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 template<typename _Tp>
430 class reference_wrapper
431 : public _Reference_wrapper_base<typename remove_cv<_Tp>::type>
433 // If _Tp is a function type, we can't form result_of<_Tp(...)>,
434 // so turn it into a function pointer type.
435 typedef typename _Function_to_function_pointer<_Tp>::type
443 reference_wrapper(_Tp& __indata): _M_data(&__indata)
446 reference_wrapper(const reference_wrapper<_Tp>& __inref):
447 _M_data(__inref._M_data)
451 operator=(const reference_wrapper<_Tp>& __inref)
453 _M_data = __inref._M_data;
457 operator _Tp&() const
458 { return this->get(); }
464 template<typename... _Args>
465 typename result_of<_M_func_type(_Args...)>::type
466 operator()(_Args&... __args) const
468 return __invoke(get(), __args...);
473 // Denotes a reference should be taken to a variable.
474 template<typename _Tp>
475 inline reference_wrapper<_Tp>
477 { return reference_wrapper<_Tp>(__t); }
479 // Denotes a const reference should be taken to a variable.
480 template<typename _Tp>
481 inline reference_wrapper<const _Tp>
483 { return reference_wrapper<const _Tp>(__t); }
485 template<typename _Tp>
486 inline reference_wrapper<_Tp>
487 ref(reference_wrapper<_Tp> __t)
488 { return ref(__t.get()); }
490 template<typename _Tp>
491 inline reference_wrapper<const _Tp>
492 cref(reference_wrapper<_Tp> __t)
493 { return cref(__t.get()); }
495 template<typename _Tp, bool>
496 struct _Mem_fn_const_or_non
498 typedef const _Tp& type;
501 template<typename _Tp>
502 struct _Mem_fn_const_or_non<_Tp, false>
508 * Derives from @c unary_function or @c binary_function, or perhaps
509 * nothing, depending on the number of arguments provided. The
510 * primary template is the basis case, which derives nothing.
512 template<typename _Res, typename... _ArgTypes>
513 struct _Maybe_unary_or_binary_function { };
515 /// Derives from @c unary_function, as appropriate.
516 template<typename _Res, typename _T1>
517 struct _Maybe_unary_or_binary_function<_Res, _T1>
518 : std::unary_function<_T1, _Res> { };
520 /// Derives from @c binary_function, as appropriate.
521 template<typename _Res, typename _T1, typename _T2>
522 struct _Maybe_unary_or_binary_function<_Res, _T1, _T2>
523 : std::binary_function<_T1, _T2, _Res> { };
525 /// Implementation of @c mem_fn for member function pointers.
526 template<typename _Res, typename _Class, typename... _ArgTypes>
527 class _Mem_fn<_Res (_Class::*)(_ArgTypes...)>
528 : public _Maybe_unary_or_binary_function<_Res, _Class*, _ArgTypes...>
530 typedef _Res (_Class::*_Functor)(_ArgTypes...);
532 template<typename _Tp>
534 _M_call(_Tp& __object, const volatile _Class *,
535 _ArgTypes... __args) const
536 { return (__object.*__pmf)(__args...); }
538 template<typename _Tp>
540 _M_call(_Tp& __ptr, const volatile void *, _ArgTypes... __args) const
541 { return ((*__ptr).*__pmf)(__args...); }
544 typedef _Res result_type;
546 explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
550 operator()(_Class& __object, _ArgTypes... __args) const
551 { return (__object.*__pmf)(__args...); }
555 operator()(_Class* __object, _ArgTypes... __args) const
556 { return (__object->*__pmf)(__args...); }
558 // Handle smart pointers, references and pointers to derived
559 template<typename _Tp>
561 operator()(_Tp& __object, _ArgTypes... __args) const
562 { return _M_call(__object, &__object, __args...); }
568 /// Implementation of @c mem_fn for const member function pointers.
569 template<typename _Res, typename _Class, typename... _ArgTypes>
570 class _Mem_fn<_Res (_Class::*)(_ArgTypes...) const>
571 : public _Maybe_unary_or_binary_function<_Res, const _Class*,
574 typedef _Res (_Class::*_Functor)(_ArgTypes...) const;
576 template<typename _Tp>
578 _M_call(_Tp& __object, const volatile _Class *,
579 _ArgTypes... __args) const
580 { return (__object.*__pmf)(__args...); }
582 template<typename _Tp>
584 _M_call(_Tp& __ptr, const volatile void *, _ArgTypes... __args) const
585 { return ((*__ptr).*__pmf)(__args...); }
588 typedef _Res result_type;
590 explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
594 operator()(const _Class& __object, _ArgTypes... __args) const
595 { return (__object.*__pmf)(__args...); }
599 operator()(const _Class* __object, _ArgTypes... __args) const
600 { return (__object->*__pmf)(__args...); }
602 // Handle smart pointers, references and pointers to derived
603 template<typename _Tp>
604 _Res operator()(_Tp& __object, _ArgTypes... __args) const
605 { return _M_call(__object, &__object, __args...); }
611 /// Implementation of @c mem_fn for volatile member function pointers.
612 template<typename _Res, typename _Class, typename... _ArgTypes>
613 class _Mem_fn<_Res (_Class::*)(_ArgTypes...) volatile>
614 : public _Maybe_unary_or_binary_function<_Res, volatile _Class*,
617 typedef _Res (_Class::*_Functor)(_ArgTypes...) volatile;
619 template<typename _Tp>
621 _M_call(_Tp& __object, const volatile _Class *,
622 _ArgTypes... __args) const
623 { return (__object.*__pmf)(__args...); }
625 template<typename _Tp>
627 _M_call(_Tp& __ptr, const volatile void *, _ArgTypes... __args) const
628 { return ((*__ptr).*__pmf)(__args...); }
631 typedef _Res result_type;
633 explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
637 operator()(volatile _Class& __object, _ArgTypes... __args) const
638 { return (__object.*__pmf)(__args...); }
642 operator()(volatile _Class* __object, _ArgTypes... __args) const
643 { return (__object->*__pmf)(__args...); }
645 // Handle smart pointers, references and pointers to derived
646 template<typename _Tp>
648 operator()(_Tp& __object, _ArgTypes... __args) const
649 { return _M_call(__object, &__object, __args...); }
655 /// Implementation of @c mem_fn for const volatile member function pointers.
