functional revision 246468 
1// -*- C++ -*-
2//===------------------------ functional ----------------------------------===//
3//
4//                     The LLVM Compiler Infrastructure
5//
6// This file is dual licensed under the MIT and the University of Illinois Open
7// Source Licenses. See LICENSE.TXT for details.
8//
9//===----------------------------------------------------------------------===//
10
11#ifndef _LIBCPP_FUNCTIONAL
12#define _LIBCPP_FUNCTIONAL
13
14/*
15    functional synopsis
16
17namespace std
18{
19
20template <class Arg, class Result>
21struct unary_function
22{
23    typedef Arg    argument_type;
24    typedef Result result_type;
25};
26
27template <class Arg1, class Arg2, class Result>
28struct binary_function
29{
30    typedef Arg1   first_argument_type;
31    typedef Arg2   second_argument_type;
32    typedef Result result_type;
33};
34
35template <class T>
36class reference_wrapper
37    : public unary_function<T1, R> // if wrapping a unary functor
38    : public binary_function<T1, T2, R> // if wraping a binary functor
39{
40public:
41    // types
42    typedef T type;
43    typedef see below result_type; // Not always defined
44
45    // construct/copy/destroy
46    reference_wrapper(T&) noexcept;
47    reference_wrapper(T&&) = delete; // do not bind to temps
48    reference_wrapper(const reference_wrapper<T>& x) noexcept;
49
50    // assignment
51    reference_wrapper& operator=(const reference_wrapper<T>& x) noexcept;
52
53    // access
54    operator T& () const noexcept;
55    T& get() const noexcept;
56
57    // invoke
58    template <class... ArgTypes>
59      typename result_of<T(ArgTypes...)>::type
60          operator() (ArgTypes&&...) const;
61};
62
63template <class T> reference_wrapper<T> ref(T& t) noexcept;
64template <class T> void ref(const T&& t) = delete;
65template <class T> reference_wrapper<T> ref(reference_wrapper<T>t) noexcept;
66
67template <class T> reference_wrapper<const T> cref(const T& t) noexcept;
68template <class T> void cref(const T&& t) = delete;
69template <class T> reference_wrapper<const T> cref(reference_wrapper<T> t) noexcept;
70
71template <class T>
72struct plus : binary_function<T, T, T>
73{
74    T operator()(const T& x, const T& y) const;
75};
76
77template <class T>
78struct minus : binary_function<T, T, T>
79{
80    T operator()(const T& x, const T& y) const;
81};
82
83template <class T>
84struct multiplies : binary_function<T, T, T>
85{
86    T operator()(const T& x, const T& y) const;
87};
88
89template <class T>
90struct divides : binary_function<T, T, T>
91{
92    T operator()(const T& x, const T& y) const;
93};
94
95template <class T>
96struct modulus : binary_function<T, T, T>
97{
98    T operator()(const T& x, const T& y) const;
99};
100
101template <class T>
102struct negate : unary_function<T, T>
103{
104    T operator()(const T& x) const;
105};
106
107template <class T>
108struct equal_to : binary_function<T, T, bool>
109{
110    bool operator()(const T& x, const T& y) const;
111};
112
113template <class T>
114struct not_equal_to : binary_function<T, T, bool>
115{
116    bool operator()(const T& x, const T& y) const;
117};
118
119template <class T>
120struct greater : binary_function<T, T, bool>
121{
122    bool operator()(const T& x, const T& y) const;
123};
124
125template <class T>
126struct less : binary_function<T, T, bool>
127{
128    bool operator()(const T& x, const T& y) const;
129};
130
131template <class T>
132struct greater_equal : binary_function<T, T, bool>
133{
134    bool operator()(const T& x, const T& y) const;
135};
136
137template <class T>
138struct less_equal : binary_function<T, T, bool>
139{
140    bool operator()(const T& x, const T& y) const;
141};
142
143template <class T>
144struct logical_and : binary_function<T, T, bool>
145{
146    bool operator()(const T& x, const T& y) const;
147};
148
149template <class T>
150struct logical_or : binary_function<T, T, bool>
151{
152    bool operator()(const T& x, const T& y) const;
153};
154
155template <class T>
156struct logical_not : unary_function<T, bool>
157{
158    bool operator()(const T& x) const;
159};
160
161template <class Predicate>
162class unary_negate
163    : public unary_function<typename Predicate::argument_type, bool>
164{
165public:
166    explicit unary_negate(const Predicate& pred);
167    bool operator()(const typename Predicate::argument_type& x) const;
168};
169
170template <class Predicate> unary_negate<Predicate> not1(const Predicate& pred);
171
172template <class Predicate>
173class binary_negate
174    : public binary_function<typename Predicate::first_argument_type,
175                             typename Predicate::second_argument_type,
176                             bool>
177{
178public:
179    explicit binary_negate(const Predicate& pred);
180    bool operator()(const typename Predicate::first_argument_type& x,
181                    const typename Predicate::second_argument_type& y) const;
182};
183
184template <class Predicate> binary_negate<Predicate> not2(const Predicate& pred);
185
186template<class T> struct is_bind_expression;
187template<class T> struct is_placeholder;
188
189template<class Fn, class... BoundArgs>
190  unspecified bind(Fn&&, BoundArgs&&...);
191template<class R, class Fn, class... BoundArgs>
192  unspecified bind(Fn&&, BoundArgs&&...);
193
194namespace placeholders {
195  // M is the implementation-defined number of placeholders
196  extern unspecified _1;
197  extern unspecified _2;
198  .
199  .
200  .
201  extern unspecified _Mp;
202}
203
204template <class Operation>
205class binder1st
206    : public unary_function<typename Operation::second_argument_type,
207                            typename Operation::result_type>
208{
209protected:
210    Operation                               op;
211    typename Operation::first_argument_type value;
212public:
213    binder1st(const Operation& x, const typename Operation::first_argument_type y);
214    typename Operation::result_type operator()(      typename Operation::second_argument_type& x) const;
215    typename Operation::result_type operator()(const typename Operation::second_argument_type& x) const;
216};
217
218template <class Operation, class T>
219binder1st<Operation> bind1st(const Operation& op, const T& x);
220
221template <class Operation>
222class binder2nd
223    : public unary_function<typename Operation::first_argument_type,
224                            typename Operation::result_type>
225{
226protected:
227    Operation                                op;
228    typename Operation::second_argument_type value;
229public:
230    binder2nd(const Operation& x, const typename Operation::second_argument_type y);
231    typename Operation::result_type operator()(      typename Operation::first_argument_type& x) const;
232    typename Operation::result_type operator()(const typename Operation::first_argument_type& x) const;
233};
234
235template <class Operation, class T>
236binder2nd<Operation> bind2nd(const Operation& op, const T& x);
237
238template <class Arg, class Result>
239class pointer_to_unary_function : public unary_function<Arg, Result>
240{
241public:
242    explicit pointer_to_unary_function(Result (*f)(Arg));
243    Result operator()(Arg x) const;
244};
245
246template <class Arg, class Result>
247pointer_to_unary_function<Arg,Result> ptr_fun(Result (*f)(Arg));
248
249template <class Arg1, class Arg2, class Result>
250class pointer_to_binary_function : public binary_function<Arg1, Arg2, Result>
251{
252public:
253    explicit pointer_to_binary_function(Result (*f)(Arg1, Arg2));
254    Result operator()(Arg1 x, Arg2 y) const;
255};
256
257template <class Arg1, class Arg2, class Result>
258pointer_to_binary_function<Arg1,Arg2,Result> ptr_fun(Result (*f)(Arg1,Arg2));
259
260template<class S, class T>
261class mem_fun_t : public unary_function<T*, S>
262{
263public:
264    explicit mem_fun_t(S (T::*p)());
265    S operator()(T* p) const;
266};
267
268template<class S, class T, class A>
269class mem_fun1_t : public binary_function<T*, A, S>
270{
271public:
272    explicit mem_fun1_t(S (T::*p)(A));
273    S operator()(T* p, A x) const;
274};
275
276template<class S, class T>          mem_fun_t<S,T>    mem_fun(S (T::*f)());
277template<class S, class T, class A> mem_fun1_t<S,T,A> mem_fun(S (T::*f)(A));
