libstdc++
bits/fs_path.h
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1 // Class filesystem::path -*- C++ -*-
2 
3 // Copyright (C) 2014-2021 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 /** @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 <utility>
36 #include <type_traits>
37 #include <locale>
38 #include <iosfwd>
39 #include <iomanip>
40 #include <codecvt>
41 #include <string_view>
42 #include <system_error>
43 #include <bits/stl_algobase.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 # include <algorithm>
56 #endif
57 
58 namespace std _GLIBCXX_VISIBILITY(default)
59 {
60 _GLIBCXX_BEGIN_NAMESPACE_VERSION
61 
62 namespace filesystem
63 {
64 _GLIBCXX_BEGIN_NAMESPACE_CXX11
65 
66  class path;
67 
68  /// @cond undocumented
69 namespace __detail
70 {
71  /// @addtogroup filesystem
72  /// @{
73  template<typename _CharT>
74  inline constexpr bool __is_encoded_char = false;
75  template<>
76  inline constexpr bool __is_encoded_char<char> = true;
77 #ifdef _GLIBCXX_USE_CHAR8_T
78  template<>
79  inline constexpr bool __is_encoded_char<char8_t> = true;
80 #endif
81 #if _GLIBCXX_USE_WCHAR_T
82  template<>
83  inline constexpr bool __is_encoded_char<wchar_t> = true;
84 #endif
85  template<>
86  inline constexpr bool __is_encoded_char<char16_t> = true;
87  template<>
88  inline constexpr bool __is_encoded_char<char32_t> = true;
89 
90 #if __cpp_concepts >= 201907L
91  template<typename _Iter>
92  using __safe_iterator_traits = std::iterator_traits<_Iter>;
93 #else
94  template<typename _Iter>
95  struct __safe_iterator_traits : std::iterator_traits<_Iter>
96  { };
97 
98  // Protect against ill-formed iterator_traits specializations in C++17
99  template<> struct __safe_iterator_traits<void*> { };
100  template<> struct __safe_iterator_traits<const void*> { };
101  template<> struct __safe_iterator_traits<volatile void*> { };
102  template<> struct __safe_iterator_traits<const volatile void*> { };
103 #endif
104 
105  template<typename _Iter_traits, typename = void>
106  struct __is_path_iter_src
107  : false_type
108  { };
109 
110  template<typename _Iter_traits>
111  struct __is_path_iter_src<_Iter_traits,
112  void_t<typename _Iter_traits::value_type>>
113  : bool_constant<__is_encoded_char<typename _Iter_traits::value_type>>
114  { };
115 
116  template<typename _Source>
117  inline constexpr bool __is_path_src
118  = __is_path_iter_src<iterator_traits<decay_t<_Source>>>::value;
119 
120  template<>
121  inline constexpr bool __is_path_src<path> = false;
122 
123  template<>
124  inline constexpr bool __is_path_src<volatile path> = false;
125 
126  template<>
127  inline constexpr bool __is_path_src<void*> = false;
128 
129  template<>
130  inline constexpr bool __is_path_src<const void*> = false;
131 
132  template<>
133  inline constexpr bool __is_path_src<volatile void*> = false;
134 
135  template<>
136  inline constexpr bool __is_path_src<const volatile void*> = false;
137 
138  template<typename _CharT, typename _Traits, typename _Alloc>
139  inline constexpr bool
140  __is_path_src<basic_string<_CharT, _Traits, _Alloc>>
141  = __is_encoded_char<_CharT>;
142 
143  template<typename _CharT, typename _Traits>
144  inline constexpr bool
145  __is_path_src<basic_string_view<_CharT, _Traits>>
146  = __is_encoded_char<_CharT>;
147 
148  // SFINAE constraint for Source parameters as required by [fs.path.req].
149  template<typename _Tp>
150  using _Path = enable_if_t<__is_path_src<_Tp>, path>;
151 
152  // SFINAE constraint for InputIterator parameters as required by [fs.req].
153  template<typename _Iter, typename _Tr = __safe_iterator_traits<_Iter>>
154  using _Path2 = enable_if_t<__is_path_iter_src<_Tr>::value, path>;
155 
156  // The __effective_range overloads convert a Source parameter into
157  // either a basic_string_view or basic_string containing the
158  // effective range of the Source, as defined in [fs.path.req].
159 
160  template<typename _CharT, typename _Traits, typename _Alloc>
161  inline basic_string_view<_CharT, _Traits>
162  __effective_range(const basic_string<_CharT, _Traits, _Alloc>& __source)
163  { return __source; }
164 
165  template<typename _CharT, typename _Traits>
166  inline const basic_string_view<_CharT, _Traits>&
167  __effective_range(const basic_string_view<_CharT, _Traits>& __source)
168  { return __source; }
169 
170  template<typename _Source>
171  inline auto
172  __effective_range(const _Source& __source)
173  {
174  if constexpr (is_pointer_v<decay_t<_Source>>)
175  return basic_string_view{&*__source};
176  else
177  {
178  // _Source is an input iterator that iterates over an NTCTS.
179  // Create a basic_string by reading until the null character.
180  using value_type
181  = typename iterator_traits<_Source>::value_type;
182  basic_string<value_type> __str;
183  _Source __it = __source;
184  for (value_type __ch = *__it; __ch != value_type(); __ch = *++__it)
185  __str.push_back(__ch);
186  return __str;
187  }
188  }
189 
190  // The value type of a Source parameter's effective range.
191  template<typename _Tp>
192  using __value_t = typename remove_reference_t<
193  decltype(__detail::__effective_range(std::declval<_Tp>()))>::value_type;
194 
195  // SFINAE helper to check that an effective range has value_type char,
196  // as required by path constructors taking a std::locale parameter.
197  // The type _Tp must have already been checked by _Path<Tp> or _Path2<_Tp>.
198  template<typename _Tp, typename _Val = __value_t<_Tp>>
199  using __value_type_is_char
201 
202  // As above, but also allows char8_t, as required by u8path
203  // C++20 [depr.fs.path.factory]
204  template<typename _Tp, typename _Val = __value_t<_Tp>>
205  using __value_type_is_char_or_char8_t
207 #ifdef _GLIBCXX_USE_CHAR8_T
208  || std::is_same_v<_Val, char8_t>
209 #endif
210  , _Val>;
211 
212  // Create a string or string view from an iterator range.
