
352
353 template<typename FunctionPtr,
354 typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS,
355 typename Allocator>
356 struct apply_a
357 {
358 typedef typename BOOST_FUNCTION_GET_FUNCTION_INVOKER<
359 FunctionPtr,
360 R BOOST_FUNCTION_COMMA
361 BOOST_FUNCTION_TEMPLATE_ARGS
362 >::type
363 invoker_type;
364
365 typedef functor_manager<FunctionPtr> manager_type;
366 };
367 };
368
369#if BOOST_FUNCTION_NUM_ARGS > 0
370 /* Retrieve the invoker for a member pointer. */
371 template<>
372 struct BOOST_FUNCTION_GET_INVOKER<member_ptr_tag>
373 {
374 template<typename MemberPtr,
375 typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS>
376 struct apply
377 {
378 typedef typename BOOST_FUNCTION_GET_MEMBER_INVOKER<
379 MemberPtr,
380 R BOOST_FUNCTION_COMMA
381 BOOST_FUNCTION_TEMPLATE_ARGS
382 >::type
383 invoker_type;
384
385 typedef functor_manager<MemberPtr> manager_type;
386 };
387
388 template<typename MemberPtr,
389 typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS,
390 typename Allocator>
391 struct apply_a
392 {
393 typedef typename BOOST_FUNCTION_GET_MEMBER_INVOKER<
394 MemberPtr,
395 R BOOST_FUNCTION_COMMA
396 BOOST_FUNCTION_TEMPLATE_ARGS
397 >::type
398 invoker_type;
399
400 typedef functor_manager<MemberPtr> manager_type;
401 };
402 };
403#endif
404
405 /* Retrieve the invoker for a function object. */
406 template<>
407 struct BOOST_FUNCTION_GET_INVOKER<function_obj_tag>
408 {
409 template<typename FunctionObj,
410 typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS>
411 struct apply
412 {
413 typedef typename BOOST_FUNCTION_GET_FUNCTION_OBJ_INVOKER<
414 FunctionObj,
415 R BOOST_FUNCTION_COMMA
416 BOOST_FUNCTION_TEMPLATE_ARGS
417 >::type
418 invoker_type;
419
420 typedef functor_manager<FunctionObj> manager_type;
421 };
422
423 template<typename FunctionObj,
424 typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS,
425 typename Allocator>
426 struct apply_a
427 {
428 typedef typename BOOST_FUNCTION_GET_FUNCTION_OBJ_INVOKER<
429 FunctionObj,
430 R BOOST_FUNCTION_COMMA
431 BOOST_FUNCTION_TEMPLATE_ARGS
432 >::type
433 invoker_type;
434
435 typedef functor_manager_a<FunctionObj, Allocator> manager_type;
436 };
437 };
438
439 /* Retrieve the invoker for a reference to a function object. */
440 template<>
441 struct BOOST_FUNCTION_GET_INVOKER<function_obj_ref_tag>
442 {
443 template<typename RefWrapper,
444 typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS>
445 struct apply
446 {
447 typedef typename BOOST_FUNCTION_GET_FUNCTION_REF_INVOKER<
448 typename RefWrapper::type,
449 R BOOST_FUNCTION_COMMA
450 BOOST_FUNCTION_TEMPLATE_ARGS
451 >::type
452 invoker_type;
453
454 typedef reference_manager<typename RefWrapper::type> manager_type;
455 };
456
457 template<typename RefWrapper,
458 typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS,
459 typename Allocator>
460 struct apply_a
461 {
462 typedef typename BOOST_FUNCTION_GET_FUNCTION_REF_INVOKER<
463 typename RefWrapper::type,
464 R BOOST_FUNCTION_COMMA
465 BOOST_FUNCTION_TEMPLATE_ARGS
466 >::type
467 invoker_type;
468
469 typedef reference_manager<typename RefWrapper::type> manager_type;
470 };
471 };
472
473
474 /**
475 * vtable for a specific boost::function instance. This
476 * structure must be an aggregate so that we can use static
477 * initialization in boost::function's assign_to and assign_to_a
478 * members. It therefore cannot have any constructors,
479 * destructors, base classes, etc.