278
279template<class S, class T>
280class mem_fun_ref_t : public unary_function<T, S>
281{
282public:
283    explicit mem_fun_ref_t(S (T::*p)());
284    S operator()(T& p) const;
285};
286
287template<class S, class T, class A>
288class mem_fun1_ref_t : public binary_function<T, A, S>
289{
290public:
291    explicit mem_fun1_ref_t(S (T::*p)(A));
292    S operator()(T& p, A x) const;
293};
294
295template<class S, class T>          mem_fun_ref_t<S,T>    mem_fun_ref(S (T::*f)());
296template<class S, class T, class A> mem_fun1_ref_t<S,T,A> mem_fun_ref(S (T::*f)(A));
297
298template <class S, class T>
299class const_mem_fun_t : public unary_function<const T*, S>
300{
301public:
302    explicit const_mem_fun_t(S (T::*p)() const);
303    S operator()(const T* p) const;
304};
305
306template <class S, class T, class A>
307class const_mem_fun1_t : public binary_function<const T*, A, S>
308{
309public:
310    explicit const_mem_fun1_t(S (T::*p)(A) const);
311    S operator()(const T* p, A x) const;
312};
313
314template <class S, class T>          const_mem_fun_t<S,T>    mem_fun(S (T::*f)() const);
315template <class S, class T, class A> const_mem_fun1_t<S,T,A> mem_fun(S (T::*f)(A) const);
316
317template <class S, class T>
318class const_mem_fun_ref_t : public unary_function<T, S>
319{
320public:
321    explicit const_mem_fun_ref_t(S (T::*p)() const);
322    S operator()(const T& p) const;
323};
324
325template <class S, class T, class A>
326class const_mem_fun1_ref_t : public binary_function<T, A, S>
327{
328public:
329    explicit const_mem_fun1_ref_t(S (T::*p)(A) const);
330    S operator()(const T& p, A x) const;
331};
332
333template <class S, class T>          const_mem_fun_ref_t<S,T>    mem_fun_ref(S (T::*f)() const);
334template <class S, class T, class A> const_mem_fun1_ref_t<S,T,A> mem_fun_ref(S (T::*f)(A) const);
335
336template<class R, class T> unspecified mem_fn(R T::*);
337template<class R, class T, class... Args> unspecified mem_fn(R (T::*)(Args...));
338template<class R, class T, class... Args> unspecified mem_fn(R (T::*)(Args...) const);
339template<class R, class T, class... Args> unspecified mem_fn(R (T::*)(Args...) volatile);
340template<class R, class T, class... Args> unspecified mem_fn(R (T::*)(Args...) const volatile);
341template<class R, class T, class... Args> unspecified mem_fn(R (T::*)(Args...) &);
342template<class R, class T, class... Args> unspecified mem_fn(R (T::*)(Args...) const &);
343template<class R, class T, class... Args> unspecified mem_fn(R (T::*)(Args...) volatile &);
344template<class R, class T, class... Args> unspecified mem_fn(R (T::*)(Args...) const volatile &);
345template<class R, class T, class... Args> unspecified mem_fn(R (T::*)(Args...) &&);
346template<class R, class T, class... Args> unspecified mem_fn(R (T::*)(Args...) const &&);
347template<class R, class T, class... Args> unspecified mem_fn(R (T::*)(Args...) volatile &&);
348template<class R, class T, class... Args> unspecified mem_fn(R (T::*)(Args...) const volatile &&);
349
350class bad_function_call
351    : public exception
352{
353};
354
355template<class> class function; // undefined
356
357template<class R, class... ArgTypes>
358class function<R(ArgTypes...)>
359  : public unary_function<T1, R>      // iff sizeof...(ArgTypes) == 1 and
360                                      // ArgTypes contains T1
361  : public binary_function<T1, T2, R> // iff sizeof...(ArgTypes) == 2 and
362                                      // ArgTypes contains T1 and T2
363{
364public:
365    typedef R result_type;
366
367    // construct/copy/destroy:
368    function() noexcept;
369    function(nullptr_t) noexcept;
370    function(const function&);
371    function(function&&) noexcept;
372    template<class F>
373      function(F);
374    template<Allocator Alloc>
375      function(allocator_arg_t, const Alloc&) noexcept;
376    template<Allocator Alloc>
377      function(allocator_arg_t, const Alloc&, nullptr_t) noexcept;
378    template<Allocator Alloc>
379      function(allocator_arg_t, const Alloc&, const function&);
380    template<Allocator Alloc>
381      function(allocator_arg_t, const Alloc&, function&&);
382    template<class F, Allocator Alloc>
383      function(allocator_arg_t, const Alloc&, F);
384
385    function& operator=(const function&);
386    function& operator=(function&&) noexcept;
387    function& operator=(nullptr_t) noexcept;
388    template<class F>
389      function& operator=(F&&);
390    template<class F>
391      function& operator=(reference_wrapper<F>) noexcept;
392
393    ~function();
394
395    // function modifiers:
396    void swap(function&) noexcept;
397    template<class F, class Alloc>
398      void assign(F&&, const Alloc&);
399
400    // function capacity:
401    explicit operator bool() const noexcept;
402
403    // function invocation:
404    R operator()(ArgTypes...) const;
405
406    // function target access:
407    const std::type_info& target_type() const noexcept;
408    template <typename T>       T* target() noexcept;
409    template <typename T> const T* target() const noexcept;
410};
411
412// Null pointer comparisons:
413template <class R, class ... ArgTypes>
414  bool operator==(const function<R(ArgTypes...)>&, nullptr_t) noexcept;
415
416template <class R, class ... ArgTypes>
417  bool operator==(nullptr_t, const function<R(ArgTypes...)>&) noexcept;
418
419template <class R, class ... ArgTypes>
420  bool operator!=(const function<R(ArgTypes...)>&, nullptr_t) noexcept;
421
422template <class  R, class ... ArgTypes>
423  bool operator!=(nullptr_t, const function<R(ArgTypes...)>&) noexcept;
424
425// specialized algorithms:
426template <class  R, class ... ArgTypes>
427  void swap(function<R(ArgTypes...)>&, function<R(ArgTypes...)>&) noexcept;
428
429template <class T> struct hash;
430
431template <> struct hash<bool>;
432template <> struct hash<char>;
433template <> struct hash<signed char>;
434template <> struct hash<unsigned char>;
435template <> struct hash<char16_t>;
436template <> struct hash<char32_t>;
437template <> struct hash<wchar_t>;
438template <> struct hash<short>;
439template <> struct hash<unsigned short>;
440template <> struct hash<int>;
441template <> struct hash<unsigned int>;
442template <> struct hash<long>;
443template <> struct hash<long long>;
444template <> struct hash<unsigned long>;
445template <> struct hash<unsigned long long>;
446
447template <> struct hash<float>;
448template <> struct hash<double>;
449template <> struct hash<long double>;
450
451template<class T> struct hash<T*>;
452
453}  // std
454
455POLICY:  For non-variadic implementations, the number of arguments is limited
456         to 3.  It is hoped that the need for non-variadic implementations
457         will be minimal.
458
459*/
460
461#include <__config>
462#include <type_traits>
463#include <typeinfo>
464#include <exception>
465#include <memory>
466#include <tuple>
467
468#include <__functional_base>
469
470#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
471#pragma GCC system_header
472#endif
473
474_LIBCPP_BEGIN_NAMESPACE_STD
475
476template <class _Tp>
477struct _LIBCPP_VISIBLE plus : binary_function<_Tp, _Tp, _Tp>
478{
479    _LIBCPP_INLINE_VISIBILITY _Tp operator()(const _Tp& __x, const _Tp& __y) const
480        {return __x + __y;}
481};
482
483template <class _Tp>
484struct _LIBCPP_VISIBLE minus : binary_function<_Tp, _Tp, _Tp>
485{
486    _LIBCPP_INLINE_VISIBILITY _Tp operator()(const _Tp& __x, const _Tp& __y) const
487        {return __x - __y;}
488};
489
490template <class _Tp>
491struct _LIBCPP_VISIBLE multiplies : binary_function<_Tp, _Tp, _Tp>
492{
493    _LIBCPP_INLINE_VISIBILITY _Tp operator()(const _Tp& __x, const _Tp& __y) const
494        {return __x * __y;}
495};
496
497template <class _Tp>
498struct _LIBCPP_VISIBLE divides : binary_function<_Tp, _Tp, _Tp>
499{
500    _LIBCPP_INLINE_VISIBILITY _Tp operator()(const _Tp& __x, const _Tp& __y) const
501        {return __x / __y;}
502};
503
504template <class _Tp>
505struct _LIBCPP_VISIBLE modulus : binary_function<_Tp, _Tp, _Tp>
506{
507    _LIBCPP_INLINE_VISIBILITY _Tp operator()(const _Tp& __x, const _Tp& __y) const
508        {return __x % __y;}
509};
510
511template <class _Tp>
512struct _LIBCPP_VISIBLE negate : unary_function<_Tp, _Tp>
