libstdc++
experimental/bits/fs_path.h
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1 // Class filesystem::path -*- C++ -*-
2 
3 // Copyright (C) 2014-2022 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10 
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
15 
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19 
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24 
25 /** @file experimental/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{experimental/filesystem}
28  */
29 
30 #ifndef _GLIBCXX_EXPERIMENTAL_FS_PATH_H
31 #define _GLIBCXX_EXPERIMENTAL_FS_PATH_H 1
32 
33 #if __cplusplus < 201103L
34 # include <bits/c++0x_warning.h>
35 #else
36 
37 #include <utility>
38 #include <type_traits>
39 #include <vector>
40 #include <locale>
41 #include <iosfwd>
42 #include <codecvt>
43 #include <system_error>
44 #include <bits/stl_algobase.h>
45 #include <bits/quoted_string.h>
46 #include <bits/locale_conv.h>
47 #if __cplusplus == 201402L
48 # include <experimental/string_view>
49 #endif
50 
51 #if defined(_WIN32) && !defined(__CYGWIN__)
52 # define _GLIBCXX_FILESYSTEM_IS_WINDOWS 1
53 # include <algorithm>
54 #endif
55 
56 namespace std _GLIBCXX_VISIBILITY(default)
57 {
58 _GLIBCXX_BEGIN_NAMESPACE_VERSION
59 
60 namespace experimental
61 {
62 namespace filesystem
63 {
64 inline namespace v1
65 {
66 _GLIBCXX_BEGIN_NAMESPACE_CXX11
67 
68 #if __cplusplus == 201402L
70 #elif __cplusplus > 201402L
72 #endif
73 
74  /// @cond undocumented
75 namespace __detail
76 {
77  /** @addtogroup filesystem-ts
78  * @{
79  */
80 
81  template<typename _CharT,
82  typename _Ch = typename remove_const<_CharT>::type>
83  using __is_encoded_char
84  = __or_<is_same<_Ch, char>,
85  is_same<_Ch, wchar_t>,
86 #ifdef _GLIBCXX_USE_CHAR8_T
87  is_same<_Ch, char8_t>,
88 #endif
89  is_same<_Ch, char16_t>,
90  is_same<_Ch, char32_t>>;
91 
92  template<typename _Iter,
93  typename _Iter_traits = std::iterator_traits<_Iter>>
94  using __is_path_iter_src
95  = __and_<__is_encoded_char<typename _Iter_traits::value_type>,
97  typename _Iter_traits::iterator_category>>;
98 
99  template<typename _Iter>
100  static __is_path_iter_src<_Iter>
101  __is_path_src(_Iter, int);
102 
103  template<typename _CharT, typename _Traits, typename _Alloc>
104  static __is_encoded_char<_CharT>
105  __is_path_src(const basic_string<_CharT, _Traits, _Alloc>&, int);
106 
107 #if __cplusplus >= 201402L
108  template<typename _CharT, typename _Traits>
109  static __is_encoded_char<_CharT>
110  __is_path_src(const basic_string_view<_CharT, _Traits>&, int);
111 #endif
112 
113  template<typename _Unknown>
114  static std::false_type
115  __is_path_src(const _Unknown&, ...);
116 
117  template<typename _Tp1, typename _Tp2>
118  struct __constructible_from;
119 
120  template<typename _Iter>
121  struct __constructible_from<_Iter, _Iter>
122  : __is_path_iter_src<_Iter>
123  { };
124 
125  template<typename _Source>
126  struct __constructible_from<_Source, void>
127  : decltype(__is_path_src(std::declval<const _Source&>(), 0))
128  { };
129 
130  template<typename _Tp1, typename _Tp2 = void,
131  typename _Tp1_nocv = typename remove_cv<_Tp1>::type,
132  typename _Tp1_noptr = typename remove_pointer<_Tp1>::type>
133  using _Path = typename
135  __not_<is_void<_Tp1_noptr>>,
136  __constructible_from<_Tp1, _Tp2>>::value,
137  path>::type;
138 
139  template<typename _Source>
140  inline _Source
141  _S_range_begin(_Source __begin) { return __begin; }
142 
143  struct __nul_terminated { };
144 
145  template<typename _Source>
146  inline __nul_terminated
147  _S_range_end(_Source) { return {}; }
148 
149  template<typename _CharT, typename _Traits, typename _Alloc>
150  inline const _CharT*
151  _S_range_begin(const basic_string<_CharT, _Traits, _Alloc>& __str)
152  { return __str.data(); }
153 
154  template<typename _CharT, typename _Traits, typename _Alloc>
155  inline const _CharT*
156  _S_range_end(const basic_string<_CharT, _Traits, _Alloc>& __str)
157  { return __str.data() + __str.size(); }
158 
159 #if __cplusplus >= 201402L
160  template<typename _CharT, typename _Traits>
161  inline const _CharT*
162  _S_range_begin(const basic_string_view<_CharT, _Traits>& __str)
163  { return __str.data(); }
164 
165  template<typename _CharT, typename _Traits>
166  inline const _CharT*
167  _S_range_end(const basic_string_view<_CharT, _Traits>& __str)
168  { return __str.data() + __str.size(); }
169 #endif
170 
171  template<typename _Tp,
172  typename _Iter = decltype(_S_range_begin(std::declval<_Tp>())),
173  typename _Val = typename std::iterator_traits<_Iter>::value_type,
174  typename _UnqualVal = typename std::remove_const<_Val>::type>
175  using __value_type_is_char = typename std::enable_if<
177  _UnqualVal>::type;
178 
179  template<typename _Tp,
180  typename _Iter = decltype(_S_range_begin(std::declval<_Tp>())),
181  typename _Val = typename std::iterator_traits<_Iter>::value_type,
182  typename _UnqualVal = typename std::remove_const<_Val>::type>
183  using __value_type_is_char_or_char8_t = typename std::enable_if<
184  __or_<
186 #ifdef _GLIBCXX_USE_CHAR8_T
188 #endif
189  >::value, _UnqualVal>::type;
190 
191  /// @} group filesystem-ts
192 } // namespace __detail
193  /// @endcond
194 
195  /** @addtogroup filesystem-ts
196  * @{
197  */
198 
199  /// A filesystem path.
