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 public:
661#ifndef BOOST_NO_VOID_RETURNS
662 typedef R result_type;
663#else
664 typedef typename boost::detail::function::function_return_type<R>::type
665 result_type;
666#endif // BOOST_NO_VOID_RETURNS
667
668 private:
669 typedef boost::detail::function::BOOST_FUNCTION_VTABLE<
670 R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_ARGS>
671 vtable_type;
672
673 vtable_type* get_vtable() const {
674 return reinterpret_cast<vtable_type*>(
675 reinterpret_cast<std::size_t>(vtable) & ~static_cast<std::size_t>(0x01));
676 }
677
678 struct clear_type {};
679
680 public:
681 BOOST_STATIC_CONSTANT(int, args = BOOST_FUNCTION_NUM_ARGS);
682
683 // add signature for boost::lambda
684 template<typename Args>
685 struct sig
686 {
687 typedef result_type type;
688 };
689
690#if BOOST_FUNCTION_NUM_ARGS == 1
691 typedef T0 argument_type;
692#elif BOOST_FUNCTION_NUM_ARGS == 2
693 typedef T0 first_argument_type;
694 typedef T1 second_argument_type;
695#endif
696
697 BOOST_STATIC_CONSTANT(int, arity = BOOST_FUNCTION_NUM_ARGS);
698 BOOST_FUNCTION_ARG_TYPES
699
700 typedef BOOST_FUNCTION_FUNCTION self_type;
701
702 BOOST_FUNCTION_FUNCTION() : function_base() { }
703
704 // MSVC chokes if the following two constructors are collapsed into
705 // one with a default parameter.
706 template<typename Functor>
707 BOOST_FUNCTION_FUNCTION(Functor BOOST_FUNCTION_TARGET_FIX(const &) f
708#ifndef BOOST_NO_SFINAE
709 ,typename boost::enable_if_c<
710 !(is_integral<Functor>::value),
711 int>::type = 0
712#endif // BOOST_NO_SFINAE
713 ) :
714 function_base()
715 {
716 this->assign_to(f);
717 }
718 template<typename Functor,typename Allocator>
719 BOOST_FUNCTION_FUNCTION(Functor BOOST_FUNCTION_TARGET_FIX(const &) f, Allocator a
720#ifndef BOOST_NO_SFINAE
721 ,typename boost::enable_if_c<
722 !(is_integral<Functor>::value),
723 int>::type = 0
724#endif // BOOST_NO_SFINAE
725 ) :
726 function_base()
727 {
728 this->assign_to_a(f,a);
729 }
730
731#ifndef BOOST_NO_SFINAE
732 BOOST_FUNCTION_FUNCTION(clear_type*) : function_base() { }
733#else
734 BOOST_FUNCTION_FUNCTION(int zero) : function_base()
735 {
736 BOOST_ASSERT(zero == 0);
737 }
738#endif
739
740 BOOST_FUNCTION_FUNCTION(const BOOST_FUNCTION_FUNCTION& f) : function_base()
741 {
742 this->assign_to_own(f);
743 }
744
745#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
746 BOOST_FUNCTION_FUNCTION(BOOST_FUNCTION_FUNCTION&& f) : function_base()
747 {
748 this->move_assign(f);
749 }
750#endif
751
752 ~BOOST_FUNCTION_FUNCTION() { clear(); }
753
754 result_type operator()(BOOST_FUNCTION_PARMS) const
755 {
756 if (this->empty())
757 boost::throw_exception(bad_function_call());
758
759 return get_vtable()->invoker
760 (this->functor BOOST_FUNCTION_COMMA BOOST_FUNCTION_ARGS);
761 }
762
763 // The distinction between when to use BOOST_FUNCTION_FUNCTION and
764 // when to use self_type is obnoxious. MSVC cannot handle self_type as
765 // the return type of these assignment operators, but Borland C++ cannot
766 // handle BOOST_FUNCTION_FUNCTION as the type of the temporary to
767 // construct.