513{
514    _LIBCPP_INLINE_VISIBILITY _Tp operator()(const _Tp& __x) const
515        {return -__x;}
516};
517
518template <class _Tp>
519struct _LIBCPP_VISIBLE equal_to : binary_function<_Tp, _Tp, bool>
520{
521    _LIBCPP_INLINE_VISIBILITY bool operator()(const _Tp& __x, const _Tp& __y) const
522        {return __x == __y;}
523};
524
525template <class _Tp>
526struct _LIBCPP_VISIBLE not_equal_to : binary_function<_Tp, _Tp, bool>
527{
528    _LIBCPP_INLINE_VISIBILITY bool operator()(const _Tp& __x, const _Tp& __y) const
529        {return __x != __y;}
530};
531
532template <class _Tp>
533struct _LIBCPP_VISIBLE greater : binary_function<_Tp, _Tp, bool>
534{
535    _LIBCPP_INLINE_VISIBILITY bool operator()(const _Tp& __x, const _Tp& __y) const
536        {return __x > __y;}
537};
538
539// less in <__functional_base>
540
541template <class _Tp>
542struct _LIBCPP_VISIBLE greater_equal : binary_function<_Tp, _Tp, bool>
543{
544    _LIBCPP_INLINE_VISIBILITY bool operator()(const _Tp& __x, const _Tp& __y) const
545        {return __x >= __y;}
546};
547
548template <class _Tp>
549struct _LIBCPP_VISIBLE less_equal : binary_function<_Tp, _Tp, bool>
550{
551    _LIBCPP_INLINE_VISIBILITY bool operator()(const _Tp& __x, const _Tp& __y) const
552        {return __x <= __y;}
553};
554
555template <class _Tp>
556struct _LIBCPP_VISIBLE logical_and : binary_function<_Tp, _Tp, bool>
557{
558    _LIBCPP_INLINE_VISIBILITY bool operator()(const _Tp& __x, const _Tp& __y) const
559        {return __x && __y;}
560};
561
562template <class _Tp>
563struct _LIBCPP_VISIBLE logical_or : binary_function<_Tp, _Tp, bool>
564{
565    _LIBCPP_INLINE_VISIBILITY bool operator()(const _Tp& __x, const _Tp& __y) const
566        {return __x || __y;}
567};
568
569template <class _Tp>
570struct _LIBCPP_VISIBLE logical_not : unary_function<_Tp, bool>
571{
572    _LIBCPP_INLINE_VISIBILITY bool operator()(const _Tp& __x) const
573        {return !__x;}
574};
575
576template <class _Tp>
577struct _LIBCPP_VISIBLE bit_and : binary_function<_Tp, _Tp, _Tp>
578{
579    _LIBCPP_INLINE_VISIBILITY _Tp operator()(const _Tp& __x, const _Tp& __y) const
580        {return __x & __y;}
581};
582
583template <class _Tp>
584struct _LIBCPP_VISIBLE bit_or : binary_function<_Tp, _Tp, _Tp>
585{
586    _LIBCPP_INLINE_VISIBILITY _Tp operator()(const _Tp& __x, const _Tp& __y) const
587        {return __x | __y;}
588};
589
590template <class _Tp>
591struct _LIBCPP_VISIBLE bit_xor : binary_function<_Tp, _Tp, _Tp>
592{
593    _LIBCPP_INLINE_VISIBILITY _Tp operator()(const _Tp& __x, const _Tp& __y) const
594        {return __x ^ __y;}
595};
596
597template <class _Predicate>
598class _LIBCPP_VISIBLE unary_negate
599    : public unary_function<typename _Predicate::argument_type, bool>
600{
601    _Predicate __pred_;
602public:
603    _LIBCPP_INLINE_VISIBILITY explicit unary_negate(const _Predicate& __pred)
604        : __pred_(__pred) {}
605    _LIBCPP_INLINE_VISIBILITY bool operator()(const typename _Predicate::argument_type& __x) const
606        {return !__pred_(__x);}
607};
608
609template <class _Predicate>
610inline _LIBCPP_INLINE_VISIBILITY
611unary_negate<_Predicate>
612not1(const _Predicate& __pred) {return unary_negate<_Predicate>(__pred);}
613
614template <class _Predicate>
615class _LIBCPP_VISIBLE binary_negate
616    : public binary_function<typename _Predicate::first_argument_type,
617                             typename _Predicate::second_argument_type,
618                             bool>
619{
620    _Predicate __pred_;
621public:
622    _LIBCPP_INLINE_VISIBILITY explicit binary_negate(const _Predicate& __pred)
623        : __pred_(__pred) {}
624    _LIBCPP_INLINE_VISIBILITY bool operator()(const typename _Predicate::first_argument_type& __x,
625                    const typename _Predicate::second_argument_type& __y) const
626        {return !__pred_(__x, __y);}
627};
628
629template <class _Predicate>
630inline _LIBCPP_INLINE_VISIBILITY
631binary_negate<_Predicate>
632not2(const _Predicate& __pred) {return binary_negate<_Predicate>(__pred);}
633
634template <class __Operation>
635class _LIBCPP_VISIBLE binder1st
636    : public unary_function<typename __Operation::second_argument_type,
637                            typename __Operation::result_type>
638{
639protected:
640    __Operation                               op;
641    typename __Operation::first_argument_type value;
642public:
643    _LIBCPP_INLINE_VISIBILITY binder1st(const __Operation& __x,
644                               const typename __Operation::first_argument_type __y)
645        : op(__x), value(__y) {}
646    _LIBCPP_INLINE_VISIBILITY typename __Operation::result_type operator()
647        (typename __Operation::second_argument_type& __x) const
648            {return op(value, __x);}
649    _LIBCPP_INLINE_VISIBILITY typename __Operation::result_type operator()
650        (const typename __Operation::second_argument_type& __x) const
651            {return op(value, __x);}
652};
653
654template <class __Operation, class _Tp>
655inline _LIBCPP_INLINE_VISIBILITY
656binder1st<__Operation>
657bind1st(const __Operation& __op, const _Tp& __x)
658    {return binder1st<__Operation>(__op, __x);}
659
660template <class __Operation>
661class _LIBCPP_VISIBLE binder2nd
662    : public unary_function<typename __Operation::first_argument_type,
663                            typename __Operation::result_type>
664{
665protected:
666    __Operation                                op;
667    typename __Operation::second_argument_type value;
668public:
669    _LIBCPP_INLINE_VISIBILITY
670    binder2nd(const __Operation& __x, const typename __Operation::second_argument_type __y)
671        : op(__x), value(__y) {}
672    _LIBCPP_INLINE_VISIBILITY typename __Operation::result_type operator()
673        (      typename __Operation::first_argument_type& __x) const
674            {return op(__x, value);}
675    _LIBCPP_INLINE_VISIBILITY typename __Operation::result_type operator()
676        (const typename __Operation::first_argument_type& __x) const
677            {return op(__x, value);}
678};
679
680template <class __Operation, class _Tp>
681inline _LIBCPP_INLINE_VISIBILITY
682binder2nd<__Operation>
683bind2nd(const __Operation& __op, const _Tp& __x)
684    {return binder2nd<__Operation>(__op, __x);}
685
686template <class _Arg, class _Result>
687class _LIBCPP_VISIBLE pointer_to_unary_function
688    : public unary_function<_Arg, _Result>
689{
690    _Result (*__f_)(_Arg);
691public:
692    _LIBCPP_INLINE_VISIBILITY explicit pointer_to_unary_function(_Result (*__f)(_Arg))
693        : __f_(__f) {}
694    _LIBCPP_INLINE_VISIBILITY _Result operator()(_Arg __x) const
695        {return __f_(__x);}
696};
697
698template <class _Arg, class _Result>
699inline _LIBCPP_INLINE_VISIBILITY
700pointer_to_unary_function<_Arg,_Result>
701ptr_fun(_Result (*__f)(_Arg))
702    {return pointer_to_unary_function<_Arg,_Result>(__f);}
703
704template <class _Arg1, class _Arg2, class _Result>
705class _LIBCPP_VISIBLE pointer_to_binary_function
706    : public binary_function<_Arg1, _Arg2, _Result>
707{
708    _Result (*__f_)(_Arg1, _Arg2);
709public:
710    _LIBCPP_INLINE_VISIBILITY explicit pointer_to_binary_function(_Result (*__f)(_Arg1, _Arg2))
711        : __f_(__f) {}
712    _LIBCPP_INLINE_VISIBILITY _Result operator()(_Arg1 __x, _Arg2 __y) const
713        {return __f_(__x, __y);}
714};
715
716template <class _Arg1, class _Arg2, class _Result>
717inline _LIBCPP_INLINE_VISIBILITY
718pointer_to_binary_function<_Arg1,_Arg2,_Result>
719ptr_fun(_Result (*__f)(_Arg1,_Arg2))
720    {return pointer_to_binary_function<_Arg1,_Arg2,_Result>(__f);}
721
722template<class _Sp, class _Tp>
723class _LIBCPP_VISIBLE mem_fun_t : public unary_function<_Tp*, _Sp>
724{
725    _Sp (_Tp::*__p_)();
726public:
727    _LIBCPP_INLINE_VISIBILITY explicit mem_fun_t(_Sp (_Tp::*__p)())
728        : __p_(__p) {}
729    _LIBCPP_INLINE_VISIBILITY _Sp operator()(_Tp* __p) const
730        {return (__p->*__p_)();}
731};
732
733template<class _Sp, class _Tp, class _Ap>
734class _LIBCPP_VISIBLE mem_fun1_t : public binary_function<_Tp*, _Ap, _Sp>
735{
736    _Sp (_Tp::*__p_)(_Ap);
737public:
738    _LIBCPP_INLINE_VISIBILITY explicit mem_fun1_t(_Sp (_Tp::*__p)(_Ap))
739        : __p_(__p) {}
