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>
498  operator<<(std::basic_ostream<_CharT, _Traits>& __os, const path& __p)
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  : _M_pathname(__str)
563  {
564  __glibcxx_assert(__type != _Type::_Multi);
565  _M_cmpts.type(__type);
566  }
567 
568  enum class _Split { _Stem, _Extension };
569 
570  void _M_append(basic_string_view<value_type>);
571  void _M_concat(basic_string_view<value_type>);
572 
573  pair<const string_type*, size_t> _M_find_extension() const noexcept;
574 
575  // path::_S_convert creates a basic_string<value_type> or
576  // basic_string_view<value_type> from a range (either the effective
577  // range of a Source parameter, or a pair of InputIterator parameters),
578  // performing the conversions required by [fs.path.type.cvt].
579  // If the value_type of the range value type is path::value_type,
580  // no encoding conversion is performed. If the range is contiguous
581  // a string_view
582 
583  static string_type
584  _S_convert(string_type __str)
585  { return __str; }
586 
587  template<typename _Tp>
588  static auto
589  _S_convert(const _Tp& __str)
590  {
591  if constexpr (is_same_v<_Tp, string_type>)
592  return __str;
593  else if constexpr (is_same_v<_Tp, basic_string_view<value_type>>)
594  return __str;
595  else if constexpr (is_same_v<typename _Tp::value_type, value_type>)
596  return basic_string_view<value_type>(__str.data(), __str.size());
597  else
598  return _S_convert(__str.data(), __str.data() + __str.size());
599  }
600 
601  template<typename _EcharT>
602  static auto
603  _S_convert(const _EcharT* __first, const _EcharT* __last);
604 
605  static string_type
606  _S_convert_loc(const char* __first, const char* __last,
607  const std::locale& __loc);
608 
609  template<typename _Iter>
610  static string_type
611  _S_convert_loc(_Iter __first, _Iter __last, const std::locale& __loc)
612  {
613  const auto __s = __detail::__string_from_range(__first, __last);
614  return _S_convert_loc(__s.data(), __s.data() + __s.size(), __loc);
615  }
616 
617  template<typename _Tp>
618  static string_type
619  _S_convert_loc(const _Tp& __s, const std::locale& __loc)
620  {
621  return _S_convert_loc(__s.data(), __s.data() + __s.size(), __loc);
622  }
623 
624  template<typename _CharT, typename _Traits, typename _Allocator>
625  static basic_string<_CharT, _Traits, _Allocator>
626  _S_str_convert(basic_string_view<value_type>, const _Allocator&);
627 
628  // Returns lhs.compare(rhs), but defined after path::iterator is complete.
629  __attribute__((__always_inline__))
630  static int
631  _S_compare(const path& __lhs, const path& __rhs) noexcept;
632 
633  void _M_split_cmpts();
634 
635  _Type _M_type() const noexcept { return _M_cmpts.type(); }
636 
637  string_type _M_pathname;
638 
639  struct _Cmpt;
640 
641  struct _List
642  {
643  using value_type = _Cmpt;
644  using iterator = value_type*;
645  using const_iterator = const value_type*;
646 
647  _List();
648  _List(const _List&);
649  _List(_List&&) = default;
650  _List& operator=(const _List&);
651  _List& operator=(_List&&) = default;
652  ~_List() = default;
653 
654  _Type type() const noexcept
655  { return _Type(reinterpret_cast<uintptr_t>(_M_impl.get()) & 0x3); }
656 
657  void type(_Type) noexcept;
658 
659  int size() const noexcept; // zero unless type() == _Type::_Multi
660  bool empty() const noexcept; // true unless type() == _Type::_Multi
661  void clear();
662  void swap(_List& __l) noexcept { _M_impl.swap(__l._M_impl); }
663  int capacity() const noexcept;
664  void reserve(int, bool); ///< @pre type() == _Type::_Multi
665 
666  // All the member functions below here have a precondition !empty()
667  // (and they should only be called from within the library).
