libstdc++
bits/fs_path.h
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1 // Class filesystem::path -*- C++ -*-
2 
3 // Copyright (C) 2014-2022 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 /** @file include/bits/fs_path.h
26  * This is an internal header file, included by other library headers.
27  * Do not attempt to use it directly. @headername{filesystem}
28  */
29 
30 #ifndef _GLIBCXX_FS_PATH_H
31 #define _GLIBCXX_FS_PATH_H 1
32 
33 #if __cplusplus >= 201703L
34 
35 #include <type_traits>
36 #include <locale>
37 #include <iosfwd>
38 #include <iomanip>
39 #include <codecvt>
40 #include <string_view>
41 #include <system_error>
42 #include <bits/stl_algobase.h>
43 #include <bits/stl_pair.h>
44 #include <bits/locale_conv.h>
45 #include <ext/concurrence.h>
46 #include <bits/shared_ptr.h>
47 #include <bits/unique_ptr.h>
48 
49 #if __cplusplus > 201703L
50 # include <compare>
51 #endif
52 
53 #if defined(_WIN32) && !defined(__CYGWIN__)
54 # define _GLIBCXX_FILESYSTEM_IS_WINDOWS 1
55 #endif
56 
57 namespace std _GLIBCXX_VISIBILITY(default)
58 {
59 _GLIBCXX_BEGIN_NAMESPACE_VERSION
60 
61 namespace filesystem
62 {
63 _GLIBCXX_BEGIN_NAMESPACE_CXX11
64 
65  class path;
66 
67  /// @cond undocumented
68 namespace __detail
69 {
70  /// @addtogroup filesystem
71  /// @{
72  template<typename _CharT>
73  inline constexpr bool __is_encoded_char = false;
74  template<>
75  inline constexpr bool __is_encoded_char<char> = true;
76 #ifdef _GLIBCXX_USE_CHAR8_T
77  template<>
78  inline constexpr bool __is_encoded_char<char8_t> = true;
79 #endif
80 #if _GLIBCXX_USE_WCHAR_T
81  template<>
82  inline constexpr bool __is_encoded_char<wchar_t> = true;
83 #endif
84  template<>
85  inline constexpr bool __is_encoded_char<char16_t> = true;
86  template<>
87  inline constexpr bool __is_encoded_char<char32_t> = true;
88 
89 #if __cpp_concepts >= 201907L
90  template<typename _Iter>
91  using __safe_iterator_traits = std::iterator_traits<_Iter>;
92 #else
93  template<typename _Iter>
94  struct __safe_iterator_traits : std::iterator_traits<_Iter>
95  { };
96 
97  // Protect against ill-formed iterator_traits specializations in C++17
98  template<> struct __safe_iterator_traits<void*> { };
99  template<> struct __safe_iterator_traits<const void*> { };
100  template<> struct __safe_iterator_traits<volatile void*> { };
101  template<> struct __safe_iterator_traits<const volatile void*> { };
102 #endif
103 
104  template<typename _Iter_traits, typename = void>
105  struct __is_path_iter_src
106  : false_type
107  { };
108 
109  template<typename _Iter_traits>
110  struct __is_path_iter_src<_Iter_traits,
111  void_t<typename _Iter_traits::value_type>>
112  : bool_constant<__is_encoded_char<typename _Iter_traits::value_type>>
113  { };
114 
115  template<typename _Source>
116  inline constexpr bool __is_path_src
117  = __is_path_iter_src<iterator_traits<decay_t<_Source>>>::value;
118 
119  template<>
120  inline constexpr bool __is_path_src<path> = false;
121 
122  template<>
123  inline constexpr bool __is_path_src<volatile path> = false;
124 
125  template<>
126  inline constexpr bool __is_path_src<void*> = false;
127 
128  template<>
129  inline constexpr bool __is_path_src<const void*> = false;
130 
131  template<>
132  inline constexpr bool __is_path_src<volatile void*> = false;
133 
134  template<>
135  inline constexpr bool __is_path_src<const volatile void*> = false;
136 
137  template<typename _CharT, typename _Traits, typename _Alloc>
138  inline constexpr bool
139  __is_path_src<basic_string<_CharT, _Traits, _Alloc>>
140  = __is_encoded_char<_CharT>;
141 
142  template<typename _CharT, typename _Traits>
143  inline constexpr bool
144  __is_path_src<basic_string_view<_CharT, _Traits>>
145  = __is_encoded_char<_CharT>;
146 
147  // SFINAE constraint for Source parameters as required by [fs.path.req].
148  template<typename _Tp>
149  using _Path = enable_if_t<__is_path_src<_Tp>, path>;
150 
151  // SFINAE constraint for InputIterator parameters as required by [fs.req].
152  template<typename _Iter, typename _Tr = __safe_iterator_traits<_Iter>>
153  using _Path2 = enable_if_t<__is_path_iter_src<_Tr>::value, path>;
154 
155 #if __cpp_lib_concepts
156  template<typename _Iter>
157  constexpr bool __is_contiguous = std::contiguous_iterator<_Iter>;
158 #else
159  template<typename _Iter>
160  constexpr bool __is_contiguous = false;
161 #endif
162 
163  template<typename _Tp>
164  constexpr bool __is_contiguous<_Tp*> = true;
165 
166  template<typename _Tp, typename _Seq>
167  constexpr bool
168  __is_contiguous<__gnu_cxx::__normal_iterator<_Tp*, _Seq>> = true;
169 
170 #if !defined _GLIBCXX_FILESYSTEM_IS_WINDOWS && defined _GLIBCXX_USE_CHAR8_T
171  // For POSIX treat char8_t sequences as char without encoding conversions.
172  template<typename _EcharT>
173  using __unified_u8_t
174  = __conditional_t<is_same_v<_EcharT, char8_t>, char, _EcharT>;
175 #else
176  template<typename _EcharT>
177  using __unified_u8_t = _EcharT;
178 #endif
179 
180  // The __effective_range overloads convert a Source parameter into
181  // either a basic_string_view<C> or basic_string<C> containing the
182  // effective range of the Source, as defined in [fs.path.req].
183 
184  template<typename _CharT, typename _Traits, typename _Alloc>
185  inline basic_string_view<_CharT>
186  __effective_range(const basic_string<_CharT, _Traits, _Alloc>& __source)
187  noexcept
188  { return __source; }
189 
190  template<typename _CharT, typename _Traits>
191  inline basic_string_view<_CharT>
192  __effective_range(const basic_string_view<_CharT, _Traits>& __source)
193  noexcept
194  { return __source; }
195 
196  // Return the effective range of an NTCTS.