740    _LIBCPP_INLINE_VISIBILITY _Sp operator()(_Tp* __p, _Ap __x) const
741        {return (__p->*__p_)(__x);}
742};
743
744template<class _Sp, class _Tp>
745inline _LIBCPP_INLINE_VISIBILITY
746mem_fun_t<_Sp,_Tp>
747mem_fun(_Sp (_Tp::*__f)())
748    {return mem_fun_t<_Sp,_Tp>(__f);}
749
750template<class _Sp, class _Tp, class _Ap>
751inline _LIBCPP_INLINE_VISIBILITY
752mem_fun1_t<_Sp,_Tp,_Ap>
753mem_fun(_Sp (_Tp::*__f)(_Ap))
754    {return mem_fun1_t<_Sp,_Tp,_Ap>(__f);}
755
756template<class _Sp, class _Tp>
757class _LIBCPP_VISIBLE mem_fun_ref_t : public unary_function<_Tp, _Sp>
758{
759    _Sp (_Tp::*__p_)();
760public:
761    _LIBCPP_INLINE_VISIBILITY explicit mem_fun_ref_t(_Sp (_Tp::*__p)())
762        : __p_(__p) {}
763    _LIBCPP_INLINE_VISIBILITY _Sp operator()(_Tp& __p) const
764        {return (__p.*__p_)();}
765};
766
767template<class _Sp, class _Tp, class _Ap>
768class _LIBCPP_VISIBLE mem_fun1_ref_t : public binary_function<_Tp, _Ap, _Sp>
769{
770    _Sp (_Tp::*__p_)(_Ap);
771public:
772    _LIBCPP_INLINE_VISIBILITY explicit mem_fun1_ref_t(_Sp (_Tp::*__p)(_Ap))
773        : __p_(__p) {}
774    _LIBCPP_INLINE_VISIBILITY _Sp operator()(_Tp& __p, _Ap __x) const
775        {return (__p.*__p_)(__x);}
776};
777
778template<class _Sp, class _Tp>
779inline _LIBCPP_INLINE_VISIBILITY
780mem_fun_ref_t<_Sp,_Tp>
781mem_fun_ref(_Sp (_Tp::*__f)())
782    {return mem_fun_ref_t<_Sp,_Tp>(__f);}
783
784template<class _Sp, class _Tp, class _Ap>
785inline _LIBCPP_INLINE_VISIBILITY
786mem_fun1_ref_t<_Sp,_Tp,_Ap>
787mem_fun_ref(_Sp (_Tp::*__f)(_Ap))
788    {return mem_fun1_ref_t<_Sp,_Tp,_Ap>(__f);}
789
790template <class _Sp, class _Tp>
791class _LIBCPP_VISIBLE const_mem_fun_t : public unary_function<const _Tp*, _Sp>
792{
793    _Sp (_Tp::*__p_)() const;
794public:
795    _LIBCPP_INLINE_VISIBILITY explicit const_mem_fun_t(_Sp (_Tp::*__p)() const)
796        : __p_(__p) {}
797    _LIBCPP_INLINE_VISIBILITY _Sp operator()(const _Tp* __p) const
798        {return (__p->*__p_)();}
799};
800
801template <class _Sp, class _Tp, class _Ap>
802class _LIBCPP_VISIBLE const_mem_fun1_t : public binary_function<const _Tp*, _Ap, _Sp>
803{
804    _Sp (_Tp::*__p_)(_Ap) const;
805public:
806    _LIBCPP_INLINE_VISIBILITY explicit const_mem_fun1_t(_Sp (_Tp::*__p)(_Ap) const)
807        : __p_(__p) {}
808    _LIBCPP_INLINE_VISIBILITY _Sp operator()(const _Tp* __p, _Ap __x) const
809        {return (__p->*__p_)(__x);}
810};
811
812template <class _Sp, class _Tp>
813inline _LIBCPP_INLINE_VISIBILITY
814const_mem_fun_t<_Sp,_Tp>
815mem_fun(_Sp (_Tp::*__f)() const)
816    {return const_mem_fun_t<_Sp,_Tp>(__f);}
817
818template <class _Sp, class _Tp, class _Ap>
819inline _LIBCPP_INLINE_VISIBILITY
820const_mem_fun1_t<_Sp,_Tp,_Ap>
821mem_fun(_Sp (_Tp::*__f)(_Ap) const)
822    {return const_mem_fun1_t<_Sp,_Tp,_Ap>(__f);}
823
824template <class _Sp, class _Tp>
825class _LIBCPP_VISIBLE const_mem_fun_ref_t : public unary_function<_Tp, _Sp>
826{
827    _Sp (_Tp::*__p_)() const;
828public:
829    _LIBCPP_INLINE_VISIBILITY explicit const_mem_fun_ref_t(_Sp (_Tp::*__p)() const)
830        : __p_(__p) {}
831    _LIBCPP_INLINE_VISIBILITY _Sp operator()(const _Tp& __p) const
832        {return (__p.*__p_)();}
833};
834
835template <class _Sp, class _Tp, class _Ap>
836class _LIBCPP_VISIBLE const_mem_fun1_ref_t
837    : public binary_function<_Tp, _Ap, _Sp>
838{
839    _Sp (_Tp::*__p_)(_Ap) const;
840public:
841    _LIBCPP_INLINE_VISIBILITY explicit const_mem_fun1_ref_t(_Sp (_Tp::*__p)(_Ap) const)
842        : __p_(__p) {}
843    _LIBCPP_INLINE_VISIBILITY _Sp operator()(const _Tp& __p, _Ap __x) const
844        {return (__p.*__p_)(__x);}
845};
846
847template <class _Sp, class _Tp>
848inline _LIBCPP_INLINE_VISIBILITY
849const_mem_fun_ref_t<_Sp,_Tp>
850mem_fun_ref(_Sp (_Tp::*__f)() const)
851    {return const_mem_fun_ref_t<_Sp,_Tp>(__f);}
852
853template <class _Sp, class _Tp, class _Ap>
854inline _LIBCPP_INLINE_VISIBILITY
855const_mem_fun1_ref_t<_Sp,_Tp,_Ap>
856mem_fun_ref(_Sp (_Tp::*__f)(_Ap) const)
857    {return const_mem_fun1_ref_t<_Sp,_Tp,_Ap>(__f);}
858
859#ifdef _LIBCPP_HAS_NO_VARIADICS
860
861#include <__functional_03>
862
863#else  // _LIBCPP_HAS_NO_VARIADICS
864
865template <class _Tp>
866class __mem_fn
867    : public __weak_result_type<_Tp>
868{
869public:
870    // types
871    typedef _Tp type;
872private:
873    type __f_;
874
875public:
876    _LIBCPP_INLINE_VISIBILITY __mem_fn(type __f) : __f_(__f) {}
877
878    // invoke
879    template <class... _ArgTypes>
880       _LIBCPP_INLINE_VISIBILITY
881       typename __invoke_return<type, _ArgTypes...>::type
882          operator() (_ArgTypes&&... __args)
883          {
884              return __invoke(__f_, _VSTD::forward<_ArgTypes>(__args)...);
885          }
886};
887
888template<class _Rp, class _Tp>
889inline _LIBCPP_INLINE_VISIBILITY
890__mem_fn<_Rp _Tp::*>
891mem_fn(_Rp _Tp::* __pm)
892{
893    return __mem_fn<_Rp _Tp::*>(__pm);
894}
895
896template<class _Rp, class _Tp, class ..._Args>
897inline _LIBCPP_INLINE_VISIBILITY
898__mem_fn<_Rp (_Tp::*)(_Args...)>
899mem_fn(_Rp (_Tp::* __pm)(_Args...))
900{
901    return __mem_fn<_Rp (_Tp::*)(_Args...)>(__pm);
902}
903
904template<class _Rp, class _Tp, class ..._Args>
905inline _LIBCPP_INLINE_VISIBILITY
906__mem_fn<_Rp (_Tp::*)(_Args...) const>
907mem_fn(_Rp (_Tp::* __pm)(_Args...) const)
908{
909    return __mem_fn<_Rp (_Tp::*)(_Args...) const>(__pm);
910}
911
912template<class _Rp, class _Tp, class ..._Args>
913inline _LIBCPP_INLINE_VISIBILITY
914__mem_fn<_Rp (_Tp::*)(_Args...) volatile>
915mem_fn(_Rp (_Tp::* __pm)(_Args...) volatile)
916{
917    return __mem_fn<_Rp (_Tp::*)(_Args...) volatile>(__pm);
918}
919
920template<class _Rp, class _Tp, class ..._Args>
921inline _LIBCPP_INLINE_VISIBILITY
922__mem_fn<_Rp (_Tp::*)(_Args...) const volatile>
923mem_fn(_Rp (_Tp::* __pm)(_Args...) const volatile)
924{
925    return __mem_fn<_Rp (_Tp::*)(_Args...) const volatile>(__pm);
926}
927
928// bad_function_call
929
930class _LIBCPP_EXCEPTION_ABI bad_function_call
931    : public exception
932{
933};
934
935template<class _Fp> class _LIBCPP_VISIBLE function; // undefined
936
937namespace __function
938{
939
940template<class _Rp, class ..._ArgTypes>
941struct __maybe_derive_from_unary_function
942{
943};
944
945template<class _Rp, class _A1>
946struct __maybe_derive_from_unary_function<_Rp(_A1)>
947    : public unary_function<_A1, _Rp>
948{
949};
950
951template<class _Rp, class ..._ArgTypes>
952struct __maybe_derive_from_binary_function
953{
954};
955
956template<class _Rp, class _A1, class _A2>
957struct __maybe_derive_from_binary_function<_Rp(_A1, _A2)>
958    : public binary_function<_A1, _A2, _Rp>
959{
960};
961
962template<class _Fp> class __base;
963
964template<class _Rp, class ..._ArgTypes>
965class __base<_Rp(_ArgTypes...)>
966{
967    __base(const __base&);
968    __base& operator=(const __base&);
969public:
970    _LIBCPP_INLINE_VISIBILITY __base() {}
971    _LIBCPP_INLINE_VISIBILITY virtual ~__base() {}
972    virtual __base* __clone() const = 0;
973    virtual void __clone(__base*) const = 0;
974    virtual void destroy() _NOEXCEPT = 0;
975    virtual void destroy_deallocate() _NOEXCEPT = 0;
976    virtual _Rp operator()(_ArgTypes&& ...) = 0;
977#ifndef _LIBCPP_NO_RTTI
978    virtual const void* target(const type_info&) const _NOEXCEPT = 0;
979    virtual const std::type_info& target_type() const _NOEXCEPT = 0;
980#endif  // _LIBCPP_NO_RTTI
981};
982
983template<class _FD, class _Alloc, class _FB> class __func;
984
985template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
986class __func<_Fp, _Alloc, _Rp(_ArgTypes...)>
987    : public  __base<_Rp(_ArgTypes...)>
988{
989    __compressed_pair<_Fp, _Alloc> __f_;
990public:
991    _LIBCPP_INLINE_VISIBILITY
992    explicit __func(_Fp&& __f)
993        : __f_(piecewise_construct, _VSTD::forward_as_tuple(_VSTD::move(__f)),
994                                    _VSTD::forward_as_tuple()) {}
995    _LIBCPP_INLINE_VISIBILITY
996    explicit __func(const _Fp& __f, const _Alloc& __a)
997        : __f_(piecewise_construct, _VSTD::forward_as_tuple(__f),
998                                    _VSTD::forward_as_tuple(__a)) {}
999
1000    _LIBCPP_INLINE_VISIBILITY
1001    explicit __func(const _Fp& __f, _Alloc&& __a)
1002        : __f_(piecewise_construct, _VSTD::forward_as_tuple(__f),