668 
669  iterator begin() noexcept;
670  iterator end() noexcept;
671  const_iterator begin() const noexcept;
672  const_iterator end() const noexcept;
673 
674  value_type& front() noexcept;
675  value_type& back() noexcept;
676  const value_type& front() const noexcept;
677  const value_type& back() const noexcept;
678 
679  void pop_back();
680  void _M_erase_from(const_iterator __pos); // erases [__pos,end())
681 
682  struct _Impl;
683  struct _Impl_deleter
684  {
685  void operator()(_Impl*) const noexcept;
686  };
687  unique_ptr<_Impl, _Impl_deleter> _M_impl;
688  };
689  _List _M_cmpts;
690 
691  struct _Parser;
692  };
693 
694  /// @{
695  /// @relates std::filesystem::path
696 
697  inline void swap(path& __lhs, path& __rhs) noexcept { __lhs.swap(__rhs); }
698 
699  size_t hash_value(const path& __p) noexcept;
700 
701  /// @}
702 
703  /// Exception type thrown by the Filesystem library
705  {
706  public:
707  filesystem_error(const string& __what_arg, error_code __ec);
708 
709  filesystem_error(const string& __what_arg, const path& __p1,
710  error_code __ec);
711 
712  filesystem_error(const string& __what_arg, const path& __p1,
713  const path& __p2, error_code __ec);
714 
715  filesystem_error(const filesystem_error&) = default;
716  filesystem_error& operator=(const filesystem_error&) = default;
717 
718  // No move constructor or assignment operator.
719  // Copy rvalues instead, so that _M_impl is not left empty.
720 
721  ~filesystem_error();
722 
723  const path& path1() const noexcept;
724  const path& path2() const noexcept;
725  const char* what() const noexcept;
726 
727  private:
728  struct _Impl;
729  std::__shared_ptr<const _Impl> _M_impl;
730  };
731 
732  /// @cond undocumented
733 namespace __detail
734 {
735  [[noreturn]] inline void
736  __throw_conversion_error()
737  {
738  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
739  "Cannot convert character sequence",
740  std::make_error_code(errc::illegal_byte_sequence)));
741  }
742 
743 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
744  template<typename _Tp>
745  inline std::wstring
746  __wstr_from_utf8(const _Tp& __str)
747  {
748  static_assert(std::is_same_v<typename _Tp::value_type, char>);
749  std::wstring __wstr;
750  // XXX This assumes native wide encoding is UTF-16.
751  std::codecvt_utf8_utf16<wchar_t> __wcvt;
752  const auto __p = __str.data();
753  if (!__str_codecvt_in_all(__p, __p + __str.size(), __wstr, __wcvt))
754  __detail::__throw_conversion_error();
755  return __wstr;
756  }
757 #endif
758 
759 } // namespace __detail
760  /// @endcond
761 
762 
763  /** Create a path from a UTF-8-encoded sequence of char
764  *
765  * @relates std::filesystem::path
766  */
767  template<typename _InputIterator,
768  typename _Require = __detail::_Path2<_InputIterator>,
769  typename _CharT
770  = __detail::__value_type_is_char_or_char8_t<_InputIterator>>
771  inline path
772  u8path(_InputIterator __first, _InputIterator __last)
773  {
774 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
775  if constexpr (is_same_v<_CharT, char>)
776  return path{ __detail::__wstr_from_utf8(
777  __detail::__string_from_range(__first, __last)) };
778  else
779  return path{ __first, __last }; // constructor handles char8_t
780 #else
781  // This assumes native normal encoding is UTF-8.