656 template<typename _Res, typename _Class, typename... _ArgTypes>
657 class _Mem_fn<_Res (_Class::*)(_ArgTypes...) const volatile>
658 : public _Maybe_unary_or_binary_function<_Res, const volatile _Class*,
661 typedef _Res (_Class::*_Functor)(_ArgTypes...) const volatile;
663 template<typename _Tp>
665 _M_call(_Tp& __object, const volatile _Class *,
666 _ArgTypes... __args) const
667 { return (__object.*__pmf)(__args...); }
669 template<typename _Tp>
671 _M_call(_Tp& __ptr, const volatile void *, _ArgTypes... __args) const
672 { return ((*__ptr).*__pmf)(__args...); }
675 typedef _Res result_type;
677 explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
681 operator()(const volatile _Class& __object, _ArgTypes... __args) const
682 { return (__object.*__pmf)(__args...); }
686 operator()(const volatile _Class* __object, _ArgTypes... __args) const
687 { return (__object->*__pmf)(__args...); }
689 // Handle smart pointers, references and pointers to derived
690 template<typename _Tp>
691 _Res operator()(_Tp& __object, _ArgTypes... __args) const
692 { return _M_call(__object, &__object, __args...); }
699 template<typename _Res, typename _Class>
700 class _Mem_fn<_Res _Class::*>
702 // This bit of genius is due to Peter Dimov, improved slightly by
704 template<typename _Tp>
706 _M_call(_Tp& __object, _Class *) const
707 { return __object.*__pm; }
709 template<typename _Tp, typename _Up>
711 _M_call(_Tp& __object, _Up * const *) const
712 { return (*__object).*__pm; }
714 template<typename _Tp, typename _Up>
716 _M_call(_Tp& __object, const _Up * const *) const
717 { return (*__object).*__pm; }
719 template<typename _Tp>
721 _M_call(_Tp& __object, const _Class *) const
722 { return __object.*__pm; }
724 template<typename _Tp>
726 _M_call(_Tp& __ptr, const volatile void*) const
727 { return (*__ptr).*__pm; }
729 template<typename _Tp> static _Tp& __get_ref();
731 template<typename _Tp>
732 static __sfinae_types::__one __check_const(_Tp&, _Class*);
733 template<typename _Tp, typename _Up>
734 static __sfinae_types::__one __check_const(_Tp&, _Up * const *);
735 template<typename _Tp, typename _Up>
736 static __sfinae_types::__two __check_const(_Tp&, const _Up * const *);
737 template<typename _Tp>
738 static __sfinae_types::__two __check_const(_Tp&, const _Class*);
739 template<typename _Tp>
740 static __sfinae_types::__two __check_const(_Tp&, const volatile void*);
743 template<typename _Tp>
745 : _Mem_fn_const_or_non<_Res,
746 (sizeof(__sfinae_types::__two)
747 == sizeof(__check_const<_Tp>(__get_ref<_Tp>(), (_Tp*)0)))>
750 template<typename _Signature>
753 template<typename _CVMem, typename _Tp>
754 struct result<_CVMem(_Tp)>
755 : public _Result_type<_Tp> { };
757 template<typename _CVMem, typename _Tp>
758 struct result<_CVMem(_Tp&)>
759 : public _Result_type<_Tp> { };
762 _Mem_fn(_Res _Class::*__pm) : __pm(__pm) { }
766 operator()(_Class& __object) const
767 { return __object.*__pm; }
770 operator()(const _Class& __object) const
771 { return __object.*__pm; }
775 operator()(_Class* __object) const
776 { return __object->*__pm; }
779 operator()(const _Class* __object) const
780 { return __object->*__pm; }
782 // Handle smart pointers and derived
783 template<typename _Tp>
784 typename _Result_type<_Tp>::type
785 operator()(_Tp& __unknown) const
786 { return _M_call(__unknown, &__unknown); }
793 * @brief Returns a function object that forwards to the member
796 template<typename _Tp, typename _Class>
797 inline _Mem_fn<_Tp _Class::*>
798 mem_fn(_Tp _Class::* __pm)
800 return _Mem_fn<_Tp _Class::*>(__pm);
804 * @brief Determines if the given type _Tp is a function object
805 * should be treated as a subexpression when evaluating calls to
806 * function objects returned by bind(). [TR1 3.6.1]
808 template<typename _Tp>
809 struct is_bind_expression
810 { static const bool value = false; };
812 template<typename _Tp>
813 const bool is_bind_expression<_Tp>::value;
816 * @brief Determines if the given type _Tp is a placeholder in a
817 * bind() expression and, if so, which placeholder it is. [TR1 3.6.2]
819 template<typename _Tp>
820 struct is_placeholder
821 { static const int value = 0; };
823 template<typename _Tp>
824 const int is_placeholder<_Tp>::value;
826 /// The type of placeholder objects defined by libstdc++.
827 template<int _Num> struct _Placeholder { };
829 // Define a large number of placeholders. There is no way to
830 // simplify this with variadic templates, because we're introducing
831 // unique names for each.