768 template<typename Functor>
769#ifndef BOOST_NO_SFINAE
770 typename boost::enable_if_c<
771 !(is_integral<Functor>::value),
772 BOOST_FUNCTION_FUNCTION&>::type
773#else
774 BOOST_FUNCTION_FUNCTION&
775#endif
776 operator=(Functor BOOST_FUNCTION_TARGET_FIX(const &) f)
777 {
778 this->clear();
779 BOOST_TRY {
780 this->assign_to(f);
781 } BOOST_CATCH (...) {
782 vtable = 0;
783 BOOST_RETHROW;
784 }
785 BOOST_CATCH_END
786 return *this;
787 }
788 template<typename Functor,typename Allocator>
789 void assign(Functor BOOST_FUNCTION_TARGET_FIX(const &) f, Allocator a)
790 {
791 this->clear();
792 BOOST_TRY{
793 this->assign_to_a(f,a);
794 } BOOST_CATCH (...) {
795 vtable = 0;
796 BOOST_RETHROW;
797 }
798 BOOST_CATCH_END
799 }
800
801#ifndef BOOST_NO_SFINAE
802 BOOST_FUNCTION_FUNCTION& operator=(clear_type*)
803 {
804 this->clear();
805 return *this;
806 }
807#else
808 BOOST_FUNCTION_FUNCTION& operator=(int zero)
809 {
810 BOOST_ASSERT(zero == 0);
811 this->clear();
812 return *this;
813 }
814#endif
815
816 // Assignment from another BOOST_FUNCTION_FUNCTION
817 BOOST_FUNCTION_FUNCTION& operator=(const BOOST_FUNCTION_FUNCTION& f)
818 {
819 if (&f == this)
820 return *this;
821
822 this->clear();
823 BOOST_TRY {
824 this->assign_to_own(f);
825 } BOOST_CATCH (...) {
826 vtable = 0;
827 BOOST_RETHROW;
828 }
829 BOOST_CATCH_END
830 return *this;
831 }
832
833#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
834 // Move assignment from another BOOST_FUNCTION_FUNCTION
835 BOOST_FUNCTION_FUNCTION& operator=(BOOST_FUNCTION_FUNCTION&& f)
836 {
837 if (&f == this)
838 return *this;
839
840 this->clear();
841 BOOST_TRY {
842 this->move_assign(f);
843 } BOOST_CATCH (...) {
844 vtable = 0;
845 BOOST_RETHROW;
846 }
847 BOOST_CATCH_END
848 return *this;
849 }
850#endif
851
852 void swap(BOOST_FUNCTION_FUNCTION& other)
853 {
854 if (&other == this)
855 return;
856
857 BOOST_FUNCTION_FUNCTION tmp;
858 tmp.move_assign(*this);
859 this->move_assign(other);
860 other.move_assign(tmp);
861 }
862
863 // Clear out a target, if there is one
864 void clear()
865 {
866 if (vtable) {
867 if (!this->has_trivial_copy_and_destroy())
868 get_vtable()->clear(this->functor);
869 vtable = 0;
870 }
871 }
872
873#if (defined __SUNPRO_CC) && (__SUNPRO_CC <= 0x530) && !(defined BOOST_NO_COMPILER_CONFIG)
874 // Sun C++ 5.3 can't handle the safe_bool idiom, so don't use it
875 operator bool () const { return !this->empty(); }
876#else
877 private:
878 struct dummy {
879 void nonnull() {}
880 };
881
882 typedef void (dummy::*safe_bool)();
883
884 public:
885 operator safe_bool () const
886 { return (this->empty())? 0 : &dummy::nonnull; }
887
888 bool operator!() const
889 { return this->empty(); }
890#endif
891
892 private:
893 void assign_to_own(const BOOST_FUNCTION_FUNCTION& f)
894 {
895 if (!f.empty()) {
896 this->vtable = f.vtable;
897 if (this->has_trivial_copy_and_destroy())
898 this->functor = f.functor;
899 else
900 get_vtable()->base.manager(f.functor, this->functor,
901 boost::detail::function::clone_functor_tag);
902 }
903 }
904
905 template<typename Functor>
906 void assign_to(Functor f)
907 {
908 using boost::detail::function::vtable_base;
909
910 typedef typename boost::detail::function::get_function_tag<Functor>::type tag;
911 typedef boost::detail::function::BOOST_FUNCTION_GET_INVOKER<tag> get_invoker;
912 typedef typename get_invoker::
913 template apply<Functor, R BOOST_FUNCTION_COMMA
914 BOOST_FUNCTION_TEMPLATE_ARGS>
915 handler_type;
916
917 typedef typename handler_type::invoker_type invoker_type;
918 typedef typename handler_type::manager_type manager_type;
919
920 // Note: it is extremely important that this initialization use
921 // static initialization. Otherwise, we will have a race
922 // condition here in multi-threaded code. See
923 // http://thread.gmane.org/gmane.comp.lib.boost.devel/164902/.
924 static const vtable_type stored_vtable =
925 { { &manager_type::manage }, &invoker_type::invoke };
926
927 if (stored_vtable.assign_to(f, functor)) {
928 std::size_t value = reinterpret_cast<std::size_t>(&stored_vtable.base);
929 // coverity[pointless_expression]: suppress coverity warnings on apparant if(const).