1003                                    _VSTD::forward_as_tuple(_VSTD::move(__a))) {}
1004
1005    _LIBCPP_INLINE_VISIBILITY
1006    explicit __func(_Fp&& __f, _Alloc&& __a)
1007        : __f_(piecewise_construct, _VSTD::forward_as_tuple(_VSTD::move(__f)),
1008                                    _VSTD::forward_as_tuple(_VSTD::move(__a))) {}
1009    virtual __base<_Rp(_ArgTypes...)>* __clone() const;
1010    virtual void __clone(__base<_Rp(_ArgTypes...)>*) const;
1011    virtual void destroy() _NOEXCEPT;
1012    virtual void destroy_deallocate() _NOEXCEPT;
1013    virtual _Rp operator()(_ArgTypes&& ... __arg);
1014#ifndef _LIBCPP_NO_RTTI
1015    virtual const void* target(const type_info&) const _NOEXCEPT;
1016    virtual const std::type_info& target_type() const _NOEXCEPT;
1017#endif  // _LIBCPP_NO_RTTI
1018};
1019
1020template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
1021__base<_Rp(_ArgTypes...)>*
1022__func<_Fp, _Alloc, _Rp(_ArgTypes...)>::__clone() const
1023{
1024    typedef typename _Alloc::template rebind<__func>::other _Ap;
1025    _Ap __a(__f_.second());
1026    typedef __allocator_destructor<_Ap> _Dp;
1027    unique_ptr<__func, _Dp> __hold(__a.allocate(1), _Dp(__a, 1));
1028    ::new (__hold.get()) __func(__f_.first(), _Alloc(__a));
1029    return __hold.release();
1030}
1031
1032template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
1033void
1034__func<_Fp, _Alloc, _Rp(_ArgTypes...)>::__clone(__base<_Rp(_ArgTypes...)>* __p) const
1035{
1036    ::new (__p) __func(__f_.first(), __f_.second());
1037}
1038
1039template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
1040void
1041__func<_Fp, _Alloc, _Rp(_ArgTypes...)>::destroy() _NOEXCEPT
1042{
1043    __f_.~__compressed_pair<_Fp, _Alloc>();
1044}
1045
1046template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
1047void
1048__func<_Fp, _Alloc, _Rp(_ArgTypes...)>::destroy_deallocate() _NOEXCEPT
1049{
1050    typedef typename _Alloc::template rebind<__func>::other _Ap;
1051    _Ap __a(__f_.second());
1052    __f_.~__compressed_pair<_Fp, _Alloc>();
1053    __a.deallocate(this, 1);
1054}
1055
1056template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
1057_Rp
1058__func<_Fp, _Alloc, _Rp(_ArgTypes...)>::operator()(_ArgTypes&& ... __arg)
1059{
1060    return __invoke(__f_.first(), _VSTD::forward<_ArgTypes>(__arg)...);
1061}
1062
1063#ifndef _LIBCPP_NO_RTTI
1064
1065template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
1066const void*
1067__func<_Fp, _Alloc, _Rp(_ArgTypes...)>::target(const type_info& __ti) const _NOEXCEPT
1068{
1069    if (__ti == typeid(_Fp))
1070        return &__f_.first();
1071    return (const void*)0;
1072}
1073
1074template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
1075const std::type_info&
1076__func<_Fp, _Alloc, _Rp(_ArgTypes...)>::target_type() const _NOEXCEPT
1077{
1078    return typeid(_Fp);
1079}
1080
1081#endif  // _LIBCPP_NO_RTTI
1082
1083}  // __function
1084
1085template<class _Rp, class ..._ArgTypes>
1086class _LIBCPP_VISIBLE function<_Rp(_ArgTypes...)>
1087    : public __function::__maybe_derive_from_unary_function<_Rp(_ArgTypes...)>,
1088      public __function::__maybe_derive_from_binary_function<_Rp(_ArgTypes...)>
1089{
1090    typedef __function::__base<_Rp(_ArgTypes...)> __base;
1091    typename aligned_storage<3*sizeof(void*)>::type __buf_;
1092    __base* __f_;
1093
1094    template <class _Fp>
1095        _LIBCPP_INLINE_VISIBILITY
1096        static bool __not_null(const _Fp&) {return true;}
1097    template <class _R2, class ..._Ap>
1098        _LIBCPP_INLINE_VISIBILITY
1099        static bool __not_null(_R2 (*__p)(_Ap...)) {return __p;}
1100    template <class _R2, class _Cp, class ..._Ap>
1101        _LIBCPP_INLINE_VISIBILITY
1102        static bool __not_null(_R2 (_Cp::*__p)(_Ap...)) {return __p;}
1103    template <class _R2, class _Cp, class ..._Ap>
1104        _LIBCPP_INLINE_VISIBILITY
1105        static bool __not_null(_R2 (_Cp::*__p)(_Ap...) const) {return __p;}
1106    template <class _R2, class _Cp, class ..._Ap>
1107        _LIBCPP_INLINE_VISIBILITY
1108        static bool __not_null(_R2 (_Cp::*__p)(_Ap...) volatile) {return __p;}
1109    template <class _R2, class _Cp, class ..._Ap>
1110        _LIBCPP_INLINE_VISIBILITY
1111        static bool __not_null(_R2 (_Cp::*__p)(_Ap...) const volatile) {return __p;}
1112    template <class _R2, class ..._Ap>
1113        _LIBCPP_INLINE_VISIBILITY
1114        static bool __not_null(const function<_Rp(_Ap...)>& __p) {return __p;}
1115
1116    template <class _Fp, bool = !is_same<_Fp, function>::value &&
1117                                __invokable<_Fp&, _ArgTypes...>::value>
1118        struct __callable;
1119    template <class _Fp>
1120        struct __callable<_Fp, true>
1121        {
1122            static const bool value =
1123                is_convertible<typename __invoke_of<_Fp&, _ArgTypes...>::type,
1124                               _Rp>::value;
1125        };
1126    template <class _Fp>
1127        struct __callable<_Fp, false>
1128        {
1129            static const bool value = false;
1130        };
1131public:
1132    typedef _Rp result_type;
1133
1134    // construct/copy/destroy:
1135    _LIBCPP_INLINE_VISIBILITY
1136    function() _NOEXCEPT : __f_(0) {}
1137    _LIBCPP_INLINE_VISIBILITY
1138    function(nullptr_t) _NOEXCEPT : __f_(0) {}
1139    function(const function&);
1140    function(function&&) _NOEXCEPT;
1141    template<class _Fp>
1142      function(_Fp,
1143               typename enable_if<__callable<_Fp>::value>::type* = 0);
1144
1145    template<class _Alloc>
1146      _LIBCPP_INLINE_VISIBILITY
1147      function(allocator_arg_t, const _Alloc&) _NOEXCEPT : __f_(0) {}
1148    template<class _Alloc>
1149      _LIBCPP_INLINE_VISIBILITY
1150      function(allocator_arg_t, const _Alloc&, nullptr_t) _NOEXCEPT : __f_(0) {}
1151    template<class _Alloc>
1152      function(allocator_arg_t, const _Alloc&, const function&);
1153    template<class _Alloc>
1154      function(allocator_arg_t, const _Alloc&, function&&);
1155    template<class _Fp, class _Alloc>
1156      function(allocator_arg_t, const _Alloc& __a, _Fp __f,
1157               typename enable_if<__callable<_Fp>::value>::type* = 0);
1158
1159    function& operator=(const function&);
1160    function& operator=(function&&) _NOEXCEPT;
1161    function& operator=(nullptr_t) _NOEXCEPT;
1162    template<class _Fp>
1163      typename enable_if
1164      <
1165        __callable<typename decay<_Fp>::type>::value,
1166        function&
1167      >::type
1168      operator=(_Fp&&);
1169
1170    ~function();
1171
1172    // function modifiers:
1173    void swap(function&) _NOEXCEPT;
1174    template<class _Fp, class _Alloc>
1175      _LIBCPP_INLINE_VISIBILITY
1176      void assign(_Fp&& __f, const _Alloc& __a)
1177        {function(allocator_arg, __a, _VSTD::forward<_Fp>(__f)).swap(*this);}
1178
1179    // function capacity:
1180    _LIBCPP_INLINE_VISIBILITY
1181        _LIBCPP_EXPLICIT operator bool() const _NOEXCEPT {return __f_;}
1182
1183    // deleted overloads close possible hole in the type system
1184    template<class _R2, class... _ArgTypes2>
1185      bool operator==(const function<_R2(_ArgTypes2...)>&) const = delete;
1186    template<class _R2, class... _ArgTypes2>
1187      bool operator!=(const function<_R2(_ArgTypes2...)>&) const = delete;
1188public:
1189    // function invocation:
1190    _Rp operator()(_ArgTypes...) const;
1191
1192#ifndef _LIBCPP_NO_RTTI
1193    // function target access:
1194    const std::type_info& target_type() const _NOEXCEPT;
1195    template <typename _Tp> _Tp* target() _NOEXCEPT;
1196    template <typename _Tp> const _Tp* target() const _NOEXCEPT;
1197#endif  // _LIBCPP_NO_RTTI
1198};
1199
1200template<class _Rp, class ..._ArgTypes>
1201function<_Rp(_ArgTypes...)>::function(const function& __f)
1202{
1203    if (__f.__f_ == 0)
1204        __f_ = 0;
1205    else if (__f.__f_ == (const __base*)&__f.__buf_)
1206    {
1207        __f_ = (__base*)&__buf_;
1208        __f.__f_->__clone(__f_);
1209    }
1210    else
1211        __f_ = __f.__f_->__clone();
1212}
1213
1214template<class _Rp, class ..._ArgTypes>
1215template <class _Alloc>
1216function<_Rp(_ArgTypes...)>::function(allocator_arg_t, const _Alloc&,