213  template<typename _InputIterator>
214  inline auto
215  __string_from_range(_InputIterator __first, _InputIterator __last)
216  {
217  using _EcharT
219  static_assert(__is_encoded_char<_EcharT>);
220 
221 #if __cpp_lib_concepts
222  constexpr bool __contiguous = std::contiguous_iterator<_InputIterator>;
223 #else
224  constexpr bool __contiguous
225  = is_pointer_v<decltype(std::__niter_base(__first))>;
226 #endif
227  if constexpr (__contiguous)
228  {
229  // For contiguous iterators we can just return a string view.
230  const auto* __f = std::__to_address(std::__niter_base(__first));
231  const auto* __l = std::__to_address(std::__niter_base(__last));
232  return basic_string_view<_EcharT>(__f, __l - __f);
233  }
234  else
235  // Conversion requires contiguous characters, so create a string.
236  return basic_string<_EcharT>(__first, __last);
237  }
238 
239  /// @} group filesystem
240 } // namespace __detail
241  /// @endcond
242 
243  /// @addtogroup filesystem
244  /// @{
245 
246  /// A filesystem path
247  /// @ingroup filesystem
248  class path
249  {
250  public:
251 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
252  using value_type = wchar_t;
253  static constexpr value_type preferred_separator = L'\\';
254 #else
255 # ifdef _GLIBCXX_DOXYGEN
256  /// Windows uses wchar_t for path::value_type, POSIX uses char.
257  using value_type = __os_dependent__;
258 # else
259  using value_type = char;
260 # endif
261  static constexpr value_type preferred_separator = '/';
262 #endif
264 
265  /// path::format is ignored in this implementation
266  enum format : unsigned char { native_format, generic_format, auto_format };
267 
268  // constructors and destructor
269 
270  path() noexcept { }
271 
272  path(const path& __p) = default;
273 
274  path(path&& __p)
275 #if _GLIBCXX_USE_CXX11_ABI || _GLIBCXX_FULLY_DYNAMIC_STRING == 0
276  noexcept
277 #endif
278  : _M_pathname(std::move(__p._M_pathname)),
279  _M_cmpts(std::move(__p._M_cmpts))
280  { __p.clear(); }
281 
282  path(string_type&& __source, format = auto_format)
283  : _M_pathname(std::move(__source))
284  { _M_split_cmpts(); }
285 
286  template<typename _Source,
287  typename _Require = __detail::_Path<_Source>>
288  path(_Source const& __source, format = auto_format)
289  : _M_pathname(_S_convert(__detail::__effective_range(__source)))
290  { _M_split_cmpts(); }
291 
292  template<typename _InputIterator,
293  typename _Require = __detail::_Path2<_InputIterator>>
294  path(_InputIterator __first, _InputIterator __last, format = auto_format)
295  : _M_pathname(_S_convert(__detail::__string_from_range(__first, __last)))
296  { _M_split_cmpts(); }
297 
298  template<typename _Source,
299  typename _Require = __detail::_Path<_Source>,
300  typename _Require2 = __detail::__value_type_is_char<_Source>>
301  path(_Source const& __src, const locale& __loc, format = auto_format)
302  : _M_pathname(_S_convert_loc(__detail::__effective_range(__src), __loc))
303  { _M_split_cmpts(); }
304 
305  template<typename _InputIterator,
306  typename _Require = __detail::_Path2<_InputIterator>,
307  typename _Req2 = __detail::__value_type_is_char<_InputIterator>>
308  path(_InputIterator __first, _InputIterator __last, const locale& __loc,
309  format = auto_format)
310  : _M_pathname(_S_convert_loc(__first, __last, __loc))
311  { _M_split_cmpts(); }
312 
313  ~path() = default;
314 
315  // assignments
316 
317  path& operator=(const path&);
318  path& operator=(path&&) noexcept;
319  path& operator=(string_type&& __source);
320  path& assign(string_type&& __source);
321 
322  template<typename _Source>
323  __detail::_Path<_Source>&
324  operator=(_Source const& __source)
325  { return *this = path(__source); }
326 
327  template<typename _Source>
328  __detail::_Path<_Source>&
329  assign(_Source const& __source)
330  { return *this = path(__source); }
331 
332  template<typename _InputIterator>
333  __detail::_Path2<_InputIterator>&
334  assign(_InputIterator __first, _InputIterator __last)
335  { return *this = path(__first, __last); }
336 
337  // appends
338 
339  path& operator/=(const path& __p);
340 
341  template<typename _Source>
342  __detail::_Path<_Source>&
343  operator/=(_Source const& __source)
344  {
345  _M_append(_S_convert(__detail::__effective_range(__source)));
346  return *this;
347  }
348 
349  template<typename _Source>
350  __detail::_Path<_Source>&
351  append(_Source const& __source)
352  {
353  _M_append(_S_convert(__detail::__effective_range(__source)));
354  return *this;
355  }
356 
357  template<typename _InputIterator>
358  __detail::_Path2<_InputIterator>&
359  append(_InputIterator __first, _InputIterator __last)
360  {
361  _M_append(_S_convert(__detail::__string_from_range(__first, __last)));
362  return *this;
363  }
364 
365  // concatenation
366 
367  path& operator+=(const path& __x);
368  path& operator+=(const string_type& __x);
369  path& operator+=(const value_type* __x);
370  path& operator+=(value_type __x);
371  path& operator+=(basic_string_view<value_type> __x);
372 
373  template<typename _Source>
374  __detail::_Path<_Source>&
375  operator+=(_Source const& __x) { return concat(__x); }
376 
377  template<typename _CharT>
378  __detail::_Path2<_CharT*>&
379  operator+=(_CharT __x);
380 
381  template<typename _Source>
382  __detail::_Path<_Source>&
383  concat(_Source const& __x)
384  {
385  _M_concat(_S_convert(__detail::__effective_range(__x)));
386  return *this;
387  }
388 
389  template<typename _InputIterator>
390  __detail::_Path2<_InputIterator>&
391  concat(_InputIterator __first, _InputIterator __last)
392  {
