Home | History | Annotate | Download | only in include
      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 
     17 namespace std
     18 {
     19 
     20 template <class Arg, class Result>
     21 struct unary_function
     22 {
     23     typedef Arg    argument_type;
     24     typedef Result result_type;
     25 };
     26 
     27 template <class Arg1, class Arg2, class Result>
     28 struct binary_function
     29 {
     30     typedef Arg1   first_argument_type;
     31     typedef Arg2   second_argument_type;
     32     typedef Result result_type;
     33 };
     34 
     35 template <class T>
     36 class 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 {
     40 public:
     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 
     63 template <class T> reference_wrapper<T> ref(T& t) noexcept;
     64 template <class T> void ref(const T&& t) = delete;
     65 template <class T> reference_wrapper<T> ref(reference_wrapper<T>t) noexcept;
     66 
     67 template <class T> reference_wrapper<const T> cref(const T& t) noexcept;
     68 template <class T> void cref(const T&& t) = delete;
     69 template <class T> reference_wrapper<const T> cref(reference_wrapper<T> t) noexcept;
     70 
     71 template <class T> // <class T=void> in C++14
     72 struct plus : binary_function<T, T, T>
     73 {
     74     T operator()(const T& x, const T& y) const;
     75 };
     76 
     77 template <class T> // <class T=void> in C++14
     78 struct minus : binary_function<T, T, T>
     79 {
     80     T operator()(const T& x, const T& y) const;
     81 };
     82 
     83 template <class T> // <class T=void> in C++14
     84 struct multiplies : binary_function<T, T, T>
     85 {
     86     T operator()(const T& x, const T& y) const;
     87 };
     88 
     89 template <class T> // <class T=void> in C++14
     90 struct divides : binary_function<T, T, T>
     91 {
     92     T operator()(const T& x, const T& y) const;
     93 };
     94 
     95 template <class T> // <class T=void> in C++14
     96 struct modulus : binary_function<T, T, T>
     97 {
     98     T operator()(const T& x, const T& y) const;
     99 };
    100 
    101 template <class T> // <class T=void> in C++14
    102 struct negate : unary_function<T, T>
    103 {
    104     T operator()(const T& x) const;
    105 };
    106 
    107 template <class T> // <class T=void> in C++14
    108 struct equal_to : binary_function<T, T, bool>
    109 {
    110     bool operator()(const T& x, const T& y) const;
    111 };
    112 
    113 template <class T> // <class T=void> in C++14
    114 struct not_equal_to : binary_function<T, T, bool>
    115 {
    116     bool operator()(const T& x, const T& y) const;
    117 };
    118 
    119 template <class T> // <class T=void> in C++14
    120 struct greater : binary_function<T, T, bool>
    121 {
    122     bool operator()(const T& x, const T& y) const;
    123 };
    124 
    125 template <class T> // <class T=void> in C++14
    126 struct less : binary_function<T, T, bool>
    127 {
    128     bool operator()(const T& x, const T& y) const;
    129 };
    130 
    131 template <class T> // <class T=void> in C++14
    132 struct greater_equal : binary_function<T, T, bool>
    133 {
    134     bool operator()(const T& x, const T& y) const;
    135 };
    136 
    137 template <class T> // <class T=void> in C++14
    138 struct less_equal : binary_function<T, T, bool>
    139 {
    140     bool operator()(const T& x, const T& y) const;
    141 };
    142 
    143 template <class T> // <class T=void> in C++14
    144 struct logical_and : binary_function<T, T, bool>
    145 {
    146     bool operator()(const T& x, const T& y) const;
    147 };
    148 
    149 template <class T> // <class T=void> in C++14
    150 struct logical_or : binary_function<T, T, bool>
    151 {
    152     bool operator()(const T& x, const T& y) const;
    153 };
    154 
    155 template <class T> // <class T=void> in C++14
    156 struct logical_not : unary_function<T, bool>
    157 {
    158     bool operator()(const T& x) const;
    159 };
    160 
    161 template <class T> // <class T=void> in C++14
    162 struct bit_and : unary_function<T, bool>
    163 {
    164     bool operator()(const T& x, const T& y) const;
    165 };
    166 
    167 template <class T> // <class T=void> in C++14
    168 struct bit_or : unary_function<T, bool>
    169 {
    170     bool operator()(const T& x, const T& y) const;
    171 };
    172 
    173 template <class T> // <class T=void> in C++14
    174 struct bit_xor : unary_function<T, bool>
    175 {
    176     bool operator()(const T& x, const T& y) const;
    177 };
    178 
    179 template <class T=void> // C++14
    180 struct bit_xor : unary_function<T, bool>
    181 {
    182     bool operator()(const T& x) const;
    183 };
    184 
    185 template <class Predicate>
    186 class unary_negate
    187     : public unary_function<typename Predicate::argument_type, bool>
    188 {
    189 public:
    190     explicit unary_negate(const Predicate& pred);
    191     bool operator()(const typename Predicate::argument_type& x) const;
    192 };
    193 
    194 template <class Predicate> unary_negate<Predicate> not1(const Predicate& pred);
    195 
    196 template <class Predicate>
    197 class binary_negate
    198     : public binary_function<typename Predicate::first_argument_type,
    199                              typename Predicate::second_argument_type,
    200                              bool>
    201 {
    202 public:
    203     explicit binary_negate(const Predicate& pred);
    204     bool operator()(const typename Predicate::first_argument_type& x,
    205                     const typename Predicate::second_argument_type& y) const;
    206 };
    207 
    208 template <class Predicate> binary_negate<Predicate> not2(const Predicate& pred);
    209 
    210 template<class T> struct is_bind_expression;
    211 template<class T> struct is_placeholder;
    212 
    213 template<class Fn, class... BoundArgs>
    214   unspecified bind(Fn&&, BoundArgs&&...);
    215 template<class R, class Fn, class... BoundArgs>
    216   unspecified bind(Fn&&, BoundArgs&&...);
    217 
    218 namespace placeholders {
    219   // M is the implementation-defined number of placeholders
    220   extern unspecified _1;
    221   extern unspecified _2;
    222   .
    223   .
    224   .
    225   extern unspecified _Mp;
    226 }
    227 
    228 template <class Operation>
    229 class binder1st
    230     : public unary_function<typename Operation::second_argument_type,
    231                             typename Operation::result_type>
    232 {
    233 protected:
    234     Operation                               op;
    235     typename Operation::first_argument_type value;
    236 public:
    237     binder1st(const Operation& x, const typename Operation::first_argument_type y);
    238     typename Operation::result_type operator()(      typename Operation::second_argument_type& x) const;
    239     typename Operation::result_type operator()(const typename Operation::second_argument_type& x) const;
    240 };
    241 
    242 template <class Operation, class T>
    243 binder1st<Operation> bind1st(const Operation& op, const T& x);
    244 
    245 template <class Operation>
    246 class binder2nd
    247     : public unary_function<typename Operation::first_argument_type,
    248                             typename Operation::result_type>
    249 {
    250 protected:
    251     Operation                                op;
    252     typename Operation::second_argument_type value;
    253 public:
    254     binder2nd(const Operation& x, const typename Operation::second_argument_type y);
    255     typename Operation::result_type operator()(      typename Operation::first_argument_type& x) const;
    256     typename Operation::result_type operator()(const typename Operation::first_argument_type& x) const;
    257 };
    258 
    259 template <class Operation, class T>
    260 binder2nd<Operation> bind2nd(const Operation& op, const T& x);
    261 
    262 template <class Arg, class Result>
    263 class pointer_to_unary_function : public unary_function<Arg, Result>
    264 {
    265 public:
    266     explicit pointer_to_unary_function(Result (*f)(Arg));
    267     Result operator()(Arg x) const;
    268 };
    269 
    270 template <class Arg, class Result>
    271 pointer_to_unary_function<Arg,Result> ptr_fun(Result (*f)(Arg));
    272 
    273 template <class Arg1, class Arg2, class Result>
    274 class pointer_to_binary_function : public binary_function<Arg1, Arg2, Result>
    275 {
    276 public:
    277     explicit pointer_to_binary_function(Result (*f)(Arg1, Arg2));
    278     Result operator()(Arg1 x, Arg2 y) const;
    279 };
    280 
    281 template <class Arg1, class Arg2, class Result>
    282 pointer_to_binary_function<Arg1,Arg2,Result> ptr_fun(Result (*f)(Arg1,Arg2));
    283 
    284 template<class S, class T>
    285 class mem_fun_t : public unary_function<T*, S>
    286 {
    287 public:
    288     explicit mem_fun_t(S (T::*p)());
    289     S operator()(T* p) const;
    290 };
    291 
    292 template<class S, class T, class A>
    293 class mem_fun1_t : public binary_function<T*, A, S>
    294 {
    295 public:
    296     explicit mem_fun1_t(S (T::*p)(A));
    297     S operator()(T* p, A x) const;
    298 };
    299 
    300 template<class S, class T>          mem_fun_t<S,T>    mem_fun(S (T::*f)());
    301 template<class S, class T, class A> mem_fun1_t<S,T,A> mem_fun(S (T::*f)(A));
    302 
    303 template<class S, class T>
    304 class mem_fun_ref_t : public unary_function<T, S>
    305 {
    306 public:
    307     explicit mem_fun_ref_t(S (T::*p)());
    308     S operator()(T& p) const;
    309 };
    310 
    311 template<class S, class T, class A>
    312 class mem_fun1_ref_t : public binary_function<T, A, S>
    313 {
    314 public:
    315     explicit mem_fun1_ref_t(S (T::*p)(A));
    316     S operator()(T& p, A x) const;
    317 };
    318 
    319 template<class S, class T>          mem_fun_ref_t<S,T>    mem_fun_ref(S (T::*f)());
    320 template<class S, class T, class A> mem_fun1_ref_t<S,T,A> mem_fun_ref(S (T::*f)(A));
    321 
    322 template <class S, class T>
    323 class const_mem_fun_t : public unary_function<const T*, S>
    324 {
    325 public:
    326     explicit const_mem_fun_t(S (T::*p)() const);
    327     S operator()(const T* p) const;
    328 };
    329 
    330 template <class S, class T, class A>
    331 class const_mem_fun1_t : public binary_function<const T*, A, S>
    332 {
    333 public:
    334     explicit const_mem_fun1_t(S (T::*p)(A) const);
    335     S operator()(const T* p, A x) const;
    336 };
    337 
    338 template <class S, class T>          const_mem_fun_t<S,T>    mem_fun(S (T::*f)() const);
    339 template <class S, class T, class A> const_mem_fun1_t<S,T,A> mem_fun(S (T::*f)(A) const);
    340 
    341 template <class S, class T>
    342 class const_mem_fun_ref_t : public unary_function<T, S>
    343 {
    344 public:
    345     explicit const_mem_fun_ref_t(S (T::*p)() const);
    346     S operator()(const T& p) const;
    347 };
    348 
    349 template <class S, class T, class A>
    350 class const_mem_fun1_ref_t : public binary_function<T, A, S>
    351 {
    352 public:
    353     explicit const_mem_fun1_ref_t(S (T::*p)(A) const);
    354     S operator()(const T& p, A x) const;
    355 };
    356 
    357 template <class S, class T>          const_mem_fun_ref_t<S,T>    mem_fun_ref(S (T::*f)() const);
    358 template <class S, class T, class A> const_mem_fun1_ref_t<S,T,A> mem_fun_ref(S (T::*f)(A) const);
    359 
    360 template<class R, class T> unspecified mem_fn(R T::*);
    361 
    362 class bad_function_call
    363     : public exception
    364 {
    365 };
    366 
    367 template<class> class function; // undefined
    368 
    369 template<class R, class... ArgTypes>
    370 class function<R(ArgTypes...)>
    371   : public unary_function<T1, R>      // iff sizeof...(ArgTypes) == 1 and
    372                                       // ArgTypes contains T1
    373   : public binary_function<T1, T2, R> // iff sizeof...(ArgTypes) == 2 and
    374                                       // ArgTypes contains T1 and T2
    375 {
    376 public:
    377     typedef R result_type;
    378 
    379     // construct/copy/destroy:
    380     function() noexcept;
    381     function(nullptr_t) noexcept;
    382     function(const function&);
    383     function(function&&) noexcept;
    384     template<class F>
    385       function(F);
    386     template<Allocator Alloc>
    387       function(allocator_arg_t, const Alloc&) noexcept;
    388     template<Allocator Alloc>
    389       function(allocator_arg_t, const Alloc&, nullptr_t) noexcept;
    390     template<Allocator Alloc>
    391       function(allocator_arg_t, const Alloc&, const function&);
    392     template<Allocator Alloc>
    393       function(allocator_arg_t, const Alloc&, function&&);
    394     template<class F, Allocator Alloc>
    395       function(allocator_arg_t, const Alloc&, F);
    396 
    397     function& operator=(const function&);
    398     function& operator=(function&&) noexcept;
    399     function& operator=(nullptr_t) noexcept;
    400     template<class F>
    401       function& operator=(F&&);
    402     template<class F>
    403       function& operator=(reference_wrapper<F>) noexcept;
    404 
    405     ~function();
    406 
    407     // function modifiers:
    408     void swap(function&) noexcept;
    409     template<class F, class Alloc>
    410       void assign(F&&, const Alloc&);
    411 
    412     // function capacity:
    413     explicit operator bool() const noexcept;
    414 
    415     // function invocation:
    416     R operator()(ArgTypes...) const;
    417 
    418     // function target access:
    419     const std::type_info& target_type() const noexcept;
    420     template <typename T>       T* target() noexcept;
    421     template <typename T> const T* target() const noexcept;
    422 };
    423 
    424 // Null pointer comparisons:
    425 template <class R, class ... ArgTypes>
    426   bool operator==(const function<R(ArgTypes...)>&, nullptr_t) noexcept;
    427 
    428 template <class R, class ... ArgTypes>
    429   bool operator==(nullptr_t, const function<R(ArgTypes...)>&) noexcept;
    430 
    431 template <class R, class ... ArgTypes>
    432   bool operator!=(const function<R(ArgTypes...)>&, nullptr_t) noexcept;
    433 
    434 template <class  R, class ... ArgTypes>
    435   bool operator!=(nullptr_t, const function<R(ArgTypes...)>&) noexcept;
    436 
    437 // specialized algorithms:
    438 template <class  R, class ... ArgTypes>
    439   void swap(function<R(ArgTypes...)>&, function<R(ArgTypes...)>&) noexcept;
    440 
    441 template <class T> struct hash;
    442 
    443 template <> struct hash<bool>;
    444 template <> struct hash<char>;
    445 template <> struct hash<signed char>;
    446 template <> struct hash<unsigned char>;
    447 template <> struct hash<char16_t>;
    448 template <> struct hash<char32_t>;
    449 template <> struct hash<wchar_t>;
    450 template <> struct hash<short>;
    451 template <> struct hash<unsigned short>;
    452 template <> struct hash<int>;
    453 template <> struct hash<unsigned int>;
    454 template <> struct hash<long>;
    455 template <> struct hash<long long>;
    456 template <> struct hash<unsigned long>;
    457 template <> struct hash<unsigned long long>;
    458 
    459 template <> struct hash<float>;
    460 template <> struct hash<double>;
    461 template <> struct hash<long double>;
    462 
    463 template<class T> struct hash<T*>;
    464 
    465 }  // std
    466 
    467 POLICY:  For non-variadic implementations, the number of arguments is limited
    468          to 3.  It is hoped that the need for non-variadic implementations
    469          will be minimal.