832 namespace placeholders
845 _Placeholder<10> _10;
846 _Placeholder<11> _11;
847 _Placeholder<12> _12;
848 _Placeholder<13> _13;
849 _Placeholder<14> _14;
850 _Placeholder<15> _15;
851 _Placeholder<16> _16;
852 _Placeholder<17> _17;
853 _Placeholder<18> _18;
854 _Placeholder<19> _19;
855 _Placeholder<20> _20;
856 _Placeholder<21> _21;
857 _Placeholder<22> _22;
858 _Placeholder<23> _23;
859 _Placeholder<24> _24;
860 _Placeholder<25> _25;
861 _Placeholder<26> _26;
862 _Placeholder<27> _27;
863 _Placeholder<28> _28;
864 _Placeholder<29> _29;
869 * Partial specialization of is_placeholder that provides the placeholder
870 * number for the placeholder objects defined by libstdc++.
873 struct is_placeholder<_Placeholder<_Num> >
874 { static const int value = _Num; };
877 const int is_placeholder<_Placeholder<_Num> >::value;
880 * Stores a tuple of indices. Used by bind() to extract the elements
883 template<int... _Indexes>
884 struct _Index_tuple { };
886 /// Builds an _Index_tuple<0, 1, 2, ..., _Num-1>.
887 template<std::size_t _Num, typename _Tuple = _Index_tuple<> >
888 struct _Build_index_tuple;
890 template<std::size_t _Num, int... _Indexes>
891 struct _Build_index_tuple<_Num, _Index_tuple<_Indexes...> >
892 : _Build_index_tuple<_Num - 1,
893 _Index_tuple<_Indexes..., sizeof...(_Indexes)> >
897 template<int... _Indexes>
898 struct _Build_index_tuple<0, _Index_tuple<_Indexes...> >
900 typedef _Index_tuple<_Indexes...> __type;
904 * Used by _Safe_tuple_element to indicate that there is no tuple
905 * element at this position.
907 struct _No_tuple_element;
910 * Implementation helper for _Safe_tuple_element. This primary
911 * template handles the case where it is safe to use @c
914 template<int __i, typename _Tuple, bool _IsSafe>
915 struct _Safe_tuple_element_impl
916 : tuple_element<__i, _Tuple> { };
919 * Implementation helper for _Safe_tuple_element. This partial
920 * specialization handles the case where it is not safe to use @c
921 * tuple_element. We just return @c _No_tuple_element.
923 template<int __i, typename _Tuple>
924 struct _Safe_tuple_element_impl<__i, _Tuple, false>
926 typedef _No_tuple_element type;
930 * Like tuple_element, but returns @c _No_tuple_element when
931 * tuple_element would return an error.
933 template<int __i, typename _Tuple>
934 struct _Safe_tuple_element
935 : _Safe_tuple_element_impl<__i, _Tuple,
936 (__i >= 0 && __i < tuple_size<_Tuple>::value)>
941 * Maps an argument to bind() into an actual argument to the bound
942 * function object [TR1 3.6.3/5]. Only the first parameter should
943 * be specified: the rest are used to determine among the various
944 * implementations. Note that, although this class is a function
945 * object, isn't not entirely normal because it takes only two
946 * parameters regardless of the number of parameters passed to the
947 * bind expression. The first parameter is the bound argument and
948 * the second parameter is a tuple containing references to the
949 * rest of the arguments.
951 template<typename _Arg,
952 bool _IsBindExp = is_bind_expression<_Arg>::value,
953 bool _IsPlaceholder = (is_placeholder<_Arg>::value > 0)>
957 * If the argument is reference_wrapper<_Tp>, returns the
958 * underlying reference. [TR1 3.6.3/5 bullet 1]
960 template<typename _Tp>
961 class _Mu<reference_wrapper<_Tp>, false, false>
964 typedef _Tp& result_type;
966 /* Note: This won't actually work for const volatile
967 * reference_wrappers, because reference_wrapper::get() is const
968 * but not volatile-qualified. This might be a defect in the TR.
970 template<typename _CVRef, typename _Tuple>
972 operator()(_CVRef& __arg, const _Tuple&) const volatile
973 { return __arg.get(); }
977 * If the argument is a bind expression, we invoke the underlying
978 * function object with the same cv-qualifiers as we are given and
979 * pass along all of our arguments (unwrapped). [TR1 3.6.3/5 bullet 2]
981 template<typename _Arg>
982 class _Mu<_Arg, true, false>
985 template<typename _Signature> class result;
987 // Determine the result type when we pass the arguments along. This
988 // involves passing along the cv-qualifiers placed on _Mu and
989 // unwrapping the argument bundle.
990 template<typename _CVMu, typename _CVArg, typename... _Args>
991 class result<_CVMu(_CVArg, tuple<_Args...>)>
992 : public result_of<_CVArg(_Args...)> { };
994 template<typename _CVArg, typename... _Args>
995 typename result_of<_CVArg(_Args...)>::type
996 operator()(_CVArg& __arg,
997 const tuple<_Args...>& __tuple) const volatile
999 // Construct an index tuple and forward to __call
1000 typedef typename _Build_index_tuple<sizeof...(_Args)>::__type
1002 return this->__call(__arg, __tuple, _Indexes());
1006 // Invokes the underlying function object __arg by unpacking all
1007 // of the arguments in the tuple.
1008 template<typename _CVArg, typename... _Args, int... _Indexes>
1009 typename result_of<_CVArg(_Args...)>::type
1010 __call(_CVArg& __arg, const tuple<_Args...>& __tuple,
1011 const _Index_tuple<_Indexes...>&) const volatile
1013 return __arg(_GLIBCXX_TR1 get<_Indexes>(__tuple)...);
1018 * If the argument is a placeholder for the Nth argument, returns
1019 * a reference to the Nth argument to the bind function object.