782  return path{ __first, __last };
783 #endif
784  }
785 
786  /** Create a path from a UTF-8-encoded sequence of char
787  *
788  * @relates std::filesystem::path
789  */
790  template<typename _Source,
791  typename _Require = __detail::_Path<_Source>,
792  typename _CharT = __detail::__value_type_is_char_or_char8_t<_Source>>
793  inline path
794  u8path(const _Source& __source)
795  {
796 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
797  if constexpr (is_same_v<_CharT, char>)
798  return path{ __detail::__wstr_from_utf8(
799  __detail::__effective_range(__source)) };
800  else
801  return path{ __source }; // constructor handles char8_t
802 #else
803  // This assumes native normal encoding is UTF-8.
804  return path{ __source };
805 #endif
806  }
807 
808  /// @cond undocumented
809 
810  struct path::_Cmpt : path
811  {
812  _Cmpt(basic_string_view<value_type> __s, _Type __t, size_t __pos)
813  : path(__s, __t), _M_pos(__pos) { }
814 
815  _Cmpt() : _M_pos(-1) { }
816 
817  size_t _M_pos;
818  };
819 
820  template<typename _EcharT>
821  auto
822  path::_S_convert(const _EcharT* __f, const _EcharT* __l)
823  {
824  static_assert(__detail::__is_encoded_char<_EcharT>);
825 
826  if constexpr (is_same_v<_EcharT, value_type>)
827  return basic_string_view<value_type>(__f, __l - __f);
828 #if !defined _GLIBCXX_FILESYSTEM_IS_WINDOWS && defined _GLIBCXX_USE_CHAR8_T
829  else if constexpr (is_same_v<_EcharT, char8_t>)
830  // For POSIX converting from char8_t to char is also 'noconv'
831  return string_view(reinterpret_cast<const char*>(__f), __l - __f);
832 #endif
833  else
834  {
835 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
836  std::wstring __wstr;
837  if constexpr (is_same_v<_EcharT, char>)
838  {
839  struct _UCvt : std::codecvt<wchar_t, char, std::mbstate_t>
840  { } __cvt;
841  if (__str_codecvt_in_all(__f, __l, __wstr, __cvt))
842  return __wstr;
843  }
844 #ifdef _GLIBCXX_USE_CHAR8_T
845  else if constexpr (is_same_v<_EcharT, char8_t>)
846  {
847  const auto __f2 = reinterpret_cast<const char*>(__f);
848  return __detail::__wstr_from_utf8(string_view(__f2, __l - __f));
849  }
850 #endif
851  else // char16_t or char32_t
852  {
853  struct _UCvt : std::codecvt<_EcharT, char, std::mbstate_t>
854  { } __cvt;
855  std::string __str;
856  if (__str_codecvt_out_all(__f, __l, __str, __cvt))
857  return __detail::__wstr_from_utf8(__str);
858  }
859 #else // ! windows
860  struct _UCvt : std::codecvt<_EcharT, char, std::mbstate_t>
861  { } __cvt;
862  std::string __str;
863  if (__str_codecvt_out_all(__f, __l, __str, __cvt))
864  return __str;
865 #endif
866  __detail::__throw_conversion_error();
867  }
868  }
869 
870  /// @endcond
871 
872  /// An iterator for the components of a path
874  {
875  public:
876  using difference_type = std::ptrdiff_t;
877  using value_type = path;
878  using reference = const path&;
879  using pointer = const path*;
881 
882  iterator() : _M_path(nullptr), _M_cur(), _M_at_end() { }
883 
884  iterator(const iterator&) = default;
885  iterator& operator=(const iterator&) = default;
886 
887  reference operator*() const;
888  pointer operator->() const { return std::__addressof(**this); }
889 
890  iterator& operator++();
891  iterator operator++(int) { auto __tmp = *this; ++*this; return __tmp; }
892 
893  iterator& operator--();
894  iterator operator--(int) { auto __tmp = *this; --*this; return __tmp; }
895 
896  friend bool operator==(const iterator& __lhs, const iterator& __rhs)
897  { return __lhs._M_equals(__rhs); }
898 
899  friend bool operator!=(const iterator& __lhs, const iterator& __rhs)