    470 
    471 */
    472 
    473 #include <__config>
    474 #include <type_traits>
    475 #include <typeinfo>
    476 #include <exception>
    477 #include <memory>
    478 #include <tuple>
    479 
    480 #include <__functional_base>
    481 
    482 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
    483 #pragma GCC system_header
    484 #endif
    485 
    486 _LIBCPP_BEGIN_NAMESPACE_STD
    487 
    488 #if _LIBCPP_STD_VER > 11
    489 template <class _Tp = void>
    490 #else
    491 template <class _Tp>
    492 #endif
    493 struct _LIBCPP_TYPE_VIS_ONLY plus : binary_function<_Tp, _Tp, _Tp>
    494 {
    495     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    496     _Tp operator()(const _Tp& __x, const _Tp& __y) const
    497         {return __x + __y;}
    498 };
    499 
    500 #if _LIBCPP_STD_VER > 11
    501 template <>
    502 struct _LIBCPP_TYPE_VIS_ONLY plus<void>
    503 {
    504     template <class _T1, class _T2>
    505     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    506     auto operator()(_T1&& __t, _T2&& __u) const
    507         { return _VSTD::forward<_T1>(__t) + _VSTD::forward<_T2>(__u); }
    508     typedef void is_transparent;
    509 };
    510 #endif
    511 
    512 
    513 #if _LIBCPP_STD_VER > 11
    514 template <class _Tp = void>
    515 #else
    516 template <class _Tp>
    517 #endif
    518 struct _LIBCPP_TYPE_VIS_ONLY minus : binary_function<_Tp, _Tp, _Tp>
    519 {
    520     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    521     _Tp operator()(const _Tp& __x, const _Tp& __y) const
    522         {return __x - __y;}
    523 };
    524 
    525 #if _LIBCPP_STD_VER > 11
    526 template <>
    527 struct _LIBCPP_TYPE_VIS_ONLY minus<void>
    528 {
    529     template <class _T1, class _T2>
    530     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    531     auto operator()(_T1&& __t, _T2&& __u) const
    532         { return _VSTD::forward<_T1>(__t) - _VSTD::forward<_T2>(__u); }
    533     typedef void is_transparent;
    534 };
    535 #endif
    536 
    537 
    538 #if _LIBCPP_STD_VER > 11
    539 template <class _Tp = void>
    540 #else
    541 template <class _Tp>
    542 #endif
    543 struct _LIBCPP_TYPE_VIS_ONLY multiplies : binary_function<_Tp, _Tp, _Tp>
    544 {
    545     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    546     _Tp operator()(const _Tp& __x, const _Tp& __y) const
    547         {return __x * __y;}
    548 };
    549 
    550 #if _LIBCPP_STD_VER > 11
    551 template <>
    552 struct _LIBCPP_TYPE_VIS_ONLY multiplies<void>
    553 {
    554     template <class _T1, class _T2>
    555     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    556     auto operator()(_T1&& __t, _T2&& __u) const
    557         { return _VSTD::forward<_T1>(__t) * _VSTD::forward<_T2>(__u); }
    558     typedef void is_transparent;
    559 };
    560 #endif
    561 
    562 
    563 #if _LIBCPP_STD_VER > 11
    564 template <class _Tp = void>
    565 #else
    566 template <class _Tp>
    567 #endif
    568 struct _LIBCPP_TYPE_VIS_ONLY divides : binary_function<_Tp, _Tp, _Tp>
    569 {
    570     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    571     _Tp operator()(const _Tp& __x, const _Tp& __y) const
    572         {return __x / __y;}
    573 };
    574 
    575 #if _LIBCPP_STD_VER > 11
    576 template <>
    577 struct _LIBCPP_TYPE_VIS_ONLY divides<void>
    578 {
    579     template <class _T1, class _T2>
    580     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    581     auto operator()(_T1&& __t, _T2&& __u) const
    582         { return _VSTD::forward<_T1>(__t) / _VSTD::forward<_T2>(__u); }
    583     typedef void is_transparent;
    584 };
    585 #endif
    586 
    587 
    588 #if _LIBCPP_STD_VER > 11
    589 template <class _Tp = void>
    590 #else
    591 template <class _Tp>
    592 #endif
    593 struct _LIBCPP_TYPE_VIS_ONLY modulus : binary_function<_Tp, _Tp, _Tp>
    594 {
    595     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    596     _Tp operator()(const _Tp& __x, const _Tp& __y) const
    597         {return __x % __y;}
    598 };
    599 
    600 #if _LIBCPP_STD_VER > 11
    601 template <>
    602 struct _LIBCPP_TYPE_VIS_ONLY modulus<void>
    603 {
    604     template <class _T1, class _T2>
    605     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    606     auto operator()(_T1&& __t, _T2&& __u) const
    607         { return _VSTD::forward<_T1>(__t) % _VSTD::forward<_T2>(__u); }
    608     typedef void is_transparent;
    609 };
    610 #endif
    611 
    612 
    613 #if _LIBCPP_STD_VER > 11
    614 template <class _Tp = void>
    615 #else
    616 template <class _Tp>
    617 #endif
    618 struct _LIBCPP_TYPE_VIS_ONLY negate : unary_function<_Tp, _Tp>
    619 {
    620     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    621     _Tp operator()(const _Tp& __x) const
    622         {return -__x;}
    623 };
    624 
    625 #if _LIBCPP_STD_VER > 11
    626 template <>
    627 struct _LIBCPP_TYPE_VIS_ONLY negate<void>
    628 {
    629     template <class _Tp>
    630     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    631     auto operator()(_Tp&& __x) const
    632         { return -_VSTD::forward<_Tp>(__x); }
    633     typedef void is_transparent;
    634 };
    635 #endif
    636 
    637 
    638 #if _LIBCPP_STD_VER > 11
    639 template <class _Tp = void>
    640 #else
    641 template <class _Tp>
    642 #endif
    643 struct _LIBCPP_TYPE_VIS_ONLY equal_to : binary_function<_Tp, _Tp, bool>
    644 {
    645     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    646     bool operator()(const _Tp& __x, const _Tp& __y) const
    647         {return __x == __y;}
    648 };
    649 
    650 #if _LIBCPP_STD_VER > 11
    651 template <>
    652 struct _LIBCPP_TYPE_VIS_ONLY equal_to<void>
    653 {
    654     template <class _T1, class _T2>
    655     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    656     auto operator()(_T1&& __t, _T2&& __u) const
    657         { return _VSTD::forward<_T1>(__t) == _VSTD::forward<_T2>(__u); }
    658     typedef void is_transparent;
    659 };
    660 #endif
    661 
    662 
    663 #if _LIBCPP_STD_VER > 11
    664 template <class _Tp = void>
    665 #else
    666 template <class _Tp>
    667 #endif
    668 struct _LIBCPP_TYPE_VIS_ONLY not_equal_to : binary_function<_Tp, _Tp, bool>
    669 {
    670     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    671     bool operator()(const _Tp& __x, const _Tp& __y) const
    672         {return __x != __y;}
    673 };
    674 
    675 #if _LIBCPP_STD_VER > 11
    676 template <>
    677 struct _LIBCPP_TYPE_VIS_ONLY not_equal_to<void>
    678 {
    679     template <class _T1, class _T2>
    680     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    681     auto operator()(_T1&& __t, _T2&& __u) const
    682         { return _VSTD::forward<_T1>(__t) != _VSTD::forward<_T2>(__u); }
    683     typedef void is_transparent;
    684 };
    685 #endif
    686 
    687 
    688 #if _LIBCPP_STD_VER > 11
    689 template <class _Tp = void>
    690 #else
    691 template <class _Tp>
    692 #endif
    693 struct _LIBCPP_TYPE_VIS_ONLY greater : binary_function<_Tp, _Tp, bool>
    694 {
    695     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    696     bool operator()(const _Tp& __x, const _Tp& __y) const
    697         {return __x > __y;}
    698 };
    699 
    700 #if _LIBCPP_STD_VER > 11
    701 template <>
    702 struct _LIBCPP_TYPE_VIS_ONLY greater<void>
    703 {
    704     template <class _T1, class _T2>
    705     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    706     auto operator()(_T1&& __t, _T2&& __u) const
    707         { return _VSTD::forward<_T1>(__t) > _VSTD::forward<_T2>(__u); }
    708     typedef void is_transparent;
    709 };
    710 #endif
    711 
    712 
    713 // less in <__functional_base>
    714 
    715 #if _LIBCPP_STD_VER > 11
    716 template <class _Tp = void>
    717 #else
    718 template <class _Tp>
    719 #endif
    720 struct _LIBCPP_TYPE_VIS_ONLY greater_equal : binary_function<_Tp, _Tp, bool>
    721 {
    722     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    723     bool operator()(const _Tp& __x, const _Tp& __y) const
    724         {return __x >= __y;}
    725 };
    726 
    727 #if _LIBCPP_STD_VER > 11
    728 template <>
    729 struct _LIBCPP_TYPE_VIS_ONLY greater_equal<void>
    730 {
    731     template <class _T1, class _T2>
    732     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    733     auto operator()(_T1&& __t, _T2&& __u) const
    734         { return _VSTD::forward<_T1>(__t) >= _VSTD::forward<_T2>(__u); }
    735     typedef void is_transparent;
    736 };
    737 #endif
    738 
    739 
    740 #if _LIBCPP_STD_VER > 11
    741 template <class _Tp = void>
    742 #else
    743 template <class _Tp>
    744 #endif
    745 struct _LIBCPP_TYPE_VIS_ONLY less_equal : binary_function<_Tp, _Tp, bool>
    746 {
    747     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    748     bool operator()(const _Tp& __x, const _Tp& __y) const
    749         {return __x <= __y;}
    750 };
    751 
    752 #if _LIBCPP_STD_VER > 11
    753 template <>
    754 struct _LIBCPP_TYPE_VIS_ONLY less_equal<void>
    755 {
    756     template <class _T1, class _T2>
    757     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    758     auto operator()(_T1&& __t, _T2&& __u) const
    759         { return _VSTD::forward<_T1>(__t) <= _VSTD::forward<_T2>(__u); }
    760     typedef void is_transparent;
    761 };
    762 #endif
    763 
    764 
    765 #if _LIBCPP_STD_VER > 11
    766 template <class _Tp = void>
    767 #else
    768 template <class _Tp>
    769 #endif
    770 struct _LIBCPP_TYPE_VIS_ONLY logical_and : binary_function<_Tp, _Tp, bool>
    771 {
    772     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    773     bool operator()(const _Tp& __x, const _Tp& __y) const
    774         {return __x && __y;}
    775 };
    776 
    777 #if _LIBCPP_STD_VER > 11
    778 template <>
    779 struct _LIBCPP_TYPE_VIS_ONLY logical_and<void>
    780 {
    781     template <class _T1, class _T2>