930 if (boost::has_trivial_copy_constructor<Functor>::value &&
931 boost::has_trivial_destructor<Functor>::value &&
932 boost::detail::function::function_allows_small_object_optimization<Functor>::value)
933 value |= static_cast<std::size_t>(0x01);
934 vtable = reinterpret_cast<boost::detail::function::vtable_base *>(value);
935 } else
936 vtable = 0;
937 }
938
939 template<typename Functor,typename Allocator>
940 void assign_to_a(Functor f,Allocator a)
941 {
942 using boost::detail::function::vtable_base;
943
944 typedef typename boost::detail::function::get_function_tag<Functor>::type tag;
945 typedef boost::detail::function::BOOST_FUNCTION_GET_INVOKER<tag> get_invoker;
946 typedef typename get_invoker::
947 template apply_a<Functor, R BOOST_FUNCTION_COMMA
948 BOOST_FUNCTION_TEMPLATE_ARGS,
949 Allocator>
950 handler_type;
951
952 typedef typename handler_type::invoker_type invoker_type;
953 typedef typename handler_type::manager_type manager_type;
954
955 // Note: it is extremely important that this initialization use
956 // static initialization. Otherwise, we will have a race
957 // condition here in multi-threaded code. See
958 // http://thread.gmane.org/gmane.comp.lib.boost.devel/164902/.
959 static const vtable_type stored_vtable =
960 { { &manager_type::manage }, &invoker_type::invoke };
961
962 if (stored_vtable.assign_to_a(f, functor, a)) {
963 std::size_t value = reinterpret_cast<std::size_t>(&stored_vtable.base);
964 // coverity[pointless_expression]: suppress coverity warnings on apparant if(const).
965 if (boost::has_trivial_copy_constructor<Functor>::value &&
966 boost::has_trivial_destructor<Functor>::value &&
967 boost::detail::function::function_allows_small_object_optimization<Functor>::value)
968 value |= static_cast<std::size_t>(0x01);
969 vtable = reinterpret_cast<boost::detail::function::vtable_base *>(value);
970 } else
971 vtable = 0;
972 }
973
974 // Moves the value from the specified argument to *this. If the argument
975 // has its function object allocated on the heap, move_assign will pass
976 // its buffer to *this, and set the argument's buffer pointer to NULL.
977 void move_assign(BOOST_FUNCTION_FUNCTION& f)
978 {
979 if (&f == this)
980 return;
981
982 BOOST_TRY {
983 if (!f.empty()) {
984 this->vtable = f.vtable;
985 if (this->has_trivial_copy_and_destroy())
986 this->functor = f.functor;
987 else
988 get_vtable()->base.manager(f.functor, this->functor,
989 boost::detail::function::move_functor_tag);
990 f.vtable = 0;
991 } else {
992 clear();
993 }
994 } BOOST_CATCH (...) {
995 vtable = 0;
996 BOOST_RETHROW;
997 }
998 BOOST_CATCH_END
999 }
1000 };
1001
1002 template<typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS>
1003 inline void swap(BOOST_FUNCTION_FUNCTION<
1004 R BOOST_FUNCTION_COMMA
1005 BOOST_FUNCTION_TEMPLATE_ARGS
1006 >& f1,
1007 BOOST_FUNCTION_FUNCTION<
1008 R BOOST_FUNCTION_COMMA
1009 BOOST_FUNCTION_TEMPLATE_ARGS
1010 >& f2)
1011 {
1012 f1.swap(f2);
1013 }
1014
1015// Poison comparisons between boost::function objects of the same type.
1016template<typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS>
1017 void operator==(const BOOST_FUNCTION_FUNCTION<
1018 R BOOST_FUNCTION_COMMA
1019 BOOST_FUNCTION_TEMPLATE_ARGS>&,
1020 const BOOST_FUNCTION_FUNCTION<
1021 R BOOST_FUNCTION_COMMA
1022 BOOST_FUNCTION_TEMPLATE_ARGS>&);
1023template<typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS>
1024 void operator!=(const BOOST_FUNCTION_FUNCTION<
1025 R BOOST_FUNCTION_COMMA
1026 BOOST_FUNCTION_TEMPLATE_ARGS>&,
1027 const BOOST_FUNCTION_FUNCTION<
1028 R BOOST_FUNCTION_COMMA
1029 BOOST_FUNCTION_TEMPLATE_ARGS>& );
1030
1031#if !defined(BOOST_FUNCTION_NO_FUNCTION_TYPE_SYNTAX)
1032
1033#if BOOST_FUNCTION_NUM_ARGS == 0
1034#define BOOST_FUNCTION_PARTIAL_SPEC R (void)
1035#else