393  _M_concat(_S_convert(__detail::__string_from_range(__first, __last)));
394  return *this;
395  }
396 
397  // modifiers
398 
399  void clear() noexcept { _M_pathname.clear(); _M_split_cmpts(); }
400 
401  path& make_preferred();
402  path& remove_filename();
403  path& replace_filename(const path& __replacement);
404  path& replace_extension(const path& __replacement = path());
405 
406  void swap(path& __rhs) noexcept;
407 
408  // native format observers
409 
410  const string_type& native() const noexcept { return _M_pathname; }
411  const value_type* c_str() const noexcept { return _M_pathname.c_str(); }
412  operator string_type() const { return _M_pathname; }
413 
414  template<typename _CharT, typename _Traits = std::char_traits<_CharT>,
415  typename _Allocator = std::allocator<_CharT>>
417  string(const _Allocator& __a = _Allocator()) const;
418 
419  std::string string() const;
420 #if _GLIBCXX_USE_WCHAR_T
421  std::wstring wstring() const;
422 #endif
423 #ifdef _GLIBCXX_USE_CHAR8_T
424  __attribute__((__abi_tag__("__u8")))
425  std::u8string u8string() const;
426 #else
427  std::string u8string() const;
428 #endif // _GLIBCXX_USE_CHAR8_T
429  std::u16string u16string() const;
430  std::u32string u32string() const;
431 
432  // generic format observers
433  template<typename _CharT, typename _Traits = std::char_traits<_CharT>,
434  typename _Allocator = std::allocator<_CharT>>
436  generic_string(const _Allocator& __a = _Allocator()) const;
437 
438  std::string generic_string() const;
439 #if _GLIBCXX_USE_WCHAR_T
440  std::wstring generic_wstring() const;
441 #endif
442 #ifdef _GLIBCXX_USE_CHAR8_T
443  __attribute__((__abi_tag__("__u8")))
444  std::u8string generic_u8string() const;
445 #else
446  std::string generic_u8string() const;
447 #endif // _GLIBCXX_USE_CHAR8_T
448  std::u16string generic_u16string() const;
449  std::u32string generic_u32string() const;
450 
451  // compare
452 
453  int compare(const path& __p) const noexcept;
454  int compare(const string_type& __s) const noexcept;
455  int compare(const value_type* __s) const noexcept;
456  int compare(basic_string_view<value_type> __s) const noexcept;
457 
458  // decomposition
459 
460  path root_name() const;
461  path root_directory() const;
462  path root_path() const;
463  path relative_path() const;
464  path parent_path() const;
465  path filename() const;
466  path stem() const;
467  path extension() const;
468 
469  // query
470 
471  [[nodiscard]] bool empty() const noexcept { return _M_pathname.empty(); }
472  bool has_root_name() const noexcept;
473  bool has_root_directory() const noexcept;
474  bool has_root_path() const noexcept;
475  bool has_relative_path() const noexcept;
476  bool has_parent_path() const noexcept;
477  bool has_filename() const noexcept;
478  bool has_stem() const noexcept;
479  bool has_extension() const noexcept;
480  bool is_absolute() const noexcept;
481  bool is_relative() const noexcept { return !is_absolute(); }
482 
483  // generation
484  path lexically_normal() const;
485  path lexically_relative(const path& base) const;
486  path lexically_proximate(const path& base) const;
487 
488  // iterators
489  class iterator;
490  using const_iterator = iterator;
491 
492  iterator begin() const;
493  iterator end() const;
494 
495  /// Write a path to a stream
496  template<typename _CharT, typename _Traits>
499  {
500  __os << std::quoted(__p.string<_CharT, _Traits>());
501  return __os;
502  }
503 
504  /// Read a path from a stream
505  template<typename _CharT, typename _Traits>
508  {
510  if (__is >> std::quoted(__tmp))
511  __p = std::move(__tmp);
512  return __is;
513  }
514 
515  // non-member operators
516 
517  /// Compare paths
518  friend bool operator==(const path& __lhs, const path& __rhs) noexcept
519  { return path::_S_compare(__lhs, __rhs) == 0; }
520 
521 #if __cpp_lib_three_way_comparison
522  /// Compare paths
523  friend strong_ordering
524  operator<=>(const path& __lhs, const path& __rhs) noexcept
525  { return path::_S_compare(__lhs, __rhs) <=> 0; }
526 #else
527  /// Compare paths
528  friend bool operator!=(const path& __lhs, const path& __rhs) noexcept
529  { return !(__lhs == __rhs); }
530 
531  /// Compare paths
532  friend bool operator<(const path& __lhs, const path& __rhs) noexcept
533  { return __lhs.compare(__rhs) < 0; }
534 
535  /// Compare paths
536  friend bool operator<=(const path& __lhs, const path& __rhs) noexcept
537  { return !(__rhs < __lhs); }
538 
539  /// Compare paths
540  friend bool operator>(const path& __lhs, const path& __rhs) noexcept
541  { return __rhs < __lhs; }
542 
543  /// Compare paths
544  friend bool operator>=(const path& __lhs, const path& __rhs) noexcept
545  { return !(__lhs < __rhs); }
546 #endif
547 
548  /// Append one path to another
549  friend path operator/(const path& __lhs, const path& __rhs)
550  {
551  path __result(__lhs);
552  __result /= __rhs;
553  return __result;
554  }
555 
556  private:
557  enum class _Type : unsigned char {
558  _Multi = 0, _Root_name, _Root_dir, _Filename
559  };
560 
561  path(basic_string_view<value_type> __str, _Type __type);
562 
563  enum class _Split { _Stem, _Extension };
564 
565  void _M_append(basic_string_view<value_type>);
566  void _M_concat(basic_string_view<value_type>);
567 
568  pair<const string_type*, size_t> _M_find_extension() const noexcept;
569 
570  // path::_S_convert creates a basic_string<value_type> or
571  // basic_string_view<value_type> from a range (either the effective
572  // range of a Source parameter, or a pair of InputIterator parameters),
573  // performing the conversions required by [fs.path.type.cvt].