    782     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    783     auto operator()(_T1&& __t, _T2&& __u) const
    784         { return _VSTD::forward<_T1>(__t) && _VSTD::forward<_T2>(__u); }
    785     typedef void is_transparent;
    786 };
    787 #endif
    788 
    789 
    790 #if _LIBCPP_STD_VER > 11
    791 template <class _Tp = void>
    792 #else
    793 template <class _Tp>
    794 #endif
    795 struct _LIBCPP_TYPE_VIS_ONLY logical_or : binary_function<_Tp, _Tp, bool>
    796 {
    797     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    798     bool operator()(const _Tp& __x, const _Tp& __y) const
    799         {return __x || __y;}
    800 };
    801 
    802 #if _LIBCPP_STD_VER > 11
    803 template <>
    804 struct _LIBCPP_TYPE_VIS_ONLY logical_or<void>
    805 {
    806     template <class _T1, class _T2>
    807     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    808     auto operator()(_T1&& __t, _T2&& __u) const
    809         { return _VSTD::forward<_T1>(__t) || _VSTD::forward<_T2>(__u); }
    810     typedef void is_transparent;
    811 };
    812 #endif
    813 
    814 
    815 #if _LIBCPP_STD_VER > 11
    816 template <class _Tp = void>
    817 #else
    818 template <class _Tp>
    819 #endif
    820 struct _LIBCPP_TYPE_VIS_ONLY logical_not : unary_function<_Tp, bool>
    821 {
    822     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    823     bool operator()(const _Tp& __x) const
    824         {return !__x;}
    825 };
    826 
    827 #if _LIBCPP_STD_VER > 11
    828 template <>
    829 struct _LIBCPP_TYPE_VIS_ONLY logical_not<void>
    830 {
    831     template <class _Tp>
    832     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    833     auto operator()(_Tp&& __x) const
    834         { return !_VSTD::forward<_Tp>(__x); }
    835     typedef void is_transparent;
    836 };
    837 #endif
    838 
    839 
    840 #if _LIBCPP_STD_VER > 11
    841 template <class _Tp = void>
    842 #else
    843 template <class _Tp>
    844 #endif
    845 struct _LIBCPP_TYPE_VIS_ONLY bit_and : binary_function<_Tp, _Tp, _Tp>
    846 {
    847     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    848     _Tp operator()(const _Tp& __x, const _Tp& __y) const
    849         {return __x & __y;}
    850 };
    851 
    852 #if _LIBCPP_STD_VER > 11
    853 template <>
    854 struct _LIBCPP_TYPE_VIS_ONLY bit_and<void>
    855 {
    856     template <class _T1, class _T2>
    857     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    858     auto operator()(_T1&& __t, _T2&& __u) const
    859         { return _VSTD::forward<_T1>(__t) & _VSTD::forward<_T2>(__u); }
    860     typedef void is_transparent;
    861 };
    862 #endif
    863 
    864 
    865 #if _LIBCPP_STD_VER > 11
    866 template <class _Tp = void>
    867 #else
    868 template <class _Tp>
    869 #endif
    870 struct _LIBCPP_TYPE_VIS_ONLY bit_or : binary_function<_Tp, _Tp, _Tp>
    871 {
    872     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    873     _Tp operator()(const _Tp& __x, const _Tp& __y) const
    874         {return __x | __y;}
    875 };
    876 
    877 #if _LIBCPP_STD_VER > 11
    878 template <>
    879 struct _LIBCPP_TYPE_VIS_ONLY bit_or<void>
    880 {
    881     template <class _T1, class _T2>
    882     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    883     auto operator()(_T1&& __t, _T2&& __u) const
    884         { return _VSTD::forward<_T1>(__t) | _VSTD::forward<_T2>(__u); }
    885     typedef void is_transparent;
    886 };
    887 #endif
    888 
    889 
    890 #if _LIBCPP_STD_VER > 11
    891 template <class _Tp = void>
    892 #else
    893 template <class _Tp>
    894 #endif
    895 struct _LIBCPP_TYPE_VIS_ONLY bit_xor : binary_function<_Tp, _Tp, _Tp>
    896 {
    897     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    898     _Tp operator()(const _Tp& __x, const _Tp& __y) const
    899         {return __x ^ __y;}
    900 };
    901 
    902 #if _LIBCPP_STD_VER > 11
    903 template <>
    904 struct _LIBCPP_TYPE_VIS_ONLY bit_xor<void>
    905 {
    906     template <class _T1, class _T2>
    907     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    908     auto operator()(_T1&& __t, _T2&& __u) const
    909         { return _VSTD::forward<_T1>(__t) ^ _VSTD::forward<_T2>(__u); }
    910     typedef void is_transparent;
    911 };
    912 #endif
    913 
    914 
    915 #if _LIBCPP_STD_VER > 11
    916 template <class _Tp = void>
    917 struct _LIBCPP_TYPE_VIS_ONLY bit_not : unary_function<_Tp, _Tp>
    918 {
    919     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    920     _Tp operator()(const _Tp& __x) const
    921         {return ~__x;}
    922 };
    923 
    924 template <>
    925 struct _LIBCPP_TYPE_VIS_ONLY bit_not<void>
    926 {
    927     template <class _Tp>
    928     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    929     auto operator()(_Tp&& __x) const
    930         { return ~_VSTD::forward<_Tp>(__x); }
    931     typedef void is_transparent;
    932 };
    933 #endif
    934 
    935 template <class _Predicate>
    936 class _LIBCPP_TYPE_VIS_ONLY unary_negate
    937     : public unary_function<typename _Predicate::argument_type, bool>
    938 {
    939     _Predicate __pred_;
    940 public:
    941     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    942     explicit unary_negate(const _Predicate& __pred)
    943         : __pred_(__pred) {}
    944     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    945     bool operator()(const typename _Predicate::argument_type& __x) const
    946         {return !__pred_(__x);}
    947 };
    948 
    949 template <class _Predicate>
    950 inline _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    951 unary_negate<_Predicate>
    952 not1(const _Predicate& __pred) {return unary_negate<_Predicate>(__pred);}
    953 
    954 template <class _Predicate>
    955 class _LIBCPP_TYPE_VIS_ONLY binary_negate
    956     : public binary_function<typename _Predicate::first_argument_type,
    957                              typename _Predicate::second_argument_type,
    958                              bool>
    959 {
    960     _Predicate __pred_;
    961 public:
    962     _LIBCPP_INLINE_VISIBILITY explicit _LIBCPP_CONSTEXPR_AFTER_CXX11 
    963     binary_negate(const _Predicate& __pred) : __pred_(__pred) {}
    964 
    965     _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    966     bool operator()(const typename _Predicate::first_argument_type& __x,
    967                     const typename _Predicate::second_argument_type& __y) const
    968         {return !__pred_(__x, __y);}
    969 };
    970 
    971 template <class _Predicate>
    972 inline _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
    973 binary_negate<_Predicate>
    974 not2(const _Predicate& __pred) {return binary_negate<_Predicate>(__pred);}
    975 
    976 template <class __Operation>
    977 class _LIBCPP_TYPE_VIS_ONLY binder1st
    978     : public unary_function<typename __Operation::second_argument_type,
    979                             typename __Operation::result_type>
    980 {
    981 protected:
    982     __Operation                               op;
    983     typename __Operation::first_argument_type value;
    984 public:
    985     _LIBCPP_INLINE_VISIBILITY binder1st(const __Operation& __x,
    986                                const typename __Operation::first_argument_type __y)
    987         : op(__x), value(__y) {}
    988     _LIBCPP_INLINE_VISIBILITY typename __Operation::result_type operator()
    989         (typename __Operation::second_argument_type& __x) const
    990             {return op(value, __x);}
    991     _LIBCPP_INLINE_VISIBILITY typename __Operation::result_type operator()
    992         (const typename __Operation::second_argument_type& __x) const
    993             {return op(value, __x);}
    994 };
    995 
    996 template <class __Operation, class _Tp>
    997 inline _LIBCPP_INLINE_VISIBILITY
    998 binder1st<__Operation>
    999 bind1st(const __Operation& __op, const _Tp& __x)
   1000     {return binder1st<__Operation>(__op, __x);}
   1001 
   1002 template <class __Operation>
   1003 class _LIBCPP_TYPE_VIS_ONLY binder2nd
   1004     : public unary_function<typename __Operation::first_argument_type,
   1005                             typename __Operation::result_type>
   1006 {
   1007 protected:
   1008     __Operation                                op;
   1009     typename __Operation::second_argument_type value;
   1010 public:
   1011     _LIBCPP_INLINE_VISIBILITY
   1012     binder2nd(const __Operation& __x, const typename __Operation::second_argument_type __y)
   1013         : op(__x), value(__y) {}
   1014     _LIBCPP_INLINE_VISIBILITY typename __Operation::result_type operator()
   1015         (      typename __Operation::first_argument_type& __x) const
   1016             {return op(__x, value);}
   1017     _LIBCPP_INLINE_VISIBILITY typename __Operation::result_type operator()
   1018         (const typename __Operation::first_argument_type& __x) const
   1019             {return op(__x, value);}
   1020 };
   1021 
   1022 template <class __Operation, class _Tp>
   1023 inline _LIBCPP_INLINE_VISIBILITY
   1024 binder2nd<__Operation>
   1025 bind2nd(const __Operation& __op, const _Tp& __x)
   1026     {return binder2nd<__Operation>(__op, __x);}
   1027 
   1028 template <class _Arg, class _Result>
   1029 class _LIBCPP_TYPE_VIS_ONLY pointer_to_unary_function
   1030     : public unary_function<_Arg, _Result>
   1031 {
   1032     _Result (*__f_)(_Arg);
   1033 public:
   1034     _LIBCPP_INLINE_VISIBILITY explicit pointer_to_unary_function(_Result (*__f)(_Arg))
   1035         : __f_(__f) {}
   1036     _LIBCPP_INLINE_VISIBILITY _Result operator()(_Arg __x) const
   1037         {return __f_(__x);}
   1038 };
   1039 
   1040 template <class _Arg, class _Result>
   1041 inline _LIBCPP_INLINE_VISIBILITY
   1042 pointer_to_unary_function<_Arg,_Result>
   1043 ptr_fun(_Result (*__f)(_Arg))
   1044     {return pointer_to_unary_function<_Arg,_Result>(__f);}
   1045 
   1046 template <class _Arg1, class _Arg2, class _Result>