197  template<typename _Source>
198  auto
199  __effective_range(const _Source& __source)
200  {
201  // Remove a level of normal/safe iterator indirection, or decay an array.
202  using _Iter = decltype(std::__niter_base(__source));
203  using value_type = typename iterator_traits<_Iter>::value_type;
204 
205  if constexpr (__is_contiguous<_Iter>)
206  return basic_string_view<value_type>{&*__source};
207  else
208  {
209  // _Source is an input iterator that iterates over an NTCTS.
210  // Create a basic_string by reading until the null character.
211  basic_string<__unified_u8_t<value_type>> __str;
212  _Source __it = __source;
213  for (value_type __ch = *__it; __ch != value_type(); __ch = *++__it)
214  __str.push_back(__ch);
215  return __str;
216  }
217  }
218 
219  // The value type of a Source parameter's effective range.
220  template<typename _Source>
221  struct __source_value_type_impl
222  {
223  using type
224  = typename __safe_iterator_traits<decay_t<_Source>>::value_type;
225  };
226 
227  template<typename _CharT, typename _Traits, typename _Alloc>
228  struct __source_value_type_impl<basic_string<_CharT, _Traits, _Alloc>>
229  {
230  using type = _CharT;
231  };
232 
233  template<typename _CharT, typename _Traits>
234  struct __source_value_type_impl<basic_string_view<_CharT, _Traits>>
235  {
236  using type = _CharT;
237  };
238 
239  // The value type of a Source parameter's effective range.
240  template<typename _Source>
241  using __source_value_t = typename __source_value_type_impl<_Source>::type;
242 
243  // SFINAE helper to check that an effective range has value_type char,
244  // as required by path constructors taking a std::locale parameter.
245  // The type _Tp must have already been checked by _Path<Tp> or _Path2<_Tp>.
246  template<typename _Tp, typename _Val = __source_value_t<_Tp>>
247  using __value_type_is_char
249 
250  // As above, but also allows char8_t, as required by u8path
251  // C++20 [depr.fs.path.factory]
252  template<typename _Tp, typename _Val = __source_value_t<_Tp>>
253  using __value_type_is_char_or_char8_t
255 #ifdef _GLIBCXX_USE_CHAR8_T
256  || std::is_same_v<_Val, char8_t>
257 #endif
258  , _Val>;
259 
260  // Create a basic_string<C> or basic_string_view<C> from an iterator range.
261  template<typename _InputIterator>
262  inline auto
263  __string_from_range(_InputIterator __first, _InputIterator __last)
264  {
265  using _EcharT
267  static_assert(__is_encoded_char<_EcharT>); // C++17 [fs.req]/3
268 
269  if constexpr (__is_contiguous<_InputIterator>)
270  {
271  // For contiguous iterators we can just return a string view.
272  if (auto __len = __last - __first) [[__likely__]]
273  return basic_string_view<_EcharT>(&*__first, __len);
274  return basic_string_view<_EcharT>();
275  }
276  else
277  {
278  // Conversion requires contiguous characters, so create a string.
279  return basic_string<__unified_u8_t<_EcharT>>(__first, __last);
280  }
281  }
282 
283  /// @} group filesystem
284 } // namespace __detail
285  /// @endcond
286 
287  /// @addtogroup filesystem
288  /// @{
289 
290  /// A filesystem path
291  /// @ingroup filesystem
292  class path
293  {
294  public:
295 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
296  using value_type = wchar_t;
297  static constexpr value_type preferred_separator = L'\\';
298 #else
299 # ifdef _GLIBCXX_DOXYGEN
300  /// Windows uses wchar_t for path::value_type, POSIX uses char.
301  using value_type = __os_dependent__;
302 # else
303  using value_type = char;
304 # endif
305  static constexpr value_type preferred_separator = '/';
306 #endif
308 
309  /// path::format is ignored in this implementation
310  enum format : unsigned char { native_format, generic_format, auto_format };
311 
312  // constructors and destructor
313 
314  path() noexcept { }
315 
316  path(const path& __p) = default;
317 
318  path(path&& __p) noexcept
319  : _M_pathname(std::move(__p._M_pathname)),
320  _M_cmpts(std::move(__p._M_cmpts))
321  { __p.clear(); }
322 
323  path(string_type&& __source, format = auto_format)
324  : _M_pathname(std::move(__source))
325  { _M_split_cmpts(); }
326 
327  template<typename _Source,
328  typename _Require = __detail::_Path<_Source>>
329  path(_Source const& __source, format = auto_format)
330  : _M_pathname(_S_convert(__detail::__effective_range(__source)))
331  { _M_split_cmpts(); }
332 
333  template<typename _InputIterator,
334  typename _Require = __detail::_Path2<_InputIterator>>
335  path(_InputIterator __first, _InputIterator __last, format = auto_format)
336  : _M_pathname(_S_convert(__detail::__string_from_range(__first, __last)))
337  { _M_split_cmpts(); }
338 
339  template<typename _Source,
340  typename _Require = __detail::_Path<_Source>,
341  typename _Require2 = __detail::__value_type_is_char<_Source>>
342  path(_Source const& __src, const locale& __loc, format = auto_format)
343  : _M_pathname(_S_convert_loc(__detail::__effective_range(__src), __loc))
344  { _M_split_cmpts(); }
345 
346  template<typename _InputIterator,
347  typename _Require = __detail::_Path2<_InputIterator>,
348  typename _Req2 = __detail::__value_type_is_char<_InputIterator>>
349  path(_InputIterator __first, _InputIterator __last, const locale& __loc,
350  format = auto_format)
351  : _M_pathname(_S_convert_loc(__first, __last, __loc))
352  { _M_split_cmpts(); }
353 
354  ~path() = default;
355 
356  // assignments
357 
358  path& operator=(const path&);
359  path& operator=(path&&) noexcept;
360  path& operator=(string_type&& __source);
361  path& assign(string_type&& __source);
362 
363  template<typename _Source>
364  __detail::_Path<_Source>&
365  operator=(_Source const& __source)
366  { return *this = path(__source); }
367 
368  template<typename _Source>
369  __detail::_Path<_Source>&
370  assign(_Source const& __source)
371  { return *this = path(__source); }
372 
373  template<typename _InputIterator>
374  __detail::_Path2<_InputIterator>&
375  assign(_InputIterator __first, _InputIterator __last)
376  { return *this = path(__first, __last); }
377 
378  // appends
379 
380  path& operator/=(const path& __p);
381 
382  template<typename _Source>
383  __detail::_Path<_Source>&
384  operator/=(_Source const& __source)
385  {
386  _M_append(_S_convert(__detail::__effective_range(__source)));
387  return *this;
388  }
389 
390  template<typename _Source>
391  __detail::_Path<_Source>&
392  append(_Source const& __source)
393  {
394  _M_append(_S_convert(__detail::__effective_range(__source)));
395  return *this;
396  }
397 
398  template<typename _InputIterator>
399  __detail::_Path2<_InputIterator>&
400  append(_InputIterator __first, _InputIterator __last)
401  {
402  _M_append(_S_convert(__detail::__string_from_range(__first, __last)));
