libstdc++
functional
Go to the documentation of this file.
1 // <functional> -*- C++ -*-
2 
3 // Copyright (C) 2001-2021 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10 
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
15 
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19 
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24 
25 /*
26  * Copyright (c) 1997
27  * Silicon Graphics Computer Systems, Inc.
28  *
29  * Permission to use, copy, modify, distribute and sell this software
30  * and its documentation for any purpose is hereby granted without fee,
31  * provided that the above copyright notice appear in all copies and
32  * that both that copyright notice and this permission notice appear
33  * in supporting documentation. Silicon Graphics makes no
34  * representations about the suitability of this software for any
35  * purpose. It is provided "as is" without express or implied warranty.
36  *
37  */
38 
39 /** @file include/functional
40  * This is a Standard C++ Library header.
41  */
42 
43 #ifndef _GLIBCXX_FUNCTIONAL
44 #define _GLIBCXX_FUNCTIONAL 1
45 
46 #pragma GCC system_header
47 
48 #include <bits/c++config.h>
49 #include <bits/stl_function.h>
50 
51 #if __cplusplus >= 201103L
52 
53 #include <new>
54 #include <tuple>
55 #include <type_traits>
56 #include <bits/functional_hash.h>
57 #include <bits/invoke.h>
58 #include <bits/refwrap.h> // std::reference_wrapper and _Mem_fn_traits
59 #include <bits/std_function.h> // std::function
60 #if __cplusplus > 201402L
61 # include <unordered_map>
62 # include <vector>
63 # include <array>
64 # include <utility>
65 # include <bits/stl_algo.h>
66 #endif
67 #if __cplusplus > 201703L
68 # include <bits/ranges_cmp.h>
69 # include <compare>
70 #endif
71 
72 #endif // C++11
73 
74 namespace std _GLIBCXX_VISIBILITY(default)
75 {
76 _GLIBCXX_BEGIN_NAMESPACE_VERSION
77 
78  /** @brief The type of placeholder objects defined by libstdc++.
79  * @ingroup binders
80  */
81  template<int _Num> struct _Placeholder { };
82 
83 #if __cplusplus >= 201103L
84 
85 #if __cplusplus >= 201703L
86 # define __cpp_lib_invoke 201411L
87 # if __cplusplus > 201703L
88 # define __cpp_lib_constexpr_functional 201907L
89 # endif
90 
91  /// Invoke a callable object.
92  template<typename _Callable, typename... _Args>
93  inline _GLIBCXX20_CONSTEXPR invoke_result_t<_Callable, _Args...>
94  invoke(_Callable&& __fn, _Args&&... __args)
95  noexcept(is_nothrow_invocable_v<_Callable, _Args...>)
96  {
97  return std::__invoke(std::forward<_Callable>(__fn),
98  std::forward<_Args>(__args)...);
99  }
100 #endif // C++17
101 
102  template<typename _MemFunPtr,
103  bool __is_mem_fn = is_member_function_pointer<_MemFunPtr>::value>
104  class _Mem_fn_base
105  : public _Mem_fn_traits<_MemFunPtr>::__maybe_type
106  {
107  using _Traits = _Mem_fn_traits<_MemFunPtr>;
108 
109  using _Arity = typename _Traits::__arity;
110  using _Varargs = typename _Traits::__vararg;
111 
112  template<typename _Func, typename... _BoundArgs>
113  friend struct _Bind_check_arity;
114 
115  _MemFunPtr _M_pmf;
116 
117  public:
118 
119  using result_type = typename _Traits::__result_type;
120 
121  explicit constexpr
122  _Mem_fn_base(_MemFunPtr __pmf) noexcept : _M_pmf(__pmf) { }
123 
124  template<typename... _Args>
125  _GLIBCXX20_CONSTEXPR
126  auto
127  operator()(_Args&&... __args) const
128  noexcept(noexcept(
129  std::__invoke(_M_pmf, std::forward<_Args>(__args)...)))
130  -> decltype(std::__invoke(_M_pmf, std::forward<_Args>(__args)...))
131  { return std::__invoke(_M_pmf, std::forward<_Args>(__args)...); }
132  };
133 
134  // Partial specialization for member object pointers.
135  template<typename _MemObjPtr>
136  class _Mem_fn_base<_MemObjPtr, false>
137  {
138  using _Arity = integral_constant<size_t, 0>;
139  using _Varargs = false_type;
140 
141  template<typename _Func, typename... _BoundArgs>
142  friend struct _Bind_check_arity;
143 
144  _MemObjPtr _M_pm;
145 
146  public:
147  explicit constexpr
148  _Mem_fn_base(_MemObjPtr __pm) noexcept : _M_pm(__pm) { }
149 
150  template<typename _Tp>
151  _GLIBCXX20_CONSTEXPR
152  auto
153  operator()(_Tp&& __obj) const
154  noexcept(noexcept(std::__invoke(_M_pm, std::forward<_Tp>(__obj))))
155  -> decltype(std::__invoke(_M_pm, std::forward<_Tp>(__obj)))
156  { return std::__invoke(_M_pm, std::forward<_Tp>(__obj)); }
157  };
158 
159  template<typename _MemberPointer>
160  struct _Mem_fn; // undefined
161 
162  template<typename _Res, typename _Class>
163  struct _Mem_fn<_Res _Class::*>
164  : _Mem_fn_base<_Res _Class::*>
165  {
166  using _Mem_fn_base<_Res _Class::*>::_Mem_fn_base;
167  };
168 
169  // _GLIBCXX_RESOLVE_LIB_DEFECTS
170  // 2048. Unnecessary mem_fn overloads
171  /**
172  * @brief Returns a function object that forwards to the member
173  * pointer @a pm.
174  * @ingroup functors
175  */
176  template<typename _Tp, typename _Class>
177  _GLIBCXX20_CONSTEXPR
178  inline _Mem_fn<_Tp _Class::*>
179  mem_fn(_Tp _Class::* __pm) noexcept
180  {
181  return _Mem_fn<_Tp _Class::*>(__pm);
182  }
183 
184  /**
185  * @brief Determines if the given type _Tp is a function object that
186  * should be treated as a subexpression when evaluating calls to
187  * function objects returned by bind().
188  *
189  * C++11 [func.bind.isbind].
190  * @ingroup binders
191  */
192  template<typename _Tp>
194  : public false_type { };
195 
196  /**
197  * @brief Determines if the given type _Tp is a placeholder in a
198  * bind() expression and, if so, which placeholder it is.
199  *
200  * C++11 [func.bind.isplace].