200  /// @ingroup filesystem-ts
201  class path
202  {
203  public:
204 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
205  typedef wchar_t value_type;
206  static constexpr value_type preferred_separator = L'\\';
207 #else
208  typedef char value_type;
209  static constexpr value_type preferred_separator = '/';
210 #endif
211  typedef std::basic_string<value_type> string_type;
212 
213  // constructors and destructor
214 
215  path() noexcept;
216  path(const path& __p);
217  path(path&& __p) noexcept;
218 
219  path(string_type&& __source);
220 
221  template<typename _Source,
222  typename _Require = __detail::_Path<_Source>>
223  path(_Source const& __source)
224  : _M_pathname(_S_convert(__detail::_S_range_begin(__source),
225  __detail::_S_range_end(__source)))
226  { _M_split_cmpts(); }
227 
228  template<typename _InputIterator,
229  typename _Require = __detail::_Path<_InputIterator, _InputIterator>>
230  path(_InputIterator __first, _InputIterator __last)
231  : _M_pathname(_S_convert(__first, __last))
232  { _M_split_cmpts(); }
233 
234  template<typename _Source,
235  typename _Require = __detail::_Path<_Source>,
236  typename _Require2 = __detail::__value_type_is_char<_Source>>
237  path(_Source const& __source, const locale& __loc)
238  : _M_pathname(_S_convert_loc(__detail::_S_range_begin(__source),
239  __detail::_S_range_end(__source), __loc))
240  { _M_split_cmpts(); }
241 
242  template<typename _InputIterator,
243  typename _Require = __detail::_Path<_InputIterator, _InputIterator>,
244  typename _Require2 = __detail::__value_type_is_char<_InputIterator>>
245  path(_InputIterator __first, _InputIterator __last, const locale& __loc)
246  : _M_pathname(_S_convert_loc(__first, __last, __loc))
247  { _M_split_cmpts(); }
248 
249  ~path();
250 
251  // assignments
252 
253  path& operator=(const path& __p);
254  path& operator=(path&& __p) noexcept;
255  path& operator=(string_type&& __source);
256  path& assign(string_type&& __source);
257 
258  template<typename _Source>
259  __detail::_Path<_Source>&
260  operator=(_Source const& __source)
261  { return *this = path(__source); }
262 
263  template<typename _Source>
264  __detail::_Path<_Source>&
265  assign(_Source const& __source)
266  { return *this = path(__source); }
267 
268  template<typename _InputIterator>
269  __detail::_Path<_InputIterator, _InputIterator>&
270  assign(_InputIterator __first, _InputIterator __last)
271  { return *this = path(__first, __last); }
272 
273  // appends
274 
275  path& operator/=(const path& __p) { return _M_append(__p._M_pathname); }
276 
277  template<typename _Source>
278  __detail::_Path<_Source>&
279  operator/=(_Source const& __source)
280  { return append(__source); }
281 
282  template<typename _Source>
283  __detail::_Path<_Source>&
284  append(_Source const& __source)
285  {
286  return _M_append(_S_convert(__detail::_S_range_begin(__source),
287  __detail::_S_range_end(__source)));
288  }
289 
290  template<typename _InputIterator>
291  __detail::_Path<_InputIterator, _InputIterator>&
292  append(_InputIterator __first, _InputIterator __last)
293  { return _M_append(_S_convert(__first, __last)); }
294 
295  // concatenation
296 
297  path& operator+=(const path& __x);
298  path& operator+=(const string_type& __x);
299  path& operator+=(const value_type* __x);
300  path& operator+=(value_type __x);
301 #if __cplusplus >= 201402L
302  path& operator+=(basic_string_view<value_type> __x);
303 #endif
304 
305  template<typename _Source>
306  __detail::_Path<_Source>&
307  operator+=(_Source const& __x) { return concat(__x); }
308 
309  template<typename _CharT>
310  __detail::_Path<_CharT*, _CharT*>&
311  operator+=(_CharT __x);
312 
313  template<typename _Source>
314  __detail::_Path<_Source>&
315  concat(_Source const& __x)
316  {
317  return *this += _S_convert(__detail::_S_range_begin(__x),
318  __detail::_S_range_end(__x));
319  }
320 
321  template<typename _InputIterator>
322  __detail::_Path<_InputIterator, _InputIterator>&
323  concat(_InputIterator __first, _InputIterator __last)
324  { return *this += _S_convert(__first, __last); }
325 
326  // modifiers
327 
328  void clear() noexcept { _M_pathname.clear(); _M_split_cmpts(); }
329 
330  path& make_preferred();
331  path& remove_filename();
332  path& replace_filename(const path& __replacement);
333  path& replace_extension(const path& __replacement = path());
334 
335  void swap(path& __rhs) noexcept;
336 
337  // native format observers
338 
339  const string_type& native() const noexcept { return _M_pathname; }
340  const value_type* c_str() const noexcept { return _M_pathname.c_str(); }
341  operator string_type() const { return _M_pathname; }
342 
343  template<typename _CharT, typename _Traits = std::char_traits<_CharT>,
344  typename _Allocator = std::allocator<_CharT>>
346  string(const _Allocator& __a = _Allocator()) const;
347 
348  std::string string() const;
349 #if _GLIBCXX_USE_WCHAR_T
350  std::wstring wstring() const;
351 #endif
352 #ifdef _GLIBCXX_USE_CHAR8_T
353  __attribute__((__abi_tag__("__u8")))
354  std::u8string u8string() const;
355 #else
356  std::string u8string() const;
357 #endif // _GLIBCXX_USE_CHAR8_T
358  std::u16string u16string() const;
359  std::u32string u32string() const;
360 
361  // generic format observers
362  template<typename _CharT, typename _Traits = std::char_traits<_CharT>,
363  typename _Allocator = std::allocator<_CharT>>
365  generic_string(const _Allocator& __a = _Allocator()) const;
366 
367  std::string generic_string() const;
368 #if _GLIBCXX_USE_WCHAR_T
369  std::wstring generic_wstring() const;
370 #endif
371 #ifdef _GLIBCXX_USE_CHAR8_T
372  __attribute__((__abi_tag__("__u8")))
373  std::u8string generic_u8string() const;
374 #else
375  std::string generic_u8string() const;
376 #endif // _GLIBCXX_USE_CHAR8_T
377  std::u16string generic_u16string() const;
378  std::u32string generic_u32string() const;
379 
380  // compare
381 
382  int compare(const path& __p) const noexcept;
383  int compare(const string_type& __s) const;
384  int compare(const value_type* __s) const;
385 #if __cplusplus >= 201402L
386  int compare(const basic_string_view<value_type> __s) const;
387 #endif
388 
389  // decomposition
390 
391  path root_name() const;
392  path root_directory() const;
393  path root_path() const;
394  path relative_path() const;
395  path parent_path() const;
396  path filename() const;
397  path stem() const;
398  path extension() const;
399 
400  // query
401 
402  _GLIBCXX_NODISCARD bool empty() const noexcept { return _M_pathname.empty(); }
403  bool has_root_name() const;
404  bool has_root_directory() const;
405  bool has_root_path() const;
406  bool has_relative_path() const;
407  bool has_parent_path() const;
408  bool has_filename() const;
409  bool has_stem() const;
410  bool has_extension() const;
411  bool is_absolute() const;
412  bool is_relative() const { return !is_absolute(); }
413 
414  // iterators
415  class iterator;
416  typedef iterator const_iterator;
417 
418  iterator begin() const noexcept;
419  iterator end() const noexcept;
420 
421  /// @cond undocumented
422  // Create a basic_string by reading until a null character.