403  return *this;
404  }
405 
406  // concatenation
407 
408  path& operator+=(const path& __x);
409  path& operator+=(const string_type& __x);
410  path& operator+=(const value_type* __x);
411  path& operator+=(value_type __x);
412  path& operator+=(basic_string_view<value_type> __x);
413 
414  template<typename _Source>
415  __detail::_Path<_Source>&
416  operator+=(_Source const& __x) { return concat(__x); }
417 
418  template<typename _CharT>
419  __detail::_Path2<_CharT*>&
420  operator+=(_CharT __x);
421 
422  template<typename _Source>
423  __detail::_Path<_Source>&
424  concat(_Source const& __x)
425  {
426  _M_concat(_S_convert(__detail::__effective_range(__x)));
427  return *this;
428  }
429 
430  template<typename _InputIterator>
431  __detail::_Path2<_InputIterator>&
432  concat(_InputIterator __first, _InputIterator __last)
433  {
434  _M_concat(_S_convert(__detail::__string_from_range(__first, __last)));
435  return *this;
436  }
437 
438  // modifiers
439 
440  void clear() noexcept { _M_pathname.clear(); _M_split_cmpts(); }
441 
442  path& make_preferred();
443  path& remove_filename();
444  path& replace_filename(const path& __replacement);
445  path& replace_extension(const path& __replacement = path());
446 
447  void swap(path& __rhs) noexcept;
448 
449  // native format observers
450 
451  const string_type& native() const noexcept { return _M_pathname; }
452  const value_type* c_str() const noexcept { return _M_pathname.c_str(); }
453  operator string_type() const { return _M_pathname; }
454 
455  template<typename _CharT, typename _Traits = std::char_traits<_CharT>,
456  typename _Allocator = std::allocator<_CharT>>
458  string(const _Allocator& __a = _Allocator()) const;
459 
460  std::string string() const;
461 #if _GLIBCXX_USE_WCHAR_T
462  std::wstring wstring() const;
463 #endif
464 #ifdef _GLIBCXX_USE_CHAR8_T
465  __attribute__((__abi_tag__("__u8")))
466  std::u8string u8string() const;
467 #else
468  std::string u8string() const;
469 #endif // _GLIBCXX_USE_CHAR8_T
470  std::u16string u16string() const;
471  std::u32string u32string() const;
472 
473  // generic format observers
474  template<typename _CharT, typename _Traits = std::char_traits<_CharT>,
475  typename _Allocator = std::allocator<_CharT>>
477  generic_string(const _Allocator& __a = _Allocator()) const;
478 
479  std::string generic_string() const;
480 #if _GLIBCXX_USE_WCHAR_T
481  std::wstring generic_wstring() const;
482 #endif
483 #ifdef _GLIBCXX_USE_CHAR8_T
484  __attribute__((__abi_tag__("__u8")))
485  std::u8string generic_u8string() const;
486 #else
487  std::string generic_u8string() const;
488 #endif // _GLIBCXX_USE_CHAR8_T
489  std::u16string generic_u16string() const;
490  std::u32string generic_u32string() const;
491 
492  // compare
493 
494  int compare(const path& __p) const noexcept;
495  int compare(const string_type& __s) const noexcept;
496  int compare(const value_type* __s) const noexcept;
497  int compare(basic_string_view<value_type> __s) const noexcept;
498 
499  // decomposition
500 
501  path root_name() const;
502  path root_directory() const;
503  path root_path() const;
504  path relative_path() const;
505  path parent_path() const;
506  path filename() const;
507  path stem() const;
508  path extension() const;
509 
510  // query
511 
512  [[nodiscard]] bool empty() const noexcept { return _M_pathname.empty(); }
513  bool has_root_name() const noexcept;
514  bool has_root_directory() const noexcept;
515  bool has_root_path() const noexcept;
516  bool has_relative_path() const noexcept;
517  bool has_parent_path() const noexcept;
518  bool has_filename() const noexcept;
519  bool has_stem() const noexcept;
520  bool has_extension() const noexcept;
521  bool is_absolute() const noexcept;
522  bool is_relative() const noexcept { return !is_absolute(); }
523 
524  // generation
525  path lexically_normal() const;
526  path lexically_relative(const path& base) const;
527  path lexically_proximate(const path& base) const;
528 
529  // iterators
530  class iterator;
531  using const_iterator = iterator;
532 
533  iterator begin() const noexcept;
534  iterator end() const noexcept;
535 
536  /// Write a path to a stream
537  template<typename _CharT, typename _Traits>
538  friend std::basic_ostream<_CharT, _Traits>&
539  operator<<(std::basic_ostream<_CharT, _Traits>& __os, const path& __p)
540  {
541  __os << std::quoted(__p.string<_CharT, _Traits>());
542  return __os;
543  }
544 
545  /// Read a path from a stream
546  template<typename _CharT, typename _Traits>
549  {
551  if (__is >> std::quoted(__tmp))
552  __p = std::move(__tmp);
553  return __is;
554  }
555 
556  // non-member operators
557 
558  /// Compare paths
559  friend bool operator==(const path& __lhs, const path& __rhs) noexcept
560  { return path::_S_compare(__lhs, __rhs) == 0; }
561 
562 #if __cpp_lib_three_way_comparison
563  /// Compare paths
564  friend strong_ordering
565  operator<=>(const path& __lhs, const path& __rhs) noexcept
566  { return path::_S_compare(__lhs, __rhs) <=> 0; }
567 #else
568  /// Compare paths
569  friend bool operator!=(const path& __lhs, const path& __rhs) noexcept
570  { return !(__lhs == __rhs); }
571 
572  /// Compare paths
573  friend bool operator<(const path& __lhs, const path& __rhs) noexcept
574  { return __lhs.compare(__rhs) < 0; }
575 
576  /// Compare paths
577  friend bool operator<=(const path& __lhs, const path& __rhs) noexcept
578  { return !(__rhs < __lhs); }
579 
580  /// Compare paths
581  friend bool operator>(const path& __lhs, const path& __rhs) noexcept
582  { return __rhs < __lhs; }
583 
584  /// Compare paths
585  friend bool operator>=(const path& __lhs, const path& __rhs) noexcept
586  { return !(__lhs < __rhs); }
587 #endif
588 
589  /// Append one path to another
590  friend path operator/(const path& __lhs, const path& __rhs)
591  {
592  path __result(__lhs);
593  __result /= __rhs;
594  return __result;
595  }
596 
597  private:
598  enum class _Type : unsigned char {
599  _Multi = 0, _Root_name, _Root_dir, _Filename
600  };
601 
602  path(basic_string_view<value_type> __str, _Type __type)
603  : _M_pathname(__str)
604  {
605  __glibcxx_assert(__type != _Type::_Multi);
606  _M_cmpts.type(__type);
607  }
608 
609  enum class _Split { _Stem, _Extension };
610 
611  void _M_append(basic_string_view<value_type>);
612  void _M_concat(basic_string_view<value_type>);
613 
614  pair<const string_type*, size_t> _M_find_extension() const noexcept;
615 
616  // path::_S_convert creates a basic_string<value_type> or
617  // basic_string_view<value_type> from a basic_string<C> or
618  // basic_string_view<C>, for an encoded character type C,
619  // performing the conversions required by [fs.path.type.cvt].