1020 * [TR1 3.6.3/5 bullet 3]
1022 template<typename _Arg>
1023 class _Mu<_Arg, false, true>
1026 template<typename _Signature> class result;
1028 template<typename _CVMu, typename _CVArg, typename _Tuple>
1029 class result<_CVMu(_CVArg, _Tuple)>
1031 // Add a reference, if it hasn't already been done for us.
1032 // This allows us to be a little bit sloppy in constructing
1033 // the tuple that we pass to result_of<...>.
1034 typedef typename _Safe_tuple_element<(is_placeholder<_Arg>::value
1039 #ifdef _GLIBCXX_INCLUDE_AS_CXX0X
1040 typedef typename add_lvalue_reference<__base_type>::type type;
1042 typedef typename add_reference<__base_type>::type type;
1046 template<typename _Tuple>
1047 typename result<_Mu(_Arg, _Tuple)>::type
1048 operator()(const volatile _Arg&, const _Tuple& __tuple) const volatile
1050 return ::std::_GLIBCXX_TR1 get<(is_placeholder<_Arg>::value
1056 * If the argument is just a value, returns a reference to that
1057 * value. The cv-qualifiers on the reference are the same as the
1058 * cv-qualifiers on the _Mu object. [TR1 3.6.3/5 bullet 4]
1060 template<typename _Arg>
1061 class _Mu<_Arg, false, false>
1064 template<typename _Signature> struct result;
1066 template<typename _CVMu, typename _CVArg, typename _Tuple>
1067 struct result<_CVMu(_CVArg, _Tuple)>
1069 #ifdef _GLIBCXX_INCLUDE_AS_CXX0X
1070 typedef typename add_lvalue_reference<_CVArg>::type type;
1072 typedef typename add_reference<_CVArg>::type type;
1076 // Pick up the cv-qualifiers of the argument
1077 template<typename _CVArg, typename _Tuple>
1079 operator()(_CVArg& __arg, const _Tuple&) const volatile
1084 * Maps member pointers into instances of _Mem_fn but leaves all
1085 * other function objects untouched. Used by tr1::bind(). The
1086 * primary template handles the non--member-pointer case.
1088 template<typename _Tp>
1089 struct _Maybe_wrap_member_pointer
1094 __do_wrap(const _Tp& __x)
1099 * Maps member pointers into instances of _Mem_fn but leaves all
1100 * other function objects untouched. Used by tr1::bind(). This
1101 * partial specialization handles the member pointer case.
1103 template<typename _Tp, typename _Class>
1104 struct _Maybe_wrap_member_pointer<_Tp _Class::*>
1106 typedef _Mem_fn<_Tp _Class::*> type;
1109 __do_wrap(_Tp _Class::* __pm)
1110 { return type(__pm); }
1113 /// Type of the function object returned from bind().
1114 template<typename _Signature>
1117 template<typename _Functor, typename... _Bound_args>
1118 class _Bind<_Functor(_Bound_args...)>
1119 : public _Weak_result_type<_Functor>
1121 typedef _Bind __self_type;
1122 typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type
1126 tuple<_Bound_args...> _M_bound_args;
1129 template<typename... _Args, int... _Indexes>
1131 _Functor(typename result_of<_Mu<_Bound_args>
1132 (_Bound_args, tuple<_Args...>)>::type...)
1134 __call(const tuple<_Args...>& __args, _Index_tuple<_Indexes...>)
1136 return _M_f(_Mu<_Bound_args>()
1137 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1141 template<typename... _Args, int... _Indexes>
1143 const _Functor(typename result_of<_Mu<_Bound_args>
1144 (const _Bound_args, tuple<_Args...>)
1146 __call(const tuple<_Args...>& __args, _Index_tuple<_Indexes...>) const
1148 return _M_f(_Mu<_Bound_args>()
1149 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1153 template<typename... _Args, int... _Indexes>
1155 volatile _Functor(typename result_of<_Mu<_Bound_args>
1156 (volatile _Bound_args, tuple<_Args...>)
1158 __call(const tuple<_Args...>& __args,
1159 _Index_tuple<_Indexes...>) volatile
1161 return _M_f(_Mu<_Bound_args>()
1162 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1165 // Call as const volatile
1166 template<typename... _Args, int... _Indexes>
1168 const volatile _Functor(typename result_of<_Mu<_Bound_args>
1169 (const volatile _Bound_args,
1172 __call(const tuple<_Args...>& __args,
1173 _Index_tuple<_Indexes...>) const volatile
1175 return _M_f(_Mu<_Bound_args>()
1176 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1180 explicit _Bind(_Functor __f, _Bound_args... __bound_args)
1181 : _M_f(__f), _M_bound_args(__bound_args...) { }
1184 template<typename... _Args>
1186 _Functor(typename result_of<_Mu<_Bound_args>
1187 (_Bound_args, tuple<_Args...>)>::type...)
1189 operator()(_Args&... __args)
1191 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1195 template<typename... _Args>
1197 const _Functor(typename result_of<_Mu<_Bound_args>
1198 (const _Bound_args, tuple<_Args...>)>::type...)
1200 operator()(_Args&... __args) const
1202 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1207 template<typename... _Args>
1209 volatile _Functor(typename result_of<_Mu<_Bound_args>
1210 (volatile _Bound_args, tuple<_Args...>)>::type...)
1212 operator()(_Args&... __args) volatile
1214 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1218 // Call as const volatile
1219 template<typename... _Args>
1221 const volatile _Functor(typename result_of<_Mu<_Bound_args>
1222 (const volatile _Bound_args,
1223 tuple<_Args...>)>::type...)
1225 operator()(_Args&... __args) const volatile
1227 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1231 /// Type of the function object returned from bind<R>().