1217                                     const function& __f)
1218{
1219    if (__f.__f_ == 0)
1220        __f_ = 0;
1221    else if (__f.__f_ == (const __base*)&__f.__buf_)
1222    {
1223        __f_ = (__base*)&__buf_;
1224        __f.__f_->__clone(__f_);
1225    }
1226    else
1227        __f_ = __f.__f_->__clone();
1228}
1229
1230template<class _Rp, class ..._ArgTypes>
1231function<_Rp(_ArgTypes...)>::function(function&& __f) _NOEXCEPT
1232{
1233    if (__f.__f_ == 0)
1234        __f_ = 0;
1235    else if (__f.__f_ == (__base*)&__f.__buf_)
1236    {
1237        __f_ = (__base*)&__buf_;
1238        __f.__f_->__clone(__f_);
1239    }
1240    else
1241    {
1242        __f_ = __f.__f_;
1243        __f.__f_ = 0;
1244    }
1245}
1246
1247template<class _Rp, class ..._ArgTypes>
1248template <class _Alloc>
1249function<_Rp(_ArgTypes...)>::function(allocator_arg_t, const _Alloc&,
1250                                     function&& __f)
1251{
1252    if (__f.__f_ == 0)
1253        __f_ = 0;
1254    else if (__f.__f_ == (__base*)&__f.__buf_)
1255    {
1256        __f_ = (__base*)&__buf_;
1257        __f.__f_->__clone(__f_);
1258    }
1259    else
1260    {
1261        __f_ = __f.__f_;
1262        __f.__f_ = 0;
1263    }
1264}
1265
1266template<class _Rp, class ..._ArgTypes>
1267template <class _Fp>
1268function<_Rp(_ArgTypes...)>::function(_Fp __f,
1269                                     typename enable_if<__callable<_Fp>::value>::type*)
1270    : __f_(0)
1271{
1272    if (__not_null(__f))
1273    {
1274        typedef __function::__func<_Fp, allocator<_Fp>, _Rp(_ArgTypes...)> _FF;
1275        if (sizeof(_FF) <= sizeof(__buf_) && is_nothrow_copy_constructible<_Fp>::value)
1276        {
1277            __f_ = (__base*)&__buf_;
1278            ::new (__f_) _FF(_VSTD::move(__f));
1279        }
1280        else
1281        {
1282            typedef allocator<_FF> _Ap;
1283            _Ap __a;
1284            typedef __allocator_destructor<_Ap> _Dp;
1285            unique_ptr<__base, _Dp> __hold(__a.allocate(1), _Dp(__a, 1));
1286            ::new (__hold.get()) _FF(_VSTD::move(__f), allocator<_Fp>(__a));
1287            __f_ = __hold.release();
1288        }
1289    }
1290}
1291
1292template<class _Rp, class ..._ArgTypes>
1293template <class _Fp, class _Alloc>
1294function<_Rp(_ArgTypes...)>::function(allocator_arg_t, const _Alloc& __a0, _Fp __f,
1295                                     typename enable_if<__callable<_Fp>::value>::type*)
1296    : __f_(0)
1297{
1298    typedef allocator_traits<_Alloc> __alloc_traits;
1299    if (__not_null(__f))
1300    {
1301        typedef __function::__func<_Fp, _Alloc, _Rp(_ArgTypes...)> _FF;
1302        if (sizeof(_FF) <= sizeof(__buf_) && is_nothrow_copy_constructible<_Fp>::value)
1303        {
1304            __f_ = (__base*)&__buf_;
1305            ::new (__f_) _FF(_VSTD::move(__f));
1306        }
1307        else
1308        {
1309            typedef typename __alloc_traits::template
1310#ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
1311                rebind_alloc<_FF>
1312#else
1313                rebind_alloc<_FF>::other
1314#endif
1315                                                         _Ap;
1316            _Ap __a(__a0);
1317            typedef __allocator_destructor<_Ap> _Dp;
1318            unique_ptr<__base, _Dp> __hold(__a.allocate(1), _Dp(__a, 1));
1319            ::new (__hold.get()) _FF(_VSTD::move(__f), _Alloc(__a));
1320            __f_ = __hold.release();
1321        }
1322    }
1323}
1324
1325template<class _Rp, class ..._ArgTypes>
1326function<_Rp(_ArgTypes...)>&
1327function<_Rp(_ArgTypes...)>::operator=(const function& __f)
1328{
1329    function(__f).swap(*this);
1330    return *this;
1331}
1332
1333template<class _Rp, class ..._ArgTypes>
1334function<_Rp(_ArgTypes...)>&
1335function<_Rp(_ArgTypes...)>::operator=(function&& __f) _NOEXCEPT
1336{
1337    if (__f_ == (__base*)&__buf_)
1338        __f_->destroy();
1339    else if (__f_)
1340        __f_->destroy_deallocate();
1341    __f_ = 0;
1342    if (__f.__f_ == 0)
1343        __f_ = 0;
1344    else if (__f.__f_ == (__base*)&__f.__buf_)
1345    {
1346        __f_ = (__base*)&__buf_;
1347        __f.__f_->__clone(__f_);
1348    }
1349    else
1350    {
1351        __f_ = __f.__f_;
1352        __f.__f_ = 0;
1353    }
1354    return *this;
1355}
1356
1357template<class _Rp, class ..._ArgTypes>
1358function<_Rp(_ArgTypes...)>&
1359function<_Rp(_ArgTypes...)>::operator=(nullptr_t) _NOEXCEPT
1360{
1361    if (__f_ == (__base*)&__buf_)
1362        __f_->destroy();
1363    else if (__f_)
1364        __f_->destroy_deallocate();
1365    __f_ = 0;
1366    return *this;
1367}
1368
1369template<class _Rp, class ..._ArgTypes>
1370template <class _Fp>
1371typename enable_if
1372<
1373    function<_Rp(_ArgTypes...)>::template __callable<typename decay<_Fp>::type>::value,
1374    function<_Rp(_ArgTypes...)>&
1375>::type
1376function<_Rp(_ArgTypes...)>::operator=(_Fp&& __f)
1377{
1378    function(_VSTD::forward<_Fp>(__f)).swap(*this);
1379    return *this;
1380}
1381
1382template<class _Rp, class ..._ArgTypes>
1383function<_Rp(_ArgTypes...)>::~function()
1384{
1385    if (__f_ == (__base*)&__buf_)
1386        __f_->destroy();
1387    else if (__f_)
1388        __f_->destroy_deallocate();
1389}
1390
1391template<class _Rp, class ..._ArgTypes>
1392void
1393function<_Rp(_ArgTypes...)>::swap(function& __f) _NOEXCEPT
1394{
1395    if (__f_ == (__base*)&__buf_ && __f.__f_ == (__base*)&__f.__buf_)
1396    {
1397        typename aligned_storage<sizeof(__buf_)>::type __tempbuf;
1398        __base* __t = (__base*)&__tempbuf;
1399        __f_->__clone(__t);
1400        __f_->destroy();
1401        __f_ = 0;
1402        __f.__f_->__clone((__base*)&__buf_);
1403        __f.__f_->destroy();
1404        __f.__f_ = 0;
1405        __f_ = (__base*)&__buf_;
1406        __t->__clone((__base*)&__f.__buf_);
1407        __t->destroy();
1408        __f.__f_ = (__base*)&__f.__buf_;
1409    }
1410    else if (__f_ == (__base*)&__buf_)
1411    {
1412        __f_->__clone((__base*)&__f.__buf_);
1413        __f_->destroy();
1414        __f_ = __f.__f_;
1415        __f.__f_ = (__base*)&__f.__buf_;
1416    }
1417    else if (__f.__f_ == (__base*)&__f.__buf_)
1418    {
1419        __f.__f_->__clone((__base*)&__buf_);
1420        __f.__f_->destroy();
1421        __f.__f_ = __f_;
1422        __f_ = (__base*)&__buf_;
1423    }
1424    else
1425        _VSTD::swap(__f_, __f.__f_);
1426}
1427
1428template<class _Rp, class ..._ArgTypes>
1429_Rp
1430function<_Rp(_ArgTypes...)>::operator()(_ArgTypes... __arg) const
1431{
1432#ifndef _LIBCPP_NO_EXCEPTIONS
1433    if (__f_ == 0)
1434        throw bad_function_call();
1435#endif  // _LIBCPP_NO_EXCEPTIONS
1436    return (*__f_)(_VSTD::forward<_ArgTypes>(__arg)...);
1437}
1438
1439#ifndef _LIBCPP_NO_RTTI
1440
1441template<class _Rp, class ..._ArgTypes>
1442const std::type_info&
1443function<_Rp(_ArgTypes...)>::target_type() const _NOEXCEPT
1444{
1445    if (__f_ == 0)
1446        return typeid(void);
1447    return __f_->target_type();
1448}
1449
1450template<class _Rp, class ..._ArgTypes>
1451template <typename _Tp>
1452_Tp*
1453function<_Rp(_ArgTypes...)>::target() _NOEXCEPT
1454{
1455    if (__f_ == 0)
1456        return (_Tp*)0;
1457    return (_Tp*)__f_->target(typeid(_Tp));
1458}
1459
1460template<class _Rp, class ..._ArgTypes>
1461template <typename _Tp>
1462const _Tp*
1463function<_Rp(_ArgTypes...)>::target() const _NOEXCEPT
1464{
1465    if (__f_ == 0)
1466        return (const _Tp*)0;
1467    return (const _Tp*)__f_->target(typeid(_Tp));
1468}
1469
1470#endif  // _LIBCPP_NO_RTTI
1471
1472template <class _Rp, class... _ArgTypes>
1473inline _LIBCPP_INLINE_VISIBILITY
1474bool
1475operator==(const function<_Rp(_ArgTypes...)>& __f, nullptr_t) _NOEXCEPT {return !__f;}
1476
1477template <class _Rp, class... _ArgTypes>
1478inline _LIBCPP_INLINE_VISIBILITY
1479bool
1480operator==(nullptr_t, const function<_Rp(_ArgTypes...)>& __f) _NOEXCEPT {return !__f;}
1481
1482template <class _Rp, class... _ArgTypes>
1483inline _LIBCPP_INLINE_VISIBILITY
1484bool
1485operator!=(const function<_Rp(_ArgTypes...)>& __f, nullptr_t) _NOEXCEPT {return (bool)__f;}
1486
1487template <class _Rp, class... _ArgTypes>
1488inline _LIBCPP_INLINE_VISIBILITY
1489bool