620  template<typename _Tp>
621  static auto
622  _S_convert(_Tp __str)
623  noexcept(is_same_v<typename _Tp::value_type, value_type>)
624  {
625  if constexpr (is_same_v<typename _Tp::value_type, value_type>)
626  return __str; // No conversion needed.
627 #if !defined _GLIBCXX_FILESYSTEM_IS_WINDOWS && defined _GLIBCXX_USE_CHAR8_T
628  else if constexpr (is_same_v<_Tp, std::u8string>)
629  // Calling _S_convert<char8_t> will return a u8string_view that
630  // refers to __str and would dangle after this function returns.
631  // Return a string_type instead, to avoid dangling.
632  return string_type(_S_convert(__str.data(),
633  __str.data() + __str.size()));
634 #endif
635  else
636  return _S_convert(__str.data(), __str.data() + __str.size());
637  }
638 
639  template<typename _EcharT>
640  static auto
641  _S_convert(const _EcharT* __first, const _EcharT* __last);
642 
643  // _S_convert_loc converts a range of char to string_type, using the
644  // supplied locale for encoding conversions.
645 
646  static string_type
647  _S_convert_loc(const char* __first, const char* __last,
648  const std::locale& __loc);
649 
650  template<typename _Iter>
651  static string_type
652  _S_convert_loc(_Iter __first, _Iter __last, const std::locale& __loc)
653  {
654  const auto __s = __detail::__string_from_range(__first, __last);
655  return _S_convert_loc(__s.data(), __s.data() + __s.size(), __loc);
656  }
657 
658  template<typename _Tp>
659  static string_type
660  _S_convert_loc(const _Tp& __s, const std::locale& __loc)
661  {
662  return _S_convert_loc(__s.data(), __s.data() + __s.size(), __loc);
663  }
664 
665  template<typename _CharT, typename _Traits, typename _Allocator>
666  static basic_string<_CharT, _Traits, _Allocator>
667  _S_str_convert(basic_string_view<value_type>, const _Allocator&);
668 
669  // Returns lhs.compare(rhs), but defined after path::iterator is complete.
670  __attribute__((__always_inline__))
671  static int
672  _S_compare(const path& __lhs, const path& __rhs) noexcept;
673 
674  void _M_split_cmpts();
675 
676  _Type _M_type() const noexcept { return _M_cmpts.type(); }
677 
678  string_type _M_pathname;
679 
680  struct _Cmpt;
681 
682  struct _List
683  {
684  using value_type = _Cmpt;
685  using iterator = value_type*;
686  using const_iterator = const value_type*;
687 
688  _List();
689  _List(const _List&);
690  _List(_List&&) = default;
691  _List& operator=(const _List&);
692  _List& operator=(_List&&) = default;
693  ~_List() = default;
694 
695  _Type type() const noexcept
696  { return _Type(reinterpret_cast<uintptr_t>(_M_impl.get()) & 0x3); }
697 
698  void type(_Type) noexcept;
699 
700  int size() const noexcept; // zero unless type() == _Type::_Multi
701  bool empty() const noexcept; // true unless type() == _Type::_Multi
702  void clear();
703  void swap(_List& __l) noexcept { _M_impl.swap(__l._M_impl); }
704  int capacity() const noexcept;
705  void reserve(int, bool); ///< @pre type() == _Type::_Multi
706 
707  // All the member functions below here have a precondition !empty()
708  // (and they should only be called from within the library).
709 
710  iterator begin() noexcept;
711  iterator end() noexcept;
712  const_iterator begin() const noexcept;
713  const_iterator end() const noexcept;
714 
715  value_type& front() noexcept;
716  value_type& back() noexcept;
717  const value_type& front() const noexcept;
718  const value_type& back() const noexcept;
719 
720  void pop_back();
721  void _M_erase_from(const_iterator __pos); // erases [__pos,end())
722 
723  struct _Impl;
724  struct _Impl_deleter
725  {
726  void operator()(_Impl*) const noexcept;
727  };
728  unique_ptr<_Impl, _Impl_deleter> _M_impl;
729  };
730  _List _M_cmpts;
731 
732  struct _Parser;
733 
734  template<typename _EcharT> struct _Codecvt;
735  };
736 
737  /// @{
738  /// @relates std::filesystem::path
739 
740  inline void swap(path& __lhs, path& __rhs) noexcept { __lhs.swap(__rhs); }
741 
742  size_t hash_value(const path& __p) noexcept;
743 
744  /// @}
745 
746  /// Exception type thrown by the Filesystem library
748  {
749  public:
750  filesystem_error(const string& __what_arg, error_code __ec);
751 
752  filesystem_error(const string& __what_arg, const path& __p1,
753  error_code __ec);
754 
755  filesystem_error(const string& __what_arg, const path& __p1,
756  const path& __p2, error_code __ec);
757 
758  filesystem_error(const filesystem_error&) = default;
759  filesystem_error& operator=(const filesystem_error&) = default;
760 
761  // No move constructor or assignment operator.
762  // Copy rvalues instead, so that _M_impl is not left empty.