1232 template<typename _Result, typename _Signature>
1233 struct _Bind_result;
1235 template<typename _Result, typename _Functor, typename... _Bound_args>
1236 class _Bind_result<_Result, _Functor(_Bound_args...)>
1238 typedef _Bind_result __self_type;
1239 typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type
1243 tuple<_Bound_args...> _M_bound_args;
1246 template<typename... _Args, int... _Indexes>
1248 __call(const tuple<_Args...>& __args, _Index_tuple<_Indexes...>)
1250 return _M_f(_Mu<_Bound_args>()
1251 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1255 template<typename... _Args, int... _Indexes>
1257 __call(const tuple<_Args...>& __args, _Index_tuple<_Indexes...>) const
1259 return _M_f(_Mu<_Bound_args>()
1260 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1264 template<typename... _Args, int... _Indexes>
1266 __call(const tuple<_Args...>& __args,
1267 _Index_tuple<_Indexes...>) volatile
1269 return _M_f(_Mu<_Bound_args>()
1270 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1273 // Call as const volatile
1274 template<typename... _Args, int... _Indexes>
1276 __call(const tuple<_Args...>& __args,
1277 _Index_tuple<_Indexes...>) const volatile
1279 return _M_f(_Mu<_Bound_args>()
1280 (_GLIBCXX_TR1 get<_Indexes>(_M_bound_args), __args)...);
1284 typedef _Result result_type;
1287 _Bind_result(_Functor __f, _Bound_args... __bound_args)
1288 : _M_f(__f), _M_bound_args(__bound_args...) { }
1291 template<typename... _Args>
1293 operator()(_Args&... __args)
1295 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1299 template<typename... _Args>
1301 operator()(_Args&... __args) const
1303 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1307 template<typename... _Args>
1309 operator()(_Args&... __args) volatile
1311 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1314 // Call as const volatile
1315 template<typename... _Args>
1317 operator()(_Args&... __args) const volatile
1319 return this->__call(_GLIBCXX_TR1 tie(__args...), _Bound_indexes());
1323 /// Class template _Bind is always a bind expression.
1324 template<typename _Signature>
1325 struct is_bind_expression<_Bind<_Signature> >
1326 { static const bool value = true; };
1328 template<typename _Signature>
1329 const bool is_bind_expression<_Bind<_Signature> >::value;
1331 /// Class template _Bind_result is always a bind expression.
1332 template<typename _Result, typename _Signature>
1333 struct is_bind_expression<_Bind_result<_Result, _Signature> >
1334 { static const bool value = true; };
1336 template<typename _Result, typename _Signature>
1337 const bool is_bind_expression<_Bind_result<_Result, _Signature> >::value;
1339 template<typename _Functor, typename... _ArgTypes>
1341 _Bind<typename _Maybe_wrap_member_pointer<_Functor>::type(_ArgTypes...)>
1342 bind(_Functor __f, _ArgTypes... __args)
1344 typedef _Maybe_wrap_member_pointer<_Functor> __maybe_type;
1345 typedef typename __maybe_type::type __functor_type;
1346 typedef _Bind<__functor_type(_ArgTypes...)> __result_type;
1347 return __result_type(__maybe_type::__do_wrap(__f), __args...);
1350 template<typename _Result, typename _Functor, typename... _ArgTypes>
1352 _Bind_result<_Result,
1353 typename _Maybe_wrap_member_pointer<_Functor>::type
1355 bind(_Functor __f, _ArgTypes... __args)
1357 typedef _Maybe_wrap_member_pointer<_Functor> __maybe_type;
1358 typedef typename __maybe_type::type __functor_type;
1359 typedef _Bind_result<_Result, __functor_type(_ArgTypes...)>
1361 return __result_type(__maybe_type::__do_wrap(__f), __args...);
1365 * @brief Exception class thrown when class template function's
1366 * operator() is called with an empty target.
1369 class bad_function_call : public std::exception { };
1372 * The integral constant expression 0 can be converted into a
1373 * pointer to this type. It is used by the function template to
1374 * accept NULL pointers.
1376 struct _M_clear_type;
1379 * Trait identifying "location-invariant" types, meaning that the
1380 * address of the object (or any of its members) will not escape.
1381 * Also implies a trivial copy constructor and assignment operator.
1383 template<typename _Tp>
1384 struct __is_location_invariant
1385 : integral_constant<bool,
1386 (is_pointer<_Tp>::value
1387 || is_member_pointer<_Tp>::value)>
1391 class _Undefined_class;
1396 const void* _M_const_object;
1397 void (*_M_function_pointer)();
1398 void (_Undefined_class::*_M_member_pointer)();
1403 void* _M_access() { return &_M_pod_data[0]; }
1404 const void* _M_access() const { return &_M_pod_data[0]; }
1406 template<typename _Tp>
1409 { return *static_cast<_Tp*>(_M_access()); }
1411 template<typename _Tp>
1414 { return *static_cast<const _Tp*>(_M_access()); }
1416 _Nocopy_types _M_unused;
1417 char _M_pod_data[sizeof(_Nocopy_types)];
1420 enum _Manager_operation
1428 // Simple type wrapper that helps avoid annoying const problems
1429 // when casting between void pointers and pointers-to-pointers.
1430 template<typename _Tp>
1431 struct _Simple_type_wrapper
1433 _Simple_type_wrapper(_Tp __value) : __value(__value) { }
1438 template<typename _Tp>
1439 struct __is_location_invariant<_Simple_type_wrapper<_Tp> >
1440 : __is_location_invariant<_Tp>
1444 // Converts a reference to a function object into a callable
1446 template<typename _Functor>
1448 __callable_functor(_Functor& __f)
1451 template<typename _Member, typename _Class>
1452 inline _Mem_fn<_Member _Class::*>
1453 __callable_functor(_Member _Class::* &__p)
1454 { return mem_fn(__p); }
1456 template<typename _Member, typename _Class>
1457 inline _Mem_fn<_Member _Class::*>
1458 __callable_functor(_Member _Class::* const &__p)
1459 { return mem_fn(__p); }
1461 template<typename _Signature>
1464 /// Base class of all polymorphic function object wrappers.