900  { return !__lhs._M_equals(__rhs); }
901 
902  private:
903  friend class path;
904 
905  bool _M_is_multi() const { return _M_path->_M_type() == _Type::_Multi; }
906 
907  friend difference_type
908  __path_iter_distance(const iterator& __first, const iterator& __last)
909  {
910  __glibcxx_assert(__first._M_path != nullptr);
911  __glibcxx_assert(__first._M_path == __last._M_path);
912  if (__first._M_is_multi())
913  return std::distance(__first._M_cur, __last._M_cur);
914  else if (__first._M_at_end == __last._M_at_end)
915  return 0;
916  else
917  return __first._M_at_end ? -1 : 1;
918  }
919 
920  friend void
921  __path_iter_advance(iterator& __i, difference_type __n)
922  {
923  if (__n == 1)
924  ++__i;
925  else if (__n == -1)
926  --__i;
927  else if (__n != 0)
928  {
929  __glibcxx_assert(__i._M_path != nullptr);
930  __glibcxx_assert(__i._M_is_multi());
931  // __glibcxx_assert(__i._M_path->_M_cmpts.end() - __i._M_cur >= __n);
932  __i._M_cur += __n;
933  }
934  }
935 
936  iterator(const path* __path, path::_List::const_iterator __iter)
937  : _M_path(__path), _M_cur(__iter), _M_at_end()
938  { }
939 
940  iterator(const path* __path, bool __at_end)
941  : _M_path(__path), _M_cur(), _M_at_end(__at_end)
942  { }
943 
944  bool _M_equals(iterator) const;
945 
946  const path* _M_path;
947  path::_List::const_iterator _M_cur;
948  bool _M_at_end; // only used when type != _Multi
949  };
950 
951 
952  inline path&
953  path::operator=(path&& __p) noexcept
954  {
955  if (&__p == this) [[__unlikely__]]
956  return *this;
957 
958  _M_pathname = std::move(__p._M_pathname);
959  _M_cmpts = std::move(__p._M_cmpts);
960  __p.clear();
961  return *this;
962  }
963 
964  inline path&
965  path::operator=(string_type&& __source)
966  { return *this = path(std::move(__source)); }
967 
968  inline path&
969  path::assign(string_type&& __source)
970  { return *this = path(std::move(__source)); }
971 
972  inline path&
973  path::operator+=(const string_type& __x)
974  {
975  _M_concat(__x);
976  return *this;
977  }
978 
979  inline path&
980  path::operator+=(const value_type* __x)
981  {
982  _M_concat(__x);
983  return *this;
984  }
985 
986  inline path&
987  path::operator+=(value_type __x)
988  {
989  _M_concat(basic_string_view<value_type>(&__x, 1));
990  return *this;
991  }
992 
993  inline path&
994  path::operator+=(basic_string_view<value_type> __x)
995  {
996  _M_concat(__x);
997  return *this;
998  }
999 
1000  template<typename _CharT>
1001  inline __detail::_Path2<_CharT*>&
1002  path::operator+=(const _CharT __x)
1003  {
1004  _M_concat(_S_convert(&__x, &__x + 1));
1005  return *this;
1006  }
1007 
1008  inline path&
1009  path::make_preferred()
1010  {
1011 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1012  std::replace(_M_pathname.begin(), _M_pathname.end(), L'/',
1013  preferred_separator);
1014 #endif
1015  return *this;
1016  }
1017 
1018  inline void path::swap(path& __rhs) noexcept
1019  {
1020  _M_pathname.swap(__rhs._M_pathname);
1021  _M_cmpts.swap(__rhs._M_cmpts);
1022  }
1023 
1024  /// @cond undocumented
1025  template<typename _CharT, typename _Traits, typename _Allocator>
1027  path::_S_str_convert(basic_string_view<value_type> __str,
1028  const _Allocator& __a)
1029  {
1030  static_assert(!is_same_v<_CharT, value_type>);
1031 
1032  using _WString = basic_string<_CharT, _Traits, _Allocator>;
1033 
1034  if (__str.size() == 0)
1035  return _WString(__a);
1036 
1037 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1038  // First convert native string from UTF-16 to to UTF-8.
