libstdc++
experimental/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 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  /** @addtogroup filesystem-ts
75  * @{
76  */
77 
78  /// @cond undocumented
79 namespace __detail
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<_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 __null_terminated { };
144 
145  template<typename _Source>
146  inline __null_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 } // namespace __detail
192  /// @endcond
193 
194  /// A filesystem path.
195  class path
196  {
197  public:
198 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
199  typedef wchar_t value_type;
200  static constexpr value_type preferred_separator = L'\\';
201 #else
202  typedef char value_type;
203  static constexpr value_type preferred_separator = '/';
204 #endif
205  typedef std::basic_string<value_type> string_type;
206 
207  // constructors and destructor
208 
209  path() noexcept { }
210 
211  path(const path& __p) = default;
212 
213  path(path&& __p) noexcept
214  : _M_pathname(std::move(__p._M_pathname)), _M_type(__p._M_type)
215  {
216  if (_M_type == _Type::_Multi)
217  _M_split_cmpts();
218  __p.clear();
219  }
220 
221  path(string_type&& __source)
222  : _M_pathname(std::move(__source))
223  { _M_split_cmpts(); }
224 
225  template<typename _Source,
226  typename _Require = __detail::_Path<_Source>>
227  path(_Source const& __source)
228  : _M_pathname(_S_convert(__detail::_S_range_begin(__source),
229  __detail::_S_range_end(__source)))
230  { _M_split_cmpts(); }
231 
232  template<typename _InputIterator,
233  typename _Require = __detail::_Path<_InputIterator, _InputIterator>>
234  path(_InputIterator __first, _InputIterator __last)
235  : _M_pathname(_S_convert(__first, __last))
236  { _M_split_cmpts(); }
237 
238  template<typename _Source,
239  typename _Require = __detail::_Path<_Source>,
240  typename _Require2 = __detail::__value_type_is_char<_Source>>
241  path(_Source const& __source, const locale& __loc)
242  : _M_pathname(_S_convert_loc(__detail::_S_range_begin(__source),
243  __detail::_S_range_end(__source), __loc))
244  { _M_split_cmpts(); }
245 
246  template<typename _InputIterator,
247  typename _Require = __detail::_Path<_InputIterator, _InputIterator>,
248  typename _Require2 = __detail::__value_type_is_char<_InputIterator>>
249  path(_InputIterator __first, _InputIterator __last, const locale& __loc)
250  : _M_pathname(_S_convert_loc(__first, __last, __loc))
251  { _M_split_cmpts(); }
252 
253  ~path() = default;
254 
255  // assignments
256 
257  path& operator=(const path& __p) = default;
258  path& operator=(path&& __p) noexcept;
259  path& operator=(string_type&& __source);
260  path& assign(string_type&& __source);
261 
262  template<typename _Source>
263  __detail::_Path<_Source>&
264  operator=(_Source const& __source)
265  { return *this = path(__source); }
266 
267  template<typename _Source>
268  __detail::_Path<_Source>&
269  assign(_Source const& __source)
270  { return *this = path(__source); }
271 
272  template<typename _InputIterator>
273  __detail::_Path<_InputIterator, _InputIterator>&
274  assign(_InputIterator __first, _InputIterator __last)
275  { return *this = path(__first, __last); }
276 
277  // appends
278 
279  path& operator/=(const path& __p) { return _M_append(__p._M_pathname); }
280 
281  template<typename _Source>
282  __detail::_Path<_Source>&
283  operator/=(_Source const& __source)
284  { return append(__source); }
285 
286  template<typename _Source>
287  __detail::_Path<_Source>&
288  append(_Source const& __source)
289  {
290  return _M_append(_S_convert(__detail::_S_range_begin(__source),
291  __detail::_S_range_end(__source)));
292  }
293 
294  template<typename _InputIterator>
295  __detail::_Path<_InputIterator, _InputIterator>&
296  append(_InputIterator __first, _InputIterator __last)
297  { return _M_append(_S_convert(__first, __last)); }
298 
299  // concatenation