1465 class _Function_base
1468 static const std::size_t _M_max_size = sizeof(_Nocopy_types);
1469 static const std::size_t _M_max_align = __alignof__(_Nocopy_types);
1471 template<typename _Functor>
1475 static const bool __stored_locally =
1476 (__is_location_invariant<_Functor>::value
1477 && sizeof(_Functor) <= _M_max_size
1478 && __alignof__(_Functor) <= _M_max_align
1479 && (_M_max_align % __alignof__(_Functor) == 0));
1481 typedef integral_constant<bool, __stored_locally> _Local_storage;
1483 // Retrieve a pointer to the function object
1485 _M_get_pointer(const _Any_data& __source)
1487 const _Functor* __ptr =
1488 __stored_locally? &__source._M_access<_Functor>()
1489 /* have stored a pointer */ : __source._M_access<_Functor*>();
1490 return const_cast<_Functor*>(__ptr);
1493 // Clone a location-invariant function object that fits within
1494 // an _Any_data structure.
1496 _M_clone(_Any_data& __dest, const _Any_data& __source, true_type)
1498 new (__dest._M_access()) _Functor(__source._M_access<_Functor>());
1501 // Clone a function object that is not location-invariant or
1502 // that cannot fit into an _Any_data structure.
1504 _M_clone(_Any_data& __dest, const _Any_data& __source, false_type)
1506 __dest._M_access<_Functor*>() =
1507 new _Functor(*__source._M_access<_Functor*>());
1510 // Destroying a location-invariant object may still require
1513 _M_destroy(_Any_data& __victim, true_type)
1515 __victim._M_access<_Functor>().~_Functor();
1518 // Destroying an object located on the heap.
1520 _M_destroy(_Any_data& __victim, false_type)
1522 delete __victim._M_access<_Functor*>();
1527 _M_manager(_Any_data& __dest, const _Any_data& __source,
1528 _Manager_operation __op)
1532 case __get_type_info:
1533 __dest._M_access<const type_info*>() = &typeid(_Functor);
1536 case __get_functor_ptr:
1537 __dest._M_access<_Functor*>() = _M_get_pointer(__source);
1540 case __clone_functor:
1541 _M_clone(__dest, __source, _Local_storage());
1544 case __destroy_functor:
1545 _M_destroy(__dest, _Local_storage());
1552 _M_init_functor(_Any_data& __functor, const _Functor& __f)
1553 { _M_init_functor(__functor, __f, _Local_storage()); }
1555 template<typename _Signature>
1557 _M_not_empty_function(const function<_Signature>& __f)
1560 template<typename _Tp>
1562 _M_not_empty_function(const _Tp*& __fp)
1565 template<typename _Class, typename _Tp>
1567 _M_not_empty_function(_Tp _Class::* const& __mp)
1570 template<typename _Tp>
1572 _M_not_empty_function(const _Tp&)
1577 _M_init_functor(_Any_data& __functor, const _Functor& __f, true_type)
1578 { new (__functor._M_access()) _Functor(__f); }
1581 _M_init_functor(_Any_data& __functor, const _Functor& __f, false_type)
1582 { __functor._M_access<_Functor*>() = new _Functor(__f); }
1585 template<typename _Functor>
1586 class _Ref_manager : public _Base_manager<_Functor*>
1588 typedef _Function_base::_Base_manager<_Functor*> _Base;
1592 _M_manager(_Any_data& __dest, const _Any_data& __source,
1593 _Manager_operation __op)
1597 case __get_type_info:
1598 __dest._M_access<const type_info*>() = &typeid(_Functor);
1601 case __get_functor_ptr:
1602 __dest._M_access<_Functor*>() = *_Base::_M_get_pointer(__source);
1603 return is_const<_Functor>::value;
1607 _Base::_M_manager(__dest, __source, __op);
1613 _M_init_functor(_Any_data& __functor, reference_wrapper<_Functor> __f)
1615 // TBD: Use address_of function instead.