480 */
481 template<typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS>
482 struct BOOST_FUNCTION_VTABLE
483 {
484#ifndef BOOST_NO_VOID_RETURNS
485 typedef R result_type;
486#else
487 typedef typename function_return_type<R>::type result_type;
488#endif // BOOST_NO_VOID_RETURNS
489
490 typedef result_type (*invoker_type)(function_buffer&
491 BOOST_FUNCTION_COMMA
492 BOOST_FUNCTION_TEMPLATE_ARGS);
493
494 template<typename F>
495 bool assign_to(F f, function_buffer& functor) const
496 {
497 typedef typename get_function_tag<F>::type tag;
498 return assign_to(f, functor, tag());
499 }
500 template<typename F,typename Allocator>
501 bool assign_to_a(F f, function_buffer& functor, Allocator a) const
502 {
503 typedef typename get_function_tag<F>::type tag;
504 return assign_to_a(f, functor, a, tag());
505 }
506
507 void clear(function_buffer& functor) const
508 {
509 if (base.manager)
510 base.manager(functor, functor, destroy_functor_tag);
511 }
512
513 private:
514 // Function pointers
515 template<typename FunctionPtr>
516 bool
517 assign_to(FunctionPtr f, function_buffer& functor, function_ptr_tag) const
518 {
519 this->clear(functor);
520 if (f) {
521 // should be a reinterpret cast, but some compilers insist
522 // on giving cv-qualifiers to free functions
523 functor.members.func_ptr = reinterpret_cast<void (*)()>(f);
524 return true;
525 } else {
526 return false;
527 }
528 }
529 template<typename FunctionPtr,typename Allocator>
530 bool
531 assign_to_a(FunctionPtr f, function_buffer& functor, Allocator, function_ptr_tag) const
532 {
533 return assign_to(f,functor,function_ptr_tag());
534 }
535
536 // Member pointers
537#if BOOST_FUNCTION_NUM_ARGS > 0
538 template<typename MemberPtr>
539 bool assign_to(MemberPtr f, function_buffer& functor, member_ptr_tag) const
540 {
541 // DPG TBD: Add explicit support for member function
542 // objects, so we invoke through mem_fn() but we retain the
543 // right target_type() values.
544 if (f) {
545 this->assign_to(boost::mem_fn(f), functor);
546 return true;
547 } else {
548 return false;
549 }
550 }
551 template<typename MemberPtr,typename Allocator>
552 bool assign_to_a(MemberPtr f, function_buffer& functor, Allocator a, member_ptr_tag) const
553 {
554 // DPG TBD: Add explicit support for member function
555 // objects, so we invoke through mem_fn() but we retain the
556 // right target_type() values.
557 if (f) {
558 this->assign_to_a(boost::mem_fn(f), functor, a);
559 return true;
560 } else {
561 return false;
562 }
563 }
564#endif // BOOST_FUNCTION_NUM_ARGS > 0
565
566 // Function objects
567 // Assign to a function object using the small object optimization
568 template<typename FunctionObj>
569 void
570 assign_functor(FunctionObj f, function_buffer& functor, mpl::true_) const
571 {
572 new (reinterpret_cast<void*>(functor.data)) FunctionObj(f);
573 }
574 template<typename FunctionObj,typename Allocator>
575 void
576 assign_functor_a(FunctionObj f, function_buffer& functor, Allocator, mpl::true_) const
577 {
578 assign_functor(f,functor,mpl::true_());
579 }
580
581 // Assign to a function object allocated on the heap.
