1 // TR1 functional header -*- C++ -*-
3 // Copyright (C) 2007, 2008 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 2, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING. If not, write to the Free
18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
21 // As a special exception, you may use this file as part of a free software
22 // library without restriction. Specifically, if other files instantiate
23 // templates or use macros or inline functions from this file, or you compile
24 // this file and link it with other files to produce an executable, this
25 // file does not by itself cause the resulting executable to be covered by
26 // the GNU General Public License. This exception does not however
27 // invalidate any other reasons why the executable file might be covered by
28 // the GNU General Public License.
30 /** @file tr1_impl/functional
31 * This is an internal header file, included by other library headers.
32 * You should not attempt to use it directly.
37 _GLIBCXX_BEGIN_NAMESPACE_TR1
39 template<typename _MemberPointer>
43 * Actual implementation of _Has_result_type, which uses SFINAE to
44 * determine if the type _Tp has a publicly-accessible member type
47 template<typename _Tp>
48 class _Has_result_type_helper : __sfinae_types
50 template<typename _Up>
54 template<typename _Up>
55 static __one __test(_Wrap_type<typename _Up::result_type>*);
57 template<typename _Up>
58 static __two __test(...);
61 static const bool value = sizeof(__test<_Tp>(0)) == 1;
64 template<typename _Tp>
65 struct _Has_result_type
66 : integral_constant<bool,
67 _Has_result_type_helper<typename remove_cv<_Tp>::type>::value>
73 /// If we have found a result_type, extract it.
74 template<bool _Has_result_type, typename _Functor>
75 struct _Maybe_get_result_type
78 template<typename _Functor>
79 struct _Maybe_get_result_type<true, _Functor>
81 typedef typename _Functor::result_type result_type;
85 * Base class for any function object that has a weak result type, as
86 * defined in 3.3/3 of TR1.
88 template<typename _Functor>
89 struct _Weak_result_type_impl
90 : _Maybe_get_result_type<_Has_result_type<_Functor>::value, _Functor>
94 /// Retrieve the result type for a function type.
95 template<typename _Res, typename... _ArgTypes>
96 struct _Weak_result_type_impl<_Res(_ArgTypes...)>
98 typedef _Res result_type;
101 /// Retrieve the result type for a function reference.
102 template<typename _Res, typename... _ArgTypes>
103 struct _Weak_result_type_impl<_Res(&)(_ArgTypes...)>
105 typedef _Res result_type;
108 /// Retrieve the result type for a function pointer.
109 template<typename _Res, typename... _ArgTypes>
110 struct _Weak_result_type_impl<_Res(*)(_ArgTypes...)>
112 typedef _Res result_type;
115 /// Retrieve result type for a member function pointer.
116 template<typename _Res, typename _Class, typename... _ArgTypes>
117 struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)>
119 typedef _Res result_type;
122 /// Retrieve result type for a const member function pointer.
123 template<typename _Res, typename _Class, typename... _ArgTypes>
124 struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) const>
126 typedef _Res result_type;
129 /// Retrieve result type for a volatile member function pointer.
130 template<typename _Res, typename _Class, typename... _ArgTypes>
131 struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) volatile>
133 typedef _Res result_type;
136 /// Retrieve result type for a const volatile member function pointer.
137 template<typename _Res, typename _Class, typename... _ArgTypes>
138 struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)const volatile>
140 typedef _Res result_type;
144 * Strip top-level cv-qualifiers from the function object and let
145 * _Weak_result_type_impl perform the real work.
147 template<typename _Functor>
148 struct _Weak_result_type
149 : _Weak_result_type_impl<typename remove_cv<_Functor>::type>
153 template<typename _Signature>
157 * Actual implementation of result_of. When _Has_result_type is
158 * true, gets its result from _Weak_result_type. Otherwise, uses
159 * the function object's member template result to extract the
162 template<bool _Has_result_type, typename _Signature>
163 struct _Result_of_impl;
165 // Handle member data pointers using _Mem_fn's logic
166 template<typename _Res, typename _Class, typename _T1>
167 struct _Result_of_impl<false, _Res _Class::*(_T1)>
169 typedef typename _Mem_fn<_Res _Class::*>
170 ::template _Result_type<_T1>::type type;
174 * Determine whether we can determine a result type from @c Functor
177 template<typename _Functor, typename... _ArgTypes>
178 class result_of<_Functor(_ArgTypes...)>
179 : public _Result_of_impl<
180 _Has_result_type<_Weak_result_type<_Functor> >::value,
181 _Functor(_ArgTypes...)>
185 /// We already know the result type for @c Functor; use it.
186 template<typename _Functor, typename... _ArgTypes>
187 struct _Result_of_impl<true, _Functor(_ArgTypes...)>
189 typedef typename _Weak_result_type<_Functor>::result_type type;
193 * We need to compute the result type for this invocation the hard
196 template<typename _Functor, typename... _ArgTypes>
197 struct _Result_of_impl<false, _Functor(_ArgTypes...)>
199 typedef typename _Functor
200 ::template result<_Functor(_ArgTypes...)>::type type;
204 * It is unsafe to access ::result when there are zero arguments, so we
205 * return @c void instead.
207 template<typename _Functor>
208 struct _Result_of_impl<false, _Functor()>
213 /// Determines if the type _Tp derives from unary_function.
214 template<typename _Tp>
215 struct _Derives_from_unary_function : __sfinae_types
218 template<typename _T1, typename _Res>
219 static __one __test(const volatile unary_function<_T1, _Res>*);
221 // It's tempting to change "..." to const volatile void*, but
222 // that fails when _Tp is a function type.
223 static __two __test(...);
226 static const bool value = sizeof(__test((_Tp*)0)) == 1;
229 /// Determines if the type _Tp derives from binary_function.
230 template<typename _Tp>
231 struct _Derives_from_binary_function : __sfinae_types
234 template<typename _T1, typename _T2, typename _Res>
235 static __one __test(const volatile binary_function<_T1, _T2, _Res>*);
237 // It's tempting to change "..." to const volatile void*, but
238 // that fails when _Tp is a function type.
239 static __two __test(...);
242 static const bool value = sizeof(__test((_Tp*)0)) == 1;
245 /// Turns a function type into a function pointer type
246 template<typename _Tp, bool _IsFunctionType = is_function<_Tp>::value>
247 struct _Function_to_function_pointer
252 template<typename _Tp>
253 struct _Function_to_function_pointer<_Tp, true>
259 * Invoke a function object, which may be either a member pointer or a
260 * function object. The first parameter will tell which.
262 template<typename _Functor, typename... _Args>
264 typename __gnu_cxx::__enable_if<
265 (!is_member_pointer<_Functor>::value
266 && !is_function<_Functor>::value
267 && !is_function<typename remove_pointer<_Functor>::type>::value),
268 typename result_of<_Functor(_Args...)>::type
270 __invoke(_Functor& __f, _Args&... __args)
272 return __f(__args...);
275 template<typename _Functor, typename... _Args>
277 typename __gnu_cxx::__enable_if<
278 (is_member_pointer<_Functor>::value
279 && !is_function<_Functor>::value
280 && !is_function<typename remove_pointer<_Functor>::type>::value),
281 typename result_of<_Functor(_Args...)>::type
283 __invoke(_Functor& __f, _Args&... __args)
285 return mem_fn(__f)(__args...);
288 // To pick up function references (that will become function pointers)
289 template<typename _Functor, typename... _Args>
291 typename __gnu_cxx::__enable_if<
292 (is_pointer<_Functor>::value
293 && is_function<typename remove_pointer<_Functor>::type>::value),
294 typename result_of<_Functor(_Args...)>::type
296 __invoke(_Functor __f, _Args&... __args)
298 return __f(__args...);
302 * Knowing which of unary_function and binary_function _Tp derives
303 * from, derives from the same and ensures that reference_wrapper
304 * will have a weak result type. See cases below.