423  template<typename _InputIterator,
424  typename _Traits = std::iterator_traits<_InputIterator>,
425  typename _CharT
426  = typename std::remove_cv<typename _Traits::value_type>::type>
428  _S_string_from_iter(_InputIterator __source)
429  {
431  for (_CharT __ch = *__source; __ch != _CharT(); __ch = *++__source)
432  __str.push_back(__ch);
433  return __str;
434  }
435  /// @endcond
436 
437  private:
438  enum class _Type : unsigned char {
439  _Multi, _Root_name, _Root_dir, _Filename
440  };
441 
442  path(string_type __str, _Type __type);
443 
444  enum class _Split { _Stem, _Extension };
445 
446  path& _M_append(const string_type& __str)
447  {
448  if (!_M_pathname.empty() && !_S_is_dir_sep(_M_pathname.back())
449  && !__str.empty() && !_S_is_dir_sep(__str.front()))
450  _M_pathname += preferred_separator;
451  _M_pathname += __str;
452  _M_split_cmpts();
453  return *this;
454  }
455 
456  pair<const string_type*, size_t> _M_find_extension() const;
457 
458  template<typename _CharT>
459  struct _Cvt;
460 
461  static string_type
462  _S_convert(value_type* __src, __detail::__nul_terminated)
463  { return string_type(__src); }
464 
465  static string_type
466  _S_convert(const value_type* __src, __detail::__nul_terminated)
467  { return string_type(__src); }
468 
469  template<typename _Iter>
470  static string_type
471  _S_convert(_Iter __first, _Iter __last)
472  {
473  using __value_type = typename std::iterator_traits<_Iter>::value_type;
474  return _Cvt<typename remove_cv<__value_type>::type>::
475  _S_convert(__first, __last);
476  }
477 
478  template<typename _InputIterator>
479  static string_type
480  _S_convert(_InputIterator __src, __detail::__nul_terminated)
481  {
482  auto __s = _S_string_from_iter(__src);
483  return _S_convert(__s.c_str(), __s.c_str() + __s.size());
484  }
485 
486  static string_type
487  _S_convert_loc(const char* __first, const char* __last,
488  const std::locale& __loc);
489 
490  static string_type
491  _S_convert_loc(char* __first, char* __last, const std::locale& __loc)
492  {
493  return _S_convert_loc(const_cast<const char*>(__first),
494  const_cast<const char*>(__last), __loc);
495  }
496 
497  template<typename _Iter>
498  static string_type
499  _S_convert_loc(_Iter __first, _Iter __last, const std::locale& __loc)
500  {
501  const std::string __str(__first, __last);
502  return _S_convert_loc(__str.data(), __str.data()+__str.size(), __loc);
503  }
504 
505  template<typename _InputIterator>
506  static string_type
507  _S_convert_loc(_InputIterator __src, __detail::__nul_terminated,
508  const std::locale& __loc)
509  {
510  const std::string __s = _S_string_from_iter(__src);
511  return _S_convert_loc(__s.data(), __s.data() + __s.size(), __loc);
512  }
513 
514  static bool _S_is_dir_sep(value_type __ch)
515  {
516 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
517  return __ch == L'/' || __ch == preferred_separator;
518 #else
519  return __ch == '/';
520 #endif
521  }
522 
523  void _M_split_cmpts();
524  void _M_trim();
525  void _M_add_root_name(size_t __n);
526  void _M_add_root_dir(size_t __pos);
527  void _M_add_filename(size_t __pos, size_t __n);
528 
529  string_type _M_pathname;
530 
531  struct _Cmpt;
532  using _List = _GLIBCXX_STD_C::vector<_Cmpt>;
533  _List _M_cmpts; // empty unless _M_type == _Type::_Multi
534  _Type _M_type = _Type::_Multi;
535  };
536 
537  /// @relates std::experimental::filesystem::path @{
538 
539  /// Swap overload for paths
540 #if __cpp_concepts >= 201907L
541  // Workaround for PR libstdc++/106201
542  inline void
543  swap(same_as<path> auto& __lhs, same_as<path> auto& __rhs) noexcept
544  { __lhs.swap(__rhs); }
545 #else
546  inline void swap(path& __lhs, path& __rhs) noexcept { __lhs.swap(__rhs); }
547 #endif
548 
549  /// Compute a hash value for a path
550  size_t hash_value(const path& __p) noexcept;
551 
552  /// Compare paths
553  inline bool operator<(const path& __lhs, const path& __rhs) noexcept;
554 
555  /// Compare paths
556  inline bool operator<=(const path& __lhs, const path& __rhs) noexcept
557  { return !(__rhs < __lhs); }
558 
559  /// Compare paths
560  inline bool operator>(const path& __lhs, const path& __rhs) noexcept
561  { return __rhs < __lhs; }
562 
563  /// Compare paths
564  inline bool operator>=(const path& __lhs, const path& __rhs) noexcept
565  { return !(__lhs < __rhs); }
566 
567  /// Compare paths
568  inline bool operator==(const path& __lhs, const path& __rhs) noexcept;
569 
570  /// Compare paths
571  inline bool operator!=(const path& __lhs, const path& __rhs) noexcept
572  { return !(__lhs == __rhs); }
573 
574  /// Append one path to another
575  inline path operator/(const path& __lhs, const path& __rhs)
576  {
577  path __result(__lhs);
578  __result /= __rhs;
579  return __result;
580  }
581 
582  /// Write a path to a stream
583  template<typename _CharT, typename _Traits>
584  basic_ostream<_CharT, _Traits>&
585  operator<<(basic_ostream<_CharT, _Traits>& __os, const path& __p)
586  {
587  auto __tmp = __p.string<_CharT, _Traits>();
588  using __quoted_string