   1047 class _LIBCPP_TYPE_VIS_ONLY pointer_to_binary_function
   1048     : public binary_function<_Arg1, _Arg2, _Result>
   1049 {
   1050     _Result (*__f_)(_Arg1, _Arg2);
   1051 public:
   1052     _LIBCPP_INLINE_VISIBILITY explicit pointer_to_binary_function(_Result (*__f)(_Arg1, _Arg2))
   1053         : __f_(__f) {}
   1054     _LIBCPP_INLINE_VISIBILITY _Result operator()(_Arg1 __x, _Arg2 __y) const
   1055         {return __f_(__x, __y);}
   1056 };
   1057 
   1058 template <class _Arg1, class _Arg2, class _Result>
   1059 inline _LIBCPP_INLINE_VISIBILITY
   1060 pointer_to_binary_function<_Arg1,_Arg2,_Result>
   1061 ptr_fun(_Result (*__f)(_Arg1,_Arg2))
   1062     {return pointer_to_binary_function<_Arg1,_Arg2,_Result>(__f);}
   1063 
   1064 template<class _Sp, class _Tp>
   1065 class _LIBCPP_TYPE_VIS_ONLY mem_fun_t : public unary_function<_Tp*, _Sp>
   1066 {
   1067     _Sp (_Tp::*__p_)();
   1068 public:
   1069     _LIBCPP_INLINE_VISIBILITY explicit mem_fun_t(_Sp (_Tp::*__p)())
   1070         : __p_(__p) {}
   1071     _LIBCPP_INLINE_VISIBILITY _Sp operator()(_Tp* __p) const
   1072         {return (__p->*__p_)();}
   1073 };
   1074 
   1075 template<class _Sp, class _Tp, class _Ap>
   1076 class _LIBCPP_TYPE_VIS_ONLY mem_fun1_t : public binary_function<_Tp*, _Ap, _Sp>
   1077 {
   1078     _Sp (_Tp::*__p_)(_Ap);
   1079 public:
   1080     _LIBCPP_INLINE_VISIBILITY explicit mem_fun1_t(_Sp (_Tp::*__p)(_Ap))
   1081         : __p_(__p) {}
   1082     _LIBCPP_INLINE_VISIBILITY _Sp operator()(_Tp* __p, _Ap __x) const
   1083         {return (__p->*__p_)(__x);}
   1084 };
   1085 
   1086 template<class _Sp, class _Tp>
   1087 inline _LIBCPP_INLINE_VISIBILITY
   1088 mem_fun_t<_Sp,_Tp>
   1089 mem_fun(_Sp (_Tp::*__f)())
   1090     {return mem_fun_t<_Sp,_Tp>(__f);}
   1091 
   1092 template<class _Sp, class _Tp, class _Ap>
   1093 inline _LIBCPP_INLINE_VISIBILITY
   1094 mem_fun1_t<_Sp,_Tp,_Ap>
   1095 mem_fun(_Sp (_Tp::*__f)(_Ap))
   1096     {return mem_fun1_t<_Sp,_Tp,_Ap>(__f);}
   1097 
   1098 template<class _Sp, class _Tp>
   1099 class _LIBCPP_TYPE_VIS_ONLY mem_fun_ref_t : public unary_function<_Tp, _Sp>
   1100 {
   1101     _Sp (_Tp::*__p_)();
   1102 public:
   1103     _LIBCPP_INLINE_VISIBILITY explicit mem_fun_ref_t(_Sp (_Tp::*__p)())
   1104         : __p_(__p) {}
   1105     _LIBCPP_INLINE_VISIBILITY _Sp operator()(_Tp& __p) const
   1106         {return (__p.*__p_)();}
   1107 };
   1108 
   1109 template<class _Sp, class _Tp, class _Ap>
   1110 class _LIBCPP_TYPE_VIS_ONLY mem_fun1_ref_t : public binary_function<_Tp, _Ap, _Sp>
   1111 {
   1112     _Sp (_Tp::*__p_)(_Ap);
   1113 public:
   1114     _LIBCPP_INLINE_VISIBILITY explicit mem_fun1_ref_t(_Sp (_Tp::*__p)(_Ap))
   1115         : __p_(__p) {}
   1116     _LIBCPP_INLINE_VISIBILITY _Sp operator()(_Tp& __p, _Ap __x) const
   1117         {return (__p.*__p_)(__x);}
   1118 };
   1119 
   1120 template<class _Sp, class _Tp>
   1121 inline _LIBCPP_INLINE_VISIBILITY
   1122 mem_fun_ref_t<_Sp,_Tp>
   1123 mem_fun_ref(_Sp (_Tp::*__f)())
   1124     {return mem_fun_ref_t<_Sp,_Tp>(__f);}
   1125 
   1126 template<class _Sp, class _Tp, class _Ap>
   1127 inline _LIBCPP_INLINE_VISIBILITY
   1128 mem_fun1_ref_t<_Sp,_Tp,_Ap>
   1129 mem_fun_ref(_Sp (_Tp::*__f)(_Ap))
   1130     {return mem_fun1_ref_t<_Sp,_Tp,_Ap>(__f);}
   1131 
   1132 template <class _Sp, class _Tp>
   1133 class _LIBCPP_TYPE_VIS_ONLY const_mem_fun_t : public unary_function<const _Tp*, _Sp>
   1134 {
   1135     _Sp (_Tp::*__p_)() const;
   1136 public:
   1137     _LIBCPP_INLINE_VISIBILITY explicit const_mem_fun_t(_Sp (_Tp::*__p)() const)
   1138         : __p_(__p) {}
   1139     _LIBCPP_INLINE_VISIBILITY _Sp operator()(const _Tp* __p) const
   1140         {return (__p->*__p_)();}
   1141 };
   1142 
   1143 template <class _Sp, class _Tp, class _Ap>
   1144 class _LIBCPP_TYPE_VIS_ONLY const_mem_fun1_t : public binary_function<const _Tp*, _Ap, _Sp>
   1145 {
   1146     _Sp (_Tp::*__p_)(_Ap) const;
   1147 public:
   1148     _LIBCPP_INLINE_VISIBILITY explicit const_mem_fun1_t(_Sp (_Tp::*__p)(_Ap) const)
   1149         : __p_(__p) {}
   1150     _LIBCPP_INLINE_VISIBILITY _Sp operator()(const _Tp* __p, _Ap __x) const
   1151         {return (__p->*__p_)(__x);}
   1152 };
   1153 
   1154 template <class _Sp, class _Tp>
   1155 inline _LIBCPP_INLINE_VISIBILITY
   1156 const_mem_fun_t<_Sp,_Tp>
   1157 mem_fun(_Sp (_Tp::*__f)() const)
   1158     {return const_mem_fun_t<_Sp,_Tp>(__f);}
   1159 
   1160 template <class _Sp, class _Tp, class _Ap>
   1161 inline _LIBCPP_INLINE_VISIBILITY
   1162 const_mem_fun1_t<_Sp,_Tp,_Ap>
   1163 mem_fun(_Sp (_Tp::*__f)(_Ap) const)
   1164     {return const_mem_fun1_t<_Sp,_Tp,_Ap>(__f);}
   1165 
   1166 template <class _Sp, class _Tp>
   1167 class _LIBCPP_TYPE_VIS_ONLY const_mem_fun_ref_t : public unary_function<_Tp, _Sp>
   1168 {
   1169     _Sp (_Tp::*__p_)() const;
   1170 public:
   1171     _LIBCPP_INLINE_VISIBILITY explicit const_mem_fun_ref_t(_Sp (_Tp::*__p)() const)
   1172         : __p_(__p) {}
   1173     _LIBCPP_INLINE_VISIBILITY _Sp operator()(const _Tp& __p) const
   1174         {return (__p.*__p_)();}
   1175 };
   1176 
   1177 template <class _Sp, class _Tp, class _Ap>
   1178 class _LIBCPP_TYPE_VIS_ONLY const_mem_fun1_ref_t
   1179     : public binary_function<_Tp, _Ap, _Sp>
   1180 {
   1181     _Sp (_Tp::*__p_)(_Ap) const;
   1182 public:
   1183     _LIBCPP_INLINE_VISIBILITY explicit const_mem_fun1_ref_t(_Sp (_Tp::*__p)(_Ap) const)
   1184         : __p_(__p) {}
   1185     _LIBCPP_INLINE_VISIBILITY _Sp operator()(const _Tp& __p, _Ap __x) const
   1186         {return (__p.*__p_)(__x);}
   1187 };
   1188 
   1189 template <class _Sp, class _Tp>
   1190 inline _LIBCPP_INLINE_VISIBILITY
   1191 const_mem_fun_ref_t<_Sp,_Tp>
   1192 mem_fun_ref(_Sp (_Tp::*__f)() const)
   1193     {return const_mem_fun_ref_t<_Sp,_Tp>(__f);}
   1194 
   1195 template <class _Sp, class _Tp, class _Ap>
   1196 inline _LIBCPP_INLINE_VISIBILITY
   1197 const_mem_fun1_ref_t<_Sp,_Tp,_Ap>
   1198 mem_fun_ref(_Sp (_Tp::*__f)(_Ap) const)
   1199     {return const_mem_fun1_ref_t<_Sp,_Tp,_Ap>(__f);}
   1200 
   1201 #ifdef _LIBCPP_HAS_NO_VARIADICS
   1202 
   1203 #include <__functional_03>
   1204 
   1205 #else  // _LIBCPP_HAS_NO_VARIADICS
   1206 
   1207 template <class _Tp>
   1208 class __mem_fn
   1209     : public __weak_result_type<_Tp>
   1210 {
   1211 public:
   1212     // types
   1213     typedef _Tp type;
   1214 private:
   1215     type __f_;
   1216 
   1217 public:
   1218     _LIBCPP_INLINE_VISIBILITY __mem_fn(type __f) : __f_(__f) {}
   1219 
   1220     // invoke
   1221     template <class... _ArgTypes>
   1222        _LIBCPP_INLINE_VISIBILITY
   1223        typename __invoke_return<type, _ArgTypes...>::type
   1224           operator() (_ArgTypes&&... __args) const
   1225           {
   1226               return __invoke(__f_, _VSTD::forward<_ArgTypes>(__args)...);
   1227           }
   1228 };
   1229 
   1230 template<class _Rp, class _Tp>
   1231 inline _LIBCPP_INLINE_VISIBILITY
   1232 __mem_fn<_Rp _Tp::*>
   1233 mem_fn(_Rp _Tp::* __pm)
   1234 {
   1235     return __mem_fn<_Rp _Tp::*>(__pm);
   1236 }
   1237 
   1238 // bad_function_call
   1239 
   1240 class _LIBCPP_EXCEPTION_ABI bad_function_call
   1241     : public exception
   1242 {
   1243 };
   1244 
   1245 template<class _Fp> class _LIBCPP_TYPE_VIS_ONLY function; // undefined
   1246 
   1247 namespace __function
   1248 {
   1249 
   1250 template<class _Rp, class ..._ArgTypes>
   1251 struct __maybe_derive_from_unary_function
   1252 {
   1253 };
   1254 
   1255 template<class _Rp, class _A1>
   1256 struct __maybe_derive_from_unary_function<_Rp(_A1)>
   1257     : public unary_function<_A1, _Rp>
   1258 {
   1259 };
   1260 
   1261 template<class _Rp, class ..._ArgTypes>
   1262 struct __maybe_derive_from_binary_function
   1263 {
   1264 };
   1265 
   1266 template<class _Rp, class _A1, class _A2>
   1267 struct __maybe_derive_from_binary_function<_Rp(_A1, _A2)>
   1268     : public binary_function<_A1, _A2, _Rp>
   1269 {
   1270 };
   1271 
   1272 template<class _Fp> class __base;
   1273 
   1274 template<class _Rp, class ..._ArgTypes>
   1275 class __base<_Rp(_ArgTypes...)>
   1276 {
   1277     __base(const __base&);
   1278     __base& operator=(const __base&);
   1279 public:
   1280     _LIBCPP_INLINE_VISIBILITY __base() {}
   1281     _LIBCPP_INLINE_VISIBILITY virtual ~__base() {}
   1282     virtual __base* __clone() const = 0;
   1283     virtual void __clone(__base*) const = 0;
   1284     virtual void destroy() _NOEXCEPT = 0;
   1285     virtual void destroy_deallocate() _NOEXCEPT = 0;
   1286     virtual _Rp operator()(_ArgTypes&& ...) = 0;
   1287 #ifndef _LIBCPP_NO_RTTI
   1288     virtual const void* target(const type_info&) const _NOEXCEPT = 0;
   1289     virtual const std::type_info& target_type() const _NOEXCEPT = 0;
   1290 #endif  // _LIBCPP_NO_RTTI
   1291 };
   1292 
   1293 template<class _FD, class _Alloc, class _FB> class __func;
   1294 
   1295 template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
   1296 class __func<_Fp, _Alloc, _Rp(_ArgTypes...)>
   1297     : public  __base<_Rp(_ArgTypes...)>
   1298 {
   1299     __compressed_pair<_Fp, _Alloc> __f_;
   1300 public:
   1301     _LIBCPP_INLINE_VISIBILITY
   1302     explicit __func(_Fp&& __f)
   1303         : __f_(piecewise_construct, _VSTD::forward_as_tuple(_VSTD::move(__f)),
   1304                                     _VSTD::forward_as_tuple()) {}
   1305     _LIBCPP_INLINE_VISIBILITY
   1306     explicit __func(const _Fp& __f, const _Alloc& __a)
   1307         : __f_(piecewise_construct, _VSTD::forward_as_tuple(__f),
   1308                                     _VSTD::forward_as_tuple(__a)) {}
   1309 
   1310     _LIBCPP_INLINE_VISIBILITY
   1311     explicit __func(const _Fp& __f, _Alloc&& __a)
   1312         : __f_(piecewise_construct, _VSTD::forward_as_tuple(__f),
   1313                                     _VSTD::forward_as_tuple(_VSTD::move(__a))) {}
   1314 
   1315     _LIBCPP_INLINE_VISIBILITY
   1316     explicit __func(_Fp&& __f, _Alloc&& __a)