763 
764  ~filesystem_error();
765 
766  const path& path1() const noexcept;
767  const path& path2() const noexcept;
768  const char* what() const noexcept;
769 
770  private:
771  struct _Impl;
772  std::__shared_ptr<const _Impl> _M_impl;
773  };
774 
775  /// @cond undocumented
776 namespace __detail
777 {
778  [[noreturn]] inline void
779  __throw_conversion_error()
780  {
781  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
782  "Cannot convert character sequence",
783  std::make_error_code(errc::illegal_byte_sequence)));
784  }
785 
786 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
787  template<typename _Tp>
788  inline std::wstring
789  __wstr_from_utf8(const _Tp& __str)
790  {
791  static_assert(std::is_same_v<typename _Tp::value_type, char>);
792  std::wstring __wstr;
793  // XXX This assumes native wide encoding is UTF-16.
794  std::codecvt_utf8_utf16<wchar_t> __wcvt;
795  const auto __p = __str.data();
796  if (!__str_codecvt_in_all(__p, __p + __str.size(), __wstr, __wcvt))
797  __detail::__throw_conversion_error();
798  return __wstr;
799  }
800 #endif
801 
802 } // namespace __detail
803  /// @endcond
804 
805 
806  /** Create a path from a UTF-8-encoded sequence of char
807  *
808  * @relates std::filesystem::path
809  */
810  template<typename _InputIterator,
811  typename _Require = __detail::_Path2<_InputIterator>,
812  typename _CharT
813  = __detail::__value_type_is_char_or_char8_t<_InputIterator>>
814  inline path
815  u8path(_InputIterator __first, _InputIterator __last)
816  {
817 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
818  if constexpr (is_same_v<_CharT, char>)
819  return path{ __detail::__wstr_from_utf8(
820  __detail::__string_from_range(__first, __last)) };
821  else
822  return path{ __first, __last }; // constructor handles char8_t
823 #else
824  // This assumes native normal encoding is UTF-8.
825  return path{ __first, __last };
826 #endif
827  }
828 
829  /** Create a path from a UTF-8-encoded sequence of char
830  *
831  * @relates std::filesystem::path
832  */
833  template<typename _Source,
834  typename _Require = __detail::_Path<_Source>,
835  typename _CharT = __detail::__value_type_is_char_or_char8_t<_Source>>
836  inline path
837  u8path(const _Source& __source)
838  {
839 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
840  if constexpr (is_same_v<_CharT, char>)
841  return path{ __detail::__wstr_from_utf8(
842  __detail::__effective_range(__source)) };
843  else
844  return path{ __source }; // constructor handles char8_t
845 #else
846  // This assumes native normal encoding is UTF-8.
847  return path{ __source };
848 #endif
849  }
850 
851  /// @cond undocumented
852 
853  struct path::_Cmpt : path
854  {
855  _Cmpt(basic_string_view<value_type> __s, _Type __t, size_t __pos)
856  : path(__s, __t), _M_pos(__pos) { }
857 
858  _Cmpt() : _M_pos(-1) { }
859 
860  size_t _M_pos;
861  };
862 
863  // path::_Codecvt<C> Performs conversions between C and path::string_type.
864  // The native encoding of char strings is the OS-dependent current
865  // encoding for pathnames. FIXME: We assume this is UTF-8 everywhere,
866  // but should use a Windows API to query it.
867 
868  // Converts between native pathname encoding and char16_t or char32_t.
869  template<typename _EcharT>
870  struct path::_Codecvt
871  // Need derived class here because std::codecvt has protected destructor.
872  : std::codecvt<_EcharT, char, mbstate_t>
873  { };
874 
875  // Converts between native pathname encoding and native wide encoding.
876  // The native encoding for wide strings is the execution wide-character
877  // set encoding. FIXME: We assume that this is either UTF-32 or UTF-16
878  // (depending on the width of wchar_t). That matches GCC's default,
879  // but can be changed with -fwide-exec-charset.
880  // We need a custom codecvt converting the native pathname encoding
881  // to/from the native wide encoding.
882  template<>
883  struct path::_Codecvt<wchar_t>
884  : __conditional_t<sizeof(wchar_t) == sizeof(char32_t),
885  std::codecvt_utf8<wchar_t>, // UTF-8 <-> UTF-32
886  std::codecvt_utf8_utf16<wchar_t>> // UTF-8 <-> UTF-16
887  { };
888 
889  template<typename _EcharT>
890  auto
891  path::_S_convert(const _EcharT* __f, const _EcharT* __l)
892  {
893  static_assert(__detail::__is_encoded_char<_EcharT>);
894 
895 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
896 # define _GLIBCXX_CONV_FROM_UTF8(S) __detail::__wstr_from_utf8(S)
897 #else
898 # define _GLIBCXX_CONV_FROM_UTF8(S) S
899 #endif
900 
901  if constexpr (is_same_v<_EcharT, value_type>)
902  return basic_string_view<value_type>(__f, __l - __f);
903 #ifdef _GLIBCXX_USE_CHAR8_T
904  else if constexpr (is_same_v<_EcharT, char8_t>)
905  {
906  string_view __str(reinterpret_cast<const char*>(__f), __l - __f);
907  return _GLIBCXX_CONV_FROM_UTF8(__str);
908  }
909 #endif
910 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
911  else if constexpr (is_same_v<_EcharT, char>)
912  {
913  std::wstring __wstr;
914  path::_Codecvt<wchar_t> __cvt;
915  if (__str_codecvt_in_all(__f, __l, __wstr, __cvt))
916  return __wstr;
917  }
918 #endif
919  else
920  {
921  path::_Codecvt<_EcharT> __cvt;
922  std::string __str;
923  if (__str_codecvt_out_all(__f, __l, __str, __cvt))
924  return _GLIBCXX_CONV_FROM_UTF8(__str);
925  }
926  __detail::__throw_conversion_error();
927  }
928 #undef _GLIBCXX_CONV_FROM_UTF8
929 
930  /// @endcond
931 
932  /// An iterator for the components of a path
934  {
935  public:
936  using difference_type = std::ptrdiff_t;
937  using value_type = path;
938  using reference = const path&;
939  using pointer = const path*;
941 