589  = std::__detail::_Quoted_string<decltype(__tmp)&, _CharT>;
590  __os << __quoted_string{__tmp, _CharT('"'), _CharT('\\')};
591  return __os;
592  }
593 
594  /// Read a path from a stream
595  template<typename _CharT, typename _Traits>
596  basic_istream<_CharT, _Traits>&
597  operator>>(basic_istream<_CharT, _Traits>& __is, path& __p)
598  {
599  basic_string<_CharT, _Traits> __tmp;
600  using __quoted_string
601  = std::__detail::_Quoted_string<decltype(__tmp)&, _CharT>;
602  if (__is >> __quoted_string{ __tmp, _CharT('"'), _CharT('\\') })
603  __p = std::move(__tmp);
604  return __is;
605  }
606 
607  /// Create a path from a UTF-8-encoded sequence of char
608 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
609  template<typename _InputIterator>
610  inline path
611  __u8path(_InputIterator __first, _InputIterator __last, char)
612  {
613  // XXX This assumes native wide encoding is UTF-16.
614  std::codecvt_utf8_utf16<path::value_type> __cvt;
615  path::string_type __tmp;
616  const std::string __u8str{__first, __last};
617  const char* const __ptr = __u8str.data();
618  if (__str_codecvt_in_all(__ptr, __ptr + __u8str.size(), __tmp, __cvt))
619  return path{ __tmp };
620  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
621  "Cannot convert character sequence",
622  std::make_error_code(errc::illegal_byte_sequence)));
623  }
624 
625 #ifdef _GLIBCXX_USE_CHAR8_T
626  template<typename _InputIterator>
627  inline path
628  __u8path(_InputIterator __first, _InputIterator __last, char8_t)
629  {
630  return path{ __first, __last };
631  }
632 #endif // _GLIBCXX_USE_CHAR8_T
633 #endif // _GLIBCXX_FILESYSTEM_IS_WINDOWS
634 
635  template<typename _InputIterator,
636  typename _Require = __detail::_Path<_InputIterator, _InputIterator>,
637  typename _CharT =
638  __detail::__value_type_is_char_or_char8_t<_InputIterator>>
639  inline path
640  u8path(_InputIterator __first, _InputIterator __last)
641  {
642 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
643  return __u8path(__first, __last, _CharT{});
644 #else
645  return path{ __first, __last };
646 #endif
647  }
648 
649  /// Create a path from a UTF-8-encoded sequence of char
650 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
651  inline path
652  __u8path(const string& __s, char)
653  {
654  return filesystem::u8path(__s.data(), __s.data() + __s.size());
655  }
656 
657  template<typename _Source>
658  inline __enable_if_t<is_convertible<const _Source&, string>::value, path>
659  __u8path(const _Source& __source, char)
660  {
661  std::string __s = __source;
662  return filesystem::u8path(__s.data(), __s.data() + __s.size());
663  }
664 
665  template<typename _Source>
666  inline __enable_if_t<!is_convertible<const _Source&, string>::value, path>
667  __u8path(const _Source& __source, char)
668  {
669  std::string __s = path::_S_string_from_iter(__source);
670  return filesystem::u8path(__s.data(), __s.data() + __s.size());
671  }
672 
673 #ifdef _GLIBCXX_USE_CHAR8_T
674  template<typename _Source>
675  inline path
676  __u8path(const _Source& __source, char8_t)
677  {
678  return path{ __source };
679  }
680 #endif // _GLIBCXX_USE_CHAR8_T
681 #endif // _GLIBCXX_FILESYSTEM_IS_WINDOWS
682 
683  template<typename _Source,
684  typename _Require = __detail::_Path<_Source>,
685  typename _CharT =
686  __detail::__value_type_is_char_or_char8_t<_Source>>
687  inline path
688  u8path(const _Source& __source)
689  {
690 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
691  return __u8path(__source, _CharT{});
692 #else
693  return path{ __source };
694 #endif
695  }
696 
697  /// @}
698 
699  /// Exception type thrown by the Filesystem TS library
701  {
702  public:
703  filesystem_error(const string& __what_arg, error_code __ec)
704  : system_error(__ec, __what_arg) { }
705 
706  filesystem_error(const string& __what_arg, const path& __p1,
707  error_code __ec)
708  : system_error(__ec, __what_arg), _M_path1(__p1) { }
709 
710  filesystem_error(const string& __what_arg, const path& __p1,
711  const path& __p2, error_code __ec)
712  : system_error(__ec, __what_arg), _M_path1(__p1), _M_path2(__p2)
713  { }
714 
715  ~filesystem_error();
716 
717  const path& path1() const noexcept { return _M_path1; }
718  const path& path2() const noexcept { return _M_path2; }
719  const char* what() const noexcept { return _M_what.c_str(); }
720 
721  private:
722  std::string _M_gen_what();
723 
724  path _M_path1;
725  path _M_path2;
726  std::string _M_what = _M_gen_what();
727  };
728 
729  /// @cond undocumented
730  struct path::_Cmpt : path
731  {
732  _Cmpt(string_type __s, _Type __t, size_t __pos)
733  : path(std::move(__s), __t), _M_pos(__pos) { }
734 
735  _Cmpt() : _M_pos(-1) { }
736 
737  size_t _M_pos;
738  };
739 
740  // specialize _Cvt for degenerate 'noconv' case
741  template<>
742  struct path::_Cvt<path::value_type>
743  {
744  // We need this type to be defined because we don't have `if constexpr`
745  // in C++11 and so path::string<C,T,A>(const A&) needs to be able to
746  // declare a variable of this type and pass it to __str_codecvt_in_all.