300 
301  path& operator+=(const path& __x);
302  path& operator+=(const string_type& __x);
303  path& operator+=(const value_type* __x);
304  path& operator+=(value_type __x);
305 #if __cplusplus >= 201402L
306  path& operator+=(basic_string_view<value_type> __x);
307 #endif
308 
309  template<typename _Source>
310  __detail::_Path<_Source>&
311  operator+=(_Source const& __x) { return concat(__x); }
312 
313  template<typename _CharT>
314  __detail::_Path<_CharT*, _CharT*>&
315  operator+=(_CharT __x);
316 
317  template<typename _Source>
318  __detail::_Path<_Source>&
319  concat(_Source const& __x)
320  {
321  return *this += _S_convert(__detail::_S_range_begin(__x),
322  __detail::_S_range_end(__x));
323  }
324 
325  template<typename _InputIterator>
326  __detail::_Path<_InputIterator, _InputIterator>&
327  concat(_InputIterator __first, _InputIterator __last)
328  { return *this += _S_convert(__first, __last); }
329 
330  // modifiers
331 
332  void clear() noexcept { _M_pathname.clear(); _M_split_cmpts(); }
333 
334  path& make_preferred();
335  path& remove_filename();
336  path& replace_filename(const path& __replacement);
337  path& replace_extension(const path& __replacement = path());
338 
339  void swap(path& __rhs) noexcept;
340 
341  // native format observers
342 
343  const string_type& native() const noexcept { return _M_pathname; }
344  const value_type* c_str() const noexcept { return _M_pathname.c_str(); }
345  operator string_type() const { return _M_pathname; }
346 
347  template<typename _CharT, typename _Traits = std::char_traits<_CharT>,
348  typename _Allocator = std::allocator<_CharT>>
350  string(const _Allocator& __a = _Allocator()) const;
351 
352  std::string string() const;
353 #if _GLIBCXX_USE_WCHAR_T
354  std::wstring wstring() const;
355 #endif
356 #ifdef _GLIBCXX_USE_CHAR8_T
357  __attribute__((__abi_tag__("__u8")))
358  std::u8string u8string() const;
359 #else
360  std::string u8string() const;
361 #endif // _GLIBCXX_USE_CHAR8_T
362  std::u16string u16string() const;
363  std::u32string u32string() const;
364 
365  // generic format observers
366  template<typename _CharT, typename _Traits = std::char_traits<_CharT>,
367  typename _Allocator = std::allocator<_CharT>>
369  generic_string(const _Allocator& __a = _Allocator()) const;
370 
371  std::string generic_string() const;
372 #if _GLIBCXX_USE_WCHAR_T
373  std::wstring generic_wstring() const;
374 #endif
375 #ifdef _GLIBCXX_USE_CHAR8_T
376  __attribute__((__abi_tag__("__u8")))
377  std::u8string generic_u8string() const;
378 #else
379  std::string generic_u8string() const;
380 #endif // _GLIBCXX_USE_CHAR8_T
381  std::u16string generic_u16string() const;
382  std::u32string generic_u32string() const;
383 
384  // compare
385 
386  int compare(const path& __p) const noexcept;
387  int compare(const string_type& __s) const;
388  int compare(const value_type* __s) const;
389 #if __cplusplus >= 201402L
390  int compare(const basic_string_view<value_type> __s) const;
391 #endif
392 
393  // decomposition
394 
395  path root_name() const;
396  path root_directory() const;
397  path root_path() const;
398  path relative_path() const;
399  path parent_path() const;
400  path filename() const;
401  path stem() const;
402  path extension() const;
403 
404  // query
405 
406  _GLIBCXX_NODISCARD bool empty() const noexcept { return _M_pathname.empty(); }
407  bool has_root_name() const;
408  bool has_root_directory() const;
409  bool has_root_path() const;
410  bool has_relative_path() const;
411  bool has_parent_path() const;
412  bool has_filename() const;
413  bool has_stem() const;
414  bool has_extension() const;
415  bool is_absolute() const;
416  bool is_relative() const { return !is_absolute(); }
417 
418  // iterators
419  class iterator;
420  typedef iterator const_iterator;
421 
422  iterator begin() const;
423  iterator end() const;
424 
425  /// @cond undocumented
426  // Create a basic_string by reading until a null character.