201  * @ingroup binders
202  */
203  template<typename _Tp>
205  : public integral_constant<int, 0>
206  { };
207 
208 #if __cplusplus > 201402L
209  template <typename _Tp> inline constexpr bool is_bind_expression_v
211  template <typename _Tp> inline constexpr int is_placeholder_v
213 #endif // C++17
214 
215  /** @namespace std::placeholders
216  * @brief ISO C++ 2011 namespace for std::bind placeholders.
217  * @ingroup binders
218  */
219  namespace placeholders
220  {
221  /* Define a large number of placeholders. There is no way to
222  * simplify this with variadic templates, because we're introducing
223  * unique names for each.
224  */
225  extern const _Placeholder<1> _1;
226  extern const _Placeholder<2> _2;
227  extern const _Placeholder<3> _3;
228  extern const _Placeholder<4> _4;
229  extern const _Placeholder<5> _5;
230  extern const _Placeholder<6> _6;
231  extern const _Placeholder<7> _7;
232  extern const _Placeholder<8> _8;
233  extern const _Placeholder<9> _9;
234  extern const _Placeholder<10> _10;
235  extern const _Placeholder<11> _11;
236  extern const _Placeholder<12> _12;
237  extern const _Placeholder<13> _13;
238  extern const _Placeholder<14> _14;
239  extern const _Placeholder<15> _15;
240  extern const _Placeholder<16> _16;
241  extern const _Placeholder<17> _17;
242  extern const _Placeholder<18> _18;
243  extern const _Placeholder<19> _19;
244  extern const _Placeholder<20> _20;
245  extern const _Placeholder<21> _21;
246  extern const _Placeholder<22> _22;
247  extern const _Placeholder<23> _23;
248  extern const _Placeholder<24> _24;
249  extern const _Placeholder<25> _25;
250  extern const _Placeholder<26> _26;
251  extern const _Placeholder<27> _27;
252  extern const _Placeholder<28> _28;
253  extern const _Placeholder<29> _29;
254  }
255 
256  /**
257  * Partial specialization of is_placeholder that provides the placeholder
258  * number for the placeholder objects defined by libstdc++.
259  * @ingroup binders
260  */
261  template<int _Num>
263  : public integral_constant<int, _Num>
264  { };
265 
266  template<int _Num>
267  struct is_placeholder<const _Placeholder<_Num> >
268  : public integral_constant<int, _Num>
269  { };
270 
271 
272  // Like tuple_element_t but SFINAE-friendly.
273  template<std::size_t __i, typename _Tuple>
274  using _Safe_tuple_element_t
275  = typename enable_if<(__i < tuple_size<_Tuple>::value),
276  tuple_element<__i, _Tuple>>::type::type;
277 
278  /**
279  * Maps an argument to bind() into an actual argument to the bound
280  * function object [func.bind.bind]/10. Only the first parameter should
281  * be specified: the rest are used to determine among the various
282  * implementations. Note that, although this class is a function
283  * object, it isn't entirely normal because it takes only two
284  * parameters regardless of the number of parameters passed to the
285  * bind expression. The first parameter is the bound argument and
286  * the second parameter is a tuple containing references to the
287  * rest of the arguments.
288  */
289  template<typename _Arg,
290  bool _IsBindExp = is_bind_expression<_Arg>::value,
291  bool _IsPlaceholder = (is_placeholder<_Arg>::value > 0)>
292  class _Mu;
293 
294  /**
295  * If the argument is reference_wrapper<_Tp>, returns the
296  * underlying reference.
297  * C++11 [func.bind.bind] p10 bullet 1.
298  */
299  template<typename _Tp>
300  class _Mu<reference_wrapper<_Tp>, false, false>
301  {
302  public:
303  /* Note: This won't actually work for const volatile
304  * reference_wrappers, because reference_wrapper::get() is const
305  * but not volatile-qualified. This might be a defect in the TR.
306  */
307  template<typename _CVRef, typename _Tuple>
308  _GLIBCXX20_CONSTEXPR
309  _Tp&
310  operator()(_CVRef& __arg, _Tuple&) const volatile
311  { return __arg.get(); }
312  };
313 
314  /**
315  * If the argument is a bind expression, we invoke the underlying
316  * function object with the same cv-qualifiers as we are given and
317  * pass along all of our arguments (unwrapped).
318  * C++11 [func.bind.bind] p10 bullet 2.
319  */
320  template<typename _Arg>
321  class _Mu<_Arg, true, false>
322  {
323  public:
324  template<typename _CVArg, typename... _Args>
325  _GLIBCXX20_CONSTEXPR
326  auto
327  operator()(_CVArg& __arg,
328  tuple<_Args...>& __tuple) const volatile
329  -> decltype(__arg(declval<_Args>()...))
330  {
331  // Construct an index tuple and forward to __call
332  typedef typename _Build_index_tuple<sizeof...(_Args)>::__type
333  _Indexes;
334  return this->__call(__arg, __tuple, _Indexes());
335  }
336 
337  private:
338  // Invokes the underlying function object __arg by unpacking all
339  // of the arguments in the tuple.
340  template<typename _CVArg, typename... _Args, std::size_t... _Indexes>
341  _GLIBCXX20_CONSTEXPR
342  auto
343  __call(_CVArg& __arg, tuple<_Args...>& __tuple,
344  const _Index_tuple<_Indexes...>&) const volatile
345  -> decltype(__arg(declval<_Args>()...))
346  {
347  return __arg(std::get<_Indexes>(std::move(__tuple))...);
348  }
349  };
350 
351  /**
352  * If the argument is a placeholder for the Nth argument, returns
353  * a reference to the Nth argument to the bind function object.
354  * C++11 [func.bind.bind] p10 bullet 3.
355  */
356  template<typename _Arg>
357  class _Mu<_Arg, false, true>
358  {
359  public:
360  template<typename _Tuple>
361  _GLIBCXX20_CONSTEXPR
362  _Safe_tuple_element_t<(is_placeholder<_Arg>::value - 1), _Tuple>&&
363  operator()(const volatile _Arg&, _Tuple& __tuple) const volatile
364  {
365  return
366  ::std::get<(is_placeholder<_Arg>::value - 1)>(std::move(__tuple));
367  }
368  };
369 
370  /**
371  * If the argument is just a value, returns a reference to that
372  * value. The cv-qualifiers on the reference are determined by the caller.
373  * C++11 [func.bind.bind] p10 bullet 4.