1039  // XXX This assumes that the execution wide-character set is UTF-16.
1040  std::codecvt_utf8_utf16<value_type> __cvt;
1041 
1042  using _CharAlloc = __alloc_rebind<_Allocator, char>;
1043  using _String = basic_string<char, char_traits<char>, _CharAlloc>;
1044  _String __u8str{_CharAlloc{__a}};
1045  const value_type* __wfirst = __str.data();
1046  const value_type* __wlast = __wfirst + __str.size();
1047  if (__str_codecvt_out_all(__wfirst, __wlast, __u8str, __cvt)) {
1048  if constexpr (is_same_v<_CharT, char>)
1049  return __u8str; // XXX assumes native ordinary encoding is UTF-8.
1050  else {
1051 
1052  const char* __first = __u8str.data();
1053  const char* __last = __first + __u8str.size();
1054 #else
1055  const value_type* __first = __str.data();
1056  const value_type* __last = __first + __str.size();
1057 #endif
1058 
1059  // Convert UTF-8 string to requested format.
1060 #ifdef _GLIBCXX_USE_CHAR8_T
1061  if constexpr (is_same_v<_CharT, char8_t>)
1062  return _WString(__first, __last, __a);
1063  else
1064 #endif
1065  {
1066  // Convert UTF-8 to wide string.
1067  _WString __wstr(__a);
1068  struct _UCvt : std::codecvt<_CharT, char, std::mbstate_t> { } __cvt;
1069  if (__str_codecvt_in_all(__first, __last, __wstr, __cvt))
1070  return __wstr;
1071  }
1072 
1073 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1074  } }
1075 #endif
1076  __detail::__throw_conversion_error();
1077  }
1078  /// @endcond
1079 
1080  template<typename _CharT, typename _Traits, typename _Allocator>
1081  inline basic_string<_CharT, _Traits, _Allocator>
1082  path::string(const _Allocator& __a) const
1083  {
1084  if constexpr (is_same_v<_CharT, value_type>)
1085  return { _M_pathname.c_str(), _M_pathname.length(), __a };
1086  else
1087  return _S_str_convert<_CharT, _Traits>(_M_pathname, __a);
1088  }
1089 
1090  inline std::string
1091  path::string() const { return string<char>(); }
1092 
1093 #if _GLIBCXX_USE_WCHAR_T
1094  inline std::wstring
1095  path::wstring() const { return string<wchar_t>(); }
1096 #endif
1097 
1098 #ifdef _GLIBCXX_USE_CHAR8_T
1099  inline std::u8string
1100  path::u8string() const { return string<char8_t>(); }
1101 #else
1102  inline std::string
1103  path::u8string() const
1104  {
1105 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1106  std::string __str;
1107  // convert from native wide encoding (assumed to be UTF-16) to UTF-8
1108  std::codecvt_utf8_utf16<value_type> __cvt;
1109  const value_type* __first = _M_pathname.data();
1110  const value_type* __last = __first + _M_pathname.size();
1111  if (__str_codecvt_out_all(__first, __last, __str, __cvt))
1112  return __str;
1113  __detail::__throw_conversion_error();
1114 #else
1115  return _M_pathname;
1116 #endif
1117  }
1118 #endif // _GLIBCXX_USE_CHAR8_T
1119 
1120  inline std::u16string
1121  path::u16string() const { return string<char16_t>(); }
1122 
1123  inline std::u32string
1124  path::u32string() const { return string<char32_t>(); }
1125 
1126  template<typename _CharT, typename _Traits, typename _Allocator>
1128  path::generic_string(const _Allocator& __a) const
1129  {
1130 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1131  const value_type __slash = L'/';
1132 #else
1133  const value_type __slash = '/';
1134 #endif
1135  using _Alloc2 = typename allocator_traits<_Allocator>::template
1136  rebind_alloc<value_type>;