427  template<typename _InputIterator,
428  typename _Traits = std::iterator_traits<_InputIterator>,
429  typename _CharT
430  = typename std::remove_cv<typename _Traits::value_type>::type>
432  _S_string_from_iter(_InputIterator __source)
433  {
435  for (_CharT __ch = *__source; __ch != _CharT(); __ch = *++__source)
436  __str.push_back(__ch);
437  return __str;
438  }
439  /// @endcond
440 
441  private:
442  enum class _Type : unsigned char {
443  _Multi, _Root_name, _Root_dir, _Filename
444  };
445 
446  path(string_type __str, _Type __type) : _M_pathname(__str), _M_type(__type)
447  {
448  __glibcxx_assert(!empty());
449  __glibcxx_assert(_M_type != _Type::_Multi);
450  }
451 
452  enum class _Split { _Stem, _Extension };
453 
454  path& _M_append(const string_type& __str)
455  {
456  if (!_M_pathname.empty() && !_S_is_dir_sep(_M_pathname.back())
457  && !__str.empty() && !_S_is_dir_sep(__str.front()))
458  _M_pathname += preferred_separator;
459  _M_pathname += __str;
460  _M_split_cmpts();
461  return *this;
462  }
463 
464  pair<const string_type*, size_t> _M_find_extension() const;
465 
466  template<typename _CharT>
467  struct _Cvt;
468 
469  static string_type
470  _S_convert(value_type* __src, __detail::__null_terminated)
471  { return string_type(__src); }
472 
473  static string_type
474  _S_convert(const value_type* __src, __detail::__null_terminated)
475  { return string_type(__src); }
476 
477  template<typename _Iter>
478  static string_type
479  _S_convert(_Iter __first, _Iter __last)
480  {
481  using __value_type = typename std::iterator_traits<_Iter>::value_type;
482  return _Cvt<typename remove_cv<__value_type>::type>::
483  _S_convert(__first, __last);
484  }
485 
486  template<typename _InputIterator>
487  static string_type
488  _S_convert(_InputIterator __src, __detail::__null_terminated)
489  {
490  auto __s = _S_string_from_iter(__src);
491  return _S_convert(__s.c_str(), __s.c_str() + __s.size());
492  }
493 
494  static string_type
495  _S_convert_loc(const char* __first, const char* __last,
496  const std::locale& __loc);
497 
498  static string_type
499  _S_convert_loc(char* __first, char* __last, const std::locale& __loc)
500  {
501  return _S_convert_loc(const_cast<const char*>(__first),
502  const_cast<const char*>(__last), __loc);
503  }
504 
505  template<typename _Iter>
506  static string_type
507  _S_convert_loc(_Iter __first, _Iter __last, const std::locale& __loc)
508  {
509  const std::string __str(__first, __last);
510  return _S_convert_loc(__str.data(), __str.data()+__str.size(), __loc);
511  }
512 
513  template<typename _InputIterator>
514  static string_type
515  _S_convert_loc(_InputIterator __src, __detail::__null_terminated,
516  const std::locale& __loc)
517  {
518  const std::string __s = _S_string_from_iter(__src);
519  return _S_convert_loc(__s.data(), __s.data() + __s.size(), __loc);
520  }
521 
522  static bool _S_is_dir_sep(value_type __ch)
523  {
524 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
525  return __ch == L'/' || __ch == preferred_separator;
526 #else
527  return __ch == '/';
528 #endif
529  }
530 
531  void _M_split_cmpts();
532  void _M_trim();
533  void _M_add_root_name(size_t __n);
534  void _M_add_root_dir(size_t __pos);
535  void _M_add_filename(size_t __pos, size_t __n);
536 
537  string_type _M_pathname;
538 
539  struct _Cmpt;
540  using _List = _GLIBCXX_STD_C::vector<_Cmpt>;
541  _List _M_cmpts; // empty unless _M_type == _Type::_Multi
542  _Type _M_type = _Type::_Multi;
543  };
544 
545  /// @relates std::experimental::filesystem::path @{
546 
547  /// Swap overload for paths
548  inline void swap(path& __lhs, path& __rhs) noexcept { __lhs.swap(__rhs); }
549 
550  /// Compute a hash value for a path
551  size_t hash_value(const path& __p) noexcept;
552 
553  /// Compare paths
554  inline bool operator<(const path& __lhs, const path& __rhs) noexcept
555  { return __lhs.compare(__rhs) < 0; }
556 
557  /// Compare paths
558  inline bool operator<=(const path& __lhs, const path& __rhs) noexcept
559  { return !(__rhs < __lhs); }
560 
561  /// Compare paths