374  */
375  template<typename _Arg>
376  class _Mu<_Arg, false, false>
377  {
378  public:
379  template<typename _CVArg, typename _Tuple>
380  _GLIBCXX20_CONSTEXPR
381  _CVArg&&
382  operator()(_CVArg&& __arg, _Tuple&) const volatile
383  { return std::forward<_CVArg>(__arg); }
384  };
385 
386  // std::get<I> for volatile-qualified tuples
387  template<std::size_t _Ind, typename... _Tp>
388  inline auto
389  __volget(volatile tuple<_Tp...>& __tuple)
390  -> __tuple_element_t<_Ind, tuple<_Tp...>> volatile&
391  { return std::get<_Ind>(const_cast<tuple<_Tp...>&>(__tuple)); }
392 
393  // std::get<I> for const-volatile-qualified tuples
394  template<std::size_t _Ind, typename... _Tp>
395  inline auto
396  __volget(const volatile tuple<_Tp...>& __tuple)
397  -> __tuple_element_t<_Ind, tuple<_Tp...>> const volatile&
398  { return std::get<_Ind>(const_cast<const tuple<_Tp...>&>(__tuple)); }
399 
400  /// Type of the function object returned from bind().
401  template<typename _Signature>
402  class _Bind;
403 
404  template<typename _Functor, typename... _Bound_args>
405  class _Bind<_Functor(_Bound_args...)>
406  : public _Weak_result_type<_Functor>
407  {
408  typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type
409  _Bound_indexes;
410 
411  _Functor _M_f;
412  tuple<_Bound_args...> _M_bound_args;
413 
414  // Call unqualified
415  template<typename _Result, typename... _Args, std::size_t... _Indexes>
416  _GLIBCXX20_CONSTEXPR
417  _Result
418  __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>)
419  {
420  return std::__invoke(_M_f,
421  _Mu<_Bound_args>()(std::get<_Indexes>(_M_bound_args), __args)...
422  );
423  }
424 
425  // Call as const
426  template<typename _Result, typename... _Args, std::size_t... _Indexes>
427  _GLIBCXX20_CONSTEXPR
428  _Result
429  __call_c(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) const
430  {
431  return std::__invoke(_M_f,
432  _Mu<_Bound_args>()(std::get<_Indexes>(_M_bound_args), __args)...
433  );
434  }
435 
436  // Call as volatile
437  template<typename _Result, typename... _Args, std::size_t... _Indexes>
438  _Result
439  __call_v(tuple<_Args...>&& __args,
440  _Index_tuple<_Indexes...>) volatile
441  {
442  return std::__invoke(_M_f,
443  _Mu<_Bound_args>()(__volget<_Indexes>(_M_bound_args), __args)...
444  );
445  }
446 
447  // Call as const volatile
448  template<typename _Result, typename... _Args, std::size_t... _Indexes>
449  _Result
450  __call_c_v(tuple<_Args...>&& __args,
451  _Index_tuple<_Indexes...>) const volatile
452  {
453  return std::__invoke(_M_f,
454  _Mu<_Bound_args>()(__volget<_Indexes>(_M_bound_args), __args)...
455  );
456  }
457 
458  template<typename _BoundArg, typename _CallArgs>
459  using _Mu_type = decltype(
460  _Mu<typename remove_cv<_BoundArg>::type>()(
461  std::declval<_BoundArg&>(), std::declval<_CallArgs&>()) );
462 
463  template<typename _Fn, typename _CallArgs, typename... _BArgs>
464  using _Res_type_impl
465  = typename result_of< _Fn&(_Mu_type<_BArgs, _CallArgs>&&...) >::type;
466 
467  template<typename _CallArgs>
468  using _Res_type = _Res_type_impl<_Functor, _CallArgs, _Bound_args...>;
469 
470  template<typename _CallArgs>
471  using __dependent = typename
472  enable_if<bool(tuple_size<_CallArgs>::value+1), _Functor>::type;
473 
474  template<typename _CallArgs, template<class> class __cv_quals>
475  using _Res_type_cv = _Res_type_impl<
476  typename __cv_quals<__dependent<_CallArgs>>::type,
477  _CallArgs,
478  typename __cv_quals<_Bound_args>::type...>;
479 
480  public:
481  template<typename... _Args>
482  explicit _GLIBCXX20_CONSTEXPR
483  _Bind(const _Functor& __f, _Args&&... __args)
484  : _M_f(__f), _M_bound_args(std::forward<_Args>(__args)...)
485  { }
486 
487  template<typename... _Args>
488  explicit _GLIBCXX20_CONSTEXPR
489  _Bind(_Functor&& __f, _Args&&... __args)
490  : _M_f(std::move(__f)), _M_bound_args(std::forward<_Args>(__args)...)
491  { }
492 
493  _Bind(const _Bind&) = default;
494  _Bind(_Bind&&) = default;
495 
496  // Call unqualified
497  template<typename... _Args,
498  typename _Result = _Res_type<tuple<_Args...>>>
499  _GLIBCXX20_CONSTEXPR
500  _Result
501  operator()(_Args&&... __args)
502  {
503  return this->__call<_Result>(
504  std::forward_as_tuple(std::forward<_Args>(__args)...),
505  _Bound_indexes());
506  }
507 
508  // Call as const
509  template<typename... _Args,
510  typename _Result = _Res_type_cv<tuple<_Args...>, add_const>>
511  _GLIBCXX20_CONSTEXPR
512  _Result
513  operator()(_Args&&... __args) const
514  {
515  return this->__call_c<_Result>(
516  std::forward_as_tuple(std::forward<_Args>(__args)...),
517  _Bound_indexes());
518  }
519 
520 #if __cplusplus > 201402L
521 # define _GLIBCXX_DEPR_BIND \
522  [[deprecated("std::bind does not support volatile in C++17")]]
523 #else
524 # define _GLIBCXX_DEPR_BIND
525 #endif
526  // Call as volatile
527  template<typename... _Args,
528  typename _Result = _Res_type_cv<tuple<_Args...>, add_volatile>>
529  _GLIBCXX_DEPR_BIND
530  _Result
531  operator()(_Args&&... __args) volatile
532  {
533  return this->__call_v<_Result>(
534  std::forward_as_tuple(std::forward<_Args>(__args)...),
535  _Bound_indexes());
536  }
537 
538  // Call as const volatile
539  template<typename... _Args,
540  typename _Result = _Res_type_cv<tuple<_Args...>, add_cv>>
541  _GLIBCXX_DEPR_BIND
542  _Result
543  operator()(_Args&&... __args) const volatile
544  {
545  return this->__call_c_v<_Result>(
546  std::forward_as_tuple(std::forward<_Args>(__args)...),
547  _Bound_indexes());
548  }
549  };
550 
551  /// Type of the function object returned from bind<R>().