306 template<bool _Unary, bool _Binary, typename _Tp>
307 struct _Reference_wrapper_base_impl;
309 // Not a unary_function or binary_function, so try a weak result type.
310 template<typename _Tp>
311 struct _Reference_wrapper_base_impl<false, false, _Tp>
312 : _Weak_result_type<_Tp>
315 // unary_function but not binary_function
316 template<typename _Tp>
317 struct _Reference_wrapper_base_impl<true, false, _Tp>
318 : unary_function<typename _Tp::argument_type,
319 typename _Tp::result_type>
322 // binary_function but not unary_function
323 template<typename _Tp>
324 struct _Reference_wrapper_base_impl<false, true, _Tp>
325 : binary_function<typename _Tp::first_argument_type,
326 typename _Tp::second_argument_type,
327 typename _Tp::result_type>
330 // Both unary_function and binary_function. Import result_type to
332 template<typename _Tp>
333 struct _Reference_wrapper_base_impl<true, true, _Tp>
334 : unary_function<typename _Tp::argument_type,
335 typename _Tp::result_type>,
336 binary_function<typename _Tp::first_argument_type,
337 typename _Tp::second_argument_type,
338 typename _Tp::result_type>
340 typedef typename _Tp::result_type result_type;
344 * Derives from unary_function or binary_function when it
345 * can. Specializations handle all of the easy cases. The primary
346 * template determines what to do with a class type, which may
347 * derive from both unary_function and binary_function.
349 template<typename _Tp>
350 struct _Reference_wrapper_base
351 : _Reference_wrapper_base_impl<
352 _Derives_from_unary_function<_Tp>::value,
353 _Derives_from_binary_function<_Tp>::value,
357 // - a function type (unary)
358 template<typename _Res, typename _T1>
359 struct _Reference_wrapper_base<_Res(_T1)>
360 : unary_function<_T1, _Res>
363 // - a function type (binary)
364 template<typename _Res, typename _T1, typename _T2>
365 struct _Reference_wrapper_base<_Res(_T1, _T2)>
366 : binary_function<_T1, _T2, _Res>
369 // - a function pointer type (unary)
370 template<typename _Res, typename _T1>
371 struct _Reference_wrapper_base<_Res(*)(_T1)>
372 : unary_function<_T1, _Res>
375 // - a function pointer type (binary)
376 template<typename _Res, typename _T1, typename _T2>
377 struct _Reference_wrapper_base<_Res(*)(_T1, _T2)>
378 : binary_function<_T1, _T2, _Res>
381 // - a pointer to member function type (unary, no qualifiers)
382 template<typename _Res, typename _T1>
383 struct _Reference_wrapper_base<_Res (_T1::*)()>
384 : unary_function<_T1*, _Res>
387 // - a pointer to member function type (binary, no qualifiers)
388 template<typename _Res, typename _T1, typename _T2>
389 struct _Reference_wrapper_base<_Res (_T1::*)(_T2)>
390 : binary_function<_T1*, _T2, _Res>
393 // - a pointer to member function type (unary, const)
394 template<typename _Res, typename _T1>
395 struct _Reference_wrapper_base<_Res (_T1::*)() const>
396 : unary_function<const _T1*, _Res>
399 // - a pointer to member function type (binary, const)
400 template<typename _Res, typename _T1, typename _T2>
401 struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const>
402 : binary_function<const _T1*, _T2, _Res>
405 // - a pointer to member function type (unary, volatile)
406 template<typename _Res, typename _T1>
407 struct _Reference_wrapper_base<_Res (_T1::*)() volatile>
408 : unary_function<volatile _T1*, _Res>
411 // - a pointer to member function type (binary, volatile)
412 template<typename _Res, typename _T1, typename _T2>
413 struct _Reference_wrapper_base<_Res (_T1::*)(_T2) volatile>
414 : binary_function<volatile _T1*, _T2, _Res>
417 // - a pointer to member function type (unary, const volatile)
418 template<typename _Res, typename _T1>
419 struct _Reference_wrapper_base<_Res (_T1::*)() const volatile>
420 : unary_function<const volatile _T1*, _Res>
423 // - a pointer to member function type (binary, const volatile)
424 template<typename _Res, typename _T1, typename _T2>
425 struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const volatile>
426 : binary_function<const volatile _T1*, _T2, _Res>
429 /// reference_wrapper
430 template<typename _Tp>
431 class reference_wrapper
432 : public _Reference_wrapper_base<typename remove_cv<_Tp>::type>
434 // If _Tp is a function type, we can't form result_of<_Tp(...)>,
435 // so turn it into a function pointer type.
436 typedef typename _Function_to_function_pointer<_Tp>::type
444 reference_wrapper(_Tp& __indata): _M_data(&__indata)
447 reference_wrapper(const reference_wrapper<_Tp>& __inref):
448 _M_data(__inref._M_data)
452 operator=(const reference_wrapper<_Tp>& __inref)
454 _M_data = __inref._M_data;
458 operator _Tp&() const
459 { return this->get(); }
465 template<typename... _Args>
466 typename result_of<_M_func_type(_Args...)>::type
467 operator()(_Args&... __args) const
469 return __invoke(get(), __args...);
474 // Denotes a reference should be taken to a variable.
475 template<typename _Tp>
476 inline reference_wrapper<_Tp>
478 { return reference_wrapper<_Tp>(__t); }
480 // Denotes a const reference should be taken to a variable.
481 template<typename _Tp>
482 inline reference_wrapper<const _Tp>
484 { return reference_wrapper<const _Tp>(__t); }
486 template<typename _Tp>
487 inline reference_wrapper<_Tp>
488 ref(reference_wrapper<_Tp> __t)
489 { return ref(__t.get()); }
491 template<typename _Tp>
492 inline reference_wrapper<const _Tp>
493 cref(reference_wrapper<_Tp> __t)
494 { return cref(__t.get()); }
496 template<typename _Tp, bool>
497 struct _Mem_fn_const_or_non
499 typedef const _Tp& type;
502 template<typename _Tp>
503 struct _Mem_fn_const_or_non<_Tp, false>
509 * Derives from @c unary_function or @c binary_function, or perhaps
510 * nothing, depending on the number of arguments provided. The
511 * primary template is the basis case, which derives nothing.
513 template<typename _Res, typename... _ArgTypes>
514 struct _Maybe_unary_or_binary_function { };
516 /// Derives from @c unary_function, as appropriate.
517 template<typename _Res, typename _T1>
518 struct _Maybe_unary_or_binary_function<_Res, _T1>
519 : std::unary_function<_T1, _Res> { };
521 /// Derives from @c binary_function, as appropriate.