562  inline bool operator>(const path& __lhs, const path& __rhs) noexcept
563  { return __rhs < __lhs; }
564 
565  /// Compare paths
566  inline bool operator>=(const path& __lhs, const path& __rhs) noexcept
567  { return !(__lhs < __rhs); }
568 
569  /// Compare paths
570  inline bool operator==(const path& __lhs, const path& __rhs) noexcept
571  { return __lhs.compare(__rhs) == 0; }
572 
573  /// Compare paths
574  inline bool operator!=(const path& __lhs, const path& __rhs) noexcept
575  { return !(__lhs == __rhs); }
576 
577  /// Append one path to another
578  inline path operator/(const path& __lhs, const path& __rhs)
579  {
580  path __result(__lhs);
581  __result /= __rhs;
582  return __result;
583  }
584 
585  /// Write a path to a stream
586  template<typename _CharT, typename _Traits>
587  basic_ostream<_CharT, _Traits>&
588  operator<<(basic_ostream<_CharT, _Traits>& __os, const path& __p)
589  {
590  auto __tmp = __p.string<_CharT, _Traits>();
591  using __quoted_string
592  = std::__detail::_Quoted_string<decltype(__tmp)&, _CharT>;
593  __os << __quoted_string{__tmp, _CharT('"'), _CharT('\\')};
594  return __os;
595  }
596 
597  /// Read a path from a stream
598  template<typename _CharT, typename _Traits>
599  basic_istream<_CharT, _Traits>&
600  operator>>(basic_istream<_CharT, _Traits>& __is, path& __p)
601  {
602  basic_string<_CharT, _Traits> __tmp;
603  using __quoted_string
604  = std::__detail::_Quoted_string<decltype(__tmp)&, _CharT>;
605  if (__is >> __quoted_string{ __tmp, _CharT('"'), _CharT('\\') })
606  __p = std::move(__tmp);
607  return __is;
608  }
609 
610  /// Create a path from a UTF-8-encoded sequence of char
611 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
612  template<typename _InputIterator>
613  inline path
614  __u8path(_InputIterator __first, _InputIterator __last, char)
615  {
616  // XXX This assumes native wide encoding is UTF-16.
617  std::codecvt_utf8_utf16<path::value_type> __cvt;
618  path::string_type __tmp;
619  const std::string __u8str{__first, __last};
620  const char* const __ptr = __u8str.data();
621  if (__str_codecvt_in_all(__ptr, __ptr + __u8str.size(), __tmp, __cvt))
622  return path{ __tmp };
623  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
624  "Cannot convert character sequence",
625  std::make_error_code(errc::illegal_byte_sequence)));
626  }
627 
628 #ifdef _GLIBCXX_USE_CHAR8_T
629  template<typename _InputIterator>
630  inline path
631  __u8path(_InputIterator __first, _InputIterator __last, char8_t)
632  {
633  return path{ __first, __last };
634  }
635 #endif // _GLIBCXX_USE_CHAR8_T
636 #endif // _GLIBCXX_FILESYSTEM_IS_WINDOWS
637 
638  template<typename _InputIterator,
639  typename _Require = __detail::_Path<_InputIterator, _InputIterator>,
640  typename _CharT =
641  __detail::__value_type_is_char_or_char8_t<_InputIterator>>
642  inline path
643  u8path(_InputIterator __first, _InputIterator __last)
644  {
645 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
646  return __u8path(__first, __last, _CharT{});
647 #else
648  return path{ __first, __last };
649 #endif
650  }
651 
652  /// Create a path from a UTF-8-encoded sequence of char
653 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
654  inline path
655  __u8path(const string& __s, char)
656  {
657  return filesystem::u8path(__s.data(), __s.data() + __s.size());
658  }
659 
660  template<typename _Source>
661  inline __enable_if_t<is_convertible<const _Source&, string>::value, path>
662  __u8path(const _Source& __source, char)
663  {
664  std::string __s = __source;
665  return filesystem::u8path(__s.data(), __s.data() + __s.size());
666  }
667 
668  template<typename _Source>
669  inline __enable_if_t<!is_convertible<const _Source&, string>::value, path>
670  __u8path(const _Source& __source, char)
671  {
672  std::string __s = path::_S_string_from_iter(__source);
673  return filesystem::u8path(__s.data(), __s.data() + __s.size());
674  }
675 
676 #ifdef _GLIBCXX_USE_CHAR8_T
677  template<typename _Source>
678  inline path
679  __u8path(const _Source& __source, char8_t)
680  {