1616 _Base::_M_init_functor(__functor, &__f.get());
1620 _Function_base() : _M_manager(0) { }
1625 _M_manager(_M_functor, _M_functor, __destroy_functor);
1629 bool _M_empty() const { return !_M_manager; }
1631 typedef bool (*_Manager_type)(_Any_data&, const _Any_data&,
1632 _Manager_operation);
1634 _Any_data _M_functor;
1635 _Manager_type _M_manager;
1638 template<typename _Signature, typename _Functor>
1639 class _Function_handler;
1641 template<typename _Res, typename _Functor, typename... _ArgTypes>
1642 class _Function_handler<_Res(_ArgTypes...), _Functor>
1643 : public _Function_base::_Base_manager<_Functor>
1645 typedef _Function_base::_Base_manager<_Functor> _Base;
1649 _M_invoke(const _Any_data& __functor, _ArgTypes... __args)
1651 return (*_Base::_M_get_pointer(__functor))(__args...);
1655 template<typename _Functor, typename... _ArgTypes>
1656 class _Function_handler<void(_ArgTypes...), _Functor>
1657 : public _Function_base::_Base_manager<_Functor>
1659 typedef _Function_base::_Base_manager<_Functor> _Base;
1663 _M_invoke(const _Any_data& __functor, _ArgTypes... __args)
1665 (*_Base::_M_get_pointer(__functor))(__args...);
1669 template<typename _Res, typename _Functor, typename... _ArgTypes>
1670 class _Function_handler<_Res(_ArgTypes...), reference_wrapper<_Functor> >
1671 : public _Function_base::_Ref_manager<_Functor>
1673 typedef _Function_base::_Ref_manager<_Functor> _Base;
1677 _M_invoke(const _Any_data& __functor, _ArgTypes... __args)
1680 __callable_functor(**_Base::_M_get_pointer(__functor))(__args...);
1684 template<typename _Functor, typename... _ArgTypes>
1685 class _Function_handler<void(_ArgTypes...), reference_wrapper<_Functor> >
1686 : public _Function_base::_Ref_manager<_Functor>
1688 typedef _Function_base::_Ref_manager<_Functor> _Base;
1692 _M_invoke(const _Any_data& __functor, _ArgTypes... __args)
1694 __callable_functor(**_Base::_M_get_pointer(__functor))(__args...);
1698 template<typename _Class, typename _Member, typename _Res,
1699 typename... _ArgTypes>
1700 class _Function_handler<_Res(_ArgTypes...), _Member _Class::*>
1701 : public _Function_handler<void(_ArgTypes...), _Member _Class::*>
1703 typedef _Function_handler<void(_ArgTypes...), _Member _Class::*>
1708 _M_invoke(const _Any_data& __functor, _ArgTypes... __args)
1711 mem_fn(_Base::_M_get_pointer(__functor)->__value)(__args...);
1715 template<typename _Class, typename _Member, typename... _ArgTypes>
1716 class _Function_handler<void(_ArgTypes...), _Member _Class::*>
1717 : public _Function_base::_Base_manager<
1718 _Simple_type_wrapper< _Member _Class::* > >
1720 typedef _Member _Class::* _Functor;
1721 typedef _Simple_type_wrapper<_Functor> _Wrapper;
1722 typedef _Function_base::_Base_manager<_Wrapper> _Base;
1726 _M_manager(_Any_data& __dest, const _Any_data& __source,
1727 _Manager_operation __op)
1731 case __get_type_info:
1732 __dest._M_access<const type_info*>() = &typeid(_Functor);
1735 case __get_functor_ptr:
1736 __dest._M_access<_Functor*>() =
1737 &_Base::_M_get_pointer(__source)->__value;
1741 _Base::_M_manager(__dest, __source, __op);
1747 _M_invoke(const _Any_data& __functor, _ArgTypes... __args)
1750 mem_fn(_Base::_M_get_pointer(__functor)->__value)(__args...);
1754 template<typename _Res, typename... _ArgTypes>
1755 class function<_Res(_ArgTypes...)>
1756 : public _Maybe_unary_or_binary_function<_Res, _ArgTypes...>,
1757 private _Function_base
1759 /// This class is used to implement the safe_bool idiom.
1762 _Hidden_type* _M_bool;
1765 /// This typedef is used to implement the safe_bool idiom.
1766 typedef _Hidden_type* _Hidden_type::* _Safe_bool;
1768 typedef _Res _Signature_type(_ArgTypes...);
1770 struct _Useless { };
1773 typedef _Res result_type;
1775 // [3.7.2.1] construct/copy/destroy
1778 * @brief Default construct creates an empty function call wrapper.
1779 * @post @c !(bool)*this
1781 function() : _Function_base() { }
1784 * @brief Default construct creates an empty function call wrapper.
1785 * @post @c !(bool)*this
1787 function(_M_clear_type*) : _Function_base() { }
1790 * @brief %Function copy constructor.
1791 * @param x A %function object with identical call signature.
1792 * @pre @c (bool)*this == (bool)x
1794 * The newly-created %function contains a copy of the target of @a
1795 * x (if it has one).
1797 function(const function& __x);
1800 * @brief Builds a %function that targets a copy of the incoming
1802 * @param f A %function object that is callable with parameters of
1803 * type @c T1, @c T2, ..., @c TN and returns a value convertible
1806 * The newly-created %function object will target a copy of @a
1807 * f. If @a f is @c reference_wrapper<F>, then this function
1808 * object will contain a reference to the function object @c
1809 * f.get(). If @a f is a NULL function pointer or NULL
1810 * pointer-to-member, the newly-created object will be empty.
1812 * If @a f is a non-NULL function pointer or an object of type @c
1813 * reference_wrapper<F>, this function will not throw.
1815 template<typename _Functor>
1816 function(_Functor __f,
1817 typename __gnu_cxx::__enable_if<
1818 !is_integral<_Functor>::value, _Useless>::__type
1822 * @brief %Function assignment operator.
1823 * @param x A %function with identical call signature.
1824 * @post @c (bool)*this == (bool)x
1827 * The target of @a x is copied to @c *this. If @a x has no
1828 * target, then @c *this will be empty.
1830 * If @a x targets a function pointer or a reference to a function
1831 * object, then this operation will not throw an exception.
1834 operator=(const function& __x)
1836 function(__x).swap(*this);
1841 * @brief %Function assignment to zero.
1842 * @post @c !(bool)*this
1845 * The target of @a *this is deallocated, leaving it empty.
1848 operator=(_M_clear_type*)
1852 _M_manager(_M_functor, _M_functor, __destroy_functor);
1860 * @brief %Function assignment to a new target.
1861 * @param f A %function object that is callable with parameters of
1862 * type @c T1, @c T2, ..., @c TN and returns a value convertible
1866 * This %function object wrapper will target a copy of @a
1867 * f. If @a f is @c reference_wrapper<F>, then this function
1868 * object will contain a reference to the function object @c
1869 * f.get(). If @a f is a NULL function pointer or NULL
1870 * pointer-to-member, @c this object will be empty.
1872 * If @a f is a non-NULL function pointer or an object of type @c
1873 * reference_wrapper<F>, this function will not throw.
1875 template<typename _Functor>
1876 typename __gnu_cxx::__enable_if<!is_integral<_Functor>::value,
1878 operator=(_Functor __f)
1880 function(__f).swap(*this);
1884 // [3.7.2.2] function modifiers
1887 * @brief Swap the targets of two %function objects.