552  template<typename _Result, typename _Signature>
554 
555  template<typename _Result, typename _Functor, typename... _Bound_args>
556  class _Bind_result<_Result, _Functor(_Bound_args...)>
557  {
558  typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type
559  _Bound_indexes;
560 
561  _Functor _M_f;
562  tuple<_Bound_args...> _M_bound_args;
563 
564  // Call unqualified
565  template<typename _Res, typename... _Args, std::size_t... _Indexes>
566  _GLIBCXX20_CONSTEXPR
567  _Res
568  __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>)
569  {
570  return std::__invoke_r<_Res>(_M_f, _Mu<_Bound_args>()
571  (std::get<_Indexes>(_M_bound_args), __args)...);
572  }
573 
574  // Call as const
575  template<typename _Res, typename... _Args, std::size_t... _Indexes>
576  _GLIBCXX20_CONSTEXPR
577  _Res
578  __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) const
579  {
580  return std::__invoke_r<_Res>(_M_f, _Mu<_Bound_args>()
581  (std::get<_Indexes>(_M_bound_args), __args)...);
582  }
583 
584  // Call as volatile
585  template<typename _Res, typename... _Args, std::size_t... _Indexes>
586  _GLIBCXX20_CONSTEXPR
587  _Res
588  __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) volatile
589  {
590  return std::__invoke_r<_Res>(_M_f, _Mu<_Bound_args>()
591  (__volget<_Indexes>(_M_bound_args), __args)...);
592  }
593 
594  // Call as const volatile
595  template<typename _Res, typename... _Args, std::size_t... _Indexes>
596  _GLIBCXX20_CONSTEXPR
597  _Res
598  __call(tuple<_Args...>&& __args,
599  _Index_tuple<_Indexes...>) const volatile
600  {
601  return std::__invoke_r<_Res>(_M_f, _Mu<_Bound_args>()
602  (__volget<_Indexes>(_M_bound_args), __args)...);
603  }
604 
605  public:
606  typedef _Result result_type;
607 
608  template<typename... _Args>
609  explicit _GLIBCXX20_CONSTEXPR
610  _Bind_result(const _Functor& __f, _Args&&... __args)
611  : _M_f(__f), _M_bound_args(std::forward<_Args>(__args)...)
612  { }
613 
614  template<typename... _Args>
615  explicit _GLIBCXX20_CONSTEXPR
616  _Bind_result(_Functor&& __f, _Args&&... __args)
617  : _M_f(std::move(__f)), _M_bound_args(std::forward<_Args>(__args)...)
618  { }
619 
620  _Bind_result(const _Bind_result&) = default;
621  _Bind_result(_Bind_result&&) = default;
622 
623  // Call unqualified
624  template<typename... _Args>
625  _GLIBCXX20_CONSTEXPR
626  result_type
627  operator()(_Args&&... __args)
628  {
629  return this->__call<_Result>(
630  std::forward_as_tuple(std::forward<_Args>(__args)...),
631  _Bound_indexes());
632  }
633 
634  // Call as const
635  template<typename... _Args>
636  _GLIBCXX20_CONSTEXPR
637  result_type
638  operator()(_Args&&... __args) const
639  {
640  return this->__call<_Result>(
641  std::forward_as_tuple(std::forward<_Args>(__args)...),
642  _Bound_indexes());
643  }
644 
645  // Call as volatile
646  template<typename... _Args>
647  _GLIBCXX_DEPR_BIND
648  result_type
649  operator()(_Args&&... __args) volatile
650  {
651  return this->__call<_Result>(
652  std::forward_as_tuple(std::forward<_Args>(__args)...),
653  _Bound_indexes());
654  }
655 
656  // Call as const volatile
657  template<typename... _Args>
658  _GLIBCXX_DEPR_BIND
659  result_type
660  operator()(_Args&&... __args) const volatile
661  {
662  return this->__call<_Result>(
663  std::forward_as_tuple(std::forward<_Args>(__args)...),
664  _Bound_indexes());
665  }
666  };
667 #undef _GLIBCXX_DEPR_BIND
668 
669  /**
670  * @brief Class template _Bind is always a bind expression.
671  * @ingroup binders
672  */
673  template<typename _Signature>
674  struct is_bind_expression<_Bind<_Signature> >
675  : public true_type { };
676 
677  /**
678  * @brief Class template _Bind is always a bind expression.
679  * @ingroup binders
680  */
681  template<typename _Signature>
682  struct is_bind_expression<const _Bind<_Signature> >
683  : public true_type { };
684 
685  /**
686  * @brief Class template _Bind is always a bind expression.
687  * @ingroup binders
688  */
689  template<typename _Signature>
690  struct is_bind_expression<volatile _Bind<_Signature> >
691  : public true_type { };
692 
693  /**
694  * @brief Class template _Bind is always a bind expression.
695  * @ingroup binders
696  */
697  template<typename _Signature>
698  struct is_bind_expression<const volatile _Bind<_Signature>>
699  : public true_type { };
700 
701  /**
702  * @brief Class template _Bind_result is always a bind expression.
703  * @ingroup binders
704  */
705  template<typename _Result, typename _Signature>
706  struct is_bind_expression<_Bind_result<_Result, _Signature>>
707  : public true_type { };
708 
709  /**
710  * @brief Class template _Bind_result is always a bind expression.
711  * @ingroup binders
712  */
713  template<typename _Result, typename _Signature>
714  struct is_bind_expression<const _Bind_result<_Result, _Signature>>
715  : public true_type { };
716 
717  /**
718  * @brief Class template _Bind_result is always a bind expression.
719  * @ingroup binders
720  */
721  template<typename _Result, typename _Signature>
722  struct is_bind_expression<volatile _Bind_result<_Result, _Signature>>
723  : public true_type { };
724 
725  /**
726  * @brief Class template _Bind_result is always a bind expression.