747  using __codecvt_utf8_to_wide = _Cvt;
748  // Dummy overload used for unreachable calls in path::string<C,T,A>.
749  template<typename _WStr>
750  friend bool
751  __str_codecvt_in_all(const char*, const char*,
752  _WStr&, __codecvt_utf8_to_wide&) noexcept
753  { return true; }
754 
755  template<typename _Iter>
756  static string_type
757  _S_convert(_Iter __first, _Iter __last)
758  { return string_type{__first, __last}; }
759  };
760 
761  // Performs conversions from _CharT to path::string_type.
762  template<typename _CharT>
763  struct path::_Cvt
764  {
765  // FIXME: We currently assume that the native wide encoding for wchar_t
766  // is either UTF-32 or UTF-16 (depending on the width of wchar_t).
767  // See comments in <bits/fs_path.h> for further details.
768  using __codecvt_utf8_to_wchar
769  = __conditional_t<sizeof(wchar_t) == sizeof(char32_t),
770  std::codecvt_utf8<wchar_t>, // from UTF-32
771  std::codecvt_utf8_utf16<wchar_t>>; // from UTF-16
772 
773  // Converts from char16_t or char32_t using std::codecvt<charNN_t, char>.
774  // Need derived class here because std::codecvt has protected destructor.
775  struct __codecvt_utf8_to_utfNN : std::codecvt<_CharT, char, mbstate_t>
776  { };
777 
778  // Convert from native pathname format (assumed to be UTF-8 everywhere)
779  // to the encoding implied by the wide character type _CharT.
780  using __codecvt_utf8_to_wide
781  = __conditional_t<is_same<_CharT, wchar_t>::value,
782  __codecvt_utf8_to_wchar,
783  __codecvt_utf8_to_utfNN>;
784 
785 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
786 #ifdef _GLIBCXX_USE_CHAR8_T
787  static string_type
788  _S_wconvert(const char8_t* __f, const char8_t* __l, const char8_t*)
789  {
790  const char* __f2 = (const char*)__f;
791  const char* __l2 = (const char*)__l;
792  std::wstring __wstr;
793  std::codecvt_utf8_utf16<wchar_t> __wcvt;
794  if (__str_codecvt_in_all(__f2, __l2, __wstr, __wcvt))
795  return __wstr;
796  }
797 #endif
798 
799  static string_type
800  _S_wconvert(const char* __f, const char* __l, const char*)
801  {
802  std::codecvt_utf8_utf16<wchar_t> __cvt;
803  std::wstring __wstr;
804  if (__str_codecvt_in_all(__f, __l, __wstr, __cvt))
805  return __wstr;
806  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
807  "Cannot convert character sequence",
808  std::make_error_code(errc::illegal_byte_sequence)));
809  }
810 
811  static string_type
812  _S_wconvert(const _CharT* __f, const _CharT* __l, const void*)
813  {
814  __codecvt_utf8_to_wide __cvt;
815  std::string __str;
816  if (__str_codecvt_out_all(__f, __l, __str, __cvt))
817  {
818  const char* __f2 = __str.data();
819  const char* __l2 = __f2 + __str.size();
820  std::codecvt_utf8_utf16<wchar_t> __wcvt;
821  std::wstring __wstr;
822  if (__str_codecvt_in_all(__f2, __l2, __wstr, __wcvt))
823  return __wstr;
824  }
825  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
826  "Cannot convert character sequence",
827  std::make_error_code(errc::illegal_byte_sequence)));
828  }
829 
830  static string_type
831  _S_convert(const _CharT* __f, const _CharT* __l)
832  {
833  return _S_wconvert(__f, __l, (const _CharT*)nullptr);
834  }
835 #else
836  static string_type
837  _S_convert(const _CharT* __f, const _CharT* __l)
838  {
839 #ifdef _GLIBCXX_USE_CHAR8_T
840  if constexpr (is_same<_CharT, char8_t>::value)
841  return string_type(__f, __l);
842  else
843 #endif
844  {
845  __codecvt_utf8_to_wide __cvt;
846  std::string __str;
847  if (__str_codecvt_out_all(__f, __l, __str, __cvt))
848  return __str;
849  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
850  "Cannot convert character sequence",
851  std::make_error_code(errc::illegal_byte_sequence)));
852  }
853  }
854 #endif
855 
856  static string_type
857  _S_convert(_CharT* __f, _CharT* __l)
858  {
859  return _S_convert(const_cast<const _CharT*>(__f),
860  const_cast<const _CharT*>(__l));
861  }
862 
863  template<typename _Iter>
864  static string_type
865  _S_convert(_Iter __first, _Iter __last)
866  {
867  const std::basic_string<_CharT> __str(__first, __last);
868  return _S_convert(__str.data(), __str.data() + __str.size());
869  }
870 
871  template<typename _Iter, typename _Cont>
872  static string_type
873  _S_convert(__gnu_cxx::__normal_iterator<_Iter, _Cont> __first,
874  __gnu_cxx::__normal_iterator<_Iter, _Cont> __last)
875  { return _S_convert(__first.base(), __last.base()); }
876  };
877  /// @endcond
878 
879  /// An iterator for the components of a path
881  {
882  public:
883  using difference_type = std::ptrdiff_t;
884  using value_type = path;
885  using reference = const path&;
886  using pointer = const path*;
888 
889  iterator() noexcept : _M_path(nullptr), _M_cur(), _M_at_end() { }
890 
891  iterator(const iterator&) = default;
892  iterator& operator=(const iterator&) = default;
893 
894  reference operator*() const noexcept;
895  pointer operator->() const noexcept { return std::__addressof(**this); }
896 
897  iterator& operator++() noexcept;
898 
899  iterator operator++(int) noexcept