1137  basic_string<value_type, char_traits<value_type>, _Alloc2> __str(__a);
1138 
1139  if (_M_type() == _Type::_Root_dir)
1140  __str.assign(1, __slash);
1141  else
1142  {
1143  __str.reserve(_M_pathname.size());
1144  bool __add_slash = false;
1145  for (auto& __elem : *this)
1146  {
1147 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1148  if (__elem._M_type() == _Type::_Root_dir)
1149  {
1150  __str += __slash;
1151  continue;
1152  }
1153 #endif
1154  if (__add_slash)
1155  __str += __slash;
1156  __str += basic_string_view<value_type>(__elem._M_pathname);
1157  __add_slash = __elem._M_type() == _Type::_Filename;
1158  }
1159  }
1160 
1161  if constexpr (is_same_v<_CharT, value_type>)
1162  return __str;
1163  else
1164  return _S_str_convert<_CharT, _Traits>(__str, __a);
1165  }
1166 
1167  inline std::string
1168  path::generic_string() const
1169  { return generic_string<char>(); }
1170 
1171 #if _GLIBCXX_USE_WCHAR_T
1172  inline std::wstring
1173  path::generic_wstring() const
1174  { return generic_string<wchar_t>(); }
1175 #endif
1176 
1177 #ifdef _GLIBCXX_USE_CHAR8_T
1178  inline std::u8string
1179  path::generic_u8string() const
1180  { return generic_string<char8_t>(); }
1181 #else
1182  inline std::string
1183  path::generic_u8string() const
1184  { return generic_string(); }
1185 #endif
1186 
1187  inline std::u16string
1188  path::generic_u16string() const
1189  { return generic_string<char16_t>(); }
1190 
1191  inline std::u32string
1192  path::generic_u32string() const
1193  { return generic_string<char32_t>(); }
1194 
1195  inline int
1196  path::compare(const string_type& __s) const noexcept
1197  { return compare(basic_string_view<value_type>(__s)); }
1198 
1199  inline int
1200  path::compare(const value_type* __s) const noexcept
1201  { return compare(basic_string_view<value_type>(__s)); }
1202 
1203  inline path
1204  path::filename() const
1205  {
1206  if (empty())
1207  return {};
1208  else if (_M_type() == _Type::_Filename)
1209  return *this;
1210  else if (_M_type() == _Type::_Multi)
1211  {
1212  if (_M_pathname.back() == preferred_separator)
1213  return {};
1214  auto& __last = *--end();
1215  if (__last._M_type() == _Type::_Filename)
1216  return __last;
1217  }
1218  return {};
1219  }
1220 
1221  inline path
1222  path::stem() const
1223  {
1224  auto ext = _M_find_extension();
1225  if (ext.first && ext.second != 0)
1226  return path{ext.first->substr(0, ext.second)};
1227  return {};
1228  }
1229 
1230  inline path
1231  path::extension() const
1232  {
1233  auto ext = _M_find_extension();
1234  if (ext.first && ext.second != string_type::npos)
1235  return path{ext.first->substr(ext.second)};
1236  return {};
1237  }
1238 
1239  inline bool
1240  path::has_stem() const noexcept
1241  {
1242  auto ext = _M_find_extension();
1243  return ext.first && ext.second != 0;
1244  }
1245 
1246  inline bool
1247  path::has_extension() const noexcept
1248  {
1249  auto ext = _M_find_extension();
1250  return ext.first && ext.second != string_type::npos;
1251  }
1252 
1253  inline bool
1254  path::is_absolute() const noexcept
1255  {
1256 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1257  return has_root_name() && has_root_directory();
1258 #else
1259  return has_root_directory();
1260 #endif
1261  }
1262 
1263  inline path::iterator
1264  path::begin() const
1265  {