574  // If the value_type of the range value type is path::value_type,
575  // no encoding conversion is performed. If the range is contiguous
576  // a string_view
577 
578  static string_type
579  _S_convert(string_type __str)
580  { return __str; }
581 
582  template<typename _Tp>
583  static auto
584  _S_convert(const _Tp& __str)
585  {
586  if constexpr (is_same_v<_Tp, string_type>)
587  return __str;
588  else if constexpr (is_same_v<_Tp, basic_string_view<value_type>>)
589  return __str;
590  else if constexpr (is_same_v<typename _Tp::value_type, value_type>)
591  return basic_string_view<value_type>(__str.data(), __str.size());
592  else
593  return _S_convert(__str.data(), __str.data() + __str.size());
594  }
595 
596  template<typename _EcharT>
597  static auto
598  _S_convert(const _EcharT* __first, const _EcharT* __last);
599 
600  static string_type
601  _S_convert_loc(const char* __first, const char* __last,
602  const std::locale& __loc);
603 
604  template<typename _Iter>
605  static string_type
606  _S_convert_loc(_Iter __first, _Iter __last, const std::locale& __loc)
607  {
608  const auto __s = __detail::__string_from_range(__first, __last);
609  return _S_convert_loc(__s.data(), __s.data() + __s.size(), __loc);
610  }
611 
612  template<typename _Tp>
613  static string_type
614  _S_convert_loc(const _Tp& __s, const std::locale& __loc)
615  {
616  return _S_convert_loc(__s.data(), __s.data() + __s.size(), __loc);
617  }
618 
619  template<typename _CharT, typename _Traits, typename _Allocator>
620  static basic_string<_CharT, _Traits, _Allocator>
621  _S_str_convert(basic_string_view<value_type>, const _Allocator&);
622 
623  // Returns lhs.compare(rhs), but defined after path::iterator is complete.
624  __attribute__((__always_inline__))
625  static int
626  _S_compare(const path& __lhs, const path& __rhs) noexcept;
627 
628  void _M_split_cmpts();
629 
630  _Type _M_type() const noexcept { return _M_cmpts.type(); }
631 
632  string_type _M_pathname;
633 
634  struct _Cmpt;
635 
636  struct _List
637  {
638  using value_type = _Cmpt;
639  using iterator = value_type*;
640  using const_iterator = const value_type*;
641 
642  _List();
643  _List(const _List&);
644  _List(_List&&) = default;
645  _List& operator=(const _List&);
646  _List& operator=(_List&&) = default;
647  ~_List() = default;
648 
649  _Type type() const noexcept
650  { return _Type(reinterpret_cast<uintptr_t>(_M_impl.get()) & 0x3); }
651 
652  void type(_Type) noexcept;
653 
654  int size() const noexcept; // zero unless type() == _Type::_Multi
655  bool empty() const noexcept; // true unless type() == _Type::_Multi
656  void clear();
657  void swap(_List& __l) noexcept { _M_impl.swap(__l._M_impl); }
658  int capacity() const noexcept;
659  void reserve(int, bool); ///< @pre type() == _Type::_Multi
660 
661  // All the member functions below here have a precondition !empty()
662  // (and they should only be called from within the library).
663 
664  iterator begin() noexcept;
665  iterator end() noexcept;
666  const_iterator begin() const noexcept;
667  const_iterator end() const noexcept;
668 
669  value_type& front() noexcept;
670  value_type& back() noexcept;
671  const value_type& front() const noexcept;
672  const value_type& back() const noexcept;
673 
674  void pop_back();
675  void _M_erase_from(const_iterator __pos); // erases [__pos,end())
676 
677  struct _Impl;
678  struct _Impl_deleter
679  {
680  void operator()(_Impl*) const noexcept;
681  };
682  unique_ptr<_Impl, _Impl_deleter> _M_impl;
683  };
684  _List _M_cmpts;
685 
686  struct _Parser;
687 
688  template<typename _EcharT> struct _Codecvt;
689  };
690 
691  /// @{
692  /// @relates std::filesystem::path
693 
694  inline void swap(path& __lhs, path& __rhs) noexcept { __lhs.swap(__rhs); }
695 
696  size_t hash_value(const path& __p) noexcept;
697 
698  /// @}
699 
700  /// Exception type thrown by the Filesystem library
702  {
703  public:
704  filesystem_error(const string& __what_arg, error_code __ec);
705 
706  filesystem_error(const string& __what_arg, const path& __p1,
707  error_code __ec);
708 
709  filesystem_error(const string& __what_arg, const path& __p1,
710  const path& __p2, error_code __ec);
711 
712  filesystem_error(const filesystem_error&) = default;
713  filesystem_error& operator=(const filesystem_error&) = default;
714 
715  // No move constructor or assignment operator.
716  // Copy rvalues instead, so that _M_impl is not left empty.
717 
718  ~filesystem_error();
719 
720  const path& path1() const noexcept;
721  const path& path2() const noexcept;
722  const char* what() const noexcept;
723 
724  private:
725  struct _Impl;
726  std::__shared_ptr<const _Impl> _M_impl;
727  };
728 
729  /// @cond undocumented
730 namespace __detail
731 {
732  [[noreturn]] inline void
733  __throw_conversion_error()
734  {
735  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
736  "Cannot convert character sequence",
737  std::make_error_code(errc::illegal_byte_sequence)));
738  }
739 
740 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
741  template<typename _Tp>
742  inline std::wstring
743  __wstr_from_utf8(const _Tp& __str)
744  {
745  static_assert(std::is_same_v<typename _Tp::value_type, char>);
746  std::wstring __wstr;
747  // XXX This assumes native wide encoding is UTF-16.