900  { auto __tmp = *this; ++*this; return __tmp; }
901 
902  iterator& operator--() noexcept;
903 
904  iterator operator--(int) noexcept
905  { auto __tmp = *this; --*this; return __tmp; }
906 
907  friend bool
908  operator==(const iterator& __lhs, const iterator& __rhs) noexcept
909  { return __lhs._M_equals(__rhs); }
910 
911  friend bool
912  operator!=(const iterator& __lhs, const iterator& __rhs) noexcept
913  { return !__lhs._M_equals(__rhs); }
914 
915  private:
916  friend class path;
917 
918  iterator(const path* __path, path::_List::const_iterator __iter) noexcept
919  : _M_path(__path), _M_cur(__iter), _M_at_end()
920  { }
921 
922  iterator(const path* __path, bool __at_end) noexcept
923  : _M_path(__path), _M_cur(), _M_at_end(__at_end)
924  { }
925 
926  bool _M_equals(iterator) const noexcept;
927 
928  const path* _M_path;
929  path::_List::const_iterator _M_cur;
930  bool _M_at_end; // only used when type != _Multi
931  };
932 
933  inline
934  path::path() noexcept = default;
935 
936  inline
937  path::path(const path&) = default;
938 
939  inline
940  path::path(path&& __p) noexcept
941  : _M_pathname(std::move(__p._M_pathname)),
942  _M_cmpts(__p._M_cmpts),
943  _M_type(__p._M_type)
944  { __p.clear(); }
945 
946  inline
947  path::path(string_type&& __source)
948  : _M_pathname(std::move(__source))
949  { _M_split_cmpts(); }
950 
951  inline
952  path::path(string_type __str, _Type __type)
953  : _M_pathname(__str), _M_type(__type)
954  {
955  __glibcxx_assert(!empty());
956  __glibcxx_assert(_M_type != _Type::_Multi);
957  }
958 
959  inline
960  path::~path() = default;
961 
962  inline path&
963  path::operator=(const path& __p) = default;
964 
965  inline path&
966  path::operator=(path&& __p) noexcept
967  {
968  _M_pathname = std::move(__p._M_pathname);
969  _M_cmpts = std::move(__p._M_cmpts);
970  _M_type = __p._M_type;
971  __p.clear();
972  return *this;
973  }
974 
975  inline path&
976  path::operator=(string_type&& __source)
977  { return *this = path(std::move(__source)); }
978 
979  inline path&
980  path::assign(string_type&& __source)
981  { return *this = path(std::move(__source)); }
982 
983  inline path&
984  path::operator+=(const path& __p)
985  {
986  return operator+=(__p.native());
987  }
988 
989  inline path&
990  path::operator+=(const string_type& __x)
991  {
992  _M_pathname += __x;
993  _M_split_cmpts();
994  return *this;
995  }
996 
997  inline path&
998  path::operator+=(const value_type* __x)
999  {
1000  _M_pathname += __x;
1001  _M_split_cmpts();
1002  return *this;
1003  }
1004 
1005  inline path&
1006  path::operator+=(value_type __x)
1007  {
1008  _M_pathname += __x;
1009  _M_split_cmpts();
1010  return *this;
1011  }
1012 
1013 #if __cplusplus >= 201402L
1014  inline path&
1015  path::operator+=(basic_string_view<value_type> __x)
1016  {
1017  _M_pathname.append(__x.data(), __x.size());
1018  _M_split_cmpts();
1019  return *this;
1020  }
1021 #endif
1022 
1023  template<typename _CharT>
1024  inline __detail::_Path<_CharT*, _CharT*>&
1025  path::operator+=(_CharT __x)
1026  {
1027  auto* __addr = std::__addressof(__x);
1028  return concat(__addr, __addr + 1);
1029  }
1030 
1031  inline path&
1032  path::make_preferred()
1033  {
1034 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1035  std::replace(_M_pathname.begin(), _M_pathname.end(), L'/',
1036  preferred_separator);
1037 #endif
1038  return *this;
1039  }
1040 
1041  inline void path::swap(path& __rhs) noexcept
1042  {
1043  _M_pathname.swap(__rhs._M_pathname);
1044  _M_cmpts.swap(__rhs._M_cmpts);
1045  std::swap(_M_type, __rhs._M_type);
1046  }
1047 
1048  template<typename _CharT, typename _Traits, typename _Allocator>
1050  path::string(const _Allocator& __a) const
1051  {
1052  if _GLIBCXX_CONSTEXPR (is_same<_CharT, value_type>::value)
1053  return { _M_pathname.begin(), _M_pathname.end(), __a };
1054 
1055  using _WString = basic_string<_CharT, _Traits, _Allocator>;
1056 
1057  const value_type* __first = _M_pathname.data();
1058  const value_type* __last = __first + _M_pathname.size();
1059 
1060 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1061  using _CharAlloc = __alloc_rebind<_Allocator, char>;
1062  using _String = basic_string<char, char_traits<char>, _CharAlloc>;
1063 
1064  // First convert native string from UTF-16 to to UTF-8.
1065  // XXX This assumes that the execution wide-character set is UTF-16.
1066  codecvt_utf8_utf16<value_type> __cvt;
1067  _String __u8str{_CharAlloc{__a}};
1068  if (__str_codecvt_out_all(__first, __last, __u8str, __cvt))
1069  {
1070  struct
1071  {
1072  const _String*
1073  operator()(const _String& __from, _String&, true_type)
1074  { return std::__addressof(__from); }
1075 
1076  _WString*
1077  operator()(const _String& __from, _WString& __to, false_type)
1078  {
1079 #ifdef _GLIBCXX_USE_CHAR8_T
1080  if constexpr (is_same<_CharT, char8_t>::value)
1081  {
1082  __to.assign(__from.begin(), __from.end());
1083  return std::__addressof(__to);
1084  }
1085  else
1086 #endif
1087  {
1088  // Convert UTF-8 to char16_t or char32_t string.