582 template<typename FunctionObj>
583 void
584 assign_functor(FunctionObj f, function_buffer& functor, mpl::false_) const
585 {
586 functor.members.obj_ptr = new FunctionObj(f);
587 }
588 template<typename FunctionObj,typename Allocator>
589 void
590 assign_functor_a(FunctionObj f, function_buffer& functor, Allocator a, mpl::false_) const
591 {
592 typedef functor_wrapper<FunctionObj,Allocator> functor_wrapper_type;
593 typedef typename Allocator::template rebind<functor_wrapper_type>::other
594 wrapper_allocator_type;
595 typedef typename wrapper_allocator_type::pointer wrapper_allocator_pointer_type;
596 wrapper_allocator_type wrapper_allocator(a);
597 wrapper_allocator_pointer_type copy = wrapper_allocator.allocate(1);
598 wrapper_allocator.construct(copy, functor_wrapper_type(f,a));
599 functor_wrapper_type* new_f = static_cast<functor_wrapper_type*>(copy);
600 functor.members.obj_ptr = new_f;
601 }
602
603 template<typename FunctionObj>
604 bool
605 assign_to(FunctionObj f, function_buffer& functor, function_obj_tag) const
606 {
607 if (!boost::detail::function::has_empty_target(boost::addressof(f))) {
608 assign_functor(f, functor,
609 mpl::bool_<(function_allows_small_object_optimization<FunctionObj>::value)>());
610 return true;
611 } else {
612 return false;
613 }
614 }
615 template<typename FunctionObj,typename Allocator>
616 bool
617 assign_to_a(FunctionObj f, function_buffer& functor, Allocator a, function_obj_tag) const
618 {
619 if (!boost::detail::function::has_empty_target(boost::addressof(f))) {
620 assign_functor_a(f, functor, a,
621 mpl::bool_<(function_allows_small_object_optimization<FunctionObj>::value)>());
622 return true;
623 } else {
624 return false;
625 }
626 }
627
628 // Reference to a function object
629 template<typename FunctionObj>
630 bool
631 assign_to(const reference_wrapper<FunctionObj>& f,
632 function_buffer& functor, function_obj_ref_tag) const
633 {
634 functor.members.obj_ref.obj_ptr = (void *)(f.get_pointer());
635 functor.members.obj_ref.is_const_qualified = is_const<FunctionObj>::value;
636 functor.members.obj_ref.is_volatile_qualified = is_volatile<FunctionObj>::value;
637 return true;
638 }
639 template<typename FunctionObj,typename Allocator>
640 bool
641 assign_to_a(const reference_wrapper<FunctionObj>& f,
642 function_buffer& functor, Allocator, function_obj_ref_tag) const
643 {
644 return assign_to(f,functor,function_obj_ref_tag());
645 }
646
647 public:
648 vtable_base base;
649 invoker_type invoker;
650 };
651 } // end namespace function
652 } // end namespace detail
653
654 template<
655 typename R BOOST_FUNCTION_COMMA
656 BOOST_FUNCTION_TEMPLATE_PARMS
657 >
658 class BOOST_FUNCTION_FUNCTION : public function_base
659
660#if BOOST_FUNCTION_NUM_ARGS == 1
661
662 , public std::unary_function<T0,R>
663
664#elif BOOST_FUNCTION_NUM_ARGS == 2
665
666 , public std::binary_function<T0,T1,R>
667
668#endif
669
670 {
671 public:
672#ifndef BOOST_NO_VOID_RETURNS
673 typedef R result_type;
674#else
675 typedef typename boost::detail::function::function_return_type<R>::type
676 result_type;
677#endif // BOOST_NO_VOID_RETURNS
678
679 private:
680 typedef boost::detail::function::BOOST_FUNCTION_VTABLE<
681 R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_ARGS>
682 vtable_type;
683
684 vtable_type* get_vtable() const {
685 return reinterpret_cast<vtable_type*>(
686 reinterpret_cast<std::size_t>(vtable) & ~static_cast<std::size_t>(0x01));
687 }
688
689 struct clear_type {};
690
691 public:
692 BOOST_STATIC_CONSTANT(int, args = BOOST_FUNCTION_NUM_ARGS);
693
694 // add signature for boost::lambda
695 template<typename Args>
696 struct sig
697 {
698 typedef result_type type;
699 };
700
701#if BOOST_FUNCTION_NUM_ARGS == 1
702 typedef T0 argument_type;
703#elif BOOST_FUNCTION_NUM_ARGS == 2
704 typedef T0 first_argument_type;
705 typedef T1 second_argument_type;
706#endif
707
708 BOOST_STATIC_CONSTANT(int, arity = BOOST_FUNCTION_NUM_ARGS);
709 BOOST_FUNCTION_ARG_TYPES
710
711 typedef BOOST_FUNCTION_FUNCTION self_type;
712
713 BOOST_FUNCTION_FUNCTION() : function_base() { }
714
715 // MSVC chokes if the following two constructors are collapsed into
716 // one with a default parameter.