748  std::codecvt_utf8_utf16<wchar_t> __wcvt;
749  const auto __p = __str.data();
750  if (!__str_codecvt_in_all(__p, __p + __str.size(), __wstr, __wcvt))
751  __detail::__throw_conversion_error();
752  return __wstr;
753  }
754 #endif
755 
756 } // namespace __detail
757  /// @endcond
758 
759 
760  /** Create a path from a UTF-8-encoded sequence of char
761  *
762  * @relates std::filesystem::path
763  */
764  template<typename _InputIterator,
765  typename _Require = __detail::_Path2<_InputIterator>,
766  typename _CharT
767  = __detail::__value_type_is_char_or_char8_t<_InputIterator>>
768  inline path
769  u8path(_InputIterator __first, _InputIterator __last)
770  {
771 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
772  if constexpr (is_same_v<_CharT, char>)
773  return path{ __detail::__wstr_from_utf8(
774  __detail::__string_from_range(__first, __last)) };
775  else
776  return path{ __first, __last }; // constructor handles char8_t
777 #else
778  // This assumes native normal encoding is UTF-8.
779  return path{ __first, __last };
780 #endif
781  }
782 
783  /** Create a path from a UTF-8-encoded sequence of char
784  *
785  * @relates std::filesystem::path
786  */
787  template<typename _Source,
788  typename _Require = __detail::_Path<_Source>,
789  typename _CharT = __detail::__value_type_is_char_or_char8_t<_Source>>
790  inline path
791  u8path(const _Source& __source)
792  {
793 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
794  if constexpr (is_same_v<_CharT, char>)
795  return path{ __detail::__wstr_from_utf8(
796  __detail::__effective_range(__source)) };
797  else
798  return path{ __source }; // constructor handles char8_t
799 #else
800  // This assumes native normal encoding is UTF-8.
801  return path{ __source };
802 #endif
803  }
804 
805  /// @cond undocumented
806 
807  struct path::_Cmpt : path
808  {
809  _Cmpt(basic_string_view<value_type> __s, _Type __t, size_t __pos);
810 
811  _Cmpt() : _M_pos(-1) { }
812 
813  size_t _M_pos;
814  };
815 
816  // path::_Codecvt<C> Performs conversions between C and path::string_type.
817  // The native encoding of char strings is the OS-dependent current
818  // encoding for pathnames. FIXME: We assume this is UTF-8 everywhere,
819  // but should use a Windows API to query it.
820 
821  // Converts between native pathname encoding and char16_t or char32_t.
822  template<typename _EcharT>
823  struct path::_Codecvt
824  // Need derived class here because std::codecvt has protected destructor.
825  : std::codecvt<_EcharT, char, mbstate_t>
826  { };
827 
828  // Converts between native pathname encoding and native wide encoding.
829  // The native encoding for wide strings is the execution wide-character
830  // set encoding. FIXME: We assume that this is either UTF-32 or UTF-16
831  // (depending on the width of wchar_t). That matches GCC's default,
832  // but can be changed with -fwide-exec-charset.
833  // We need a custom codecvt converting the native pathname encoding
834  // to/from the native wide encoding.
835  template<>
836  struct path::_Codecvt<wchar_t>
837  : conditional_t<sizeof(wchar_t) == sizeof(char32_t),
838  std::codecvt_utf8<wchar_t>, // UTF-8 <-> UTF-32
839  std::codecvt_utf8_utf16<wchar_t>> // UTF-8 <-> UTF-16
840  { };
841 
842  template<typename _EcharT>
843  auto
844  path::_S_convert(const _EcharT* __f, const _EcharT* __l)
845  {
846  static_assert(__detail::__is_encoded_char<_EcharT>);
847 
848 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
849 # define _GLIBCXX_CONV_FROM_UTF8(S) __detail::__wstr_from_utf8(S)
850 #else
851 # define _GLIBCXX_CONV_FROM_UTF8(S) S
852 #endif
853 
854  if constexpr (is_same_v<_EcharT, value_type>)
855  return basic_string_view<value_type>(__f, __l - __f);
856 #ifdef _GLIBCXX_USE_CHAR8_T
857  else if constexpr (is_same_v<_EcharT, char8_t>)
858  {
859  string_view __str(reinterpret_cast<const char*>(__f), __l - __f);
860  return _GLIBCXX_CONV_FROM_UTF8(__str);
861  }
862 #endif
863 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
864  else if constexpr (is_same_v<_EcharT, char>)
865  {
866  std::wstring __wstr;
867  path::_Codecvt<wchar_t> __cvt;
868  if (__str_codecvt_in_all(__f, __l, __wstr, __cvt))
869  return __wstr;
870  }
871 #endif
872  else
873  {
874  path::_Codecvt<_EcharT> __cvt;
875  std::string __str;
876  if (__str_codecvt_out_all(__f, __l, __str, __cvt))
877  return _GLIBCXX_CONV_FROM_UTF8(__str);
878  }
879  __detail::__throw_conversion_error();
880  }
881 #undef _GLIBCXX_CONV_FROM_UTF8
882 
883  /// @endcond
884 
885  /// An iterator for the components of a path
887  {
888  public:
889  using difference_type = std::ptrdiff_t;
890  using value_type = path;
891  using reference = const path&;
892  using pointer = const path*;
894 
895  iterator() : _M_path(nullptr), _M_cur(), _M_at_end() { }
896 
897  iterator(const iterator&) = default;
898  iterator& operator=(const iterator&) = default;
899 
900  reference operator*() const;
901  pointer operator->() const { return std::__addressof(**this); }
902 
903  iterator& operator++();