522 template<typename _Res, typename _T1, typename _T2>
523 struct _Maybe_unary_or_binary_function<_Res, _T1, _T2>
524 : std::binary_function<_T1, _T2, _Res> { };
526 /// Implementation of @c mem_fn for member function pointers.
527 template<typename _Res, typename _Class, typename... _ArgTypes>
528 class _Mem_fn<_Res (_Class::*)(_ArgTypes...)>
529 : public _Maybe_unary_or_binary_function<_Res, _Class*, _ArgTypes...>
531 typedef _Res (_Class::*_Functor)(_ArgTypes...);
533 template<typename _Tp>
535 _M_call(_Tp& __object, const volatile _Class *,
536 _ArgTypes... __args) const
537 { return (__object.*__pmf)(__args...); }
539 template<typename _Tp>
541 _M_call(_Tp& __ptr, const volatile void *, _ArgTypes... __args) const
542 { return ((*__ptr).*__pmf)(__args...); }
545 typedef _Res result_type;
547 explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
551 operator()(_Class& __object, _ArgTypes... __args) const
552 { return (__object.*__pmf)(__args...); }
556 operator()(_Class* __object, _ArgTypes... __args) const
557 { return (__object->*__pmf)(__args...); }
559 // Handle smart pointers, references and pointers to derived
560 template<typename _Tp>
562 operator()(_Tp& __object, _ArgTypes... __args) const
563 { return _M_call(__object, &__object, __args...); }
569 /// Implementation of @c mem_fn for const member function pointers.
570 template<typename _Res, typename _Class, typename... _ArgTypes>
571 class _Mem_fn<_Res (_Class::*)(_ArgTypes...) const>
572 : public _Maybe_unary_or_binary_function<_Res, const _Class*,
575 typedef _Res (_Class::*_Functor)(_ArgTypes...) const;
577 template<typename _Tp>
579 _M_call(_Tp& __object, const volatile _Class *,
580 _ArgTypes... __args) const
581 { return (__object.*__pmf)(__args...); }
583 template<typename _Tp>
585 _M_call(_Tp& __ptr, const volatile void *, _ArgTypes... __args) const
586 { return ((*__ptr).*__pmf)(__args...); }
589 typedef _Res result_type;
591 explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
595 operator()(const _Class& __object, _ArgTypes... __args) const
596 { return (__object.*__pmf)(__args...); }
600 operator()(const _Class* __object, _ArgTypes... __args) const
601 { return (__object->*__pmf)(__args...); }
603 // Handle smart pointers, references and pointers to derived
604 template<typename _Tp>
605 _Res operator()(_Tp& __object, _ArgTypes... __args) const
606 { return _M_call(__object, &__object, __args...); }
612 /// Implementation of @c mem_fn for volatile member function pointers.
613 template<typename _Res, typename _Class, typename... _ArgTypes>
614 class _Mem_fn<_Res (_Class::*)(_ArgTypes...) volatile>
615 : public _Maybe_unary_or_binary_function<_Res, volatile _Class*,
618 typedef _Res (_Class::*_Functor)(_ArgTypes...) volatile;
620 template<typename _Tp>
622 _M_call(_Tp& __object, const volatile _Class *,
623 _ArgTypes... __args) const
624 { return (__object.*__pmf)(__args...); }
626 template<typename _Tp>
628 _M_call(_Tp& __ptr, const volatile void *, _ArgTypes... __args) const
629 { return ((*__ptr).*__pmf)(__args...); }
632 typedef _Res result_type;
634 explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
638 operator()(volatile _Class& __object, _ArgTypes... __args) const
639 { return (__object.*__pmf)(__args...); }
643 operator()(volatile _Class* __object, _ArgTypes... __args) const
644 { return (__object->*__pmf)(__args...); }
646 // Handle smart pointers, references and pointers to derived
647 template<typename _Tp>
649 operator()(_Tp& __object, _ArgTypes... __args) const
650 { return _M_call(__object, &__object, __args...); }
656 /// Implementation of @c mem_fn for const volatile member function pointers.
657 template<typename _Res, typename _Class, typename... _ArgTypes>
658 class _Mem_fn<_Res (_Class::*)(_ArgTypes...) const volatile>
659 : public _Maybe_unary_or_binary_function<_Res, const volatile _Class*,
662 typedef _Res (_Class::*_Functor)(_ArgTypes...) const volatile;
664 template<typename _Tp>
666 _M_call(_Tp& __object, const volatile _Class *,
667 _ArgTypes... __args) const
668 { return (__object.*__pmf)(__args...); }
670 template<typename _Tp>
672 _M_call(_Tp& __ptr, const volatile void *, _ArgTypes... __args) const
673 { return ((*__ptr).*__pmf)(__args...); }
676 typedef _Res result_type;
678 explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
682 operator()(const volatile _Class& __object, _ArgTypes... __args) const
683 { return (__object.*__pmf)(__args...); }
687 operator()(const volatile _Class* __object, _ArgTypes... __args) const
688 { return (__object->*__pmf)(__args...); }
690 // Handle smart pointers, references and pointers to derived
691 template<typename _Tp>
692 _Res operator()(_Tp& __object, _ArgTypes... __args) const
693 { return _M_call(__object, &__object, __args...); }
700 template<typename _Res, typename _Class>
701 class _Mem_fn<_Res _Class::*>
703 // This bit of genius is due to Peter Dimov, improved slightly by
705 template<typename _Tp>
707 _M_call(_Tp& __object, _Class *) const
708 { return __object.*__pm; }
710 template<typename _Tp, typename _Up>
712 _M_call(_Tp& __object, _Up * const *) const
713 { return (*__object).*__pm; }
715 template<typename _Tp, typename _Up>
717 _M_call(_Tp& __object, const _Up * const *) const
718 { return (*__object).*__pm; }
720 template<typename _Tp>
722 _M_call(_Tp& __object, const _Class *) const
723 { return __object.*__pm; }
725 template<typename _Tp>
727 _M_call(_Tp& __ptr, const volatile void*) const
728 { return (*__ptr).*__pm; }
730 template<typename _Tp> static _Tp& __get_ref();
732 template<typename _Tp>
733 static __sfinae_types::__one __check_const(_Tp&, _Class*);
734 template<typename _Tp, typename _Up>
735 static __sfinae_types::__one __check_const(_Tp&, _Up * const *);
736 template<typename _Tp, typename _Up>
737 static __sfinae_types::__two __check_const(_Tp&, const _Up * const *);
738 template<typename _Tp>
739 static __sfinae_types::__two __check_const(_Tp&, const _Class*);
740 template<typename _Tp>
741 static __sfinae_types::__two __check_const(_Tp&, const volatile void*);
744 template<typename _Tp>
746 : _Mem_fn_const_or_non<_Res,
747 (sizeof(__sfinae_types::__two)
748 == sizeof(__check_const<_Tp>(__get_ref<_Tp>(), (_Tp*)0)))>
751 template<typename _Signature>
754 template<typename _CVMem, typename _Tp>
755 struct result<_CVMem(_Tp)>
756 : public _Result_type<_Tp> { };
758 template<typename _CVMem, typename _Tp>
759 struct result<_CVMem(_Tp&)>
760 : public _Result_type<_Tp> { };
763 _Mem_fn(_Res _Class::*__pm) : __pm(__pm) { }
767 operator()(_Class& __object) const
768 { return __object.*__pm; }
771 operator()(const _Class& __object) const
772 { return __object.*__pm; }
776 operator()(_Class* __object) const
777 { return __object->*__pm; }
780 operator()(const _Class* __object) const
781 { return __object->*__pm; }
783 // Handle smart pointers and derived
784 template<typename _Tp>
785 typename _Result_type<_Tp>::type
786 operator()(_Tp& __unknown) const
787 { return _M_call(__unknown, &__unknown); }
794 * @brief Returns a function object that forwards to the member
797 template<typename _Tp, typename _Class>
798 inline _Mem_fn<_Tp _Class::*>
799 mem_fn(_Tp _Class::* __pm)
801 return _Mem_fn<_Tp _Class::*>(__pm);
805 * @brief Determines if the given type _Tp is a function object
806 * should be treated as a subexpression when evaluating calls to
807 * function objects returned by bind(). [TR1 3.6.1]
809 template<typename _Tp>
810 struct is_bind_expression
811 { static const bool value = false; };
813 template<typename _Tp>
814 const bool is_bind_expression<_Tp>::value;
817 * @brief Determines if the given type _Tp is a placeholder in a
818 * bind() expression and, if so, which placeholder it is. [TR1 3.6.2]
820 template<typename _Tp>
821 struct is_placeholder
822 { static const int value = 0; };
824 template<typename _Tp>
825 const int is_placeholder<_Tp>::value;
827 /// The type of placeholder objects defined by libstdc++.