727  * @ingroup binders
728  */
729  template<typename _Result, typename _Signature>
730  struct is_bind_expression<const volatile _Bind_result<_Result, _Signature>>
731  : public true_type { };
732 
733  template<typename _Func, typename... _BoundArgs>
734  struct _Bind_check_arity { };
735 
736  template<typename _Ret, typename... _Args, typename... _BoundArgs>
737  struct _Bind_check_arity<_Ret (*)(_Args...), _BoundArgs...>
738  {
739  static_assert(sizeof...(_BoundArgs) == sizeof...(_Args),
740  "Wrong number of arguments for function");
741  };
742 
743  template<typename _Ret, typename... _Args, typename... _BoundArgs>
744  struct _Bind_check_arity<_Ret (*)(_Args......), _BoundArgs...>
745  {
746  static_assert(sizeof...(_BoundArgs) >= sizeof...(_Args),
747  "Wrong number of arguments for function");
748  };
749 
750  template<typename _Tp, typename _Class, typename... _BoundArgs>
751  struct _Bind_check_arity<_Tp _Class::*, _BoundArgs...>
752  {
753  using _Arity = typename _Mem_fn<_Tp _Class::*>::_Arity;
754  using _Varargs = typename _Mem_fn<_Tp _Class::*>::_Varargs;
755  static_assert(_Varargs::value
756  ? sizeof...(_BoundArgs) >= _Arity::value + 1
757  : sizeof...(_BoundArgs) == _Arity::value + 1,
758  "Wrong number of arguments for pointer-to-member");
759  };
760 
761  // Trait type used to remove std::bind() from overload set via SFINAE
762  // when first argument has integer type, so that std::bind() will
763  // not be a better match than ::bind() from the BSD Sockets API.
764  template<typename _Tp, typename _Tp2 = typename decay<_Tp>::type>
765  using __is_socketlike = __or_<is_integral<_Tp2>, is_enum<_Tp2>>;
766 
767  template<bool _SocketLike, typename _Func, typename... _BoundArgs>
768  struct _Bind_helper
769  : _Bind_check_arity<typename decay<_Func>::type, _BoundArgs...>
770  {
771  typedef typename decay<_Func>::type __func_type;
772  typedef _Bind<__func_type(typename decay<_BoundArgs>::type...)> type;
773  };
774 
775  // Partial specialization for is_socketlike == true, does not define
776  // nested type so std::bind() will not participate in overload resolution
777  // when the first argument might be a socket file descriptor.
778  template<typename _Func, typename... _BoundArgs>
779  struct _Bind_helper<true, _Func, _BoundArgs...>
780  { };
781 
782  /**
783  * @brief Function template for std::bind.
784  * @ingroup binders
785  */
786  template<typename _Func, typename... _BoundArgs>
787  inline _GLIBCXX20_CONSTEXPR typename
788  _Bind_helper<__is_socketlike<_Func>::value, _Func, _BoundArgs...>::type
789  bind(_Func&& __f, _BoundArgs&&... __args)
790  {
791  typedef _Bind_helper<false, _Func, _BoundArgs...> __helper_type;
792  return typename __helper_type::type(std::forward<_Func>(__f),
793  std::forward<_BoundArgs>(__args)...);
794  }
795 
796  template<typename _Result, typename _Func, typename... _BoundArgs>
797  struct _Bindres_helper
798  : _Bind_check_arity<typename decay<_Func>::type, _BoundArgs...>
799  {
800  typedef typename decay<_Func>::type __functor_type;
801  typedef _Bind_result<_Result,
802  __functor_type(typename decay<_BoundArgs>::type...)>
803  type;
804  };
805 
806  /**
807  * @brief Function template for std::bind<R>.
808  * @ingroup binders
809  */
810  template<typename _Result, typename _Func, typename... _BoundArgs>
811  inline _GLIBCXX20_CONSTEXPR
812  typename _Bindres_helper<_Result, _Func, _BoundArgs...>::type
813  bind(_Func&& __f, _BoundArgs&&... __args)
814  {
815  typedef _Bindres_helper<_Result, _Func, _BoundArgs...> __helper_type;
816  return typename __helper_type::type(std::forward<_Func>(__f),
817  std::forward<_BoundArgs>(__args)...);
818  }
819 
820 #if __cplusplus > 201703L
821 #define __cpp_lib_bind_front 201907L
822 
823  template<typename _Fd, typename... _BoundArgs>
824  struct _Bind_front
825  {
826  static_assert(is_move_constructible_v<_Fd>);
827  static_assert((is_move_constructible_v<_BoundArgs> && ...));
828 
829  // First parameter is to ensure this constructor is never used
830  // instead of the copy/move constructor.
831  template<typename _Fn, typename... _Args>
832  explicit constexpr
833  _Bind_front(int, _Fn&& __fn, _Args&&... __args)
834  noexcept(__and_<is_nothrow_constructible<_Fd, _Fn>,
835  is_nothrow_constructible<_BoundArgs, _Args>...>::value)
836  : _M_fd(std::forward<_Fn>(__fn)),
837  _M_bound_args(std::forward<_Args>(__args)...)
838  { static_assert(sizeof...(_Args) == sizeof...(_BoundArgs)); }
839 
840  _Bind_front(const _Bind_front&) = default;
841  _Bind_front(_Bind_front&&) = default;
842  _Bind_front& operator=(const _Bind_front&) = default;
843  _Bind_front& operator=(_Bind_front&&) = default;
844  ~_Bind_front() = default;
845 
846  template<typename... _CallArgs>
847  constexpr
848  invoke_result_t<_Fd&, _BoundArgs&..., _CallArgs...>
849  operator()(_CallArgs&&... __call_args) &
850  noexcept(is_nothrow_invocable_v<_Fd&, _BoundArgs&..., _CallArgs...>)
851  {
852  return _S_call(*this, _BoundIndices(),
853  std::forward<_CallArgs>(__call_args)...);
854  }
855 
856  template<typename... _CallArgs>
857  constexpr
858  invoke_result_t<const _Fd&, const _BoundArgs&..., _CallArgs...>
859  operator()(_CallArgs&&... __call_args) const &
860  noexcept(is_nothrow_invocable_v<const _Fd&, const _BoundArgs&...,
861  _CallArgs...>)
862  {
863  return _S_call(*this, _BoundIndices(),
864  std::forward<_CallArgs>(__call_args)...);
865  }
866 
867  template<typename... _CallArgs>
868  constexpr
869  invoke_result_t<_Fd, _BoundArgs..., _CallArgs...>
870  operator()(_CallArgs&&... __call_args) &&
871  noexcept(is_nothrow_invocable_v<_Fd, _BoundArgs..., _CallArgs...>)
872  {
873  return _S_call(std::move(*this), _BoundIndices(),
874  std::forward<_CallArgs>(__call_args)...);
875  }
876 
877  template<typename... _CallArgs>
878  constexpr
879  invoke_result_t<const _Fd, const _BoundArgs..., _CallArgs...>
880  operator()(_CallArgs&&... __call_args) const &&
881  noexcept(is_nothrow_invocable_v<const _Fd, const _BoundArgs...,
882  _CallArgs...>)
883  {
884  return _S_call(std::move(*this), _BoundIndices(),
885  std::forward<_CallArgs>(__call_args)...);
886  }
887 
888  private:
889  using _BoundIndices = index_sequence_for<_BoundArgs...>;
890 
891  template<typename _Tp, size_t... _Ind, typename... _CallArgs>
892  static constexpr
893  decltype(auto)
894  _S_call(_Tp&& __g, index_sequence<_Ind...>, _CallArgs&&... __call_args)
895  {
896  return std::invoke(std::forward<_Tp>(__g)._M_fd,
897  std::get<_Ind>(std::forward<_Tp>(__g)._M_bound_args)...,
898  std::forward<_CallArgs>(__call_args)...);
899  }
900 
901  _Fd _M_fd;
902  std::tuple<_BoundArgs...> _M_bound_args;
903  };
904 
905  template<typename _Fn, typename... _Args>
906  using _Bind_front_t
907  = _Bind_front<decay_t<_Fn>, decay_t<_Args>...>;
908 
909  template<typename _Fn, typename... _Args>
910  constexpr _Bind_front_t<_Fn, _Args...>
911  bind_front(_Fn&& __fn, _Args&&... __args)
912  noexcept(is_nothrow_constructible_v<_Bind_front_t<_Fn, _Args...>,
913  int, _Fn, _Args...>)
914  {
915  return _Bind_front_t<_Fn, _Args...>(0, std::forward<_Fn>(__fn),
916  std::forward<_Args>(__args)...);
917  }
918 #endif
919 
920 #if __cplusplus >= 201402L
921  /// Generalized negator.