   1317         : __f_(piecewise_construct, _VSTD::forward_as_tuple(_VSTD::move(__f)),
   1318                                     _VSTD::forward_as_tuple(_VSTD::move(__a))) {}
   1319     virtual __base<_Rp(_ArgTypes...)>* __clone() const;
   1320     virtual void __clone(__base<_Rp(_ArgTypes...)>*) const;
   1321     virtual void destroy() _NOEXCEPT;
   1322     virtual void destroy_deallocate() _NOEXCEPT;
   1323     virtual _Rp operator()(_ArgTypes&& ... __arg);
   1324 #ifndef _LIBCPP_NO_RTTI
   1325     virtual const void* target(const type_info&) const _NOEXCEPT;
   1326     virtual const std::type_info& target_type() const _NOEXCEPT;
   1327 #endif  // _LIBCPP_NO_RTTI
   1328 };
   1329 
   1330 template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
   1331 __base<_Rp(_ArgTypes...)>*
   1332 __func<_Fp, _Alloc, _Rp(_ArgTypes...)>::__clone() const
   1333 {
   1334     typedef typename _Alloc::template rebind<__func>::other _Ap;
   1335     _Ap __a(__f_.second());
   1336     typedef __allocator_destructor<_Ap> _Dp;
   1337     unique_ptr<__func, _Dp> __hold(__a.allocate(1), _Dp(__a, 1));
   1338     ::new (__hold.get()) __func(__f_.first(), _Alloc(__a));
   1339     return __hold.release();
   1340 }
   1341 
   1342 template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
   1343 void
   1344 __func<_Fp, _Alloc, _Rp(_ArgTypes...)>::__clone(__base<_Rp(_ArgTypes...)>* __p) const
   1345 {
   1346     ::new (__p) __func(__f_.first(), __f_.second());
   1347 }
   1348 
   1349 template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
   1350 void
   1351 __func<_Fp, _Alloc, _Rp(_ArgTypes...)>::destroy() _NOEXCEPT
   1352 {
   1353     __f_.~__compressed_pair<_Fp, _Alloc>();
   1354 }
   1355 
   1356 template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
   1357 void
   1358 __func<_Fp, _Alloc, _Rp(_ArgTypes...)>::destroy_deallocate() _NOEXCEPT
   1359 {
   1360     typedef typename _Alloc::template rebind<__func>::other _Ap;
   1361     _Ap __a(__f_.second());
   1362     __f_.~__compressed_pair<_Fp, _Alloc>();
   1363     __a.deallocate(this, 1);
   1364 }
   1365 
   1366 template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
   1367 _Rp
   1368 __func<_Fp, _Alloc, _Rp(_ArgTypes...)>::operator()(_ArgTypes&& ... __arg)
   1369 {
   1370     return __invoke(__f_.first(), _VSTD::forward<_ArgTypes>(__arg)...);
   1371 }
   1372 
   1373 #ifndef _LIBCPP_NO_RTTI
   1374 
   1375 template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
   1376 const void*
   1377 __func<_Fp, _Alloc, _Rp(_ArgTypes...)>::target(const type_info& __ti) const _NOEXCEPT
   1378 {
   1379     if (__ti == typeid(_Fp))
   1380         return &__f_.first();
   1381     return (const void*)0;
   1382 }
   1383 
   1384 template<class _Fp, class _Alloc, class _Rp, class ..._ArgTypes>
   1385 const std::type_info&
   1386 __func<_Fp, _Alloc, _Rp(_ArgTypes...)>::target_type() const _NOEXCEPT
   1387 {
   1388     return typeid(_Fp);
   1389 }
   1390 
   1391 #endif  // _LIBCPP_NO_RTTI
   1392 
   1393 }  // __function
   1394 
   1395 template<class _Rp, class ..._ArgTypes>
   1396 class _LIBCPP_TYPE_VIS_ONLY function<_Rp(_ArgTypes...)>
   1397     : public __function::__maybe_derive_from_unary_function<_Rp(_ArgTypes...)>,
   1398       public __function::__maybe_derive_from_binary_function<_Rp(_ArgTypes...)>
   1399 {
   1400     typedef __function::__base<_Rp(_ArgTypes...)> __base;
   1401     typename aligned_storage<3*sizeof(void*)>::type __buf_;
   1402     __base* __f_;
   1403 
   1404     template <class _Fp>
   1405         _LIBCPP_INLINE_VISIBILITY
   1406         static bool __not_null(const _Fp&) {return true;}
   1407     template <class _R2, class ..._Ap>
   1408         _LIBCPP_INLINE_VISIBILITY
   1409         static bool __not_null(_R2 (*__p)(_Ap...)) {return __p;}
   1410     template <class _R2, class _Cp, class ..._Ap>
   1411         _LIBCPP_INLINE_VISIBILITY
   1412         static bool __not_null(_R2 (_Cp::*__p)(_Ap...)) {return __p;}
   1413     template <class _R2, class _Cp, class ..._Ap>
   1414         _LIBCPP_INLINE_VISIBILITY
   1415         static bool __not_null(_R2 (_Cp::*__p)(_Ap...) const) {return __p;}
   1416     template <class _R2, class _Cp, class ..._Ap>
   1417         _LIBCPP_INLINE_VISIBILITY
   1418         static bool __not_null(_R2 (_Cp::*__p)(_Ap...) volatile) {return __p;}
   1419     template <class _R2, class _Cp, class ..._Ap>
   1420         _LIBCPP_INLINE_VISIBILITY
   1421         static bool __not_null(_R2 (_Cp::*__p)(_Ap...) const volatile) {return __p;}
   1422     template <class _R2, class ..._Ap>
   1423         _LIBCPP_INLINE_VISIBILITY
   1424         static bool __not_null(const function<_Rp(_Ap...)>& __p) {return __p;}
   1425 
   1426     template <class _Fp, bool = !is_same<_Fp, function>::value &&
   1427                                 __invokable<_Fp&, _ArgTypes...>::value>
   1428         struct __callable;
   1429     template <class _Fp>
   1430         struct __callable<_Fp, true>
   1431         {
   1432             static const bool value =
   1433                 is_convertible<typename __invoke_of<_Fp&, _ArgTypes...>::type,
   1434                                _Rp>::value;
   1435         };
   1436     template <class _Fp>
   1437         struct __callable<_Fp, false>
   1438         {
   1439             static const bool value = false;
   1440         };
   1441 public:
   1442     typedef _Rp result_type;
   1443 
   1444     // construct/copy/destroy:
   1445     _LIBCPP_INLINE_VISIBILITY
   1446     function() _NOEXCEPT : __f_(0) {}
   1447     _LIBCPP_INLINE_VISIBILITY
   1448     function(nullptr_t) _NOEXCEPT : __f_(0) {}
   1449     function(const function&);
   1450     function(function&&) _NOEXCEPT;
   1451     template<class _Fp>
   1452       function(_Fp, typename enable_if
   1453                                      <
   1454                                         __callable<_Fp>::value &&
   1455                                         !is_same<_Fp, function>::value
   1456                                       >::type* = 0);
   1457 
   1458     template<class _Alloc>
   1459       _LIBCPP_INLINE_VISIBILITY
   1460       function(allocator_arg_t, const _Alloc&) _NOEXCEPT : __f_(0) {}
   1461     template<class _Alloc>
   1462       _LIBCPP_INLINE_VISIBILITY
   1463       function(allocator_arg_t, const _Alloc&, nullptr_t) _NOEXCEPT : __f_(0) {}
   1464     template<class _Alloc>
   1465       function(allocator_arg_t, const _Alloc&, const function&);
   1466     template<class _Alloc>
   1467       function(allocator_arg_t, const _Alloc&, function&&);
   1468     template<class _Fp, class _Alloc>
   1469       function(allocator_arg_t, const _Alloc& __a, _Fp __f,
   1470                typename enable_if<__callable<_Fp>::value>::type* = 0);
   1471 
   1472     function& operator=(const function&);
   1473     function& operator=(function&&) _NOEXCEPT;
   1474     function& operator=(nullptr_t) _NOEXCEPT;
   1475     template<class _Fp>
   1476       typename enable_if
   1477       <
   1478         __callable<typename decay<_Fp>::type>::value &&
   1479         !is_same<typename remove_reference<_Fp>::type, function>::value,
   1480         function&
   1481       >::type
   1482       operator=(_Fp&&);
   1483 
   1484     ~function();
   1485 
   1486     // function modifiers:
   1487     void swap(function&) _NOEXCEPT;
   1488     template<class _Fp, class _Alloc>
   1489       _LIBCPP_INLINE_VISIBILITY
   1490       void assign(_Fp&& __f, const _Alloc& __a)
   1491         {function(allocator_arg, __a, _VSTD::forward<_Fp>(__f)).swap(*this);}
   1492 
   1493     // function capacity:
   1494     _LIBCPP_INLINE_VISIBILITY
   1495         _LIBCPP_EXPLICIT operator bool() const _NOEXCEPT {return __f_;}
   1496 
   1497     // deleted overloads close possible hole in the type system
   1498     template<class _R2, class... _ArgTypes2>
   1499       bool operator==(const function<_R2(_ArgTypes2...)>&) const = delete;
   1500     template<class _R2, class... _ArgTypes2>
   1501       bool operator!=(const function<_R2(_ArgTypes2...)>&) const = delete;
   1502 public:
   1503     // function invocation:
   1504     _Rp operator()(_ArgTypes...) const;
   1505 
   1506 #ifndef _LIBCPP_NO_RTTI
   1507     // function target access:
   1508     const std::type_info& target_type() const _NOEXCEPT;
   1509     template <typename _Tp> _Tp* target() _NOEXCEPT;
   1510     template <typename _Tp> const _Tp* target() const _NOEXCEPT;
   1511 #endif  // _LIBCPP_NO_RTTI
   1512 };
   1513 
   1514 template<class _Rp, class ..._ArgTypes>
   1515 function<_Rp(_ArgTypes...)>::function(const function& __f)
   1516 {
   1517     if (__f.__f_ == 0)
   1518         __f_ = 0;
   1519     else if (__f.__f_ == (const __base*)&__f.__buf_)
   1520     {
   1521         __f_ = (__base*)&__buf_;
   1522         __f.__f_->__clone(__f_);
   1523     }
   1524     else
   1525         __f_ = __f.__f_->__clone();
   1526 }
   1527 
   1528 template<class _Rp, class ..._ArgTypes>
   1529 template <class _Alloc>
   1530 function<_Rp(_ArgTypes...)>::function(allocator_arg_t, const _Alloc&,
   1531                                      const function& __f)
   1532 {
   1533     if (__f.__f_ == 0)
   1534         __f_ = 0;
   1535     else if (__f.__f_ == (const __base*)&__f.__buf_)
   1536     {
   1537         __f_ = (__base*)&__buf_;
   1538         __f.__f_->__clone(__f_);
   1539     }
   1540     else
   1541         __f_ = __f.__f_->__clone();
   1542 }
   1543 
   1544 template<class _Rp, class ..._ArgTypes>
   1545 function<_Rp(_ArgTypes...)>::function(function&& __f) _NOEXCEPT
   1546 {
   1547     if (__f.__f_ == 0)
   1548         __f_ = 0;
   1549     else if (__f.__f_ == (__base*)&__f.__buf_)
   1550     {
   1551         __f_ = (__base*)&__buf_;
   1552         __f.__f_->__clone(__f_);
   1553     }
   1554     else
   1555     {
   1556         __f_ = __f.__f_;
   1557         __f.__f_ = 0;
   1558     }
   1559 }
   1560 
   1561 template<class _Rp, class ..._ArgTypes>
   1562 template <class _Alloc>
   1563 function<_Rp(_ArgTypes...)>::function(allocator_arg_t, const _Alloc&,
   1564                                      function&& __f)