1266  if (_M_type() == _Type::_Multi)
1267  return iterator(this, _M_cmpts.begin());
1268  return iterator(this, empty());
1269  }
1270 
1271  inline path::iterator
1272  path::end() const
1273  {
1274  if (_M_type() == _Type::_Multi)
1275  return iterator(this, _M_cmpts.end());
1276  return iterator(this, true);
1277  }
1278 
1279  inline path::iterator&
1280  path::iterator::operator++()
1281  {
1282  __glibcxx_assert(_M_path != nullptr);
1283  if (_M_path->_M_type() == _Type::_Multi)
1284  {
1285  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end());
1286  ++_M_cur;
1287  }
1288  else
1289  {
1290  __glibcxx_assert(!_M_at_end);
1291  _M_at_end = true;
1292  }
1293  return *this;
1294  }
1295 
1296  inline path::iterator&
1297  path::iterator::operator--()
1298  {
1299  __glibcxx_assert(_M_path != nullptr);
1300  if (_M_path->_M_type() == _Type::_Multi)
1301  {
1302  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.begin());
1303  --_M_cur;
1304  }
1305  else
1306  {
1307  __glibcxx_assert(_M_at_end);
1308  _M_at_end = false;
1309  }
1310  return *this;
1311  }
1312 
1313  inline path::iterator::reference
1314  path::iterator::operator*() const
1315  {
1316  __glibcxx_assert(_M_path != nullptr);
1317  if (_M_path->_M_type() == _Type::_Multi)
1318  {
1319  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end());
1320  return *_M_cur;
1321  }
1322  return *_M_path;
1323  }
1324 
1325  inline bool
1326  path::iterator::_M_equals(iterator __rhs) const
1327  {
1328  if (_M_path != __rhs._M_path)
1329  return false;
1330  if (_M_path == nullptr)
1331  return true;
1332  if (_M_path->_M_type() == path::_Type::_Multi)
1333  return _M_cur == __rhs._M_cur;
1334  return _M_at_end == __rhs._M_at_end;
1335  }
1336 
1337  // Define this now that path and path::iterator are complete.
1338  // It needs to consider the string_view(Range&&) constructor during
1339  // overload resolution, which depends on whether range<path> is satisfied,
1340  // which depends on whether path::iterator is complete.
1341  inline int
1342  path::_S_compare(const path& __lhs, const path& __rhs) noexcept
1343  { return __lhs.compare(__rhs); }
1344 
1345  /// @} group filesystem
1346 _GLIBCXX_END_NAMESPACE_CXX11
1347 } // namespace filesystem
1348 
1349 /// @cond undocumented
1350 
1351 inline ptrdiff_t
1352 distance(filesystem::path::iterator __first, filesystem::path::iterator __last)
1353 { return __path_iter_distance(__first, __last); }
1354 
1355 template<typename _Distance>
1356  void
1357  advance(filesystem::path::iterator& __i, _Distance __n)
1358  { __path_iter_advance(__i, static_cast<ptrdiff_t>(__n)); }
1359 
1360 extern template class __shared_ptr<const filesystem::filesystem_error::_Impl>;
1361 
1362 /// @endcond
1363 
1364 _GLIBCXX_END_NAMESPACE_VERSION
1365 } // namespace std
1366 
1367 #endif // C++17
1368 
1369 #endif // _GLIBCXX_FS_PATH_H
An iterator for the components of a path.
Definition: bits/fs_path.h:873
friend bool operator<=(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:536
Bidirectional iterators support a superset of forward iterator operations.
path u8path(_InputIterator __first, _InputIterator __last)
Definition: bits/fs_path.h:772
friend bool operator>(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:540
void reserve(size_type __res_arg)
Attempt to preallocate enough memory for specified number of characters.