717 template<typename Functor>
718 BOOST_FUNCTION_FUNCTION(Functor BOOST_FUNCTION_TARGET_FIX(const &) f
719#ifndef BOOST_NO_SFINAE
720 ,typename boost::enable_if_c<
721 !(is_integral<Functor>::value),
722 int>::type = 0
723#endif // BOOST_NO_SFINAE
724 ) :
725 function_base()
726 {
727 this->assign_to(f);
728 }
729 template<typename Functor,typename Allocator>
730 BOOST_FUNCTION_FUNCTION(Functor BOOST_FUNCTION_TARGET_FIX(const &) f, Allocator a
731#ifndef BOOST_NO_SFINAE
732 ,typename boost::enable_if_c<
733 !(is_integral<Functor>::value),
734 int>::type = 0
735#endif // BOOST_NO_SFINAE
736 ) :
737 function_base()
738 {
739 this->assign_to_a(f,a);
740 }
741
742#ifndef BOOST_NO_SFINAE
743 BOOST_FUNCTION_FUNCTION(clear_type*) : function_base() { }
744#else
745 BOOST_FUNCTION_FUNCTION(int zero) : function_base()
746 {
747 BOOST_ASSERT(zero == 0);
748 }
749#endif
750
751 BOOST_FUNCTION_FUNCTION(const BOOST_FUNCTION_FUNCTION& f) : function_base()
752 {
753 this->assign_to_own(f);
754 }
755
756#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
757 BOOST_FUNCTION_FUNCTION(BOOST_FUNCTION_FUNCTION&& f) : function_base()
758 {
759 this->move_assign(f);
760 }
761#endif
762
763 ~BOOST_FUNCTION_FUNCTION() { clear(); }
764
765 result_type operator()(BOOST_FUNCTION_PARMS) const
766 {
767 if (this->empty())
768 boost::throw_exception(bad_function_call());
769
770 return get_vtable()->invoker
771 (this->functor BOOST_FUNCTION_COMMA BOOST_FUNCTION_ARGS);
772 }
773
774 // The distinction between when to use BOOST_FUNCTION_FUNCTION and
775 // when to use self_type is obnoxious. MSVC cannot handle self_type as
776 // the return type of these assignment operators, but Borland C++ cannot
777 // handle BOOST_FUNCTION_FUNCTION as the type of the temporary to
778 // construct.
779 template<typename Functor>
780#ifndef BOOST_NO_SFINAE
781 typename boost::enable_if_c<
782 !(is_integral<Functor>::value),
783 BOOST_FUNCTION_FUNCTION&>::type
784#else
785 BOOST_FUNCTION_FUNCTION&
786#endif
787 operator=(Functor BOOST_FUNCTION_TARGET_FIX(const &) f)
788 {
789 this->clear();
790 BOOST_TRY {
791 this->assign_to(f);
792 } BOOST_CATCH (...) {
793 vtable = 0;
794 BOOST_RETHROW;
795 }
796 BOOST_CATCH_END
797 return *this;
798 }
799 template<typename Functor,typename Allocator>
800 void assign(Functor BOOST_FUNCTION_TARGET_FIX(const &) f, Allocator a)
801 {
802 this->clear();
803 BOOST_TRY{
804 this->assign_to_a(f,a);
805 } BOOST_CATCH (...) {
806 vtable = 0;
807 BOOST_RETHROW;
808 }
809 BOOST_CATCH_END
810 }
811
812#ifndef BOOST_NO_SFINAE
813 BOOST_FUNCTION_FUNCTION& operator=(clear_type*)
814 {
815 this->clear();
816 return *this;
817 }
818#else
819 BOOST_FUNCTION_FUNCTION& operator=(int zero)
820 {
821 BOOST_ASSERT(zero == 0);
822 this->clear();
823 return *this;
824 }
825#endif
826
827 // Assignment from another BOOST_FUNCTION_FUNCTION
828 BOOST_FUNCTION_FUNCTION& operator=(const BOOST_FUNCTION_FUNCTION& f)
829 {
830 if (&f == this)
831 return *this;
832
833 this->clear();
834 BOOST_TRY {
835 this->assign_to_own(f);
836 } BOOST_CATCH (...) {
837 vtable = 0;
838 BOOST_RETHROW;
839 }
840 BOOST_CATCH_END
841 return *this;
842 }
843
844#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
845 // Move assignment from another BOOST_FUNCTION_FUNCTION
846 BOOST_FUNCTION_FUNCTION& operator=(BOOST_FUNCTION_FUNCTION&& f)
847 {
848 if (&f == this)
849 return *this;
850
851 this->clear();
852 BOOST_TRY {
853 this->move_assign(f);
854 } BOOST_CATCH (...) {
855 vtable = 0;
856 BOOST_RETHROW;
857 }
858 BOOST_CATCH_END
859 return *this;
860 }
861#endif
862