828 template<int _Num> struct _Placeholder { };
830 // Define a large number of placeholders. There is no way to
831 // simplify this with variadic templates, because we're introducing
832 // unique names for each.
833 namespace placeholders
846 _Placeholder<10> _10;
847 _Placeholder<11> _11;
848 _Placeholder<12> _12;
849 _Placeholder<13> _13;
850 _Placeholder<14> _14;
851 _Placeholder<15> _15;
852 _Placeholder<16> _16;
853 _Placeholder<17> _17;
854 _Placeholder<18> _18;
855 _Placeholder<19> _19;
856 _Placeholder<20> _20;
857 _Placeholder<21> _21;
858 _Placeholder<22> _22;
859 _Placeholder<23> _23;
860 _Placeholder<24> _24;
861 _Placeholder<25> _25;
862 _Placeholder<26> _26;
863 _Placeholder<27> _27;
864 _Placeholder<28> _28;
865 _Placeholder<29> _29;
870 * Partial specialization of is_placeholder that provides the placeholder
871 * number for the placeholder objects defined by libstdc++.
874 struct is_placeholder<_Placeholder<_Num> >
875 { static const int value = _Num; };
878 const int is_placeholder<_Placeholder<_Num> >::value;
881 * Stores a tuple of indices. Used by bind() to extract the elements
884 template<int... _Indexes>
885 struct _Index_tuple { };
887 /// Builds an _Index_tuple<0, 1, 2, ..., _Num-1>.
888 template<std::size_t _Num, typename _Tuple = _Index_tuple<> >
889 struct _Build_index_tuple;
891 template<std::size_t _Num, int... _Indexes>
892 struct _Build_index_tuple<_Num, _Index_tuple<_Indexes...> >
893 : _Build_index_tuple<_Num - 1,
894 _Index_tuple<_Indexes..., sizeof...(_Indexes)> >
898 template<int... _Indexes>
899 struct _Build_index_tuple<0, _Index_tuple<_Indexes...> >
901 typedef _Index_tuple<_Indexes...> __type;
905 * Used by _Safe_tuple_element to indicate that there is no tuple
906 * element at this position.
908 struct _No_tuple_element;
911 * Implementation helper for _Safe_tuple_element. This primary
912 * template handles the case where it is safe to use @c
915 template<int __i, typename _Tuple, bool _IsSafe>
916 struct _Safe_tuple_element_impl
917 : tuple_element<__i, _Tuple> { };
920 * Implementation helper for _Safe_tuple_element. This partial
921 * specialization handles the case where it is not safe to use @c
922 * tuple_element. We just return @c _No_tuple_element.
924 template<int __i, typename _Tuple>
925 struct _Safe_tuple_element_impl<__i, _Tuple, false>
927 typedef _No_tuple_element type;
931 * Like tuple_element, but returns @c _No_tuple_element when
932 * tuple_element would return an error.
934 template<int __i, typename _Tuple>
935 struct _Safe_tuple_element
936 : _Safe_tuple_element_impl<__i, _Tuple,
937 (__i >= 0 && __i < tuple_size<_Tuple>::value)>
942 * Maps an argument to bind() into an actual argument to the bound
943 * function object [TR1 3.6.3/5]. Only the first parameter should
944 * be specified: the rest are used to determine among the various
945 * implementations. Note that, although this class is a function
946 * object, isn't not entirely normal because it takes only two
947 * parameters regardless of the number of parameters passed to the
948 * bind expression. The first parameter is the bound argument and
949 * the second parameter is a tuple containing references to the
950 * rest of the arguments.
952 template<typename _Arg,
953 bool _IsBindExp = is_bind_expression<_Arg>::value,
954 bool _IsPlaceholder = (is_placeholder<_Arg>::value > 0)>
958 * If the argument is reference_wrapper<_Tp>, returns the
959 * underlying reference. [TR1 3.6.3/5 bullet 1]
961 template<typename _Tp>
962 class _Mu<reference_wrapper<_Tp>, false, false>
965 typedef _Tp& result_type;
967 /* Note: This won't actually work for const volatile
968 * reference_wrappers, because reference_wrapper::get() is const
969 * but not volatile-qualified. This might be a defect in the TR.
971 template<typename _CVRef, typename _Tuple>
973 operator()(_CVRef& __arg, const _Tuple&) const volatile
974 { return __arg.get(); }
978 * If the argument is a bind expression, we invoke the underlying
979 * function object with the same cv-qualifiers as we are given and
980 * pass along all of our arguments (unwrapped). [TR1 3.6.3/5 bullet 2]
982 template<typename _Arg>
983 class _Mu<_Arg, true, false>
986 template<typename _Signature> class result;
988 // Determine the result type when we pass the arguments along. This
989 // involves passing along the cv-qualifiers placed on _Mu and
990 // unwrapping the argument bundle.
991 template<typename _CVMu, typename _CVArg, typename... _Args>
992 class result<_CVMu(_CVArg, tuple<_Args...>)>
993 : public result_of<_CVArg(_Args...)> { };
995 template<typename _CVArg, typename... _Args>
996 typename result_of<_CVArg(_Args...)>::type
997 operator()(_CVArg& __arg,
998 const tuple<_Args...>& __tuple) const volatile
1000 // Construct an index tuple and forward to __call
1001 typedef typename _Build_index_tuple<sizeof...(_Args)>::__type
1003 return this->__call(__arg, __tuple, _Indexes());
1007 // Invokes the underlying function object __arg by unpacking all
1008 // of the arguments in the tuple.