   1565 {
   1566     if (__f.__f_ == 0)
   1567         __f_ = 0;
   1568     else if (__f.__f_ == (__base*)&__f.__buf_)
   1569     {
   1570         __f_ = (__base*)&__buf_;
   1571         __f.__f_->__clone(__f_);
   1572     }
   1573     else
   1574     {
   1575         __f_ = __f.__f_;
   1576         __f.__f_ = 0;
   1577     }
   1578 }
   1579 
   1580 template<class _Rp, class ..._ArgTypes>
   1581 template <class _Fp>
   1582 function<_Rp(_ArgTypes...)>::function(_Fp __f,
   1583                                      typename enable_if
   1584                                      <
   1585                                         __callable<_Fp>::value &&
   1586                                         !is_same<_Fp, function>::value
   1587                                      >::type*)
   1588     : __f_(0)
   1589 {
   1590     if (__not_null(__f))
   1591     {
   1592         typedef __function::__func<_Fp, allocator<_Fp>, _Rp(_ArgTypes...)> _FF;
   1593         if (sizeof(_FF) <= sizeof(__buf_) && is_nothrow_copy_constructible<_Fp>::value)
   1594         {
   1595             __f_ = (__base*)&__buf_;
   1596             ::new (__f_) _FF(_VSTD::move(__f));
   1597         }
   1598         else
   1599         {
   1600             typedef allocator<_FF> _Ap;
   1601             _Ap __a;
   1602             typedef __allocator_destructor<_Ap> _Dp;
   1603             unique_ptr<__base, _Dp> __hold(__a.allocate(1), _Dp(__a, 1));
   1604             ::new (__hold.get()) _FF(_VSTD::move(__f), allocator<_Fp>(__a));
   1605             __f_ = __hold.release();
   1606         }
   1607     }
   1608 }
   1609 
   1610 template<class _Rp, class ..._ArgTypes>
   1611 template <class _Fp, class _Alloc>
   1612 function<_Rp(_ArgTypes...)>::function(allocator_arg_t, const _Alloc& __a0, _Fp __f,
   1613                                      typename enable_if<__callable<_Fp>::value>::type*)
   1614     : __f_(0)
   1615 {
   1616     typedef allocator_traits<_Alloc> __alloc_traits;
   1617     if (__not_null(__f))
   1618     {
   1619         typedef __function::__func<_Fp, _Alloc, _Rp(_ArgTypes...)> _FF;
   1620         if (sizeof(_FF) <= sizeof(__buf_) && is_nothrow_copy_constructible<_Fp>::value)
   1621         {
   1622             __f_ = (__base*)&__buf_;
   1623             ::new (__f_) _FF(_VSTD::move(__f));
   1624         }
   1625         else
   1626         {
   1627             typedef typename __alloc_traits::template
   1628 #ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
   1629                 rebind_alloc<_FF>
   1630 #else
   1631                 rebind_alloc<_FF>::other
   1632 #endif
   1633                                                          _Ap;
   1634             _Ap __a(__a0);
   1635             typedef __allocator_destructor<_Ap> _Dp;
   1636             unique_ptr<__base, _Dp> __hold(__a.allocate(1), _Dp(__a, 1));
   1637             ::new (__hold.get()) _FF(_VSTD::move(__f), _Alloc(__a));
   1638             __f_ = __hold.release();
   1639         }
   1640     }
   1641 }
   1642 
   1643 template<class _Rp, class ..._ArgTypes>
   1644 function<_Rp(_ArgTypes...)>&
   1645 function<_Rp(_ArgTypes...)>::operator=(const function& __f)
   1646 {
   1647     function(__f).swap(*this);
   1648     return *this;
   1649 }
   1650 
   1651 template<class _Rp, class ..._ArgTypes>
   1652 function<_Rp(_ArgTypes...)>&
   1653 function<_Rp(_ArgTypes...)>::operator=(function&& __f) _NOEXCEPT
   1654 {
   1655     if (__f_ == (__base*)&__buf_)
   1656         __f_->destroy();
   1657     else if (__f_)
   1658         __f_->destroy_deallocate();
   1659     __f_ = 0;
   1660     if (__f.__f_ == 0)
   1661         __f_ = 0;
   1662     else if (__f.__f_ == (__base*)&__f.__buf_)
   1663     {
   1664         __f_ = (__base*)&__buf_;
   1665         __f.__f_->__clone(__f_);
   1666     }
   1667     else
   1668     {
   1669         __f_ = __f.__f_;
   1670         __f.__f_ = 0;
   1671     }
   1672     return *this;
   1673 }
   1674 
   1675 template<class _Rp, class ..._ArgTypes>
   1676 function<_Rp(_ArgTypes...)>&
   1677 function<_Rp(_ArgTypes...)>::operator=(nullptr_t) _NOEXCEPT
   1678 {
   1679     if (__f_ == (__base*)&__buf_)
   1680         __f_->destroy();
   1681     else if (__f_)
   1682         __f_->destroy_deallocate();
   1683     __f_ = 0;
   1684     return *this;
   1685 }
   1686 
   1687 template<class _Rp, class ..._ArgTypes>
   1688 template <class _Fp>
   1689 typename enable_if
   1690 <
   1691     function<_Rp(_ArgTypes...)>::template __callable<typename decay<_Fp>::type>::value &&
   1692     !is_same<typename remove_reference<_Fp>::type, function<_Rp(_ArgTypes...)>>::value,
   1693     function<_Rp(_ArgTypes...)>&
   1694 >::type
   1695 function<_Rp(_ArgTypes...)>::operator=(_Fp&& __f)
   1696 {
   1697     function(_VSTD::forward<_Fp>(__f)).swap(*this);
   1698     return *this;
   1699 }
   1700 
   1701 template<class _Rp, class ..._ArgTypes>
   1702 function<_Rp(_ArgTypes...)>::~function()
   1703 {
   1704     if (__f_ == (__base*)&__buf_)
   1705         __f_->destroy();
   1706     else if (__f_)
   1707         __f_->destroy_deallocate();
   1708 }
   1709 
   1710 template<class _Rp, class ..._ArgTypes>
   1711 void
   1712 function<_Rp(_ArgTypes...)>::swap(function& __f) _NOEXCEPT
   1713 {
   1714     if (__f_ == (__base*)&__buf_ && __f.__f_ == (__base*)&__f.__buf_)
   1715     {
   1716         typename aligned_storage<sizeof(__buf_)>::type __tempbuf;
   1717         __base* __t = (__base*)&__tempbuf;
   1718         __f_->__clone(__t);
   1719         __f_->destroy();
   1720         __f_ = 0;
   1721         __f.__f_->__clone((__base*)&__buf_);
   1722         __f.__f_->destroy();
   1723         __f.__f_ = 0;
   1724         __f_ = (__base*)&__buf_;
   1725         __t->__clone((__base*)&__f.__buf_);
   1726         __t->destroy();
   1727         __f.__f_ = (__base*)&__f.__buf_;
   1728     }
   1729     else if (__f_ == (__base*)&__buf_)
   1730     {
   1731         __f_->__clone((__base*)&__f.__buf_);
   1732         __f_->destroy();
   1733         __f_ = __f.__f_;
   1734         __f.__f_ = (__base*)&__f.__buf_;
   1735     }
   1736     else if (__f.__f_ == (__base*)&__f.__buf_)
   1737     {
   1738         __f.__f_->__clone((__base*)&__buf_);
   1739         __f.__f_->destroy();
   1740         __f.__f_ = __f_;
   1741         __f_ = (__base*)&__buf_;
   1742     }
   1743     else
   1744         _VSTD::swap(__f_, __f.__f_);
   1745 }
   1746 
   1747 template<class _Rp, class ..._ArgTypes>
   1748 _Rp
   1749 function<_Rp(_ArgTypes...)>::operator()(_ArgTypes... __arg) const
   1750 {
   1751 #ifndef _LIBCPP_NO_EXCEPTIONS
   1752     if (__f_ == 0)
   1753         throw bad_function_call();
   1754 #endif  // _LIBCPP_NO_EXCEPTIONS
   1755     return (*__f_)(_VSTD::forward<_ArgTypes>(__arg)...);
   1756 }
   1757 
   1758 #ifndef _LIBCPP_NO_RTTI
   1759 
   1760 template<class _Rp, class ..._ArgTypes>
   1761 const std::type_info&
   1762 function<_Rp(_ArgTypes...)>::target_type() const _NOEXCEPT
   1763 {
   1764     if (__f_ == 0)
   1765         return typeid(void);
   1766     return __f_->target_type();
   1767 }
   1768 
   1769 template<class _Rp, class ..._ArgTypes>
   1770 template <typename _Tp>
   1771 _Tp*
   1772 function<_Rp(_ArgTypes...)>::target() _NOEXCEPT
   1773 {
   1774     if (__f_ == 0)
   1775         return (_Tp*)0;
   1776     return (_Tp*)__f_->target(typeid(_Tp));
   1777 }
   1778 
   1779 template<class _Rp, class ..._ArgTypes>
   1780 template <typename _Tp>
   1781 const _Tp*
   1782 function<_Rp(_ArgTypes...)>::target() const _NOEXCEPT
   1783 {
   1784     if (__f_ == 0)
   1785         return (const _Tp*)0;
   1786     return (const _Tp*)__f_->target(typeid(_Tp));
   1787 }
   1788 
   1789 #endif  // _LIBCPP_NO_RTTI
   1790 
   1791 template <class _Rp, class... _ArgTypes>
   1792 inline _LIBCPP_INLINE_VISIBILITY
   1793 bool
   1794 operator==(const function<_Rp(_ArgTypes...)>& __f, nullptr_t) _NOEXCEPT {return !__f;}
   1795 
   1796 template <class _Rp, class... _ArgTypes>
   1797 inline _LIBCPP_INLINE_VISIBILITY
   1798 bool
   1799 operator==(nullptr_t, const function<_Rp(_ArgTypes...)>& __f) _NOEXCEPT {return !__f;}
   1800 
   1801 template <class _Rp, class... _ArgTypes>
   1802 inline _LIBCPP_INLINE_VISIBILITY
   1803 bool
   1804 operator!=(const function<_Rp(_ArgTypes...)>& __f, nullptr_t) _NOEXCEPT {return (bool)__f;}
   1805 
   1806 template <class _Rp, class... _ArgTypes>
   1807 inline _LIBCPP_INLINE_VISIBILITY
   1808 bool
   1809 operator!=(nullptr_t, const function<_Rp(_ArgTypes...)>& __f) _NOEXCEPT {return (bool)__f;}
   1810 
   1811 template <class _Rp, class... _ArgTypes>
   1812 inline _LIBCPP_INLINE_VISIBILITY
   1813 void
   1814 swap(function<_Rp(_ArgTypes...)>& __x, function<_Rp(_ArgTypes...)>& __y) _NOEXCEPT
   1815 {return __x.swap(__y);}
   1816 
   1817 template<class _Tp> struct __is_bind_expression : public false_type {};
   1818 template<class _Tp> struct _LIBCPP_TYPE_VIS_ONLY is_bind_expression
   1819     : public __is_bind_expression<typename remove_cv<_Tp>::type> {};
   1820 
   1821 template<class _Tp> struct __is_placeholder : public integral_constant<int, 0> {};
   1822 template<class _Tp> struct _LIBCPP_TYPE_VIS_ONLY is_placeholder
   1823     : public __is_placeholder<typename remove_cv<_Tp>::type> {};
   1824 
   1825 namespace placeholders
   1826 {
   1827 
   1828 template <int _Np> struct __ph {};
   1829 
   1830 _LIBCPP_FUNC_VIS extern __ph<1>   _1;
   1831 _LIBCPP_FUNC_VIS extern __ph<2>   _2;
   1832 _LIBCPP_FUNC_VIS extern __ph<3>   _3;
   1833 _LIBCPP_FUNC_VIS extern __ph<4>   _4;
   1834 _LIBCPP_FUNC_VIS extern __ph<5>   _5;
   1835 _LIBCPP_FUNC_VIS extern __ph<6>   _6;
   1836 _LIBCPP_FUNC_VIS extern __ph<7>   _7;
   1837 _LIBCPP_FUNC_VIS extern __ph<8>   _8;
   1838 _LIBCPP_FUNC_VIS extern __ph<9>   _9;
   1839 _LIBCPP_FUNC_VIS extern __ph<10> _10;
   1840 
   1841 }  // placeholders
   1842 
   1843 template<int _Np>
   1844 struct __is_placeholder<placeholders::__ph<_Np> >
   1845     : public integral_constant<int, _Np> {};
   1846 
   1847 template <class _Tp, class _Uj>
   1848 inline _LIBCPP_INLINE_VISIBILITY