863 void swap(BOOST_FUNCTION_FUNCTION& other)
864 {
865 if (&other == this)
866 return;
867
868 BOOST_FUNCTION_FUNCTION tmp;
869 tmp.move_assign(*this);
870 this->move_assign(other);
871 other.move_assign(tmp);
872 }
873
874 // Clear out a target, if there is one
875 void clear()
876 {
877 if (vtable) {
878 if (!this->has_trivial_copy_and_destroy())
879 get_vtable()->clear(this->functor);
880 vtable = 0;
881 }
882 }
883
884#if (defined __SUNPRO_CC) && (__SUNPRO_CC <= 0x530) && !(defined BOOST_NO_COMPILER_CONFIG)
885 // Sun C++ 5.3 can't handle the safe_bool idiom, so don't use it
886 operator bool () const { return !this->empty(); }
887#else
888 private:
889 struct dummy {
890 void nonnull() {}
891 };
892
893 typedef void (dummy::*safe_bool)();
894
895 public:
896 operator safe_bool () const
897 { return (this->empty())? 0 : &dummy::nonnull; }
898
899 bool operator!() const
900 { return this->empty(); }
901#endif
902
903 private:
904 void assign_to_own(const BOOST_FUNCTION_FUNCTION& f)
905 {
906 if (!f.empty()) {
907 this->vtable = f.vtable;
908 if (this->has_trivial_copy_and_destroy())
909 this->functor = f.functor;
910 else
911 get_vtable()->base.manager(f.functor, this->functor,
912 boost::detail::function::clone_functor_tag);
913 }
914 }
915
916 template<typename Functor>
917 void assign_to(Functor f)
918 {
919 using boost::detail::function::vtable_base;
920
921 typedef typename boost::detail::function::get_function_tag<Functor>::type tag;
922 typedef boost::detail::function::BOOST_FUNCTION_GET_INVOKER<tag> get_invoker;
923 typedef typename get_invoker::
924 template apply<Functor, R BOOST_FUNCTION_COMMA
925 BOOST_FUNCTION_TEMPLATE_ARGS>
926 handler_type;
927
928 typedef typename handler_type::invoker_type invoker_type;
929 typedef typename handler_type::manager_type manager_type;
930
931 // Note: it is extremely important that this initialization use
932 // static initialization. Otherwise, we will have a race
933 // condition here in multi-threaded code. See
934 // http://thread.gmane.org/gmane.comp.lib.boost.devel/164902/.
935 static const vtable_type stored_vtable =
936 { { &manager_type::manage }, &invoker_type::invoke };
937
938 if (stored_vtable.assign_to(f, functor)) {
939 std::size_t value = reinterpret_cast<std::size_t>(&stored_vtable.base);
940 // coverity[pointless_expression]: suppress coverity warnings on apparant if(const).
941 if (boost::has_trivial_copy_constructor<Functor>::value &&
942 boost::has_trivial_destructor<Functor>::value &&
943 boost::detail::function::function_allows_small_object_optimization<Functor>::value)
944 value |= static_cast<std::size_t>(0x01);
945 vtable = reinterpret_cast<boost::detail::function::vtable_base *>(value);
946 } else
947 vtable = 0;
948 }
949
950 template<typename Functor,typename Allocator>
951 void assign_to_a(Functor f,Allocator a)
952 {
953 using boost::detail::function::vtable_base;
954
955 typedef typename boost::detail::function::get_function_tag<Functor>::type tag;
956 typedef boost::detail::function::BOOST_FUNCTION_GET_INVOKER<tag> get_invoker;
957 typedef typename get_invoker::
958 template apply_a<Functor, R BOOST_FUNCTION_COMMA
959 BOOST_FUNCTION_TEMPLATE_ARGS,
960 Allocator>
961 handler_type;
962
963 typedef typename handler_type::invoker_type invoker_type;
964 typedef typename handler_type::manager_type manager_type;
965
966 // Note: it is extremely important that this initialization use
967 // static initialization. Otherwise, we will have a race
968 // condition here in multi-threaded code. See
969 // http://thread.gmane.org/gmane.comp.lib.boost.devel/164902/.