904  iterator operator++(int) { auto __tmp = *this; ++*this; return __tmp; }
905 
906  iterator& operator--();
907  iterator operator--(int) { auto __tmp = *this; --*this; return __tmp; }
908 
909  friend bool operator==(const iterator& __lhs, const iterator& __rhs)
910  { return __lhs._M_equals(__rhs); }
911 
912  friend bool operator!=(const iterator& __lhs, const iterator& __rhs)
913  { return !__lhs._M_equals(__rhs); }
914 
915  private:
916  friend class path;
917 
918  bool _M_is_multi() const { return _M_path->_M_type() == _Type::_Multi; }
919 
920  friend difference_type
921  __path_iter_distance(const iterator& __first, const iterator& __last)
922  {
923  __glibcxx_assert(__first._M_path != nullptr);
924  __glibcxx_assert(__first._M_path == __last._M_path);
925  if (__first._M_is_multi())
926  return std::distance(__first._M_cur, __last._M_cur);
927  else if (__first._M_at_end == __last._M_at_end)
928  return 0;
929  else
930  return __first._M_at_end ? -1 : 1;
931  }
932 
933  friend void
934  __path_iter_advance(iterator& __i, difference_type __n)
935  {
936  if (__n == 1)
937  ++__i;
938  else if (__n == -1)
939  --__i;
940  else if (__n != 0)
941  {
942  __glibcxx_assert(__i._M_path != nullptr);
943  __glibcxx_assert(__i._M_is_multi());
944  // __glibcxx_assert(__i._M_path->_M_cmpts.end() - __i._M_cur >= __n);
945  __i._M_cur += __n;
946  }
947  }
948 
949  iterator(const path* __path, path::_List::const_iterator __iter)
950  : _M_path(__path), _M_cur(__iter), _M_at_end()
951  { }
952 
953  iterator(const path* __path, bool __at_end)
954  : _M_path(__path), _M_cur(), _M_at_end(__at_end)
955  { }
956 
957  bool _M_equals(iterator) const;
958 
959  const path* _M_path;
960  path::_List::const_iterator _M_cur;
961  bool _M_at_end; // only used when type != _Multi
962  };
963 
964 
965  inline path&
966  path::operator=(path&& __p) noexcept
967  {
968  if (&__p == this) [[__unlikely__]]
969  return *this;
970 
971  _M_pathname = std::move(__p._M_pathname);
972  _M_cmpts = std::move(__p._M_cmpts);
973  __p.clear();
974  return *this;
975  }
976 
977  inline path&
978  path::operator=(string_type&& __source)
979  { return *this = path(std::move(__source)); }
980 
981  inline path&
982  path::assign(string_type&& __source)
983  { return *this = path(std::move(__source)); }
984 
985  inline path&
986  path::operator+=(const string_type& __x)
987  {
988  _M_concat(__x);
989  return *this;
990  }
991 
992  inline path&
993  path::operator+=(const value_type* __x)
994  {
995  _M_concat(__x);
996  return *this;
997  }
998 
999  inline path&
1000  path::operator+=(value_type __x)
1001  {
1002  _M_concat(basic_string_view<value_type>(&__x, 1));
1003  return *this;
1004  }
1005 
1006  inline path&
1007  path::operator+=(basic_string_view<value_type> __x)
1008  {
1009  _M_concat(__x);
1010  return *this;
1011  }
1012 
1013  template<typename _CharT>
1014  inline __detail::_Path2<_CharT*>&
1015  path::operator+=(const _CharT __x)
1016  {
1017  _M_concat(_S_convert(&__x, &__x + 1));
1018  return *this;
1019  }
1020 
1021  inline path&
1022  path::make_preferred()
1023  {
1024 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1025  std::replace(_M_pathname.begin(), _M_pathname.end(), L'/',
1026  preferred_separator);
1027 #endif
1028  return *this;
1029  }
1030 
1031  inline void path::swap(path& __rhs) noexcept
1032  {
1033  _M_pathname.swap(__rhs._M_pathname);
1034  _M_cmpts.swap(__rhs._M_cmpts);
1035  }
1036 
1037  /// @cond undocumented
1038  template<typename _CharT, typename _Traits, typename _Allocator>
1040  path::_S_str_convert(basic_string_view<value_type> __str,
1041  const _Allocator& __a)
1042  {
1043  static_assert(!is_same_v<_CharT, value_type>);
1044 
1045  using _WString = basic_string<_CharT, _Traits, _Allocator>;
1046 
1047  if (__str.size() == 0)
1048  return _WString(__a);
1049 
1050 #ifndef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1051  string_view __u8str = __str;
1052 #else
1053  // First convert native string from UTF-16 to to UTF-8.
1054  // XXX This assumes that the execution wide-character set is UTF-16.
1055  std::codecvt_utf8_utf16<value_type> __cvt;
1056 
1057  using _CharAlloc = __alloc_rebind<_Allocator, char>;
1058  using _String = basic_string<char, char_traits<char>, _CharAlloc>;
1059  _String __u8str{_CharAlloc{__a}};
1060  const value_type* __wfirst = __str.data();
1061  const value_type* __wlast = __wfirst + __str.size();
1062  if (!__str_codecvt_out_all(__wfirst, __wlast, __u8str, __cvt))
1063  __detail::__throw_conversion_error();
1064  if constexpr (is_same_v<_CharT, char>)
1065  return __u8str; // XXX assumes native ordinary encoding is UTF-8.
1066  else
1067 #endif
1068  {
1069  const char* __first = __u8str.data();
1070  const char* __last = __first + __u8str.size();
1071 
1072  // Convert UTF-8 string to requested format.
1073 #ifdef _GLIBCXX_USE_CHAR8_T
1074  if constexpr (is_same_v<_CharT, char8_t>)
1075  return _WString(__first, __last, __a);
1076  else
1077 #endif
1078  {
1079  // Convert UTF-8 to wide string.