1036#define BOOST_FUNCTION_PARTIAL_SPEC R (BOOST_PP_ENUM_PARAMS(BOOST_FUNCTION_NUM_ARGS,T))
1037#endif
1038
1039template<typename R BOOST_FUNCTION_COMMA
1040 BOOST_FUNCTION_TEMPLATE_PARMS>
1041class function<BOOST_FUNCTION_PARTIAL_SPEC>
1042 : public BOOST_FUNCTION_FUNCTION<R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_ARGS>
1043{
1044 typedef BOOST_FUNCTION_FUNCTION<R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_ARGS> base_type;
1045 typedef function self_type;
1046
1047 struct clear_type {};
1048
1049public:
1050
1051 function() : base_type() {}
1052
1053 template<typename Functor>
1054 function(Functor f
1055#ifndef BOOST_NO_SFINAE
1056 ,typename boost::enable_if_c<
1057 !(is_integral<Functor>::value),
1058 int>::type = 0
1059#endif
1060 ) :
1061 base_type(f)
1062 {
1063 }
1064 template<typename Functor,typename Allocator>
1065 function(Functor f, Allocator a
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,a)
1073 {
1074 }
1075
1076#ifndef BOOST_NO_SFINAE
1077 function(clear_type*) : base_type() {}
1078#endif
1079
1080 function(const self_type& f) : base_type(static_cast<const base_type&>(f)){}
1081
1082 function(const base_type& f) : base_type(static_cast<const base_type&>(f)){}
1083
1084#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
1085 // Move constructors
1086 function(self_type&& f): base_type(static_cast<base_type&&>(f)){}
1087 function(base_type&& f): base_type(static_cast<base_type&&>(f)){}
1088#endif
1089
1090 self_type& operator=(const self_type& f)
1091 {
1092 self_type(f).swap(*this);
1093 return *this;
1094 }
1095
1096#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
1097 self_type& operator=(self_type&& f)
1098 {
1099 self_type(static_cast<self_type&&>(f)).swap(*this);
1100 return *this;
1101 }
1102#endif
1103
1104 template<typename Functor>
1105#ifndef BOOST_NO_SFINAE
1106 typename boost::enable_if_c<
1107 !(is_integral<Functor>::value),
1108 self_type&>::type
1109#else
1110 self_type&
1111#endif
1112 operator=(Functor f)
1113 {
1114 self_type(f).swap(*this);
1115 return *this;
1116 }
1117
1118#ifndef BOOST_NO_SFINAE
1119 self_type& operator=(clear_type*)
1120 {
1121 this->clear();
1122 return *this;
1123 }
1124#endif
1125
1126 self_type& operator=(const base_type& f)
1127 {
1128 self_type(f).swap(*this);
1129 return *this;
1130 }
1131
1132#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
1133 self_type& operator=(base_type&& f)
1134 {
1135 self_type(static_cast<base_type&&>(f)).swap(*this);
1136 return *this;
1137 }
1138#endif
1139};
1140
1141#undef BOOST_FUNCTION_PARTIAL_SPEC
1142#endif // have partial specialization
1143
1144} // end namespace boost
1145
1146// Cleanup after ourselves...
1147#undef BOOST_FUNCTION_VTABLE
1148#undef BOOST_FUNCTION_COMMA
1149#undef BOOST_FUNCTION_FUNCTION
1150#undef BOOST_FUNCTION_FUNCTION_INVOKER
1151#undef BOOST_FUNCTION_VOID_FUNCTION_INVOKER
1152#undef BOOST_FUNCTION_FUNCTION_OBJ_INVOKER
1153#undef BOOST_FUNCTION_VOID_FUNCTION_OBJ_INVOKER
1154#undef BOOST_FUNCTION_FUNCTION_REF_INVOKER
1155#undef BOOST_FUNCTION_VOID_FUNCTION_REF_INVOKER
1156#undef BOOST_FUNCTION_MEMBER_INVOKER
1157#undef BOOST_FUNCTION_VOID_MEMBER_INVOKER
1158#undef BOOST_FUNCTION_GET_FUNCTION_INVOKER
1159#undef BOOST_FUNCTION_GET_FUNCTION_OBJ_INVOKER
1160#undef BOOST_FUNCTION_GET_FUNCTION_REF_INVOKER
1161#undef BOOST_FUNCTION_GET_MEM_FUNCTION_INVOKER
1162#undef BOOST_FUNCTION_GET_INVOKER
1163#undef BOOST_FUNCTION_TEMPLATE_PARMS
1164#undef BOOST_FUNCTION_TEMPLATE_ARGS
1165#undef BOOST_FUNCTION_PARMS
1166#undef BOOST_FUNCTION_PARM
1167#ifdef BOOST_FUNCTION_ARG
1168# undef BOOST_FUNCTION_ARG
1169#endif
1170#undef BOOST_FUNCTION_ARGS
1171#undef BOOST_FUNCTION_ARG_TYPE
1172#undef BOOST_FUNCTION_ARG_TYPES
1173#undef BOOST_FUNCTION_VOID_RETURN_TYPE
1174#undef BOOST_FUNCTION_RETURN
1175
1176#if defined(BOOST_MSVC)
1177# pragma warning( pop )
1178#endif
1179