922  template<typename _Fn>
923  class _Not_fn
924  {
925  template<typename _Fn2, typename... _Args>
926  using __inv_res_t = typename __invoke_result<_Fn2, _Args...>::type;
927 
928  template<typename _Tp>
929  static decltype(!std::declval<_Tp>())
930  _S_not() noexcept(noexcept(!std::declval<_Tp>()));
931 
932  public:
933  template<typename _Fn2>
934  constexpr
935  _Not_fn(_Fn2&& __fn, int)
936  : _M_fn(std::forward<_Fn2>(__fn)) { }
937 
938  _Not_fn(const _Not_fn& __fn) = default;
939  _Not_fn(_Not_fn&& __fn) = default;
940  ~_Not_fn() = default;
941 
942  // Macro to define operator() with given cv-qualifiers ref-qualifiers,
943  // forwarding _M_fn and the function arguments with the same qualifiers,
944  // and deducing the return type and exception-specification.
945 #define _GLIBCXX_NOT_FN_CALL_OP( _QUALS ) \
946  template<typename... _Args> \
947  _GLIBCXX20_CONSTEXPR \
948  decltype(_S_not<__inv_res_t<_Fn _QUALS, _Args...>>()) \
949  operator()(_Args&&... __args) _QUALS \
950  noexcept(__is_nothrow_invocable<_Fn _QUALS, _Args...>::value \
951  && noexcept(_S_not<__inv_res_t<_Fn _QUALS, _Args...>>())) \
952  { \
953  return !std::__invoke(std::forward< _Fn _QUALS >(_M_fn), \
954  std::forward<_Args>(__args)...); \
955  }
956  _GLIBCXX_NOT_FN_CALL_OP( & )
957  _GLIBCXX_NOT_FN_CALL_OP( const & )
958  _GLIBCXX_NOT_FN_CALL_OP( && )
959  _GLIBCXX_NOT_FN_CALL_OP( const && )
960 #undef _GLIBCXX_NOT_FN_CALL_OP
961 
962  private:
963  _Fn _M_fn;
964  };
965 
966  template<typename _Tp, typename _Pred>
967  struct __is_byte_like : false_type { };
968 
969  template<typename _Tp>
970  struct __is_byte_like<_Tp, equal_to<_Tp>>
971  : __bool_constant<sizeof(_Tp) == 1 && is_integral<_Tp>::value> { };
972 
973  template<typename _Tp>
974  struct __is_byte_like<_Tp, equal_to<void>>
975  : __bool_constant<sizeof(_Tp) == 1 && is_integral<_Tp>::value> { };
976 
977 #if __cplusplus >= 201703L
978  // Declare std::byte (full definition is in <cstddef>).
979  enum class byte : unsigned char;
980 
981  template<>
982  struct __is_byte_like<byte, equal_to<byte>>
983  : true_type { };
984 
985  template<>
986  struct __is_byte_like<byte, equal_to<void>>
987  : true_type { };
988 
989 #define __cpp_lib_not_fn 201603
990  /// [func.not_fn] Function template not_fn
991  template<typename _Fn>
992  _GLIBCXX20_CONSTEXPR
993  inline auto
994  not_fn(_Fn&& __fn)
995  noexcept(std::is_nothrow_constructible<std::decay_t<_Fn>, _Fn&&>::value)
996  {
997  return _Not_fn<std::decay_t<_Fn>>{std::forward<_Fn>(__fn), 0};
998  }
999 
1000  // Searchers
1001 #define __cpp_lib_boyer_moore_searcher 201603
1002 
1003  template<typename _ForwardIterator1, typename _BinaryPredicate = equal_to<>>
1004  class default_searcher
1005  {
1006  public:
1007  _GLIBCXX20_CONSTEXPR
1008  default_searcher(_ForwardIterator1 __pat_first,
1009  _ForwardIterator1 __pat_last,
1010  _BinaryPredicate __pred = _BinaryPredicate())
1011  : _M_m(__pat_first, __pat_last, std::move(__pred))
1012  { }
1013 
1014  template<typename _ForwardIterator2>
1015  _GLIBCXX20_CONSTEXPR
1017  operator()(_ForwardIterator2 __first, _ForwardIterator2 __last) const
1018  {
1019  _ForwardIterator2 __first_ret =
1020  std::search(__first, __last, std::get<0>(_M_m), std::get<1>(_M_m),
1021  std::get<2>(_M_m));
1022  auto __ret = std::make_pair(__first_ret, __first_ret);
1023  if (__ret.first != __last)
1024  std::advance(__ret.second, std::distance(std::get<0>(_M_m),
1025  std::get<1>(_M_m)));
1026  return __ret;
1027  }
1028 
1029  private:
1031  };
1032 
1033  template<typename _Key, typename _Tp, typename _Hash, typename _Pred>
1034  struct __boyer_moore_map_base
1035  {
1036  template<typename _RAIter>
1037  __boyer_moore_map_base(_RAIter __pat, size_t __patlen,
1038  _Hash&& __hf, _Pred&& __pred)
1039  : _M_bad_char{ __patlen, std::move(__hf), std::move(__pred) }
1040  {
1041  if (__patlen > 0)
1042  for (__diff_type __i = 0; __i < __patlen - 1; ++__i)
1043  _M_bad_char[__pat[__i]] = __patlen - 1 - __i;
1044  }
1045 
1046  using __diff_type = _Tp;
1047 
1048  __diff_type
1049  _M_lookup(_Key __key, __diff_type __not_found) const
1050  {
1051  auto __iter = _M_bad_char.find(__key);
1052  if (__iter == _M_bad_char.end())
1053  return __not_found;
1054  return __iter->second;
1055  }
1056 
1057  _Pred
1058  _M_pred() const { return _M_bad_char.key_eq(); }
1059 
1060  _GLIBCXX_STD_C::unordered_map<_Key, _Tp, _Hash, _Pred> _M_bad_char;
1061  };
1062 
1063  template<typename _Tp, size_t _Len, typename _Pred>
1064  struct __boyer_moore_array_base
1065  {
1066  template<typename _RAIter, typename _Unused>
1067  __boyer_moore_array_base(_RAIter __pat, size_t __patlen,
1068  _Unused&&, _Pred&& __pred)
1069  : _M_bad_char{ array<_Tp, _Len>{}, std::move(__pred) }
1070  {
1071  std::get<0>(_M_bad_char).fill(__patlen);
1072  if (__patlen > 0)
1073  for (__diff_type __i = 0; __i < __patlen - 1; ++__i)
1074  {
1075  auto __ch = __pat[__i];
1076  using _UCh = make_unsigned_t<decltype(__ch)>;