1080  _WString __wstr(__a);
1081  path::_Codecvt<_CharT> __cvt;
1082  if (__str_codecvt_in_all(__first, __last, __wstr, __cvt))
1083  return __wstr;
1084  }
1085  }
1086  __detail::__throw_conversion_error();
1087  }
1088  /// @endcond
1089 
1090  template<typename _CharT, typename _Traits, typename _Allocator>
1091  inline basic_string<_CharT, _Traits, _Allocator>
1092  path::string(const _Allocator& __a) const
1093  {
1094  if constexpr (is_same_v<_CharT, value_type>)
1095  return { _M_pathname.c_str(), _M_pathname.length(), __a };
1096  else
1097  return _S_str_convert<_CharT, _Traits>(_M_pathname, __a);
1098  }
1099 
1100  inline std::string
1101  path::string() const { return string<char>(); }
1102 
1103 #if _GLIBCXX_USE_WCHAR_T
1104  inline std::wstring
1105  path::wstring() const { return string<wchar_t>(); }
1106 #endif
1107 
1108 #ifdef _GLIBCXX_USE_CHAR8_T
1109  inline std::u8string
1110  path::u8string() const { return string<char8_t>(); }
1111 #else
1112  inline std::string
1113  path::u8string() const
1114  {
1115 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1116  std::string __str;
1117  // convert from native wide encoding (assumed to be UTF-16) to UTF-8
1118  std::codecvt_utf8_utf16<value_type> __cvt;
1119  const value_type* __first = _M_pathname.data();
1120  const value_type* __last = __first + _M_pathname.size();
1121  if (__str_codecvt_out_all(__first, __last, __str, __cvt))
1122  return __str;
1123  __detail::__throw_conversion_error();
1124 #else
1125  return _M_pathname;
1126 #endif
1127  }
1128 #endif // _GLIBCXX_USE_CHAR8_T
1129 
1130  inline std::u16string
1131  path::u16string() const { return string<char16_t>(); }
1132 
1133  inline std::u32string
1134  path::u32string() const { return string<char32_t>(); }
1135 
1136  template<typename _CharT, typename _Traits, typename _Allocator>
1138  path::generic_string(const _Allocator& __a) const
1139  {
1140 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1141  const value_type __slash = L'/';
1142 #else
1143  const value_type __slash = '/';
1144 #endif
1145  using _Alloc2 = typename allocator_traits<_Allocator>::template
1146  rebind_alloc<value_type>;
1147  basic_string<value_type, char_traits<value_type>, _Alloc2> __str(__a);
1148 
1149  if (_M_type() == _Type::_Root_dir)
1150  __str.assign(1, __slash);
1151  else
1152  {
1153  __str.reserve(_M_pathname.size());
1154  bool __add_slash = false;
1155  for (auto& __elem : *this)
1156  {
1157 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1158  if (__elem._M_type() == _Type::_Root_dir)
1159  {
1160  __str += __slash;
1161  continue;
1162  }
1163 #endif
1164  if (__add_slash)
1165  __str += __slash;
1166  __str += basic_string_view<value_type>(__elem._M_pathname);
1167  __add_slash = __elem._M_type() == _Type::_Filename;
1168  }
1169  }
1170 
1171  if constexpr (is_same_v<_CharT, value_type>)
1172  return __str;
1173  else
1174  return _S_str_convert<_CharT, _Traits>(__str, __a);
1175  }
1176 
1177  inline std::string
1178  path::generic_string() const
1179  { return generic_string<char>(); }
1180 
1181 #if _GLIBCXX_USE_WCHAR_T
1182  inline std::wstring
1183  path::generic_wstring() const
1184  { return generic_string<wchar_t>(); }
1185 #endif
1186 
1187 #ifdef _GLIBCXX_USE_CHAR8_T
1188  inline std::u8string
1189  path::generic_u8string() const
1190  { return generic_string<char8_t>(); }
1191 #else
1192  inline std::string
1193  path::generic_u8string() const
1194  { return generic_string(); }
1195 #endif
1196 
1197  inline std::u16string
1198  path::generic_u16string() const
1199  { return generic_string<char16_t>(); }
1200 
1201  inline std::u32string
1202  path::generic_u32string() const
1203  { return generic_string<char32_t>(); }
1204 
1205  inline int
1206  path::compare(const string_type& __s) const noexcept
1207  { return compare(basic_string_view<value_type>(__s)); }
1208 
1209  inline int
1210  path::compare(const value_type* __s) const noexcept
1211  { return compare(basic_string_view<value_type>(__s)); }
1212 
1213  inline path
1214  path::filename() const
1215  {
1216  if (empty())
1217  return {};
1218  else if (_M_type() == _Type::_Filename)
1219  return *this;
1220  else if (_M_type() == _Type::_Multi)
1221  {
1222  if (_M_pathname.back() == preferred_separator)
1223  return {};
1224  auto __last = --end();
1225  if (__last->_M_type() == _Type::_Filename)
1226  return *__last;
1227  }
1228  return {};
1229  }
1230 
1231  inline path
1232  path::stem() const
1233  {
1234  auto ext = _M_find_extension();
1235  if (ext.first && ext.second != 0)
1236  return path{ext.first->substr(0, ext.second)};
1237  return {};
1238  }
1239 
1240  inline path
1241  path::extension() const
1242  {
1243  auto ext = _M_find_extension();
1244  if (ext.first && ext.second != string_type::npos)
1245  return path{ext.first->substr(ext.second)};
1246  return {};
1247  }
1248 
1249  inline bool
1250  path::has_stem() const noexcept
1251  {
1252  auto ext = _M_find_extension();
1253  return ext.first && ext.second != 0;
1254  }
1255 
1256  inline bool
1257  path::has_extension() const noexcept
1258  {
1259  auto ext = _M_find_extension();
1260  return ext.first && ext.second != string_type::npos;
1261  }
1262 
1263  inline bool
1264  path::is_absolute() const noexcept
1265  {
1266 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1267  return has_root_name() && has_root_directory();
1268 #else
1269  return has_root_directory();
1270 #endif
1271  }
1272 
1273  inline path::iterator
1274  path::begin() const
1275  {
1276  if (_M_type() == _Type::_Multi)
1277  return iterator(this, _M_cmpts.begin());
1278  return iterator(this, empty());
1279  }
1280 
1281  inline path::iterator
1282  path::end() const
1283  {
1284  if (_M_type() == _Type::_Multi)
1285  return iterator(this, _M_cmpts.end());
1286  return iterator(this, true);
1287  }
1288 
1289  inline path::iterator&
1290  path::iterator::operator++()
1291  {
1292  __glibcxx_assert(_M_path != nullptr);
1293  if (_M_path->_M_type() == _Type::_Multi)
1294  {
1295  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end());
1296  ++_M_cur;
1297  }
1298  else
1299  {
1300  __glibcxx_assert(!_M_at_end);
1301  _M_at_end = true;
1302  }
1303  return *this;
1304  }
1305 
1306  inline path::iterator&
1307  path::iterator::operator--()
1308  {
1309  __glibcxx_assert(_M_path != nullptr);
1310  if (_M_path->_M_type() == _Type::_Multi)
1311  {
1312  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.begin());
1313  --_M_cur;
1314  }
1315  else
1316  {
1317  __glibcxx_assert(_M_at_end);
1318  _M_at_end = false;
1319  }
1320  return *this;
1321  }
1322 
1323  inline path::iterator::reference
1325  {
1326  __glibcxx_assert(_M_path != nullptr);
1327  if (_M_path->_M_type() == _Type::_Multi)
1328  {
1329  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end());
1330  return *_M_cur;
1331  }
1332  return *_M_path;
1333  }
1334 
1335  inline bool
1336  path::iterator::_M_equals(iterator __rhs) const
1337  {
1338  if (_M_path != __rhs._M_path)
1339  return false;
1340  if (_M_path == nullptr)
1341  return true;
1342  if (_M_path->_M_type() == path::_Type::_Multi)
1343  return _M_cur == __rhs._M_cur;
1344  return _M_at_end == __rhs._M_at_end;
1345  }
1346 
1347  // Define this now that path and path::iterator are complete.