   1849 _Tp&
   1850 __mu(reference_wrapper<_Tp> __t, _Uj&)
   1851 {
   1852     return __t.get();
   1853 }
   1854 
   1855 template <class _Ti, class ..._Uj, size_t ..._Indx>
   1856 inline _LIBCPP_INLINE_VISIBILITY
   1857 typename __invoke_of<_Ti&, _Uj...>::type
   1858 __mu_expand(_Ti& __ti, tuple<_Uj...>& __uj, __tuple_indices<_Indx...>)
   1859 {
   1860     return __ti(_VSTD::forward<_Uj>(get<_Indx>(__uj))...);
   1861 }
   1862 
   1863 template <class _Ti, class ..._Uj>
   1864 inline _LIBCPP_INLINE_VISIBILITY
   1865 typename enable_if
   1866 <
   1867     is_bind_expression<_Ti>::value,
   1868     typename __invoke_of<_Ti&, _Uj...>::type
   1869 >::type
   1870 __mu(_Ti& __ti, tuple<_Uj...>& __uj)
   1871 {
   1872     typedef typename __make_tuple_indices<sizeof...(_Uj)>::type __indices;
   1873     return  __mu_expand(__ti, __uj, __indices());
   1874 }
   1875 
   1876 template <bool IsPh, class _Ti, class _Uj>
   1877 struct __mu_return2 {};
   1878 
   1879 template <class _Ti, class _Uj>
   1880 struct __mu_return2<true, _Ti, _Uj>
   1881 {
   1882     typedef typename tuple_element<is_placeholder<_Ti>::value - 1, _Uj>::type type;
   1883 };
   1884 
   1885 template <class _Ti, class _Uj>
   1886 inline _LIBCPP_INLINE_VISIBILITY
   1887 typename enable_if
   1888 <
   1889     0 < is_placeholder<_Ti>::value,
   1890     typename __mu_return2<0 < is_placeholder<_Ti>::value, _Ti, _Uj>::type
   1891 >::type
   1892 __mu(_Ti&, _Uj& __uj)
   1893 {
   1894     const size_t _Indx = is_placeholder<_Ti>::value - 1;
   1895     return _VSTD::forward<typename tuple_element<_Indx, _Uj>::type>(get<_Indx>(__uj));
   1896 }
   1897 
   1898 template <class _Ti, class _Uj>
   1899 inline _LIBCPP_INLINE_VISIBILITY
   1900 typename enable_if
   1901 <
   1902     !is_bind_expression<_Ti>::value &&
   1903     is_placeholder<_Ti>::value == 0 &&
   1904     !__is_reference_wrapper<_Ti>::value,
   1905     _Ti&
   1906 >::type
   1907 __mu(_Ti& __ti, _Uj&)
   1908 {
   1909     return __ti;
   1910 }
   1911 
   1912 template <class _Ti, bool IsReferenceWrapper, bool IsBindEx, bool IsPh,
   1913           class _TupleUj>
   1914 struct ____mu_return;
   1915 
   1916 template <bool _Invokable, class _Ti, class ..._Uj>
   1917 struct ____mu_return_invokable  // false
   1918 {
   1919     typedef __nat type;
   1920 };
   1921 
   1922 template <class _Ti, class ..._Uj>
   1923 struct ____mu_return_invokable<true, _Ti, _Uj...>
   1924 {
   1925     typedef typename __invoke_of<_Ti&, _Uj...>::type type;
   1926 };
   1927 
   1928 template <class _Ti, class ..._Uj>
   1929 struct ____mu_return<_Ti, false, true, false, tuple<_Uj...> >
   1930     : public ____mu_return_invokable<__invokable<_Ti&, _Uj...>::value, _Ti, _Uj...>
   1931 {
   1932 };
   1933 
   1934 template <class _Ti, class _TupleUj>
   1935 struct ____mu_return<_Ti, false, false, true, _TupleUj>
   1936 {
   1937     typedef typename tuple_element<is_placeholder<_Ti>::value - 1,
   1938                                    _TupleUj>::type&& type;
   1939 };
   1940 
   1941 template <class _Ti, class _TupleUj>
   1942 struct ____mu_return<_Ti, true, false, false, _TupleUj>
   1943 {
   1944     typedef typename _Ti::type& type;
   1945 };
   1946 
   1947 template <class _Ti, class _TupleUj>
   1948 struct ____mu_return<_Ti, false, false, false, _TupleUj>
   1949 {
   1950     typedef _Ti& type;
   1951 };
   1952 
   1953 template <class _Ti, class _TupleUj>
   1954 struct __mu_return
   1955     : public ____mu_return<_Ti,
   1956                            __is_reference_wrapper<_Ti>::value,
   1957                            is_bind_expression<_Ti>::value,
   1958                            0 < is_placeholder<_Ti>::value &&
   1959                            is_placeholder<_Ti>::value <= tuple_size<_TupleUj>::value,
   1960                            _TupleUj>
   1961 {
   1962 };
   1963 
   1964 template <class _Fp, class _BoundArgs, class _TupleUj>
   1965 struct _is_valid_bind_return
   1966 {
   1967     static const bool value = false;
   1968 };
   1969 
   1970 template <class _Fp, class ..._BoundArgs, class _TupleUj>
   1971 struct _is_valid_bind_return<_Fp, tuple<_BoundArgs...>, _TupleUj>
   1972 {
   1973     static const bool value = __invokable<_Fp,
   1974                     typename __mu_return<_BoundArgs, _TupleUj>::type...>::value;
   1975 };
   1976 
   1977 template <class _Fp, class ..._BoundArgs, class _TupleUj>
   1978 struct _is_valid_bind_return<_Fp, const tuple<_BoundArgs...>, _TupleUj>
   1979 {
   1980     static const bool value = __invokable<_Fp,
   1981                     typename __mu_return<const _BoundArgs, _TupleUj>::type...>::value;
   1982 };
   1983 
   1984 template <class _Fp, class _BoundArgs, class _TupleUj,
   1985           bool = _is_valid_bind_return<_Fp, _BoundArgs, _TupleUj>::value>
   1986 struct __bind_return;
   1987 
   1988 template <class _Fp, class ..._BoundArgs, class _TupleUj>
   1989 struct __bind_return<_Fp, tuple<_BoundArgs...>, _TupleUj, true>
   1990 {
   1991     typedef typename __invoke_of
   1992     <
   1993         _Fp&,
   1994         typename __mu_return
   1995         <
   1996             _BoundArgs,
   1997             _TupleUj
   1998         >::type...
   1999     >::type type;
   2000 };
   2001 
   2002 template <class _Fp, class ..._BoundArgs, class _TupleUj>
   2003 struct __bind_return<_Fp, const tuple<_BoundArgs...>, _TupleUj, true>
   2004 {
   2005     typedef typename __invoke_of
   2006     <
   2007         _Fp&,
   2008         typename __mu_return
   2009         <
   2010             const _BoundArgs,
   2011             _TupleUj
   2012         >::type...
   2013     >::type type;
   2014 };
   2015 
   2016 template <class _Fp, class _BoundArgs, size_t ..._Indx, class _Args>
   2017 inline _LIBCPP_INLINE_VISIBILITY
   2018 typename __bind_return<_Fp, _BoundArgs, _Args>::type
   2019 __apply_functor(_Fp& __f, _BoundArgs& __bound_args, __tuple_indices<_Indx...>,
   2020                 _Args&& __args)
   2021 {
   2022     return __invoke(__f, __mu(get<_Indx>(__bound_args), __args)...);
   2023 }
   2024 
   2025 template<class _Fp, class ..._BoundArgs>
   2026 class __bind
   2027     : public __weak_result_type<typename decay<_Fp>::type>
   2028 {
   2029 protected:
   2030     typedef typename decay<_Fp>::type _Fd;
   2031     typedef tuple<typename decay<_BoundArgs>::type...> _Td;
   2032 private:
   2033     _Fd __f_;
   2034     _Td __bound_args_;
   2035 
   2036     typedef typename __make_tuple_indices<sizeof...(_BoundArgs)>::type __indices;
   2037 public:
   2038 #ifdef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
   2039 
   2040     _LIBCPP_INLINE_VISIBILITY
   2041     __bind(const __bind& __b)
   2042         : __f_(__b.__f_),
   2043           __bound_args_(__b.__bound_args_) {}
   2044 
   2045     _LIBCPP_INLINE_VISIBILITY
   2046     __bind& operator=(const __bind& __b)
   2047     {
   2048         __f_ = __b.__f_;
   2049         __bound_args_ = __b.__bound_args_;
   2050         return *this;
   2051     }
   2052 
   2053     _LIBCPP_INLINE_VISIBILITY
   2054     __bind(__bind&& __b)
   2055         : __f_(_VSTD::move(__b.__f_)),
   2056           __bound_args_(_VSTD::move(__b.__bound_args_)) {}
   2057 
   2058     _LIBCPP_INLINE_VISIBILITY
   2059     __bind& operator=(__bind&& __b)
   2060     {
   2061         __f_ = _VSTD::move(__b.__f_);
   2062         __bound_args_ = _VSTD::move(__b.__bound_args_);
   2063         return *this;
   2064     }
   2065 
   2066 #endif  // _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
   2067 
   2068     template <class _Gp, class ..._BA,
   2069               class = typename enable_if
   2070                                <
   2071                                   is_constructible<_Fd, _Gp>::value &&
   2072                                   !is_same<typename remove_reference<_Gp>::type,
   2073                                            __bind>::value
   2074                                >::type>
   2075       _LIBCPP_INLINE_VISIBILITY
   2076       explicit __bind(_Gp&& __f, _BA&& ...__bound_args)
   2077         : __f_(_VSTD::forward<_Gp>(__f)),
   2078           __bound_args_(_VSTD::forward<_BA>(__bound_args)...) {}
   2079 
   2080     template <class ..._Args>
   2081         _LIBCPP_INLINE_VISIBILITY
   2082         typename __bind_return<_Fd, _Td, tuple<_Args&&...> >::type
   2083         operator()(_Args&& ...__args)
   2084         {
   2085             return __apply_functor(__f_, __bound_args_, __indices(),
   2086                                   tuple<_Args&&...>(_VSTD::forward<_Args>(__args)...));
   2087         }
   2088 
   2089     template <class ..._Args>
   2090         _LIBCPP_INLINE_VISIBILITY
   2091         typename __bind_return<const _Fd, const _Td, tuple<_Args&&...> >::type
   2092         operator()(_Args&& ...__args) const
   2093         {
   2094             return __apply_functor(__f_, __bound_args_, __indices(),
   2095                                    tuple<_Args&&...>(_VSTD::forward<_Args>(__args)...));
   2096         }
   2097 };
   2098 
   2099 template<class _Fp, class ..._BoundArgs>
   2100 struct __is_bind_expression<__bind<_Fp, _BoundArgs...> > : public true_type {};
   2101 
   2102 template<class _Rp, class _Fp, class ..._BoundArgs>
   2103 class __bind_r
   2104     : public __bind<_Fp, _BoundArgs...>
   2105 {
   2106     typedef __bind<_Fp, _BoundArgs...> base;
   2107     typedef typename base::_Fd _Fd;
   2108     typedef typename base::_Td _Td;
   2109 public:
   2110     typedef _Rp result_type;
   2111 
   2112 #ifdef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
   2113 
   2114     _LIBCPP_INLINE_VISIBILITY
   2115     __bind_r(const __bind_r& __b)
   2116         : base(_VSTD::forward<const base&>(__b)) {}
   2117 
   2118     _LIBCPP_INLINE_VISIBILITY
   2119     __bind_r& operator=(const __bind_r& __b)
   2120     {
   2121         base::operator=(_VSTD::forward<const base&>(__b));
   2122         return *this;
   2123     }
   2124 
   2125     _LIBCPP_INLINE_VISIBILITY
   2126     __bind_r(__bind_r&& __b)
   2127         : base(_VSTD::forward<base>(__b)) {}