1490operator!=(nullptr_t, const function<_Rp(_ArgTypes...)>& __f) _NOEXCEPT {return (bool)__f;}
1491
1492template <class _Rp, class... _ArgTypes>
1493inline _LIBCPP_INLINE_VISIBILITY
1494void
1495swap(function<_Rp(_ArgTypes...)>& __x, function<_Rp(_ArgTypes...)>& __y) _NOEXCEPT
1496{return __x.swap(__y);}
1497
1498template<class _Tp> struct __is_bind_expression : public false_type {};
1499template<class _Tp> struct _LIBCPP_VISIBLE is_bind_expression
1500    : public __is_bind_expression<typename remove_cv<_Tp>::type> {};
1501
1502template<class _Tp> struct __is_placeholder : public integral_constant<int, 0> {};
1503template<class _Tp> struct _LIBCPP_VISIBLE is_placeholder
1504    : public __is_placeholder<typename remove_cv<_Tp>::type> {};
1505
1506namespace placeholders
1507{
1508
1509template <int _Np> struct __ph {};
1510
1511extern __ph<1>   _1;
1512extern __ph<2>   _2;
1513extern __ph<3>   _3;
1514extern __ph<4>   _4;
1515extern __ph<5>   _5;
1516extern __ph<6>   _6;
1517extern __ph<7>   _7;
1518extern __ph<8>   _8;
1519extern __ph<9>   _9;
1520extern __ph<10> _10;
1521
1522}  // placeholders
1523
1524template<int _Np>
1525struct __is_placeholder<placeholders::__ph<_Np> >
1526    : public integral_constant<int, _Np> {};
1527
1528template <class _Tp, class _Uj>
1529inline _LIBCPP_INLINE_VISIBILITY
1530_Tp&
1531__mu(reference_wrapper<_Tp> __t, _Uj&)
1532{
1533    return __t.get();
1534}
1535
1536template <class _Ti, class ..._Uj, size_t ..._Indx>
1537inline _LIBCPP_INLINE_VISIBILITY
1538typename __invoke_of<_Ti&, _Uj...>::type
1539__mu_expand(_Ti& __ti, tuple<_Uj...>& __uj, __tuple_indices<_Indx...>)
1540{
1541    return __ti(_VSTD::forward<_Uj>(get<_Indx>(__uj))...);
1542}
1543
1544template <class _Ti, class ..._Uj>
1545inline _LIBCPP_INLINE_VISIBILITY
1546typename enable_if
1547<
1548    is_bind_expression<_Ti>::value,
1549    typename __invoke_of<_Ti&, _Uj...>::type
1550>::type
1551__mu(_Ti& __ti, tuple<_Uj...>& __uj)
1552{
1553    typedef typename __make_tuple_indices<sizeof...(_Uj)>::type __indices;
1554    return  __mu_expand(__ti, __uj, __indices());
1555}
1556
1557template <bool IsPh, class _Ti, class _Uj>
1558struct __mu_return2 {};
1559
1560template <class _Ti, class _Uj>
1561struct __mu_return2<true, _Ti, _Uj>
1562{
1563    typedef typename tuple_element<is_placeholder<_Ti>::value - 1, _Uj>::type type;
1564};
1565
1566template <class _Ti, class _Uj>
1567inline _LIBCPP_INLINE_VISIBILITY
1568typename enable_if
1569<
1570    0 < is_placeholder<_Ti>::value,
1571    typename __mu_return2<0 < is_placeholder<_Ti>::value, _Ti, _Uj>::type
1572>::type
1573__mu(_Ti&, _Uj& __uj)
1574{
1575    const size_t _Indx = is_placeholder<_Ti>::value - 1;
1576    return _VSTD::forward<typename tuple_element<_Indx, _Uj>::type>(get<_Indx>(__uj));
1577}
1578
1579template <class _Ti, class _Uj>
1580inline _LIBCPP_INLINE_VISIBILITY
1581typename enable_if
1582<
1583    !is_bind_expression<_Ti>::value &&
1584    is_placeholder<_Ti>::value == 0 &&
1585    !__is_reference_wrapper<_Ti>::value,
1586    _Ti&
1587>::type
1588__mu(_Ti& __ti, _Uj&)
1589{
1590    return __ti;
1591}
1592
1593template <class _Ti, bool IsReferenceWrapper, bool IsBindEx, bool IsPh,
1594          class _TupleUj>
1595struct ____mu_return;
1596
1597template <class _Ti, class ..._Uj>
1598struct ____mu_return<_Ti, false, true, false, tuple<_Uj...> >
1599{
1600    typedef typename __invoke_of<_Ti&, _Uj...>::type type;
1601};
1602
1603template <class _Ti, class _TupleUj>
1604struct ____mu_return<_Ti, false, false, true, _TupleUj>
1605{
1606    typedef typename tuple_element<is_placeholder<_Ti>::value - 1,
1607                                   _TupleUj>::type&& type;
1608};
1609
1610template <class _Ti, class _TupleUj>
1611struct ____mu_return<_Ti, true, false, false, _TupleUj>
1612{
1613    typedef typename _Ti::type& type;
1614};
1615
1616template <class _Ti, class _TupleUj>
1617struct ____mu_return<_Ti, false, false, false, _TupleUj>
1618{
1619    typedef _Ti& type;
1620};
1621
1622template <class _Ti, class _TupleUj>
1623struct __mu_return
1624    : public ____mu_return<_Ti,
1625                           __is_reference_wrapper<_Ti>::value,
1626                           is_bind_expression<_Ti>::value,
1627                           0 < is_placeholder<_Ti>::value,
1628                           _TupleUj>
1629{
1630};
1631
1632template <class _Fp, class _BoundArgs, class _TupleUj>
1633struct __bind_return;
1634
1635template <class _Fp, class ..._BoundArgs, class _TupleUj>
1636struct __bind_return<_Fp, tuple<_BoundArgs...>, _TupleUj>
1637{
1638    typedef typename __invoke_of
1639    <
1640        _Fp&,
1641        typename __mu_return
1642        <
1643            _BoundArgs,
1644            _TupleUj
1645        >::type...
1646    >::type type;
1647};
1648
1649template <class _Fp, class ..._BoundArgs, class _TupleUj>
1650struct __bind_return<_Fp, const tuple<_BoundArgs...>, _TupleUj>
1651{
1652    typedef typename __invoke_of
1653    <
1654        _Fp&,
1655        typename __mu_return
1656        <
1657            const _BoundArgs,
1658            _TupleUj
1659        >::type...
1660    >::type type;
1661};
1662
1663template <class _Fp, class _BoundArgs, size_t ..._Indx, class _Args>
1664inline _LIBCPP_INLINE_VISIBILITY
1665typename __bind_return<_Fp, _BoundArgs, _Args>::type
1666__apply_functor(_Fp& __f, _BoundArgs& __bound_args, __tuple_indices<_Indx...>,
1667                _Args&& __args)
1668{
1669    return __invoke(__f, __mu(get<_Indx>(__bound_args), __args)...);
1670}
1671
1672template<class _Fp, class ..._BoundArgs>
1673class __bind
1674    : public __weak_result_type<typename decay<_Fp>::type>
1675{
1676    typedef typename decay<_Fp>::type _Fd;
1677    typedef tuple<typename decay<_BoundArgs>::type...> _Td;
1678    _Fd __f_;
1679    _Td __bound_args_;
1680
1681    typedef typename __make_tuple_indices<sizeof...(_BoundArgs)>::type __indices;
1682public:
1683#ifdef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
1684
1685    _LIBCPP_INLINE_VISIBILITY
1686    __bind(const __bind& __b)
1687        : __f_(__b.__f_),
1688          __bound_args_(__b.__bound_args_) {}
1689
1690    _LIBCPP_INLINE_VISIBILITY
1691    __bind& operator=(const __bind& __b)
1692    {
1693        __f_ = __b.__f_;
1694        __bound_args_ = __b.__bound_args_;
1695        return *this;
1696    }
1697
1698    _LIBCPP_INLINE_VISIBILITY
1699    __bind(__bind&& __b)
1700        : __f_(_VSTD::move(__b.__f_)),
1701          __bound_args_(_VSTD::move(__b.__bound_args_)) {}
1702
1703    _LIBCPP_INLINE_VISIBILITY
1704    __bind& operator=(__bind&& __b)
1705    {
1706        __f_ = _VSTD::move(__b.__f_);
1707        __bound_args_ = _VSTD::move(__b.__bound_args_);
1708        return *this;
1709    }
1710
1711#endif  // _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
1712
1713    template <class _Gp, class ..._BA,
1714              class = typename enable_if
1715                               <
1716                                  is_constructible<_Fd, _Gp>::value
1717                               >::type>
1718      _LIBCPP_INLINE_VISIBILITY
1719      explicit __bind(_Gp&& __f, _BA&& ...__bound_args)
1720        : __f_(_VSTD::forward<_Gp>(__f)),
1721          __bound_args_(_VSTD::forward<_BA>(__bound_args)...) {}
1722
1723    template <class ..._Args>
1724        _LIBCPP_INLINE_VISIBILITY
1725        typename __bind_return<_Fd, _Td, tuple<_Args&&...> >::type
1726        operator()(_Args&& ...__args)
1727        {
1728            return __apply_functor(__f_, __bound_args_, __indices(),
1729                                  tuple<_Args&&...>(_VSTD::forward<_Args>(__args)...));
1730        }
1731
1732    template <class ..._Args>
1733        _LIBCPP_INLINE_VISIBILITY
1734        typename __bind_return<_Fd, _Td, tuple<_Args&&...> >::type
1735        operator()(_Args&& ...__args) const
1736        {
1737            return __apply_functor(__f_, __bound_args_, __indices(),
1738                                   tuple<_Args&&...>(_VSTD::forward<_Args>(__args)...));
1739        }
1740};
1741
1742template<class _Fp, class ..._BoundArgs>
1743struct __is_bind_expression<__bind<_Fp, _BoundArgs...> > : public true_type {};
1744
1745template<class _Rp, class _Fp, class ..._BoundArgs>
1746class __bind_r
1747    : public __bind<_Fp, _BoundArgs...>
1748{