1009 template<typename _CVArg, typename... _Args, int... _Indexes>
1010 typename result_of<_CVArg(_Args...)>::type
1011 __call(_CVArg& __arg, const tuple<_Args...>& __tuple,
1012 const _Index_tuple<_Indexes...>&) const volatile
1014 return __arg(_GLIBCXX_TR1 get<_Indexes>(__tuple)...);
1019 * If the argument is a placeholder for the Nth argument, returns
1020 * a reference to the Nth argument to the bind function object.
1021 * [TR1 3.6.3/5 bullet 3]
1023 template<typename _Arg>
1024 class _Mu<_Arg, false, true>
1027 template<typename _Signature> class result;
1029 template<typename _CVMu, typename _CVArg, typename _Tuple>
1030 class result<_CVMu(_CVArg, _Tuple)>
1032 // Add a reference, if it hasn't already been done for us.
1033 // This allows us to be a little bit sloppy in constructing
1034 // the tuple that we pass to result_of<...>.
1035 typedef typename _Safe_tuple_element<(is_placeholder<_Arg>::value
1040 #ifdef _GLIBCXX_INCLUDE_AS_CXX0X
1041 typedef typename add_lvalue_reference<__base_type>::type type;
1043 typedef typename add_reference<__base_type>::type type;
1047 template<typename _Tuple>
1048 typename result<_Mu(_Arg, _Tuple)>::type
1049 operator()(const volatile _Arg&, const _Tuple& __tuple) const volatile
1051 return ::std::_GLIBCXX_TR1 get<(is_placeholder<_Arg>::value
1057 * If the argument is just a value, returns a reference to that
1058 * value. The cv-qualifiers on the reference are the same as the
1059 * cv-qualifiers on the _Mu object. [TR1 3.6.3/5 bullet 4]
1061 template<typename _Arg>
1062 class _Mu<_Arg, false, false>
1065 template<typename _Signature> struct result;
1067 template<typename _CVMu, typename _CVArg, typename _Tuple>
1068 struct result<_CVMu(_CVArg, _Tuple)>
1070 #ifdef _GLIBCXX_INCLUDE_AS_CXX0X
1071 typedef typename add_lvalue_reference<_CVArg>::type type;
1073 typedef typename add_reference<_CVArg>::type type;
1077 // Pick up the cv-qualifiers of the argument
1078 template<typename _CVArg, typename _Tuple>
1080 operator()(_CVArg& __arg, const _Tuple&) const volatile
1085 * Maps member pointers into instances of _Mem_fn but leaves all
1086 * other function objects untouched. Used by tr1::bind(). The
1087 * primary template handles the non--member-pointer case.
1089 template<typename _Tp>
1090 struct _Maybe_wrap_member_pointer
1095 __do_wrap(const _Tp& __x)
1100 * Maps member pointers into instances of _Mem_fn but leaves all
1101 * other function objects untouched. Used by tr1::bind(). This
1102 * partial specialization handles the member pointer case.
1104 template<typename _Tp, typename _Class>
1105 struct _Maybe_wrap_member_pointer<_Tp _Class::*>
1107 typedef _Mem_fn<_Tp _Class::*> type;
1110 __do_wrap(_Tp _Class::* __pm)
1111 { return type(__pm); }
1114 /// Type of the function object returned from bind().
1115 template<typename _Signature>
1118 template<typename _Functor, typename... _Bound_args>
1119 class _Bind<_Functor(_Bound_args...)>
1120 : public _Weak_result_type<_Functor>
1122 typedef _Bind __self_type;
1123 typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type
1127 tuple<_Bound_args...> _M_bound_args;
1130 template<typename... _Args, int... _Indexes>
1132 _Functor(typename result_of<_Mu<_Bound_args>
1133 (_Bound_args, tuple<_Args...>)>::type...)
1135 __call(const tuple<_Args...>& __args, _Index_tuple<_Indexes...>)
1137 return _M_f(_Mu<_Bound_args>()
1138 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1142 template<typename... _Args, int... _Indexes>
1144 const _Functor(typename result_of<_Mu<_Bound_args>
1145 (const _Bound_args, tuple<_Args...>)
1147 __call(const tuple<_Args...>& __args, _Index_tuple<_Indexes...>) const
1149 return _M_f(_Mu<_Bound_args>()
1150 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1154 template<typename... _Args, int... _Indexes>
1156 volatile _Functor(typename result_of<_Mu<_Bound_args>
1157 (volatile _Bound_args, tuple<_Args...>)
1159 __call(const tuple<_Args...>& __args,
1160 _Index_tuple<_Indexes...>) volatile
1162 return _M_f(_Mu<_Bound_args>()
1163 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1166 // Call as const volatile
1167 template<typename... _Args, int... _Indexes>
1169 const volatile _Functor(typename result_of<_Mu<_Bound_args>
1170 (const volatile _Bound_args,
1173 __call(const tuple<_Args...>& __args,
1174 _Index_tuple<_Indexes...>) const volatile
1176 return _M_f(_Mu<_Bound_args>()
1177 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1181 explicit _Bind(_Functor __f, _Bound_args... __bound_args)
1182 : _M_f(__f), _M_bound_args(__bound_args...) { }
1185 template<typename... _Args>
1187 _Functor(typename result_of<_Mu<_Bound_args>
1188 (_Bound_args, tuple<_Args...>)>::type...)
1190 operator()(_Args&... __args)
1192 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1196 template<typename... _Args>
1198 const _Functor(typename result_of<_Mu<_Bound_args>
1199 (const _Bound_args, tuple<_Args...>)>::type...)
1201 operator()(_Args&... __args) const
1203 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1208 template<typename... _Args>
1210 volatile _Functor(typename result_of<_Mu<_Bound_args>
1211 (volatile _Bound_args, tuple<_Args...>)>::type...)
1213 operator()(_Args&... __args) volatile
1215 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1219 // Call as const volatile
1220 template<typename... _Args>
1222 const volatile _Functor(typename result_of<_Mu<_Bound_args>
1223 (const volatile _Bound_args,
1224 tuple<_Args...>)>::type...)
1226 operator()(_Args&... __args) const volatile
1228 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1232 /// Type of the function object returned from bind<R>().
1233 template<typename _Result, typename _Signature>
1234 struct _Bind_result;
1236 template<typename _Result, typename _Functor, typename... _Bound_args>
1237 class _Bind_result<_Result, _Functor(_Bound_args...)>
1239 typedef _Bind_result __self_type;
1240 typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type
1244 tuple<_Bound_args...> _M_bound_args;
1247 template<typename... _Args, int... _Indexes>
1249 __call(const tuple<_Args...>& __args, _Index_tuple<_Indexes...>)
1251 return _M_f(_Mu<_Bound_args>()
1252 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1256 template<typename... _Args, int... _Indexes>
1258 __call(const tuple<_Args...>& __args, _Index_tuple<_Indexes...>) const
1260 return _M_f(_Mu<_Bound_args>()
1261 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1265 template<typename... _Args, int... _Indexes>
1267 __call(const tuple<_Args...>& __args,
1268 _Index_tuple<_Indexes...>) volatile
1270 return _M_f(_Mu<_Bound_args>()
1271 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1274 // Call as const volatile
1275 template<typename... _Args, int... _Indexes>
1277 __call(const tuple<_Args...>& __args,
1278 _Index_tuple<_Indexes...>) const volatile
1280 return _M_f(_Mu<_Bound_args>()
1281 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1285 typedef _Result result_type;
1288 _Bind_result(_Functor __f, _Bound_args... __bound_args)
1289 : _M_f(__f), _M_bound_args(__bound_args...) { }
1292 template<typename... _Args>
1294 operator()(_Args&... __args)
1296 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1300 template<typename... _Args>
1302 operator()(_Args&... __args) const
1304 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1308 template<typename... _Args>
1310 operator()(_Args&... __args) volatile
1312 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1315 // Call as const volatile
1316 template<typename... _Args>
1318 operator()(_Args&... __args) const volatile
1320 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1324 /// Class template _Bind is always a bind expression.