1077  auto __uch = static_cast<_UCh>(__ch);
1078  std::get<0>(_M_bad_char)[__uch] = __patlen - 1 - __i;
1079  }
1080  }
1081 
1082  using __diff_type = _Tp;
1083 
1084  template<typename _Key>
1085  __diff_type
1086  _M_lookup(_Key __key, __diff_type __not_found) const
1087  {
1088  auto __ukey = static_cast<make_unsigned_t<_Key>>(__key);
1089  if (__ukey >= _Len)
1090  return __not_found;
1091  return std::get<0>(_M_bad_char)[__ukey];
1092  }
1093 
1094  const _Pred&
1095  _M_pred() const { return std::get<1>(_M_bad_char); }
1096 
1097  tuple<array<_Tp, _Len>, _Pred> _M_bad_char;
1098  };
1099 
1100  // Use __boyer_moore_array_base when pattern consists of narrow characters
1101  // (or std::byte) and uses std::equal_to as the predicate.
1102  template<typename _RAIter, typename _Hash, typename _Pred,
1103  typename _Val = typename iterator_traits<_RAIter>::value_type,
1104  typename _Diff = typename iterator_traits<_RAIter>::difference_type>
1105  using __boyer_moore_base_t
1107  __boyer_moore_array_base<_Diff, 256, _Pred>,
1108  __boyer_moore_map_base<_Val, _Diff, _Hash, _Pred>>;
1109 
1110  template<typename _RAIter, typename _Hash
1112  typename _BinaryPredicate = equal_to<>>
1113  class boyer_moore_searcher
1114  : __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate>
1115  {
1116  using _Base = __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate>;
1117  using typename _Base::__diff_type;
1118 
1119  public:
1120  boyer_moore_searcher(_RAIter __pat_first, _RAIter __pat_last,
1121  _Hash __hf = _Hash(),
1122  _BinaryPredicate __pred = _BinaryPredicate());
1123 
1124  template<typename _RandomAccessIterator2>
1126  operator()(_RandomAccessIterator2 __first,
1127  _RandomAccessIterator2 __last) const;
1128 
1129  private:
1130  bool
1131  _M_is_prefix(_RAIter __word, __diff_type __len,
1132  __diff_type __pos)
1133  {
1134  const auto& __pred = this->_M_pred();
1135  __diff_type __suffixlen = __len - __pos;
1136  for (__diff_type __i = 0; __i < __suffixlen; ++__i)
1137  if (!__pred(__word[__i], __word[__pos + __i]))
1138  return false;
1139  return true;
1140  }
1141 
1142  __diff_type
1143  _M_suffix_length(_RAIter __word, __diff_type __len,
1144  __diff_type __pos)
1145  {
1146  const auto& __pred = this->_M_pred();
1147  __diff_type __i = 0;
1148  while (__pred(__word[__pos - __i], __word[__len - 1 - __i])
1149  && __i < __pos)
1150  {
1151  ++__i;
1152  }
1153  return __i;
1154  }
1155 
1156  template<typename _Tp>
1157  __diff_type
1158  _M_bad_char_shift(_Tp __c) const
1159  { return this->_M_lookup(__c, _M_pat_end - _M_pat); }
1160 
1161  _RAIter _M_pat;
1162  _RAIter _M_pat_end;
1163  _GLIBCXX_STD_C::vector<__diff_type> _M_good_suffix;
1164  };
1165 
1166  template<typename _RAIter, typename _Hash
1168  typename _BinaryPredicate = equal_to<>>
1169  class boyer_moore_horspool_searcher
1170  : __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate>
1171  {
1172  using _Base = __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate>;
1173  using typename _Base::__diff_type;
1174 
1175  public:
1176  boyer_moore_horspool_searcher(_RAIter __pat,
1177  _RAIter __pat_end,
1178  _Hash __hf = _Hash(),
1179  _BinaryPredicate __pred
1180  = _BinaryPredicate())
1181  : _Base(__pat, __pat_end - __pat, std::move(__hf), std::move(__pred)),
1182  _M_pat(__pat), _M_pat_end(__pat_end)
1183  { }
1184 
1185  template<typename _RandomAccessIterator2>
1187  operator()(_RandomAccessIterator2 __first,
1188  _RandomAccessIterator2 __last) const
1189  {
1190  const auto& __pred = this->_M_pred();
1191  auto __patlen = _M_pat_end - _M_pat;
1192  if (__patlen == 0)
1193  return std::make_pair(__first, __first);
1194  auto __len = __last - __first;
1195  while (__len >= __patlen)
1196  {
1197  for (auto __scan = __patlen - 1;
1198  __pred(__first[__scan], _M_pat[__scan]); --__scan)
1199  if (__scan == 0)
1200  return std::make_pair(__first, __first + __patlen);
1201  auto __shift = _M_bad_char_shift(__first[__patlen - 1]);
1202  __len -= __shift;
1203  __first += __shift;
1204  }
1205  return std::make_pair(__last, __last);
1206  }
1207 
1208  private:
1209  template<typename _Tp>
1210  __diff_type
1211  _M_bad_char_shift(_Tp __c) const
1212  { return this->_M_lookup(__c, _M_pat_end - _M_pat); }
1213 
1214  _RAIter _M_pat;
1215  _RAIter _M_pat_end;
1216  };
1217 
1218  template<typename _RAIter, typename _Hash, typename _BinaryPredicate>
1219  boyer_moore_searcher<_RAIter, _Hash, _BinaryPredicate>::
1220  boyer_moore_searcher(_RAIter __pat, _RAIter __pat_end,
1221  _Hash __hf, _BinaryPredicate __pred)
1222  : _Base(__pat, __pat_end - __pat, std::move(__hf), std::move(__pred)),
1223  _M_pat(__pat), _M_pat_end(__pat_end), _M_good_suffix(__pat_end - __pat)
1224  {
1225  auto __patlen = __pat_end - __pat;
1226  if (__patlen == 0)
1227  return;
1228  __diff_type __last_prefix = __patlen - 1;
1229  for (__diff_type __p = __patlen - 1; __p >= 0; --__p)
1230  {