942  iterator() noexcept : _M_path(nullptr), _M_cur(), _M_at_end() { }
943 
944  iterator(const iterator&) = default;
945  iterator& operator=(const iterator&) = default;
946 
947  reference operator*() const noexcept;
948  pointer operator->() const noexcept { return std::__addressof(**this); }
949 
950  iterator& operator++() noexcept;
951 
952  iterator operator++(int) noexcept
953  { auto __tmp = *this; ++*this; return __tmp; }
954 
955  iterator& operator--() noexcept;
956 
957  iterator operator--(int) noexcept
958  { auto __tmp = *this; --*this; return __tmp; }
959 
960  friend bool
961  operator==(const iterator& __lhs, const iterator& __rhs) noexcept
962  { return __lhs._M_equals(__rhs); }
963 
964  friend bool
965  operator!=(const iterator& __lhs, const iterator& __rhs) noexcept
966  { return !__lhs._M_equals(__rhs); }
967 
968  private:
969  friend class path;
970 
971  bool
972  _M_is_multi() const noexcept
973  { return _M_path->_M_type() == _Type::_Multi; }
974 
975  friend difference_type
976  __path_iter_distance(const iterator& __first, const iterator& __last)
977  noexcept
978  {
979  __glibcxx_assert(__first._M_path != nullptr);
980  __glibcxx_assert(__first._M_path == __last._M_path);
981  if (__first._M_is_multi())
982  return std::distance(__first._M_cur, __last._M_cur);
983  else if (__first._M_at_end == __last._M_at_end)
984  return 0;
985  else
986  return __first._M_at_end ? -1 : 1;
987  }
988 
989  friend void
990  __path_iter_advance(iterator& __i, difference_type __n) noexcept
991  {
992  if (__n == 1)
993  ++__i;
994  else if (__n == -1)
995  --__i;
996  else if (__n != 0)
997  {
998  __glibcxx_assert(__i._M_path != nullptr);
999  __glibcxx_assert(__i._M_is_multi());
1000  // __glibcxx_assert(__i._M_path->_M_cmpts.end() - __i._M_cur >= __n);
1001  __i._M_cur += __n;
1002  }
1003  }
1004 
1005  iterator(const path* __path, path::_List::const_iterator __iter) noexcept
1006  : _M_path(__path), _M_cur(__iter), _M_at_end()
1007  { }
1008 
1009  iterator(const path* __path, bool __at_end) noexcept
1010  : _M_path(__path), _M_cur(), _M_at_end(__at_end)
1011  { }
1012 
1013  bool _M_equals(iterator) const noexcept;
1014 
1015  const path* _M_path;
1016  path::_List::const_iterator _M_cur;
1017  bool _M_at_end; // only used when type != _Multi
1018  };
1019 
1020 
1021  inline path&
1022  path::operator=(path&& __p) noexcept
1023  {
1024  if (&__p == this) [[__unlikely__]]
1025  return *this;
1026 
1027  _M_pathname = std::move(__p._M_pathname);
1028  _M_cmpts = std::move(__p._M_cmpts);
1029  __p.clear();
1030  return *this;
1031  }
1032 
1033  inline path&
1034  path::operator=(string_type&& __source)
1035  { return *this = path(std::move(__source)); }
1036 
1037  inline path&
1038  path::assign(string_type&& __source)
1039  { return *this = path(std::move(__source)); }
1040 
1041  inline path&
1042  path::operator+=(const string_type& __x)
1043  {
1044  _M_concat(__x);
1045  return *this;
1046  }
1047 
1048  inline path&
1049  path::operator+=(const value_type* __x)
1050  {
1051  _M_concat(__x);
1052  return *this;
1053  }
1054 
1055  inline path&
1056  path::operator+=(value_type __x)
1057  {
1058  _M_concat(basic_string_view<value_type>(&__x, 1));
1059  return *this;
1060  }
1061 
1062  inline path&
1063  path::operator+=(basic_string_view<value_type> __x)
1064  {
1065  _M_concat(__x);
1066  return *this;
1067  }
1068 
1069  template<typename _CharT>
1070  inline __detail::_Path2<_CharT*>&
1071  path::operator+=(const _CharT __x)
1072  {
1073  _M_concat(_S_convert(&__x, &__x + 1));
1074  return *this;
1075  }
1076 
1077  inline path&
1078  path::make_preferred()
1079  {
1080 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1081  auto __pos = _M_pathname.find(L'/');
1082  while (__pos != _M_pathname.npos)
1083  {
1084  _M_pathname[__pos] = preferred_separator;
1085  __pos = _M_pathname.find(L'/', __pos);
1086  }
1087 #endif
1088  return *this;
1089  }
1090 
1091  inline void path::swap(path& __rhs) noexcept
1092  {
1093  _M_pathname.swap(__rhs._M_pathname);
1094  _M_cmpts.swap(__rhs._M_cmpts);
1095  }
1096 
1097  /// @cond undocumented
1098  template<typename _CharT, typename _Traits, typename _Allocator>
1100  path::_S_str_convert(basic_string_view<value_type> __str,
1101  const _Allocator& __a)
1102  {
1103  static_assert(!is_same_v<_CharT, value_type>);
1104 
1105  using _WString = basic_string<_CharT, _Traits, _Allocator>;
1106 
1107  if (__str.size() == 0)
1108  return _WString(__a);
1109 
1110 #ifndef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1111  string_view __u8str = __str;
1112 #else
1113  // First convert native string from UTF-16 to to UTF-8.
1114  // XXX This assumes that the execution wide-character set is UTF-16.
1115  std::codecvt_utf8_utf16<value_type> __cvt;
1116 
1117  using _CharAlloc = __alloc_rebind<_Allocator, char>;
1118  using _String = basic_string<char, char_traits<char>, _CharAlloc>;
1119  _String __u8str{_CharAlloc{__a}};
1120  const value_type* __wfirst = __str.data();
1121  const value_type* __wlast = __wfirst + __str.size();
1122  if (!__str_codecvt_out_all(__wfirst, __wlast, __u8str, __cvt))
1123  __detail::__throw_conversion_error();
1124  if constexpr (is_same_v<_CharT, char>)
1125  return __u8str; // XXX assumes native ordinary encoding is UTF-8.
1126  else
1127 #endif
1128  {
1129  const char* __first = __u8str.data();
1130  const char* __last = __first + __u8str.size();
1131 
1132  // Convert UTF-8 string to requested format.
1133 #ifdef _GLIBCXX_USE_CHAR8_T
1134  if constexpr (is_same_v<_CharT, char8_t>)
1135  return _WString(__first, __last, __a);
1136  else
1137 #endif
1138  {
1139  // Convert UTF-8 to wide string.