1325 template<typename _Signature>
1326 struct is_bind_expression<_Bind<_Signature> >
1327 { static const bool value = true; };
1329 template<typename _Signature>
1330 const bool is_bind_expression<_Bind<_Signature> >::value;
1332 /// Class template _Bind_result is always a bind expression.
1333 template<typename _Result, typename _Signature>
1334 struct is_bind_expression<_Bind_result<_Result, _Signature> >
1335 { static const bool value = true; };
1337 template<typename _Result, typename _Signature>
1338 const bool is_bind_expression<_Bind_result<_Result, _Signature> >::value;
1341 template<typename _Functor, typename... _ArgTypes>
1343 _Bind<typename _Maybe_wrap_member_pointer<_Functor>::type(_ArgTypes...)>
1344 bind(_Functor __f, _ArgTypes... __args)
1346 typedef _Maybe_wrap_member_pointer<_Functor> __maybe_type;
1347 typedef typename __maybe_type::type __functor_type;
1348 typedef _Bind<__functor_type(_ArgTypes...)> __result_type;
1349 return __result_type(__maybe_type::__do_wrap(__f), __args...);
1352 template<typename _Result, typename _Functor, typename... _ArgTypes>
1354 _Bind_result<_Result,
1355 typename _Maybe_wrap_member_pointer<_Functor>::type
1357 bind(_Functor __f, _ArgTypes... __args)
1359 typedef _Maybe_wrap_member_pointer<_Functor> __maybe_type;
1360 typedef typename __maybe_type::type __functor_type;
1361 typedef _Bind_result<_Result, __functor_type(_ArgTypes...)>
1363 return __result_type(__maybe_type::__do_wrap(__f), __args...);
1367 * @brief Exception class thrown when class template function's
1368 * operator() is called with an empty target.
1371 class bad_function_call : public std::exception { };
1374 * The integral constant expression 0 can be converted into a
1375 * pointer to this type. It is used by the function template to
1376 * accept NULL pointers.
1378 struct _M_clear_type;
1381 * Trait identifying "location-invariant" types, meaning that the
1382 * address of the object (or any of its members) will not escape.
1383 * Also implies a trivial copy constructor and assignment operator.
1385 template<typename _Tp>
1386 struct __is_location_invariant
1387 : integral_constant<bool,
1388 (is_pointer<_Tp>::value
1389 || is_member_pointer<_Tp>::value)>
1393 class _Undefined_class;
1398 const void* _M_const_object;
1399 void (*_M_function_pointer)();
1400 void (_Undefined_class::*_M_member_pointer)();
1405 void* _M_access() { return &_M_pod_data[0]; }
1406 const void* _M_access() const { return &_M_pod_data[0]; }
1408 template<typename _Tp>
1411 { return *static_cast<_Tp*>(_M_access()); }
1413 template<typename _Tp>
1416 { return *static_cast<const _Tp*>(_M_access()); }
1418 _Nocopy_types _M_unused;
1419 char _M_pod_data[sizeof(_Nocopy_types)];
1422 enum _Manager_operation
1430 // Simple type wrapper that helps avoid annoying const problems
1431 // when casting between void pointers and pointers-to-pointers.
1432 template<typename _Tp>
1433 struct _Simple_type_wrapper
1435 _Simple_type_wrapper(_Tp __value) : __value(__value) { }
1440 template<typename _Tp>
1441 struct __is_location_invariant<_Simple_type_wrapper<_Tp> >
1442 : __is_location_invariant<_Tp>
1446 // Converts a reference to a function object into a callable
1448 template<typename _Functor>
1450 __callable_functor(_Functor& __f)
1453 template<typename _Member, typename _Class>
1454 inline _Mem_fn<_Member _Class::*>
1455 __callable_functor(_Member _Class::* &__p)
1456 { return mem_fn(__p); }
1458 template<typename _Member, typename _Class>
1459 inline _Mem_fn<_Member _Class::*>
1460 __callable_functor(_Member _Class::* const &__p)
1461 { return mem_fn(__p); }
1463 template<typename _Signature>
1466 /// Base class of all polymorphic function object wrappers.
1467 class _Function_base
1470 static const std::size_t _M_max_size = sizeof(_Nocopy_types);
1471 static const std::size_t _M_max_align = __alignof__(_Nocopy_types);
1473 template<typename _Functor>
1477 static const bool __stored_locally =
1478 (__is_location_invariant<_Functor>::value
1479 && sizeof(_Functor) <= _M_max_size
1480 && __alignof__(_Functor) <= _M_max_align
1481 && (_M_max_align % __alignof__(_Functor) == 0));
1483 typedef integral_constant<bool, __stored_locally> _Local_storage;
1485 // Retrieve a pointer to the function object
1487 _M_get_pointer(const _Any_data& __source)
1489 const _Functor* __ptr =
1490 __stored_locally? &__source._M_access<_Functor>()
1491 /* have stored a pointer */ : __source._M_access<_Functor*>();
1492 return const_cast<_Functor*>(__ptr);
1495 // Clone a location-invariant function object that fits within
1496 // an _Any_data structure.
1498 _M_clone(_Any_data& __dest, const _Any_data& __source, true_type)
1500 new (__dest._M_access()) _Functor(__source._M_access<_Functor>());
1503 // Clone a function object that is not location-invariant or
1504 // that cannot fit into an _Any_data structure.
1506 _M_clone(_Any_data& __dest, const _Any_data& __source, false_type)
1508 __dest._M_access<_Functor*>() =
1509 new _Functor(*__source._M_access<_Functor*>());
1512 // Destroying a location-invariant object may still require
1515 _M_destroy(_Any_data& __victim, true_type)
1517 __victim._M_access<_Functor>().~_Functor();
1520 // Destroying an object located on the heap.