1089  typename path::_Cvt<_CharT>::__codecvt_utf8_to_wide __cvt;
1090  const char* __f = __from.data();
1091  const char* __l = __f + __from.size();
1092  if (__str_codecvt_in_all(__f, __l, __to, __cvt))
1093  return std::__addressof(__to);
1094  }
1095  return nullptr;
1096  }
1097  } __dispatch;
1098  _WString __wstr(__a);
1099  if (auto* __p = __dispatch(__u8str, __wstr, is_same<_CharT, char>{}))
1100  return *__p;
1101  }
1102 #else // ! Windows
1103 #ifdef _GLIBCXX_USE_CHAR8_T
1104  if constexpr (is_same<_CharT, char8_t>::value)
1105  return _WString(__first, __last, __a);
1106  else
1107 #endif
1108  {
1109  typename path::_Cvt<_CharT>::__codecvt_utf8_to_wide __cvt;
1110  _WString __wstr(__a);
1111  if (__str_codecvt_in_all(__first, __last, __wstr, __cvt))
1112  return __wstr;
1113  }
1114 #endif
1115  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
1116  "Cannot convert character sequence",
1117  std::make_error_code(errc::illegal_byte_sequence)));
1118  }
1119 
1120  inline std::string
1121  path::string() const { return string<char>(); }
1122 
1123 #if _GLIBCXX_USE_WCHAR_T
1124  inline std::wstring
1125  path::wstring() const { return string<wchar_t>(); }
1126 #endif
1127 
1128 #ifdef _GLIBCXX_USE_CHAR8_T
1129  inline std::u8string
1130  path::u8string() const { return string<char8_t>(); }
1131 #else
1132  inline std::string
1133  path::u8string() const
1134  {
1135 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1136  std::string __str;
1137  // convert from native wide encoding (assumed to be UTF-16) to UTF-8
1138  std::codecvt_utf8_utf16<value_type> __cvt;
1139  const value_type* __first = _M_pathname.data();
1140  const value_type* __last = __first + _M_pathname.size();
1141  if (__str_codecvt_out_all(__first, __last, __str, __cvt))
1142  return __str;
1143  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
1144  "Cannot convert character sequence",
1145  std::make_error_code(errc::illegal_byte_sequence)));
1146 #else
1147  return _M_pathname;
1148 #endif
1149  }
1150 #endif // _GLIBCXX_USE_CHAR8_T
1151 
1152  inline std::u16string
1153  path::u16string() const { return string<char16_t>(); }
1154 
1155  inline std::u32string
1156  path::u32string() const { return string<char32_t>(); }
1157 
1158  template<typename _CharT, typename _Traits, typename _Allocator>
1160  path::generic_string(const _Allocator& __a) const
1161  {
1162 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1163  const _CharT __slash = is_same<_CharT, wchar_t>::value
1164  ? _CharT(L'/')
1165  : _CharT('/'); // Assume value is correct for the encoding.
1166 #else
1167  const _CharT __slash = _CharT('/');
1168 #endif
1169  basic_string<_CharT, _Traits, _Allocator> __str(__a);
1170  __str.reserve(_M_pathname.size());
1171  bool __add_slash = false;
1172  for (auto& __elem : *this)
1173  {
1174  if (__elem._M_type == _Type::_Root_dir)
1175  {
1176  __str += __slash;
1177  continue;
1178  }
1179  if (__add_slash)
1180  __str += __slash;
1181  __str += __elem.string<_CharT, _Traits, _Allocator>(__a);
1182  __add_slash = __elem._M_type == _Type::_Filename;
1183  }
1184  return __str;
1185  }
1186 
1187  inline std::string
1188  path::generic_string() const { return generic_string<char>(); }
1189 
1190 #if _GLIBCXX_USE_WCHAR_T
1191  inline std::wstring
1192  path::generic_wstring() const { return generic_string<wchar_t>(); }
1193 #endif
1194 
1195 #ifdef _GLIBCXX_USE_CHAR8_T
1196  inline std::u8string
1197  path::generic_u8string() const { return generic_string<char8_t>(); }
1198 #else
1199  inline std::string
1200  path::generic_u8string() const { return generic_string<char>(); }
1201 #endif
1202 
1203  inline std::u16string
1204  path::generic_u16string() const { return generic_string<char16_t>(); }
1205 
1206  inline std::u32string
1207  path::generic_u32string() const { return generic_string<char32_t>(); }
1208 
1209  inline int
1210  path::compare(const string_type& __s) const { return compare(path(__s)); }
1211 
1212  inline int
1213  path::compare(const value_type* __s) const { return compare(path(__s)); }
1214 
1215 #if __cplusplus >= 201402L
1216  inline int
1217  path::compare(basic_string_view<value_type> __s) const
1218  { return compare(path(__s)); }
1219 #endif
1220 
1221  inline path
1222  path::filename() const { return empty() ? path() : *--end(); }
1223 
1224  inline path
1225  path::stem() const
1226  {
1227  auto ext = _M_find_extension();
1228  if (ext.first && ext.second != 0)
1229  return path{ext.first->substr(0, ext.second)};
1230  return {};
1231  }
1232 
1233  inline path
1234  path::extension() const
1235  {
1236  auto ext = _M_find_extension();
1237  if (ext.first && ext.second != string_type::npos)
1238  return path{ext.first->substr(ext.second)};
1239  return {};
1240  }
1241 
1242  inline bool
1243  path::has_stem() const
1244  {
1245  auto ext = _M_find_extension();
1246  return ext.first && ext.second != 0;
1247  }
1248 
1249  inline bool
1250  path::has_extension() const
1251  {
1252  auto ext = _M_find_extension();
1253  return ext.first && ext.second != string_type::npos;
1254  }
1255 
1256  inline bool
1257  path::is_absolute() const
1258  {
1259 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1260  return has_root_name() && has_root_directory();
1261 #else
1262  return has_root_directory();
1263 #endif
1264  }
1265 
1266  inline path::iterator
1267  path::begin() const noexcept
1268  {
1269  if (_M_type == _Type::_Multi)
1270  return iterator(this, _M_cmpts.begin());
1271  return iterator(this, false);
1272  }
1273 
1274  inline path::iterator
1275  path::end() const noexcept
1276  {
1277  if (_M_type == _Type::_Multi)
1278  return iterator(this, _M_cmpts.end());
1279  return iterator(this, true);