970 static const vtable_type stored_vtable =
971 { { &manager_type::manage }, &invoker_type::invoke };
972
973 if (stored_vtable.assign_to_a(f, functor, a)) {
974 std::size_t value = reinterpret_cast<std::size_t>(&stored_vtable.base);
975 // coverity[pointless_expression]: suppress coverity warnings on apparant if(const).
976 if (boost::has_trivial_copy_constructor<Functor>::value &&
977 boost::has_trivial_destructor<Functor>::value &&
978 boost::detail::function::function_allows_small_object_optimization<Functor>::value)
979 value |= static_cast<std::size_t>(0x01);
980 vtable = reinterpret_cast<boost::detail::function::vtable_base *>(value);
981 } else
982 vtable = 0;
983 }
984
985 // Moves the value from the specified argument to *this. If the argument
986 // has its function object allocated on the heap, move_assign will pass
987 // its buffer to *this, and set the argument's buffer pointer to NULL.
988 void move_assign(BOOST_FUNCTION_FUNCTION& f)
989 {
990 if (&f == this)
991 return;
992
993 BOOST_TRY {
994 if (!f.empty()) {
995 this->vtable = f.vtable;
996 if (this->has_trivial_copy_and_destroy())
997 this->functor = f.functor;
998 else
999 get_vtable()->base.manager(f.functor, this->functor,
1000 boost::detail::function::move_functor_tag);
1001 f.vtable = 0;
1002 } else {
1003 clear();
1004 }
1005 } BOOST_CATCH (...) {
1006 vtable = 0;
1007 BOOST_RETHROW;
1008 }
1009 BOOST_CATCH_END
1010 }
1011 };
1012
1013 template<typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS>
1014 inline void swap(BOOST_FUNCTION_FUNCTION<
1015 R BOOST_FUNCTION_COMMA
1016 BOOST_FUNCTION_TEMPLATE_ARGS
1017 >& f1,
1018 BOOST_FUNCTION_FUNCTION<
1019 R BOOST_FUNCTION_COMMA
1020 BOOST_FUNCTION_TEMPLATE_ARGS
1021 >& f2)
1022 {
1023 f1.swap(f2);
1024 }
1025
1026// Poison comparisons between boost::function objects of the same type.
1027template<typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS>
1028 void operator==(const BOOST_FUNCTION_FUNCTION<
1029 R BOOST_FUNCTION_COMMA
1030 BOOST_FUNCTION_TEMPLATE_ARGS>&,
1031 const BOOST_FUNCTION_FUNCTION<
1032 R BOOST_FUNCTION_COMMA
1033 BOOST_FUNCTION_TEMPLATE_ARGS>&);
1034template<typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS>
1035 void operator!=(const BOOST_FUNCTION_FUNCTION<
1036 R BOOST_FUNCTION_COMMA
1037 BOOST_FUNCTION_TEMPLATE_ARGS>&,
1038 const BOOST_FUNCTION_FUNCTION<
1039 R BOOST_FUNCTION_COMMA
1040 BOOST_FUNCTION_TEMPLATE_ARGS>& );
1041
1042#if !defined(BOOST_FUNCTION_NO_FUNCTION_TYPE_SYNTAX)
1043
1044#if BOOST_FUNCTION_NUM_ARGS == 0
1045#define BOOST_FUNCTION_PARTIAL_SPEC R (void)
1046#else
1047#define BOOST_FUNCTION_PARTIAL_SPEC R (BOOST_PP_ENUM_PARAMS(BOOST_FUNCTION_NUM_ARGS,T))
1048#endif
1049
1050template<typename R BOOST_FUNCTION_COMMA
1051 BOOST_FUNCTION_TEMPLATE_PARMS>
1052class function<BOOST_FUNCTION_PARTIAL_SPEC>
1053 : public BOOST_FUNCTION_FUNCTION<R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_ARGS>
1054{
1055 typedef BOOST_FUNCTION_FUNCTION<R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_ARGS> base_type;
1056 typedef function self_type;
1057
1058 struct clear_type {};
1059
1060public:
1061
1062 function() : base_type() {}
1063
1064 template<typename Functor>
1065 function(Functor f
1066#ifndef BOOST_NO_SFINAE
1067 ,typename boost::enable_if_c<