681  return path{ __source };
682  }
683 #endif // _GLIBCXX_USE_CHAR8_T
684 #endif // _GLIBCXX_FILESYSTEM_IS_WINDOWS
685 
686  template<typename _Source,
687  typename _Require = __detail::_Path<_Source>,
688  typename _CharT =
689  __detail::__value_type_is_char_or_char8_t<_Source>>
690  inline path
691  u8path(const _Source& __source)
692  {
693 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
694  return __u8path(__source, _CharT{});
695 #else
696  return path{ __source };
697 #endif
698  }
699 
700  /// @}
701 
702  /// Exception type thrown by the Filesystem TS library
704  {
705  public:
706  filesystem_error(const string& __what_arg, error_code __ec)
707  : system_error(__ec, __what_arg) { }
708 
709  filesystem_error(const string& __what_arg, const path& __p1,
710  error_code __ec)
711  : system_error(__ec, __what_arg), _M_path1(__p1) { }
712 
713  filesystem_error(const string& __what_arg, const path& __p1,
714  const path& __p2, error_code __ec)
715  : system_error(__ec, __what_arg), _M_path1(__p1), _M_path2(__p2)
716  { }
717 
718  ~filesystem_error();
719 
720  const path& path1() const noexcept { return _M_path1; }
721  const path& path2() const noexcept { return _M_path2; }
722  const char* what() const noexcept { return _M_what.c_str(); }
723 
724  private:
725  std::string _M_gen_what();
726 
727  path _M_path1;
728  path _M_path2;
729  std::string _M_what = _M_gen_what();
730  };
731 
732  /// @cond undocumented
733  struct path::_Cmpt : path
734  {
735  _Cmpt(string_type __s, _Type __t, size_t __pos)
736  : path(std::move(__s), __t), _M_pos(__pos) { }
737 
738  _Cmpt() : _M_pos(-1) { }
739 
740  size_t _M_pos;
741  };
742 
743  // specialize _Cvt for degenerate 'noconv' case
744  template<>
745  struct path::_Cvt<path::value_type>
746  {
747  template<typename _Iter>
748  static string_type
749  _S_convert(_Iter __first, _Iter __last)
750  { return string_type{__first, __last}; }
751  };
752 
753  template<typename _CharT>
754  struct path::_Cvt
755  {
756 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
757 #ifdef _GLIBCXX_USE_CHAR8_T
758  static string_type
759  _S_wconvert(const char8_t* __f, const char8_t* __l, const char8_t*)
760  {
761  const char* __f2 = (const char*)__f;
762  const char* __l2 = (const char*)__l;
763  std::wstring __wstr;
764  std::codecvt_utf8_utf16<wchar_t> __wcvt;
765  if (__str_codecvt_in_all(__f2, __l2, __wstr, __wcvt))
766  return __wstr;
767  }
768 #endif
769 
770  static string_type
771  _S_wconvert(const char* __f, const char* __l, const char*)
772  {
774  const auto& __cvt = std::use_facet<_Cvt>(std::locale{});
775  std::wstring __wstr;
776  if (__str_codecvt_in_all(__f, __l, __wstr, __cvt))
777  return __wstr;
778  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
779  "Cannot convert character sequence",
780  std::make_error_code(errc::illegal_byte_sequence)));
781  }
782 
783  static string_type
784  _S_wconvert(const _CharT* __f, const _CharT* __l, const void*)
785  {
786  struct _UCvt : std::codecvt<_CharT, char, std::mbstate_t>
787  { } __cvt;
788  std::string __str;
789  if (__str_codecvt_out_all(__f, __l, __str, __cvt))
790  {
791  const char* __f2 = __str.data();
792  const char* __l2 = __f2 + __str.size();
793  std::codecvt_utf8_utf16<wchar_t> __wcvt;
794  std::wstring __wstr;
795  if (__str_codecvt_in_all(__f2, __l2, __wstr, __wcvt))
796  return __wstr;
797  }
798  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
799  "Cannot convert character sequence",
800  std::make_error_code(errc::illegal_byte_sequence)));
801  }
802 
803  static string_type
804  _S_convert(const _CharT* __f, const _CharT* __l)
805  {
806  return _S_wconvert(__f, __l, (const _CharT*)nullptr);
807  }
808 #else
809  static string_type
810  _S_convert(const _CharT* __f, const _CharT* __l)
811  {
812 #ifdef _GLIBCXX_USE_CHAR8_T
813  if constexpr (is_same<_CharT, char8_t>::value)
814  return string_type(__f, __l);
815  else
816 #endif
817  {
818  struct _UCvt : std::codecvt<_CharT, char, std::mbstate_t>
819  { } __cvt;
820  std::string __str;
821  if (__str_codecvt_out_all(__f, __l, __str, __cvt))
822  return __str;