1348  // It needs to consider the string_view(Range&&) constructor during
1349  // overload resolution, which depends on whether range<path> is satisfied,
1350  // which depends on whether path::iterator is complete.
1351  inline int
1352  path::_S_compare(const path& __lhs, const path& __rhs) noexcept
1353  { return __lhs.compare(__rhs); }
1354 
1355  /// @} group filesystem
1356 _GLIBCXX_END_NAMESPACE_CXX11
1357 } // namespace filesystem
1358 
1359 /// @cond undocumented
1360 
1361 inline ptrdiff_t
1362 distance(filesystem::path::iterator __first, filesystem::path::iterator __last)
1363 { return __path_iter_distance(__first, __last); }
1364 
1365 template<typename _Distance>
1366  void
1367  advance(filesystem::path::iterator& __i, _Distance __n)
1368  { __path_iter_advance(__i, static_cast<ptrdiff_t>(__n)); }
1369 
1370 extern template class __shared_ptr<const filesystem::filesystem_error::_Impl>;
1371 
1372 /// @endcond
1373 
1374 // _GLIBCXX_RESOLVE_LIB_DEFECTS
1375 // 3657. std::hash<std::filesystem::path> is not enabled
1376 template<>
1377  struct hash<filesystem::path>
1378  {
1379  size_t
1380  operator()(const filesystem::path& __p) const noexcept
1381  { return filesystem::hash_value(__p); }
1382  };
1383 
1384 _GLIBCXX_END_NAMESPACE_VERSION
1385 } // namespace std
1386 
1387 #endif // C++17
1388 
1389 #endif // _GLIBCXX_FS_PATH_H
constexpr duration< __common_rep_t< _Rep2, _Rep1 >, _Period > operator*(const _Rep1 &__s, const duration< _Rep2, _Period > &__d)
Definition: chrono:700
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:769
path u8path(const _Source &__source)
Definition: bits/fs_path.h:791
typename remove_reference< _Tp >::type remove_reference_t
Alias template for remove_reference.
Definition: type_traits:1639
integral_constant< bool, __v > bool_constant
Alias template for compile-time boolean constant types.
Definition: type_traits:99
void void_t
A metafunction that always yields void, used for detecting valid types.
Definition: type_traits:2601
typename conditional< _Cond, _Iftrue, _Iffalse >::type conditional_t
Alias template for conditional.
Definition: type_traits:2583
integral_constant< bool, false > false_type
The type used as a compile-time boolean with false value.
Definition: type_traits:86
typename enable_if< _Cond, _Tp >::type enable_if_t
Alias template for enable_if.
Definition: type_traits:2579
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:428
_Tp * end(valarray< _Tp > &__va) noexcept
Return an iterator pointing to one past the last element of the valarray.
Definition: valarray:1239
_Tp * begin(valarray< _Tp > &__va) noexcept
Return an iterator pointing to the first element of the valarray.
Definition: valarray:1217
basic_string< char > string
A string of char.
Definition: stringfwd.h:74
basic_string< char32_t > u32string
A string of char32_t.
Definition: stringfwd.h:96
basic_string< char16_t > u16string
A string of char16_t.
Definition: stringfwd.h:93
basic_string< wchar_t > wstring
A string of wchar_t.
Definition: stringfwd.h:83
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:263
constexpr auto size(const _Container &__cont) noexcept(noexcept(__cont.size())) -> decltype(__cont.size())
Return the size of a container.
Definition: range_access.h:245
constexpr void advance(_InputIterator &__i, _Distance __n)
A generalization of pointer arithmetic.
constexpr auto data(_Container &__cont) noexcept(noexcept(__cont.data())) -> decltype(__cont.data())
Return the data pointer of a container.
Definition: range_access.h:290
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:99
An exception type that includes an error_code value.
Definition: system_error:447
const _CharT * c_str() const noexcept
Return const pointer to null-terminated contents.
void reserve(size_type __res_arg)
Attempt to preallocate enough memory for specified number of characters.
basic_string & assign(const basic_string &__str)
Set value to contents of another string.
const _CharT * data() const noexcept
Return const pointer to contents.
void clear() noexcept
bool empty() const noexcept
static const size_type npos
Value returned by various member functions when they fail.
Primary class template codecvt.
Definition: codecvt.h:279
Traits class for iterators.
A filesystem path.
Definition: bits/fs_path.h:249
friend bool operator!=(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:528
friend bool operator<=(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:536
friend std::basic_ostream< _CharT, _Traits > & operator<<(std::basic_ostream< _CharT, _Traits > &__os, const path &__p)
Write a path to a stream.
Definition: bits/fs_path.h:498
friend bool operator>(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:540
friend path operator/(const path &__lhs, const path &__rhs)
Append one path to another.
Definition: bits/fs_path.h:549
format
path::format is ignored in this implementation
Definition: bits/fs_path.h:266
friend bool operator>=(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:544
friend bool operator<(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:532
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:507
friend bool operator==(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:518
Exception type thrown by the Filesystem library.
Definition: bits/fs_path.h:702
const char * what() const noexcept
An iterator for the components of a path.
Definition: bits/fs_path.h:887
Container class for localization functionality.
Bidirectional iterators support a superset of forward iterator operations.