1749    typedef __bind<_Fp, _BoundArgs...> base;
1750public:
1751    typedef _Rp result_type;
1752
1753#ifdef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
1754
1755    _LIBCPP_INLINE_VISIBILITY
1756    __bind_r(const __bind_r& __b)
1757        : base(_VSTD::forward<const base&>(__b)) {}
1758
1759    _LIBCPP_INLINE_VISIBILITY
1760    __bind_r& operator=(const __bind_r& __b)
1761    {
1762        base::operator=(_VSTD::forward<const base&>(__b));
1763        return *this;
1764    }
1765
1766    _LIBCPP_INLINE_VISIBILITY
1767    __bind_r(__bind_r&& __b)
1768        : base(_VSTD::forward<base>(__b)) {}
1769
1770    _LIBCPP_INLINE_VISIBILITY
1771    __bind_r& operator=(__bind_r&& __b)
1772    {
1773        base::operator=(_VSTD::forward<base>(__b));
1774        return *this;
1775    }
1776
1777#endif  // _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
1778
1779    template <class _Gp, class ..._BA>
1780      _LIBCPP_INLINE_VISIBILITY
1781      explicit __bind_r(_Gp&& __f, _BA&& ...__bound_args)
1782        : base(_VSTD::forward<_Gp>(__f),
1783               _VSTD::forward<_BA>(__bound_args)...) {}
1784
1785    template <class ..._Args>
1786        _LIBCPP_INLINE_VISIBILITY
1787        result_type
1788        operator()(_Args&& ...__args)
1789        {
1790            return base::operator()(_VSTD::forward<_Args>(__args)...);
1791        }
1792
1793    template <class ..._Args>
1794        _LIBCPP_INLINE_VISIBILITY
1795        result_type
1796        operator()(_Args&& ...__args) const
1797        {
1798            return base::operator()(_VSTD::forward<_Args>(__args)...);
1799        }
1800};
1801
1802template<class _Rp, class _Fp, class ..._BoundArgs>
1803struct __is_bind_expression<__bind_r<_Rp, _Fp, _BoundArgs...> > : public true_type {};
1804
1805template<class _Fp, class ..._BoundArgs>
1806inline _LIBCPP_INLINE_VISIBILITY
1807__bind<_Fp, _BoundArgs...>
1808bind(_Fp&& __f, _BoundArgs&&... __bound_args)
1809{
1810    typedef __bind<_Fp, _BoundArgs...> type;
1811    return type(_VSTD::forward<_Fp>(__f), _VSTD::forward<_BoundArgs>(__bound_args)...);
1812}
1813
1814template<class _Rp, class _Fp, class ..._BoundArgs>
1815inline _LIBCPP_INLINE_VISIBILITY
1816__bind_r<_Rp, _Fp, _BoundArgs...>
1817bind(_Fp&& __f, _BoundArgs&&... __bound_args)
1818{
1819    typedef __bind_r<_Rp, _Fp, _BoundArgs...> type;
1820    return type(_VSTD::forward<_Fp>(__f), _VSTD::forward<_BoundArgs>(__bound_args)...);
1821}
1822
1823#endif  // _LIBCPP_HAS_NO_VARIADICS
1824
1825template <>
1826struct _LIBCPP_VISIBLE hash<bool>
1827    : public unary_function<bool, size_t>
1828{
1829    _LIBCPP_INLINE_VISIBILITY
1830    size_t operator()(bool __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1831};
1832
1833template <>
1834struct _LIBCPP_VISIBLE hash<char>
1835    : public unary_function<char, size_t>
1836{
1837    _LIBCPP_INLINE_VISIBILITY
1838    size_t operator()(char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1839};
1840
1841template <>
1842struct _LIBCPP_VISIBLE hash<signed char>
1843    : public unary_function<signed char, size_t>
1844{
1845    _LIBCPP_INLINE_VISIBILITY
1846    size_t operator()(signed char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1847};
1848
1849template <>
1850struct _LIBCPP_VISIBLE hash<unsigned char>
1851    : public unary_function<unsigned char, size_t>
1852{
1853    _LIBCPP_INLINE_VISIBILITY
1854    size_t operator()(unsigned char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1855};
1856
1857#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
1858
1859template <>
1860struct _LIBCPP_VISIBLE hash<char16_t>
1861    : public unary_function<char16_t, size_t>
1862{
1863    _LIBCPP_INLINE_VISIBILITY
1864    size_t operator()(char16_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1865};
1866
1867template <>
1868struct _LIBCPP_VISIBLE hash<char32_t>
1869    : public unary_function<char32_t, size_t>
1870{
1871    _LIBCPP_INLINE_VISIBILITY
1872    size_t operator()(char32_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1873};
1874
1875#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
1876
1877template <>
1878struct _LIBCPP_VISIBLE hash<wchar_t>
1879    : public unary_function<wchar_t, size_t>
1880{
1881    _LIBCPP_INLINE_VISIBILITY
1882    size_t operator()(wchar_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1883};
1884
1885template <>
1886struct _LIBCPP_VISIBLE hash<short>
1887    : public unary_function<short, size_t>
1888{
1889    _LIBCPP_INLINE_VISIBILITY
1890    size_t operator()(short __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1891};
1892
1893template <>
1894struct _LIBCPP_VISIBLE hash<unsigned short>
1895    : public unary_function<unsigned short, size_t>
1896{
1897    _LIBCPP_INLINE_VISIBILITY
1898    size_t operator()(unsigned short __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1899};
1900
1901template <>
1902struct _LIBCPP_VISIBLE hash<int>
1903    : public unary_function<int, size_t>
1904{
1905    _LIBCPP_INLINE_VISIBILITY
1906    size_t operator()(int __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1907};
1908
1909template <>
1910struct _LIBCPP_VISIBLE hash<unsigned int>
1911    : public unary_function<unsigned int, size_t>
1912{
1913    _LIBCPP_INLINE_VISIBILITY
1914    size_t operator()(unsigned int __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1915};
1916
1917template <>
1918struct _LIBCPP_VISIBLE hash<long>
1919    : public unary_function<long, size_t>
1920{
1921    _LIBCPP_INLINE_VISIBILITY
1922    size_t operator()(long __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1923};
1924
1925template <>
1926struct _LIBCPP_VISIBLE hash<unsigned long>
1927    : public unary_function<unsigned long, size_t>
1928{
1929    _LIBCPP_INLINE_VISIBILITY
1930    size_t operator()(unsigned long __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
1931};
1932
1933template <>
1934struct _LIBCPP_VISIBLE hash<long long>
1935    : public __scalar_hash<long long>
1936{
1937};
1938
1939template <>
1940struct _LIBCPP_VISIBLE hash<unsigned long long>
1941    : public __scalar_hash<unsigned long long>
1942{
1943};
1944
1945template <>
1946struct _LIBCPP_VISIBLE hash<float>
1947    : public __scalar_hash<float>
1948{
1949    _LIBCPP_INLINE_VISIBILITY
1950    size_t operator()(float __v) const _NOEXCEPT
1951    {
1952        // -0.0 and 0.0 should return same hash
1953       if (__v == 0)
1954           return 0;
1955        return __scalar_hash<float>::operator()(__v);
1956    }
1957};
1958
1959template <>
1960struct _LIBCPP_VISIBLE hash<double>
1961    : public __scalar_hash<double>
1962{
1963    _LIBCPP_INLINE_VISIBILITY
1964    size_t operator()(double __v) const _NOEXCEPT
1965    {
1966        // -0.0 and 0.0 should return same hash
1967       if (__v == 0)
1968           return 0;
1969        return __scalar_hash<double>::operator()(__v);
1970    }
1971};
1972
1973template <>
1974struct _LIBCPP_VISIBLE hash<long double>
1975    : public __scalar_hash<long double>
1976{
1977    _LIBCPP_INLINE_VISIBILITY
1978    size_t operator()(long double __v) const _NOEXCEPT
1979    {
1980        // -0.0 and 0.0 should return same hash
1981        if (__v == 0)
1982            return 0;
1983#if defined(__i386__)
1984        // Zero out padding bits
1985        union
1986        {
1987            long double __t;
1988            struct
1989            {
1990                size_t __a;
1991                size_t __b;
1992                size_t __c;
1993                size_t __d;
1994            };
1995        } __u;
1996        __u.__a = 0;
1997        __u.__b = 0;
1998        __u.__c = 0;
1999        __u.__d = 0;
2000        __u.__t = __v;
2001        return __u.__a ^ __u.__b ^ __u.__c ^ __u.__d;
2002#elif defined(__x86_64__)
2003        // Zero out padding bits
2004        union
2005        {
2006            long double __t;
2007            struct
2008            {
2009                size_t __a;
2010                size_t __b;
2011            };
2012        } __u;
2013        __u.__a = 0;
2014        __u.__b = 0;
2015        __u.__t = __v;
2016        return __u.__a ^ __u.__b;
2017#else
2018        return __scalar_hash<long double>::operator()(__v);
2019#endif
2020    }
2021};
2022
2023// struct hash<T*> in <memory>
2024
2025_LIBCPP_END_NAMESPACE_STD
2026
2027#endif  // _LIBCPP_FUNCTIONAL
2028