1280  }
1281 
1282  inline path::iterator&
1283  path::iterator::operator++() noexcept
1284  {
1285  __glibcxx_assert(_M_path != nullptr);
1286  if (_M_path->_M_type == _Type::_Multi)
1287  {
1288  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end());
1289  ++_M_cur;
1290  }
1291  else
1292  {
1293  __glibcxx_assert(!_M_at_end);
1294  _M_at_end = true;
1295  }
1296  return *this;
1297  }
1298 
1299  inline path::iterator&
1300  path::iterator::operator--() noexcept
1301  {
1302  __glibcxx_assert(_M_path != nullptr);
1303  if (_M_path->_M_type == _Type::_Multi)
1304  {
1305  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.begin());
1306  --_M_cur;
1307  }
1308  else
1309  {
1310  __glibcxx_assert(_M_at_end);
1311  _M_at_end = false;
1312  }
1313  return *this;
1314  }
1315 
1316  inline path::iterator::reference
1317  path::iterator::operator*() const noexcept
1318  {
1319  __glibcxx_assert(_M_path != nullptr);
1320  if (_M_path->_M_type == _Type::_Multi)
1321  {
1322  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end());
1323  return *_M_cur;
1324  }
1325  return *_M_path;
1326  }
1327 
1328  inline bool
1329  path::iterator::_M_equals(iterator __rhs) const noexcept
1330  {
1331  if (_M_path != __rhs._M_path)
1332  return false;
1333  if (_M_path == nullptr)
1334  return true;
1335  if (_M_path->_M_type == path::_Type::_Multi)
1336  return _M_cur == __rhs._M_cur;
1337  return _M_at_end == __rhs._M_at_end;
1338  }
1339 
1340  // Define these now that path and path::iterator are complete.
1341  // They needs to consider the string_view(Range&&) constructor during
1342  // overload resolution, which depends on whether range<path> is satisfied,
1343  // which depends on whether path::iterator is complete.
1344  inline bool operator<(const path& __lhs, const path& __rhs) noexcept
1345  { return __lhs.compare(__rhs) < 0; }
1346 
1347  inline bool operator==(const path& __lhs, const path& __rhs) noexcept
1348  { return __lhs.compare(__rhs) == 0; }
1349 
1350  /// @} group filesystem-ts
1351 _GLIBCXX_END_NAMESPACE_CXX11
1352 } // namespace v1
1353 } // namespace filesystem
1354 } // namespace experimental
1355 
1356 _GLIBCXX_END_NAMESPACE_VERSION
1357 } // namespace std
1358 
1359 #endif // C++11
1360 
1361 #endif // _GLIBCXX_EXPERIMENTAL_FS_PATH_H
constexpr complex< _Tp > operator*(const complex< _Tp > &__x, const complex< _Tp > &__y)
Return new complex value x times y.
Definition: complex:392
constexpr complex< _Tp > operator/(const complex< _Tp > &__x, const complex< _Tp > &__y)
Return new complex value x divided by y.
Definition: complex:422
error_code make_error_code(future_errc __errc) noexcept
Overload of make_error_code for future_errc.
Definition: future:92
integral_constant< bool, true > true_type
The type used as a compile-time boolean with true value.
Definition: type_traits:82
integral_constant< bool, false > false_type
The type used as a compile-time boolean with false value.
Definition: type_traits:85
constexpr _Tp * __addressof(_Tp &__r) noexcept
Same as C++11 std::addressof.
Definition: move.h:49
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
Definition: move.h:104
void swap(any &__x, any &__y) noexcept
Exchange the states of two any objects.
Definition: any:429
basic_string< char > string
A string of char.
Definition: stringfwd.h:72
basic_string< char32_t > u32string
A string of char32_t.
Definition: stringfwd.h:92
basic_string< char16_t > u16string
A string of char16_t.
Definition: stringfwd.h:89
basic_string< wchar_t > wstring
A string of wchar_t.
Definition: stringfwd.h:80
ISO C++ entities toplevel namespace is std.
std::basic_istream< _CharT, _Traits > & operator>>(std::basic_istream< _CharT, _Traits > &__is, bitset< _Nb > &__x)
Global I/O operators for bitsets.
Definition: bitset:1475
std::basic_ostream< _CharT, _Traits > & operator<<(std::basic_ostream< _CharT, _Traits > &__os, const bitset< _Nb > &__x)
Global I/O operators for bitsets.
Definition: bitset:1543
A non-owning reference to a string.
Definition: string_view:101
An exception type that includes an error_code value.
Definition: system_error:552
integral_constant
Definition: type_traits:63
is_same
Definition: type_traits:1435
is_base_of
Definition: type_traits:1448
Define a member typedef type only if a boolean constant is true.
Definition: type_traits:2223
Primary class template codecvt.
Definition: codecvt.h:279
void push_back(_CharT __c)
Append a single character.
Definition: cow_string.h:1331
const _CharT * c_str() const noexcept
Return const pointer to null-terminated contents.
Definition: cow_string.h:2206
void reserve(size_type __res_arg)
Attempt to preallocate enough memory for specified number of characters.
Definition: cow_string.h:3422
size_type size() const noexcept
Returns the number of characters in the string, not including any null-termination.
Definition: cow_string.h:913
const _CharT * data() const noexcept
Return const pointer to contents.
Definition: cow_string.h:2218
iterator begin()
Definition: cow_string.h:803
void clear() noexcept
Definition: cow_string.h:1004
bool empty() const noexcept
Definition: cow_string.h:1026
reference back()
Definition: cow_string.h:1141
static const size_type npos
Value returned by various member functions when they fail.
Definition: cow_string.h:328
Traits class for iterators.
Container class for localization functionality.
Struct for delimited strings.
Definition: quoted_string.h:50
Struct holding two objects of arbitrary type.
Definition: stl_pair.h:187
Marking input iterators.
Bidirectional iterators support a superset of forward iterator operations.
Common iterator class.
Exception type thrown by the Filesystem TS library.
A non-owning reference to a string.