1140  _WString __wstr(__a);
1141  path::_Codecvt<_CharT> __cvt;
1142  if (__str_codecvt_in_all(__first, __last, __wstr, __cvt))
1143  return __wstr;
1144  }
1145  }
1146  __detail::__throw_conversion_error();
1147  }
1148  /// @endcond
1149 
1150  template<typename _CharT, typename _Traits, typename _Allocator>
1151  inline basic_string<_CharT, _Traits, _Allocator>
1152  path::string(const _Allocator& __a) const
1153  {
1154  if constexpr (is_same_v<_CharT, value_type>)
1155  return { _M_pathname.c_str(), _M_pathname.length(), __a };
1156  else
1157  return _S_str_convert<_CharT, _Traits>(_M_pathname, __a);
1158  }
1159 
1160  inline std::string
1161  path::string() const { return string<char>(); }
1162 
1163 #if _GLIBCXX_USE_WCHAR_T
1164  inline std::wstring
1165  path::wstring() const { return string<wchar_t>(); }
1166 #endif
1167 
1168 #ifdef _GLIBCXX_USE_CHAR8_T
1169  inline std::u8string
1170  path::u8string() const { return string<char8_t>(); }
1171 #else
1172  inline std::string
1173  path::u8string() const
1174  {
1175 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1176  std::string __str;
1177  // convert from native wide encoding (assumed to be UTF-16) to UTF-8
1178  std::codecvt_utf8_utf16<value_type> __cvt;
1179  const value_type* __first = _M_pathname.data();
1180  const value_type* __last = __first + _M_pathname.size();
1181  if (__str_codecvt_out_all(__first, __last, __str, __cvt))
1182  return __str;
1183  __detail::__throw_conversion_error();
1184 #else
1185  return _M_pathname;
1186 #endif
1187  }
1188 #endif // _GLIBCXX_USE_CHAR8_T
1189 
1190  inline std::u16string
1191  path::u16string() const { return string<char16_t>(); }
1192 
1193  inline std::u32string
1194  path::u32string() const { return string<char32_t>(); }
1195 
1196  template<typename _CharT, typename _Traits, typename _Allocator>
1198  path::generic_string(const _Allocator& __a) const
1199  {
1200 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1201  const value_type __slash = L'/';
1202 #else
1203  const value_type __slash = '/';
1204 #endif
1205  using _Alloc2 = typename allocator_traits<_Allocator>::template
1206  rebind_alloc<value_type>;
1207  basic_string<value_type, char_traits<value_type>, _Alloc2> __str(__a);
1208 
1209  if (_M_type() == _Type::_Root_dir)
1210  __str.assign(1, __slash);
1211  else
1212  {
1213  __str.reserve(_M_pathname.size());
1214  bool __add_slash = false;
1215  for (auto& __elem : *this)
1216  {
1217 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1218  if (__elem._M_type() == _Type::_Root_dir)
1219  {
1220  __str += __slash;
1221  continue;
1222  }
1223 #endif
1224  if (__add_slash)
1225  __str += __slash;
1226  __str += basic_string_view<value_type>(__elem._M_pathname);
1227  __add_slash = __elem._M_type() == _Type::_Filename;
1228  }
1229  }
1230 
1231  if constexpr (is_same_v<_CharT, value_type>)
1232  return __str;
1233  else
1234  return _S_str_convert<_CharT, _Traits>(__str, __a);
1235  }
1236 
1237  inline std::string
1238  path::generic_string() const
1239  { return generic_string<char>(); }
1240 
1241 #if _GLIBCXX_USE_WCHAR_T
1242  inline std::wstring
1243  path::generic_wstring() const
1244  { return generic_string<wchar_t>(); }
1245 #endif
1246 
1247 #ifdef _GLIBCXX_USE_CHAR8_T
1248  inline std::u8string
1249  path::generic_u8string() const
1250  { return generic_string<char8_t>(); }
1251 #else
1252  inline std::string
1253  path::generic_u8string() const
1254  { return generic_string(); }
1255 #endif
1256 
1257  inline std::u16string
1258  path::generic_u16string() const
1259  { return generic_string<char16_t>(); }
1260 
1261  inline std::u32string
1262  path::generic_u32string() const
1263  { return generic_string<char32_t>(); }
1264 
1265  inline int
1266  path::compare(const string_type& __s) const noexcept
1267  { return compare(basic_string_view<value_type>(__s)); }
1268 
1269  inline int
1270  path::compare(const value_type* __s) const noexcept
1271  { return compare(basic_string_view<value_type>(__s)); }
1272 
1273  inline path
1274  path::filename() const
1275  {
1276  if (empty())
1277  return {};
1278  else if (_M_type() == _Type::_Filename)
1279  return *this;
1280  else if (_M_type() == _Type::_Multi)
1281  {
1282  if (_M_pathname.back() == preferred_separator)
1283  return {};
1284  auto& __last = *--end();
1285  if (__last._M_type() == _Type::_Filename)
1286  return __last;
1287  }
1288  return {};
1289  }
1290 
1291  inline path
1292  path::stem() const
1293  {
1294  auto ext = _M_find_extension();
1295  if (ext.first && ext.second != 0)
1296  return path{ext.first->substr(0, ext.second)};
1297  return {};
1298  }
1299 
1300  inline path
1301  path::extension() const
1302  {
1303  auto ext = _M_find_extension();
1304  if (ext.first && ext.second != string_type::npos)
1305  return path{ext.first->substr(ext.second)};
1306  return {};
1307  }
1308 
1309  inline bool
1310  path::has_stem() const noexcept
1311  {
1312  auto ext = _M_find_extension();
1313  return ext.first && ext.second != 0;
1314  }
1315 
1316  inline bool
1317  path::has_extension() const noexcept
1318  {
1319  auto ext = _M_find_extension();
1320  return ext.first && ext.second != string_type::npos;
1321  }
1322 
1323  inline bool
1324  path::is_absolute() const noexcept
1325  {
1326 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1327  return has_root_name() && has_root_directory();
1328 #else
1329  return has_root_directory();
1330 #endif
1331  }
1332 
1333  inline path::iterator
1334  path::begin() const noexcept
1335  {
1336  if (_M_type() == _Type::_Multi)
1337  return iterator(this, _M_cmpts.begin());
1338  return iterator(this, empty());
1339  }
1340 
1341  inline path::iterator
1342  path::end() const noexcept
1343  {
1344  if (_M_type() == _Type::_Multi)
1345  return iterator(this, _M_cmpts.end());
1346  return iterator(this, true);
1347  }
1348 
1349  inline path::iterator&
1350  path::iterator::operator++() noexcept
1351  {
1352  __glibcxx_assert(_M_path != nullptr);
1353  if (_M_is_multi())
1354  {
1355  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end());
1356  ++_M_cur;
1357  }
1358  else
1359  {
1360  __glibcxx_assert(!_M_at_end);
1361  _M_at_end = true;
1362  }
1363  return *this;
1364  }
1365 
1366  inline path::iterator&
1367  path::iterator::operator--() noexcept
1368  {
1369  __glibcxx_assert(_M_path != nullptr);
1370  if (_M_is_multi())
1371  {
1372  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.begin());
1373  --_M_cur;
1374  }
1375  else
1376  {
1377  __glibcxx_assert(_M_at_end);
1378  _M_at_end = false;
1379  }
1380  return *this;
1381  }
1382 
1383  inline path::iterator::reference
1384  path::iterator::operator*() const noexcept
1385  {
1386  __glibcxx_assert(_M_path != nullptr);
1387  if (_M_is_multi())
1388  {
1389  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end());
1390  return *_M_cur;
1391  }
1392  return *_M_path;
1393  }
1394 
1395  inline bool
1396  path::iterator::_M_equals(iterator __rhs) const noexcept
1397  {
1398  if (_M_path != __rhs._M_path)
1399  return false;
1400  if (_M_path == nullptr)
1401  return true;
1402  if (_M_is_multi())
1403  return _M_cur == __rhs._M_cur;
1404  return _M_at_end == __rhs._M_at_end;
1405  }
1406 
1407  // Define this now that path and path::iterator are complete.