Primary class template codecvt.NB: Generic, mostly useless implementation.
Definition: codecvt.h:277
integral_constant< bool, false > false_type
The type used as a compile-time boolean with false value.
Definition: type_traits:86
constexpr void advance(_InputIterator &__i, _Distance __n)
A generalization of pointer arithmetic.
Traits class for iterators.
void clear() noexcept
basic_string & assign(const basic_string &__str)
Set value to contents of another string.
friend bool operator<(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:532
Container class for localization functionality.The locale class is first a class wrapper for C librar...
friend path operator/(const path &__lhs, const path &__rhs)
Append one path to another.
Definition: bits/fs_path.h:549
constexpr complex< _Tp > operator*(const complex< _Tp > &__x, const complex< _Tp > &__y)
Return new complex value x times y.
Definition: complex:392
Definition: simd.h:210
constexpr auto data(_Container &__cont) noexcept(noexcept(__cont.data())) -> decltype(__cont.data())
Return the data pointer of a container.
Definition: range_access.h:290
Exception type thrown by the Filesystem library.
Definition: bits/fs_path.h:704
A filesystem path.
Definition: bits/fs_path.h:248
void swap(path &__lhs, path &__rhs) noexcept
Definition: bits/fs_path.h:697
An exception type that includes an error_code value.
Definition: system_error:446
constexpr _Tp * __addressof(_Tp &__r) noexcept
Same as C++11 std::addressof.
Definition: move.h:49
typename enable_if< _Cond, _Tp >::type enable_if_t
Alias template for enable_if.
Definition: type_traits:2585
_Tp * end(valarray< _Tp > &__va) noexcept
Return an iterator pointing to one past the last element of the valarray.
Definition: valarray:1237
path u8path(const _Source &__source)
Definition: bits/fs_path.h:794
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
void void_t
A metafunction that always yields void, used for detecting valid types.
Definition: type_traits:2607
Template class basic_ostream.
Definition: iosfwd:86
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
Definition: move.h:104
constexpr void replace(_ForwardIterator __first, _ForwardIterator __last, const _Tp &__old_value, const _Tp &__new_value)
Replace each occurrence of one value in a sequence with another value.
Definition: stl_algo.h:4356
friend bool operator!=(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:528
constexpr iterator_traits< _InputIterator >::difference_type distance(_InputIterator __first, _InputIterator __last)
A generalization of pointer arithmetic.
constexpr auto size(const _Container &__cont) noexcept(noexcept(__cont.size())) -> decltype(__cont.size())
Return the size of a container.
Definition: range_access.h:245
static const size_type npos
Value returned by various member functions when they fail.
format
path::format is ignored in this implementation
Definition: bits/fs_path.h:266
_Tp * begin(valarray< _Tp > &__va) noexcept
Return an iterator pointing to the first element of the valarray.
Definition: valarray:1215
const _CharT * data() const noexcept
Return const pointer to contents.
friend bool operator==(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:518
bool empty() const noexcept
friend bool operator>=(const path &__lhs, const path &__rhs) noexcept
Compare paths.
Definition: bits/fs_path.h:544
typename remove_reference< _Tp >::type remove_reference_t
Alias template for remove_reference.
Definition: type_traits:1645
Template class basic_istream.
Definition: iosfwd:83
A non-owning reference to a string.
Definition: string_view:98
ISO C++ entities toplevel namespace is std.
auto quoted(const _CharT *__string, _CharT __delim=_CharT('"'), _CharT __escape = _CharT('\))
Manipulator for quoted strings.
Definition: iomanip:461
integral_constant< bool, __v > bool_constant
Alias template for compile-time boolean constant types.
Definition: type_traits:99
const _CharT * c_str() const noexcept
Return const pointer to null-terminated contents.