   2128 
   2129     _LIBCPP_INLINE_VISIBILITY
   2130     __bind_r& operator=(__bind_r&& __b)
   2131     {
   2132         base::operator=(_VSTD::forward<base>(__b));
   2133         return *this;
   2134     }
   2135 
   2136 #endif  // _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
   2137 
   2138     template <class _Gp, class ..._BA,
   2139               class = typename enable_if
   2140                                <
   2141                                   is_constructible<_Fd, _Gp>::value &&
   2142                                   !is_same<typename remove_reference<_Gp>::type,
   2143                                            __bind_r>::value
   2144                                >::type>
   2145       _LIBCPP_INLINE_VISIBILITY
   2146       explicit __bind_r(_Gp&& __f, _BA&& ...__bound_args)
   2147         : base(_VSTD::forward<_Gp>(__f),
   2148                _VSTD::forward<_BA>(__bound_args)...) {}
   2149 
   2150     template <class ..._Args>
   2151         _LIBCPP_INLINE_VISIBILITY
   2152         typename enable_if
   2153         <
   2154             is_convertible<typename __bind_return<_Fd, _Td, tuple<_Args&&...> >::type,
   2155                            result_type>::value,
   2156             result_type
   2157         >::type
   2158         operator()(_Args&& ...__args)
   2159         {
   2160             return base::operator()(_VSTD::forward<_Args>(__args)...);
   2161         }
   2162 
   2163     template <class ..._Args>
   2164         _LIBCPP_INLINE_VISIBILITY
   2165         typename enable_if
   2166         <
   2167             is_convertible<typename __bind_return<const _Fd, const _Td, tuple<_Args&&...> >::type,
   2168                            result_type>::value,
   2169             result_type
   2170         >::type
   2171         operator()(_Args&& ...__args) const
   2172         {
   2173             return base::operator()(_VSTD::forward<_Args>(__args)...);
   2174         }
   2175 };
   2176 
   2177 template<class _Rp, class _Fp, class ..._BoundArgs>
   2178 struct __is_bind_expression<__bind_r<_Rp, _Fp, _BoundArgs...> > : public true_type {};
   2179 
   2180 template<class _Fp, class ..._BoundArgs>
   2181 inline _LIBCPP_INLINE_VISIBILITY
   2182 __bind<_Fp, _BoundArgs...>
   2183 bind(_Fp&& __f, _BoundArgs&&... __bound_args)
   2184 {
   2185     typedef __bind<_Fp, _BoundArgs...> type;
   2186     return type(_VSTD::forward<_Fp>(__f), _VSTD::forward<_BoundArgs>(__bound_args)...);
   2187 }
   2188 
   2189 template<class _Rp, class _Fp, class ..._BoundArgs>
   2190 inline _LIBCPP_INLINE_VISIBILITY
   2191 __bind_r<_Rp, _Fp, _BoundArgs...>
   2192 bind(_Fp&& __f, _BoundArgs&&... __bound_args)
   2193 {
   2194     typedef __bind_r<_Rp, _Fp, _BoundArgs...> type;
   2195     return type(_VSTD::forward<_Fp>(__f), _VSTD::forward<_BoundArgs>(__bound_args)...);
   2196 }
   2197 
   2198 #endif  // _LIBCPP_HAS_NO_VARIADICS
   2199 
   2200 template <>
   2201 struct _LIBCPP_TYPE_VIS_ONLY hash<bool>
   2202     : public unary_function<bool, size_t>
   2203 {
   2204     _LIBCPP_INLINE_VISIBILITY
   2205     size_t operator()(bool __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
   2206 };
   2207 
   2208 template <>
   2209 struct _LIBCPP_TYPE_VIS_ONLY hash<char>
   2210     : public unary_function<char, size_t>
   2211 {
   2212     _LIBCPP_INLINE_VISIBILITY
   2213     size_t operator()(char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
   2214 };
   2215 
   2216 template <>
   2217 struct _LIBCPP_TYPE_VIS_ONLY hash<signed char>
   2218     : public unary_function<signed char, size_t>
   2219 {
   2220     _LIBCPP_INLINE_VISIBILITY
   2221     size_t operator()(signed char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
   2222 };
   2223 
   2224 template <>
   2225 struct _LIBCPP_TYPE_VIS_ONLY hash<unsigned char>
   2226     : public unary_function<unsigned char, size_t>
   2227 {
   2228     _LIBCPP_INLINE_VISIBILITY
   2229     size_t operator()(unsigned char __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
   2230 };
   2231 
   2232 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
   2233 
   2234 template <>
   2235 struct _LIBCPP_TYPE_VIS_ONLY hash<char16_t>
   2236     : public unary_function<char16_t, size_t>
   2237 {
   2238     _LIBCPP_INLINE_VISIBILITY
   2239     size_t operator()(char16_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
   2240 };
   2241 
   2242 template <>
   2243 struct _LIBCPP_TYPE_VIS_ONLY hash<char32_t>
   2244     : public unary_function<char32_t, size_t>
   2245 {
   2246     _LIBCPP_INLINE_VISIBILITY
   2247     size_t operator()(char32_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
   2248 };
   2249 
   2250 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
   2251 
   2252 template <>
   2253 struct _LIBCPP_TYPE_VIS_ONLY hash<wchar_t>
   2254     : public unary_function<wchar_t, size_t>
   2255 {
   2256     _LIBCPP_INLINE_VISIBILITY
   2257     size_t operator()(wchar_t __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
   2258 };
   2259 
   2260 template <>
   2261 struct _LIBCPP_TYPE_VIS_ONLY hash<short>
   2262     : public unary_function<short, size_t>
   2263 {
   2264     _LIBCPP_INLINE_VISIBILITY
   2265     size_t operator()(short __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
   2266 };
   2267 
   2268 template <>
   2269 struct _LIBCPP_TYPE_VIS_ONLY hash<unsigned short>
   2270     : public unary_function<unsigned short, size_t>
   2271 {
   2272     _LIBCPP_INLINE_VISIBILITY
   2273     size_t operator()(unsigned short __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
   2274 };
   2275 
   2276 template <>
   2277 struct _LIBCPP_TYPE_VIS_ONLY hash<int>
   2278     : public unary_function<int, size_t>
   2279 {
   2280     _LIBCPP_INLINE_VISIBILITY
   2281     size_t operator()(int __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
   2282 };
   2283 
   2284 template <>
   2285 struct _LIBCPP_TYPE_VIS_ONLY hash<unsigned int>
   2286     : public unary_function<unsigned int, size_t>
   2287 {
   2288     _LIBCPP_INLINE_VISIBILITY
   2289     size_t operator()(unsigned int __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
   2290 };
   2291 
   2292 template <>
   2293 struct _LIBCPP_TYPE_VIS_ONLY hash<long>
   2294     : public unary_function<long, size_t>
   2295 {
   2296     _LIBCPP_INLINE_VISIBILITY
   2297     size_t operator()(long __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
   2298 };
   2299 
   2300 template <>
   2301 struct _LIBCPP_TYPE_VIS_ONLY hash<unsigned long>
   2302     : public unary_function<unsigned long, size_t>
   2303 {
   2304     _LIBCPP_INLINE_VISIBILITY
   2305     size_t operator()(unsigned long __v) const _NOEXCEPT {return static_cast<size_t>(__v);}
   2306 };
   2307 
   2308 template <>
   2309 struct _LIBCPP_TYPE_VIS_ONLY hash<long long>
   2310     : public __scalar_hash<long long>
   2311 {
   2312 };
   2313 
   2314 template <>
   2315 struct _LIBCPP_TYPE_VIS_ONLY hash<unsigned long long>
   2316     : public __scalar_hash<unsigned long long>
   2317 {
   2318 };
   2319 
   2320 template <>
   2321 struct _LIBCPP_TYPE_VIS_ONLY hash<float>
   2322     : public __scalar_hash<float>
   2323 {
   2324     _LIBCPP_INLINE_VISIBILITY
   2325     size_t operator()(float __v) const _NOEXCEPT
   2326     {
   2327         // -0.0 and 0.0 should return same hash
   2328        if (__v == 0)
   2329            return 0;
   2330         return __scalar_hash<float>::operator()(__v);
   2331     }
   2332 };
   2333 
   2334 template <>
   2335 struct _LIBCPP_TYPE_VIS_ONLY hash<double>
   2336     : public __scalar_hash<double>
   2337 {
   2338     _LIBCPP_INLINE_VISIBILITY
   2339     size_t operator()(double __v) const _NOEXCEPT
   2340     {
   2341         // -0.0 and 0.0 should return same hash
   2342        if (__v == 0)
   2343            return 0;
   2344         return __scalar_hash<double>::operator()(__v);
   2345     }
   2346 };
   2347 
   2348 template <>
   2349 struct _LIBCPP_TYPE_VIS_ONLY hash<long double>
   2350     : public __scalar_hash<long double>
   2351 {
   2352     _LIBCPP_INLINE_VISIBILITY
   2353     size_t operator()(long double __v) const _NOEXCEPT
   2354     {
   2355         // -0.0 and 0.0 should return same hash
   2356         if (__v == 0)
   2357             return 0;
   2358 #if defined(__i386__)
   2359         // Zero out padding bits
   2360         union
   2361         {
   2362             long double __t;
   2363             struct
   2364             {
   2365                 size_t __a;
   2366                 size_t __b;
   2367                 size_t __c;
   2368                 size_t __d;
   2369             };
   2370         } __u;
   2371         __u.__a = 0;
   2372         __u.__b = 0;
   2373         __u.__c = 0;
   2374         __u.__d = 0;
   2375         __u.__t = __v;
   2376         return __u.__a ^ __u.__b ^ __u.__c ^ __u.__d;
   2377 #elif defined(__x86_64__)
   2378         // Zero out padding bits
   2379         union
   2380         {
   2381             long double __t;
   2382             struct
   2383             {
   2384                 size_t __a;
   2385                 size_t __b;
   2386             };
   2387         } __u;
   2388         __u.__a = 0;
   2389         __u.__b = 0;
   2390         __u.__t = __v;
   2391         return __u.__a ^ __u.__b;
   2392 #else
   2393         return __scalar_hash<long double>::operator()(__v);
   2394 #endif
   2395     }
   2396 };
   2397 
   2398 #if _LIBCPP_STD_VER > 11
   2399 template <class _Tp>
   2400 struct _LIBCPP_TYPE_VIS_ONLY hash
   2401     : public unary_function<_Tp, size_t>
   2402 {
   2403     static_assert(is_enum<_Tp>::value, "This hash only works for enumeration types");
   2404 
   2405     _LIBCPP_INLINE_VISIBILITY
   2406     size_t operator()(_Tp __v) const _NOEXCEPT
   2407     {
   2408         typedef typename underlying_type<_Tp>::type type;
   2409         return hash<type>{}(static_cast<type>(__v));
   2410     }
   2411 };
   2412 #endif
   2413 
   2414 // struct hash<T*> in <memory>
   2415 
   2416 _LIBCPP_END_NAMESPACE_STD
   2417 
   2418 #endif  // _LIBCPP_FUNCTIONAL
   2419