1522 _M_destroy(_Any_data& __victim, false_type)
1524 delete __victim._M_access<_Functor*>();
1529 _M_manager(_Any_data& __dest, const _Any_data& __source,
1530 _Manager_operation __op)
1534 case __get_type_info:
1535 __dest._M_access<const type_info*>() = &typeid(_Functor);
1538 case __get_functor_ptr:
1539 __dest._M_access<_Functor*>() = _M_get_pointer(__source);
1542 case __clone_functor:
1543 _M_clone(__dest, __source, _Local_storage());
1546 case __destroy_functor:
1547 _M_destroy(__dest, _Local_storage());
1554 _M_init_functor(_Any_data& __functor, const _Functor& __f)
1555 { _M_init_functor(__functor, __f, _Local_storage()); }
1557 template<typename _Signature>
1559 _M_not_empty_function(const function<_Signature>& __f)
1562 template<typename _Tp>
1564 _M_not_empty_function(const _Tp*& __fp)
1567 template<typename _Class, typename _Tp>
1569 _M_not_empty_function(_Tp _Class::* const& __mp)
1572 template<typename _Tp>
1574 _M_not_empty_function(const _Tp&)
1579 _M_init_functor(_Any_data& __functor, const _Functor& __f, true_type)
1580 { new (__functor._M_access()) _Functor(__f); }
1583 _M_init_functor(_Any_data& __functor, const _Functor& __f, false_type)
1584 { __functor._M_access<_Functor*>() = new _Functor(__f); }
1587 template<typename _Functor>
1588 class _Ref_manager : public _Base_manager<_Functor*>
1590 typedef _Function_base::_Base_manager<_Functor*> _Base;
1594 _M_manager(_Any_data& __dest, const _Any_data& __source,
1595 _Manager_operation __op)
1599 case __get_type_info:
1600 __dest._M_access<const type_info*>() = &typeid(_Functor);
1603 case __get_functor_ptr:
1604 __dest._M_access<_Functor*>() = *_Base::_M_get_pointer(__source);
1605 return is_const<_Functor>::value;
1609 _Base::_M_manager(__dest, __source, __op);
1615 _M_init_functor(_Any_data& __functor, reference_wrapper<_Functor> __f)
1617 // TBD: Use address_of function instead.
1618 _Base::_M_init_functor(__functor, &__f.get());
1622 _Function_base() : _M_manager(0) { }
1627 _M_manager(_M_functor, _M_functor, __destroy_functor);
1631 bool _M_empty() const { return !_M_manager; }
1633 typedef bool (*_Manager_type)(_Any_data&, const _Any_data&,
1634 _Manager_operation);
1636 _Any_data _M_functor;
1637 _Manager_type _M_manager;
1640 template<typename _Signature, typename _Functor>
1641 class _Function_handler;
1643 template<typename _Res, typename _Functor, typename... _ArgTypes>
1644 class _Function_handler<_Res(_ArgTypes...), _Functor>
1645 : public _Function_base::_Base_manager<_Functor>
1647 typedef _Function_base::_Base_manager<_Functor> _Base;
1651 _M_invoke(const _Any_data& __functor, _ArgTypes... __args)
1653 return (*_Base::_M_get_pointer(__functor))(__args...);
1657 template<typename _Functor, typename... _ArgTypes>
1658 class _Function_handler<void(_ArgTypes...), _Functor>
1659 : public _Function_base::_Base_manager<_Functor>
1661 typedef _Function_base::_Base_manager<_Functor> _Base;
1665 _M_invoke(const _Any_data& __functor, _ArgTypes... __args)
1667 (*_Base::_M_get_pointer(__functor))(__args...);
1671 template<typename _Res, typename _Functor, typename... _ArgTypes>
1672 class _Function_handler<_Res(_ArgTypes...), reference_wrapper<_Functor> >
1673 : public _Function_base::_Ref_manager<_Functor>
1675 typedef _Function_base::_Ref_manager<_Functor> _Base;
1679 _M_invoke(const _Any_data& __functor, _ArgTypes... __args)
1682 __callable_functor(**_Base::_M_get_pointer(__functor))(__args...);
1686 template<typename _Functor, typename... _ArgTypes>
1687 class _Function_handler<void(_ArgTypes...), reference_wrapper<_Functor> >
1688 : public _Function_base::_Ref_manager<_Functor>
1690 typedef _Function_base::_Ref_manager<_Functor> _Base;
1694 _M_invoke(const _Any_data& __functor, _ArgTypes... __args)
1696 __callable_functor(**_Base::_M_get_pointer(__functor))(__args...);
1700 template<typename _Class, typename _Member, typename _Res,
1701 typename... _ArgTypes>
1702 class _Function_handler<_Res(_ArgTypes...), _Member _Class::*>
1703 : public _Function_handler<void(_ArgTypes...), _Member _Class::*>
1705 typedef _Function_handler<void(_ArgTypes...), _Member _Class::*>
1710 _M_invoke(const _Any_data& __functor, _ArgTypes... __args)
1713 mem_fn(_Base::_M_get_pointer(__functor)->__value)(__args...);
1717 template<typename _Class, typename _Member, typename... _ArgTypes>
1718 class _Function_handler<void(_ArgTypes...), _Member _Class::*>
1719 : public _Function_base::_Base_manager<
1720 _Simple_type_wrapper< _Member _Class::* > >
1722 typedef _Member _Class::* _Functor;
1723 typedef _Simple_type_wrapper<_Functor> _Wrapper;
1724 typedef _Function_base::_Base_manager<_Wrapper> _Base;
1728 _M_manager(_Any_data& __dest, const _Any_data& __source,
1729 _Manager_operation __op)
1733 case __get_type_info:
1734 __dest._M_access<const type_info*>() = &typeid(_Functor);
1737 case __get_functor_ptr:
1738 __dest._M_access<_Functor*>() =
1739 &_Base::_M_get_pointer(__source)->__value;
1743 _Base::_M_manager(__dest, __source, __op);
1749 _M_invoke(const _Any_data& __functor, _ArgTypes... __args)
1752 mem_fn(_Base::_M_get_pointer(__functor)->__value)(__args...);
1757 template<typename _Res, typename... _ArgTypes>
1758 class function<_Res(_ArgTypes...)>
1759 : public _Maybe_unary_or_binary_function<_Res, _ArgTypes...>,
1760 private _Function_base
1762 /// This class is used to implement the safe_bool idiom.
1765 _Hidden_type* _M_bool;
1768 /// This typedef is used to implement the safe_bool idiom.
1769 typedef _Hidden_type* _Hidden_type::* _Safe_bool;
1771 typedef _Res _Signature_type(_ArgTypes...);
1773 struct _Useless { };
1776 typedef _Res result_type;
1778 // [3.7.2.1] construct/copy/destroy
1781 * @brief Default construct creates an empty function call wrapper.
1782 * @post @c !(bool)*this
1784 function() : _Function_base() { }
1787 * @brief Default construct creates an empty function call wrapper.
1788 * @post @c !(bool)*this
1790 function(_M_clear_type*) : _Function_base() { }
1793 * @brief %Function copy constructor.
1794 * @param x A %function object with identical call signature.
1795 * @pre @c (bool)*this == (bool)x
1797 * The newly-created %function contains a copy of the target of @a
1798 * x (if it has one).
1800 function(const function& __x);
1803 * @brief Builds a %function that targets a copy of the incoming
1805 * @param f A %function object that is callable with parameters of
1806 * type @c T1, @c T2, ..., @c TN and returns a value convertible
1809 * The newly-created %function object will target a copy of @a
1810 * f. If @a f is @c reference_wrapper<F>, then this function
1811 * object will contain a reference to the function object @c
1812 * f.get(). If @a f is a NULL function pointer or NULL
1813 * pointer-to-member, the newly-created object will be empty.
1815 * If @a f is a non-NULL function pointer or an object of type @c
1816 * reference_wrapper<F>, this function will not throw.
1818 template<typename _Functor>
1819 function(_Functor __f,
1820 typename __gnu_cxx::__enable_if<
1821 !is_integral<_Functor>::value, _Useless>::__type
1825 * @brief %Function assignment operator.