1068 !(is_integral<Functor>::value),
1069 int>::type = 0
1070#endif
1071 ) :
1072 base_type(f)
1073 {
1074 }
1075 template<typename Functor,typename Allocator>
1076 function(Functor f, Allocator a
1077#ifndef BOOST_NO_SFINAE
1078 ,typename boost::enable_if_c<
1079 !(is_integral<Functor>::value),
1080 int>::type = 0
1081#endif
1082 ) :
1083 base_type(f,a)
1084 {
1085 }
1086
1087#ifndef BOOST_NO_SFINAE
1088 function(clear_type*) : base_type() {}
1089#endif
1090
1091 function(const self_type& f) : base_type(static_cast<const base_type&>(f)){}
1092
1093 function(const base_type& f) : base_type(static_cast<const base_type&>(f)){}
1094
1095#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
1096 // Move constructors
1097 function(self_type&& f): base_type(static_cast<base_type&&>(f)){}
1098 function(base_type&& f): base_type(static_cast<base_type&&>(f)){}
1099#endif
1100
1101 self_type& operator=(const self_type& f)
1102 {
1103 self_type(f).swap(*this);
1104 return *this;
1105 }
1106
1107#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
1108 self_type& operator=(self_type&& f)
1109 {
1110 self_type(static_cast<self_type&&>(f)).swap(*this);
1111 return *this;
1112 }
1113#endif
1114
1115 template<typename Functor>
1116#ifndef BOOST_NO_SFINAE
1117 typename boost::enable_if_c<
1118 !(is_integral<Functor>::value),
1119 self_type&>::type
1120#else
1121 self_type&
1122#endif
1123 operator=(Functor f)
1124 {
1125 self_type(f).swap(*this);
1126 return *this;
1127 }
1128
1129#ifndef BOOST_NO_SFINAE
1130 self_type& operator=(clear_type*)
1131 {
1132 this->clear();
1133 return *this;
1134 }
1135#endif
1136
1137 self_type& operator=(const base_type& f)
1138 {
1139 self_type(f).swap(*this);
1140 return *this;
1141 }
1142
1143#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
1144 self_type& operator=(base_type&& f)
1145 {
1146 self_type(static_cast<base_type&&>(f)).swap(*this);
1147 return *this;
1148 }
1149#endif
1150};
1151
1152#undef BOOST_FUNCTION_PARTIAL_SPEC
1153#endif // have partial specialization
1154
1155} // end namespace boost
1156
1157// Cleanup after ourselves...
1158#undef BOOST_FUNCTION_VTABLE
1159#undef BOOST_FUNCTION_COMMA
1160#undef BOOST_FUNCTION_FUNCTION
1161#undef BOOST_FUNCTION_FUNCTION_INVOKER
1162#undef BOOST_FUNCTION_VOID_FUNCTION_INVOKER
1163#undef BOOST_FUNCTION_FUNCTION_OBJ_INVOKER
1164#undef BOOST_FUNCTION_VOID_FUNCTION_OBJ_INVOKER
1165#undef BOOST_FUNCTION_FUNCTION_REF_INVOKER
1166#undef BOOST_FUNCTION_VOID_FUNCTION_REF_INVOKER
1167#undef BOOST_FUNCTION_MEMBER_INVOKER
1168#undef BOOST_FUNCTION_VOID_MEMBER_INVOKER
1169#undef BOOST_FUNCTION_GET_FUNCTION_INVOKER
1170#undef BOOST_FUNCTION_GET_FUNCTION_OBJ_INVOKER
1171#undef BOOST_FUNCTION_GET_FUNCTION_REF_INVOKER
1172#undef BOOST_FUNCTION_GET_MEM_FUNCTION_INVOKER
1173#undef BOOST_FUNCTION_GET_INVOKER
1174#undef BOOST_FUNCTION_TEMPLATE_PARMS
1175#undef BOOST_FUNCTION_TEMPLATE_ARGS
1176#undef BOOST_FUNCTION_PARMS
1177#undef BOOST_FUNCTION_PARM
1178#ifdef BOOST_FUNCTION_ARG
1179# undef BOOST_FUNCTION_ARG
1180#endif
1181#undef BOOST_FUNCTION_ARGS
1182#undef BOOST_FUNCTION_ARG_TYPE
1183#undef BOOST_FUNCTION_ARG_TYPES
1184#undef BOOST_FUNCTION_VOID_RETURN_TYPE
1185#undef BOOST_FUNCTION_RETURN
1186
1187#if defined(BOOST_MSVC)
1188# pragma warning( pop )
1189#endif
Ceph