1408  // It needs to consider the string_view(Range&&) constructor during
1409  // overload resolution, which depends on whether range<path> is satisfied,
1410  // which depends on whether path::iterator is complete.
1411  inline int
1412  path::_S_compare(const path& __lhs, const path& __rhs) noexcept
1413  { return __lhs.compare(__rhs); }
1414 
1415  /// @} group filesystem
1416 _GLIBCXX_END_NAMESPACE_CXX11
1417 } // namespace filesystem
1418 
1419 /// @cond undocumented
1420 
1421 inline ptrdiff_t
1422 distance(filesystem::path::iterator __first, filesystem::path::iterator __last)
1423 noexcept
1424 { return __path_iter_distance(__first, __last); }
1425 
1426 template<typename _Distance>
1427  inline void
1428  advance(filesystem::path::iterator& __i, _Distance __n) noexcept
1429  { __path_iter_advance(__i, static_cast<ptrdiff_t>(__n)); }
1430 
1431 extern template class __shared_ptr<const filesystem::filesystem_error::_Impl>;
1432 
1433 /// @endcond
1434 
1435 // _GLIBCXX_RESOLVE_LIB_DEFECTS
1436 // 3657. std::hash<std::filesystem::path> is not enabled
1437 template<>
1438  struct hash<filesystem::path>
1439  {
1440  size_t
1441  operator()(const filesystem::path& __p) const noexcept
1442  { return filesystem::hash_value(__p); }
1443  };
1444 
1445 _GLIBCXX_END_NAMESPACE_VERSION
1446 } // namespace std
1447 
1448 #endif // C++17
1449 
1450 #endif // _GLIBCXX_FS_PATH_H
constexpr complex< _Tp > operator*(const complex< _Tp > &__x, const complex< _Tp > &__y)
Return new complex value x times y.
Definition: complex:392
path u8path(_InputIterator __first, _InputIterator __last)
Definition: bits/fs_path.h:815
path u8path(const _Source &__source)
Definition: bits/fs_path.h:837
integral_constant< bool, __v > bool_constant
Alias template for compile-time boolean constant types.
Definition: type_traits:98
void void_t
A metafunction that always yields void, used for detecting valid types.
Definition: type_traits:2636
integral_constant< bool, false > false_type
The type used as a compile-time boolean with false value.
Definition: type_traits:85
typename enable_if< _Cond, _Tp >::type enable_if_t
Alias template for enable_if.
Definition: type_traits:2614
constexpr _Tp * __addressof(_Tp &__r) noexcept
Same as C++11 std::addressof.
Definition: move.h:49
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
Definition: move.h:104
void swap(any &__x, any &__y) noexcept
Exchange the states of two any objects.
Definition: any:429
_Tp * end(valarray< _Tp > &__va) noexcept
Return an iterator pointing to one past the last element of the valarray.
Definition: valarray:1237
basic_string< char > string
A string of char.
Definition: stringfwd.h:72
basic_string< char32_t > u32string
A string of char32_t.
Definition: stringfwd.h:92
basic_string< char16_t > u16string
A string of char16_t.
Definition: stringfwd.h:89
basic_string< wchar_t > wstring
A string of wchar_t.
Definition: stringfwd.h:80
ISO C++ entities toplevel namespace is std.
constexpr iterator_traits< _InputIterator >::difference_type distance(_InputIterator __first, _InputIterator __last)
A generalization of pointer arithmetic.
constexpr auto empty(const _Container &__cont) noexcept(noexcept(__cont.empty())) -> decltype(__cont.empty())
Return whether a container is empty.
Definition: range_access.h:283
constexpr auto size(const _Container &__cont) noexcept(noexcept(__cont.size())) -> decltype(__cont.size())
Return the size of a container.
Definition: range_access.h:264
constexpr void advance(_InputIterator &__i, _Distance __n)
A generalization of pointer arithmetic.
auto quoted(const _CharT *__string, _CharT __delim=_CharT('"'), _CharT __escape = _CharT('\\'))
Manipulator for quoted strings.
Definition: iomanip:461
Template class basic_istream.
Definition: istream:59
Template class basic_ostream.
Definition: ostream:59
A non-owning reference to a string.
Definition: string_view:101
An exception type that includes an error_code value.
Definition: system_error:447
Primary class template codecvt.
Definition: codecvt.h:279
const _CharT * c_str() const noexcept
Return const pointer to null-terminated contents.
Definition: cow_string.h:2206
void reserve(size_type __res_arg)
Attempt to preallocate enough memory for specified number of characters.
Definition: cow_string.h:3422
basic_string & assign(const basic_string &__str)
Set value to contents of another string.
Definition: cow_string.h:3160
const _CharT * data() const noexcept
Return const pointer to contents.
Definition: cow_string.h:2218
void clear() noexcept
Definition: cow_string.h:1004
bool empty() const noexcept
Definition: cow_string.h:1026
Traits class for iterators.
A filesystem path.
Definition: bits/fs_path.h:293
friend bool operator!=(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:569
friend bool operator<=(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:577
friend bool operator>(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:581
friend path operator/(const path &__lhs, const path &__rhs)
Append one path to another.
Definition: bits/fs_path.h:590
format
path::format is ignored in this implementation
Definition: bits/fs_path.h:310
friend bool operator>=(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:585
friend bool operator<(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:573
friend std::basic_istream< _CharT, _Traits > & operator>>(std::basic_istream< _CharT, _Traits > &__is, path &__p)
Read a path from a stream.
Definition: bits/fs_path.h:548
friend bool operator==(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:559
Exception type thrown by the Filesystem library.
Definition: bits/fs_path.h:748
const char * what() const noexcept
An iterator for the components of a path.
Definition: bits/fs_path.h:934
Container class for localization functionality.
Bidirectional iterators support a superset of forward iterator operations.