1231  if (_M_is_prefix(__pat, __patlen, __p + 1))
1232  __last_prefix = __p + 1;
1233  _M_good_suffix[__p] = __last_prefix + (__patlen - 1 - __p);
1234  }
1235  for (__diff_type __p = 0; __p < __patlen - 1; ++__p)
1236  {
1237  auto __slen = _M_suffix_length(__pat, __patlen, __p);
1238  auto __pos = __patlen - 1 - __slen;
1239  if (!__pred(__pat[__p - __slen], __pat[__pos]))
1240  _M_good_suffix[__pos] = __patlen - 1 - __p + __slen;
1241  }
1242  }
1243 
1244  template<typename _RAIter, typename _Hash, typename _BinaryPredicate>
1245  template<typename _RandomAccessIterator2>
1247  boyer_moore_searcher<_RAIter, _Hash, _BinaryPredicate>::
1248  operator()(_RandomAccessIterator2 __first,
1249  _RandomAccessIterator2 __last) const
1250  {
1251  auto __patlen = _M_pat_end - _M_pat;
1252  if (__patlen == 0)
1253  return std::make_pair(__first, __first);
1254  const auto& __pred = this->_M_pred();
1255  __diff_type __i = __patlen - 1;
1256  auto __stringlen = __last - __first;
1257  while (__i < __stringlen)
1258  {
1259  __diff_type __j = __patlen - 1;
1260  while (__j >= 0 && __pred(__first[__i], _M_pat[__j]))
1261  {
1262  --__i;
1263  --__j;
1264  }
1265  if (__j < 0)
1266  {
1267  const auto __match = __first + __i + 1;
1268  return std::make_pair(__match, __match + __patlen);
1269  }
1270  __i += std::max(_M_bad_char_shift(__first[__i]),
1271  _M_good_suffix[__j]);
1272  }
1273  return std::make_pair(__last, __last);
1274  }
1275 
1276 #endif // C++17
1277 #endif // C++14
1278 #endif // C++11
1279 
1280 _GLIBCXX_END_NAMESPACE_VERSION
1281 } // namespace std
1282 
1283 #endif // _GLIBCXX_FUNCTIONAL
constexpr tuple< _Elements &&...> forward_as_tuple(_Elements &&...__args) noexcept
std::forward_as_tuple
Definition: tuple:1606
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
Definition: move.h:104
Primary class template hash.
Definition: string_view:686
Determines if the given type _Tp is a function object that should be treated as a subexpression when ...
Definition: functional:193
constexpr iterator_traits< _InputIterator >::difference_type distance(_InputIterator __first, _InputIterator __last)
A generalization of pointer arithmetic.
A standard container for storing a fixed size sequence of elements.
Definition: array:95
typename make_unsigned< _Tp >::type make_unsigned_t
Alias template for make_unsigned.
Definition: type_traits:1925
integral_constant< bool, true > true_type
The type used as a compile-time boolean with true value.
Definition: type_traits:75
Struct holding two objects of arbitrary type.
Definition: stl_pair.h:211
typename decay< _Tp >::type decay_t
Alias template for decay.
Definition: type_traits:2510
Traits class for iterators.
One of the comparison functors.
Definition: stl_function.h:331
byte
std::byte
Definition: cstddef:69
constexpr bool is_nothrow_invocable_v
std::is_nothrow_invocable_v
Definition: type_traits:3006
constexpr _Bind_helper< __is_socketlike< _Func >::value, _Func, _BoundArgs...>::type bind(_Func &&__f, _BoundArgs &&...__args)
Function template for std::bind.
Definition: functional:789
typename invoke_result< _Fn, _Args...>::type invoke_result_t
std::invoke_result_t
Definition: type_traits:2933
is_nothrow_constructible
Definition: type_traits:975
constexpr _ForwardIterator search(_ForwardIterator __first, _ForwardIterator __last, const _Searcher &__searcher)
Search a sequence using a Searcher object.
Definition: stl_algo.h:4260
constexpr _Tp && forward(typename std::remove_reference< _Tp >::type &__t) noexcept
Forward an lvalue.
Definition: move.h:77
typename conditional< _Cond, _Iftrue, _Iffalse >::type conditional_t
Alias template for conditional.
Definition: type_traits:2518
constexpr _Mem_fn< _Tp _Class::* > mem_fn(_Tp _Class::*__pm) noexcept
Returns a function object that forwards to the member pointer pm.
Definition: functional:179
Determines if the given type _Tp is a placeholder in a bind() expression and, if so, which placeholder it is.
Definition: functional:204
integral_constant< bool, false > false_type
The type used as a compile-time boolean with false value.
Definition: type_traits:78
Primary class template for reference_wrapper.
Definition: type_traits:2120
make_index_sequence< sizeof...(_Types)> index_sequence_for
Alias template index_sequence_for.
Definition: utility:347
Type of the function object returned from bind&lt;R&gt;().
Definition: functional:553
constexpr const _Tp & max(const _Tp &, const _Tp &)
This does what you think it does.
Definition: stl_algobase.h:254
The type of placeholder objects defined by libstdc++.
Definition: functional:81
integral_constant
Definition: type_traits:57
Primary class template, tuple.
Definition: tuple:57
integer_sequence< size_t, _Idx...> index_sequence
Alias template index_sequence.
Definition: utility:339
Generalized negator.
Definition: functional:923
Type of the function object returned from bind().
Definition: functional:402
auto_ptr & operator=(auto_ptr &__a)
auto_ptr assignment operator.
Definition: auto_ptr.h:128