1888 * @param f A %function with identical call signature.
1890 * Swap the targets of @c this function object and @a f. This
1891 * function will not throw an exception.
1893 void swap(function& __x)
1895 _Any_data __old_functor = _M_functor;
1896 _M_functor = __x._M_functor;
1897 __x._M_functor = __old_functor;
1898 _Manager_type __old_manager = _M_manager;
1899 _M_manager = __x._M_manager;
1900 __x._M_manager = __old_manager;
1901 _Invoker_type __old_invoker = _M_invoker;
1902 _M_invoker = __x._M_invoker;
1903 __x._M_invoker = __old_invoker;
1906 // [3.7.2.3] function capacity
1909 * @brief Determine if the %function wrapper has a target.
1911 * @return @c true when this %function object contains a target,
1912 * or @c false when it is empty.
1914 * This function will not throw an exception.
1916 operator _Safe_bool() const
1921 return &_Hidden_type::_M_bool;
1924 // [3.7.2.4] function invocation
1927 * @brief Invokes the function targeted by @c *this.
1928 * @returns the result of the target.
1929 * @throws bad_function_call when @c !(bool)*this
1931 * The function call operator invokes the target function object
1932 * stored by @c this.
1934 _Res operator()(_ArgTypes... __args) const;
1936 // [3.7.2.5] function target access
1938 * @brief Determine the type of the target of this function object
1941 * @returns the type identifier of the target function object, or
1942 * @c typeid(void) if @c !(bool)*this.
1944 * This function will not throw an exception.
1946 const type_info& target_type() const;
1949 * @brief Access the stored target function object.
1951 * @return Returns a pointer to the stored target function object,
1952 * if @c typeid(Functor).equals(target_type()); otherwise, a NULL
1955 * This function will not throw an exception.
1957 template<typename _Functor> _Functor* target();
1960 template<typename _Functor> const _Functor* target() const;
1963 // [3.7.2.6] undefined operators
1964 template<typename _Function>
1965 void operator==(const function<_Function>&) const;
1966 template<typename _Function>
1967 void operator!=(const function<_Function>&) const;
1969 typedef _Res (*_Invoker_type)(const _Any_data&, _ArgTypes...);
1970 _Invoker_type _M_invoker;
1973 template<typename _Res, typename... _ArgTypes>
1974 function<_Res(_ArgTypes...)>::
1975 function(const function& __x)
1980 _M_invoker = __x._M_invoker;
1981 _M_manager = __x._M_manager;
1982 __x._M_manager(_M_functor, __x._M_functor, __clone_functor);
1986 template<typename _Res, typename... _ArgTypes>
1987 template<typename _Functor>
1988 function<_Res(_ArgTypes...)>::
1989 function(_Functor __f,
1990 typename __gnu_cxx::__enable_if<
1991 !is_integral<_Functor>::value, _Useless>::__type)
1994 typedef _Function_handler<_Signature_type, _Functor> _My_handler;
1996 if (_My_handler::_M_not_empty_function(__f))
1998 _M_invoker = &_My_handler::_M_invoke;
1999 _M_manager = &_My_handler::_M_manager;
2000 _My_handler::_M_init_functor(_M_functor, __f);
2004 template<typename _Res, typename... _ArgTypes>
2006 function<_Res(_ArgTypes...)>::
2007 operator()(_ArgTypes... __args) const
2012 throw bad_function_call();
2017 return _M_invoker(_M_functor, __args...);
2020 template<typename _Res, typename... _ArgTypes>
2022 function<_Res(_ArgTypes...)>::
2027 _Any_data __typeinfo_result;
2028 _M_manager(__typeinfo_result, _M_functor, __get_type_info);
2029 return *__typeinfo_result._M_access<const type_info*>();
2032 return typeid(void);
2035 template<typename _Res, typename... _ArgTypes>
2036 template<typename _Functor>
2038 function<_Res(_ArgTypes...)>::
2041 if (typeid(_Functor) == target_type() && _M_manager)
2044 if (_M_manager(__ptr, _M_functor, __get_functor_ptr)
2045 && !is_const<_Functor>::value)
2048 return __ptr._M_access<_Functor*>();
2054 template<typename _Res, typename... _ArgTypes>
2055 template<typename _Functor>
2057 function<_Res(_ArgTypes...)>::
2060 if (typeid(_Functor) == target_type() && _M_manager)
2063 _M_manager(__ptr, _M_functor, __get_functor_ptr);
2064 return __ptr._M_access<const _Functor*>();
2070 // [3.7.2.7] null pointer comparisons
2073 * @brief Compares a polymorphic function object wrapper against 0
2074 * (the NULL pointer).
2075 * @returns @c true if the wrapper has no target, @c false otherwise
2077 * This function will not throw an exception.
2079 template<typename _Signature>
2081 operator==(const function<_Signature>& __f, _M_clear_type*)
2085 template<typename _Signature>
2087 operator==(_M_clear_type*, const function<_Signature>& __f)
2091 * @brief Compares a polymorphic function object wrapper against 0
2092 * (the NULL pointer).
2093 * @returns @c false if the wrapper has no target, @c true otherwise
2095 * This function will not throw an exception.
2097 template<typename _Signature>
2099 operator!=(const function<_Signature>& __f, _M_clear_type*)
2103 template<typename _Signature>
2105 operator!=(_M_clear_type*, const function<_Signature>& __f)
2108 // [3.7.2.8] specialized algorithms
2111 * @brief Swap the targets of two polymorphic function object wrappers.
2113 * This function will not throw an exception.
2115 template<typename _Signature>
2117 swap(function<_Signature>& __x, function<_Signature>& __y)
2120 _GLIBCXX_END_NAMESPACE_TR1