1826 * @param x A %function with identical call signature.
1827 * @post @c (bool)*this == (bool)x
1830 * The target of @a x is copied to @c *this. If @a x has no
1831 * target, then @c *this will be empty.
1833 * If @a x targets a function pointer or a reference to a function
1834 * object, then this operation will not throw an exception.
1837 operator=(const function& __x)
1839 function(__x).swap(*this);
1844 * @brief %Function assignment to zero.
1845 * @post @c !(bool)*this
1848 * The target of @a *this is deallocated, leaving it empty.
1851 operator=(_M_clear_type*)
1855 _M_manager(_M_functor, _M_functor, __destroy_functor);
1863 * @brief %Function assignment to a new target.
1864 * @param f A %function object that is callable with parameters of
1865 * type @c T1, @c T2, ..., @c TN and returns a value convertible
1869 * This %function object wrapper will target a copy of @a
1870 * f. If @a f is @c reference_wrapper<F>, then this function
1871 * object will contain a reference to the function object @c
1872 * f.get(). If @a f is a NULL function pointer or NULL
1873 * pointer-to-member, @c this object will be empty.
1875 * If @a f is a non-NULL function pointer or an object of type @c
1876 * reference_wrapper<F>, this function will not throw.
1878 template<typename _Functor>
1879 typename __gnu_cxx::__enable_if<!is_integral<_Functor>::value,
1881 operator=(_Functor __f)
1883 function(__f).swap(*this);
1887 // [3.7.2.2] function modifiers
1890 * @brief Swap the targets of two %function objects.
1891 * @param f A %function with identical call signature.
1893 * Swap the targets of @c this function object and @a f. This
1894 * function will not throw an exception.
1896 void swap(function& __x)
1898 _Any_data __old_functor = _M_functor;
1899 _M_functor = __x._M_functor;
1900 __x._M_functor = __old_functor;
1901 _Manager_type __old_manager = _M_manager;
1902 _M_manager = __x._M_manager;
1903 __x._M_manager = __old_manager;
1904 _Invoker_type __old_invoker = _M_invoker;
1905 _M_invoker = __x._M_invoker;
1906 __x._M_invoker = __old_invoker;
1909 // [3.7.2.3] function capacity
1912 * @brief Determine if the %function wrapper has a target.
1914 * @return @c true when this %function object contains a target,
1915 * or @c false when it is empty.
1917 * This function will not throw an exception.
1919 operator _Safe_bool() const
1924 return &_Hidden_type::_M_bool;
1927 // [3.7.2.4] function invocation
1930 * @brief Invokes the function targeted by @c *this.
1931 * @returns the result of the target.
1932 * @throws bad_function_call when @c !(bool)*this
1934 * The function call operator invokes the target function object
1935 * stored by @c this.
1937 _Res operator()(_ArgTypes... __args) const;
1939 // [3.7.2.5] function target access
1941 * @brief Determine the type of the target of this function object
1944 * @returns the type identifier of the target function object, or
1945 * @c typeid(void) if @c !(bool)*this.
1947 * This function will not throw an exception.
1949 const type_info& target_type() const;
1952 * @brief Access the stored target function object.
1954 * @return Returns a pointer to the stored target function object,
1955 * if @c typeid(Functor).equals(target_type()); otherwise, a NULL
1958 * This function will not throw an exception.
1960 template<typename _Functor> _Functor* target();
1963 template<typename _Functor> const _Functor* target() const;
1966 // [3.7.2.6] undefined operators
1967 template<typename _Function>
1968 void operator==(const function<_Function>&) const;
1969 template<typename _Function>
1970 void operator!=(const function<_Function>&) const;
1972 typedef _Res (*_Invoker_type)(const _Any_data&, _ArgTypes...);
1973 _Invoker_type _M_invoker;
1976 template<typename _Res, typename... _ArgTypes>
1977 function<_Res(_ArgTypes...)>::
1978 function(const function& __x)
1983 _M_invoker = __x._M_invoker;
1984 _M_manager = __x._M_manager;
1985 __x._M_manager(_M_functor, __x._M_functor, __clone_functor);
1989 template<typename _Res, typename... _ArgTypes>
1990 template<typename _Functor>
1991 function<_Res(_ArgTypes...)>::
1992 function(_Functor __f,
1993 typename __gnu_cxx::__enable_if<
1994 !is_integral<_Functor>::value, _Useless>::__type)
1997 typedef _Function_handler<_Signature_type, _Functor> _My_handler;
1999 if (_My_handler::_M_not_empty_function(__f))
2001 _M_invoker = &_My_handler::_M_invoke;
2002 _M_manager = &_My_handler::_M_manager;
2003 _My_handler::_M_init_functor(_M_functor, __f);
2007 template<typename _Res, typename... _ArgTypes>
2009 function<_Res(_ArgTypes...)>::
2010 operator()(_ArgTypes... __args) const
2015 throw bad_function_call();
2020 return _M_invoker(_M_functor, __args...);
2023 template<typename _Res, typename... _ArgTypes>
2025 function<_Res(_ArgTypes...)>::
2030 _Any_data __typeinfo_result;
2031 _M_manager(__typeinfo_result, _M_functor, __get_type_info);
2032 return *__typeinfo_result._M_access<const type_info*>();
2035 return typeid(void);
2038 template<typename _Res, typename... _ArgTypes>
2039 template<typename _Functor>
2041 function<_Res(_ArgTypes...)>::
2044 if (typeid(_Functor) == target_type() && _M_manager)
2047 if (_M_manager(__ptr, _M_functor, __get_functor_ptr)
2048 && !is_const<_Functor>::value)
2051 return __ptr._M_access<_Functor*>();
2057 template<typename _Res, typename... _ArgTypes>
2058 template<typename _Functor>
2060 function<_Res(_ArgTypes...)>::
2063 if (typeid(_Functor) == target_type() && _M_manager)
2066 _M_manager(__ptr, _M_functor, __get_functor_ptr);
2067 return __ptr._M_access<const _Functor*>();
2073 // [3.7.2.7] null pointer comparisons
2076 * @brief Compares a polymorphic function object wrapper against 0
2077 * (the NULL pointer).
2078 * @returns @c true if the wrapper has no target, @c false otherwise
2080 * This function will not throw an exception.
2082 template<typename _Signature>
2084 operator==(const function<_Signature>& __f, _M_clear_type*)
2088 template<typename _Signature>
2090 operator==(_M_clear_type*, const function<_Signature>& __f)
2094 * @brief Compares a polymorphic function object wrapper against 0
2095 * (the NULL pointer).
2096 * @returns @c false if the wrapper has no target, @c true otherwise
2098 * This function will not throw an exception.
2100 template<typename _Signature>
2102 operator!=(const function<_Signature>& __f, _M_clear_type*)
2106 template<typename _Signature>
2108 operator!=(_M_clear_type*, const function<_Signature>& __f)
2111 // [3.7.2.8] specialized algorithms
2114 * @brief Swap the targets of two polymorphic function object wrappers.
2116 * This function will not throw an exception.
2118 template<typename _Signature>
2120 swap(function<_Signature>& __x, function<_Signature>& __y)
2123 _GLIBCXX_END_NAMESPACE_TR1