823  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
824  "Cannot convert character sequence",
825  std::make_error_code(errc::illegal_byte_sequence)));
826  }
827  }
828 #endif
829 
830  static string_type
831  _S_convert(_CharT* __f, _CharT* __l)
832  {
833  return _S_convert(const_cast<const _CharT*>(__f),
834  const_cast<const _CharT*>(__l));
835  }
836 
837  template<typename _Iter>
838  static string_type
839  _S_convert(_Iter __first, _Iter __last)
840  {
841  const std::basic_string<_CharT> __str(__first, __last);
842  return _S_convert(__str.data(), __str.data() + __str.size());
843  }
844 
845  template<typename _Iter, typename _Cont>
846  static string_type
847  _S_convert(__gnu_cxx::__normal_iterator<_Iter, _Cont> __first,
848  __gnu_cxx::__normal_iterator<_Iter, _Cont> __last)
849  { return _S_convert(__first.base(), __last.base()); }
850  };
851  /// @endcond
852 
853  /// An iterator for the components of a path
855  {
856  public:
857  using difference_type = std::ptrdiff_t;
858  using value_type = path;
859  using reference = const path&;
860  using pointer = const path*;
862 
863  iterator() : _M_path(nullptr), _M_cur(), _M_at_end() { }
864 
865  iterator(const iterator&) = default;
866  iterator& operator=(const iterator&) = default;
867 
868  reference operator*() const;
869  pointer operator->() const { return std::__addressof(**this); }
870 
871  iterator& operator++();
872  iterator operator++(int) { auto __tmp = *this; ++*this; return __tmp; }
873 
874  iterator& operator--();
875  iterator operator--(int) { auto __tmp = *this; --*this; return __tmp; }
876 
877  friend bool operator==(const iterator& __lhs, const iterator& __rhs)
878  { return __lhs._M_equals(__rhs); }
879 
880  friend bool operator!=(const iterator& __lhs, const iterator& __rhs)
881  { return !__lhs._M_equals(__rhs); }
882 
883  private:
884  friend class path;
885 
886  iterator(const path* __path, path::_List::const_iterator __iter)
887  : _M_path(__path), _M_cur(__iter), _M_at_end()
888  { }
889 
890  iterator(const path* __path, bool __at_end)
891  : _M_path(__path), _M_cur(), _M_at_end(__at_end)
892  { }
893 
894  bool _M_equals(iterator) const;
895 
896  const path* _M_path;
897  path::_List::const_iterator _M_cur;
898  bool _M_at_end; // only used when type != _Multi
899  };
900 
901 
902  inline path&
903  path::operator=(path&& __p) noexcept
904  {
905  _M_pathname = std::move(__p._M_pathname);
906  _M_cmpts = std::move(__p._M_cmpts);
907  _M_type = __p._M_type;
908  __p.clear();
909  return *this;
910  }
911 
912  inline path&
913  path::operator=(string_type&& __source)
914  { return *this = path(std::move(__source)); }
915 
916  inline path&
917  path::assign(string_type&& __source)
918  { return *this = path(std::move(__source)); }
919 
920  inline path&
921  path::operator+=(const path& __p)
922  {
923  return operator+=(__p.native());
924  }
925 
926  inline path&
927  path::operator+=(const string_type& __x)
928  {
929  _M_pathname += __x;
930  _M_split_cmpts();
931  return *this;
932  }
933 
934  inline path&
935  path::operator+=(const value_type* __x)
936  {
937  _M_pathname += __x;
938  _M_split_cmpts();
939  return *this;
940  }
941 
942  inline path&
943  path::operator+=(value_type __x)
944  {
945  _M_pathname += __x;
946  _M_split_cmpts();
947  return *this;
948  }
949 
950 #if __cplusplus >= 201402L
951  inline path&
952  path::operator+=(basic_string_view<value_type> __x)
953  {
954  _M_pathname.append(__x.data(), __x.size());
955  _M_split_cmpts();
956  return *this;
957  }
958 #endif
959 
960  template<typename _CharT>
961  inline __detail::_Path<_CharT*, _CharT*>&
962  path::operator+=(_CharT __x)
963  {
964  auto* __addr = std::__addressof(__x);
965  return concat(__addr, __addr + 1);
966  }
967 
968  inline path&
969  path::make_preferred()
970  {
971 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
972  std::replace(_M_pathname.begin(), _M_pathname.end(), L'/',
973  preferred_separator);
974 #endif
975  return *this;
976  }
977 
978  inline void path::swap(path& __rhs) noexcept
979  {
980  _M_pathname.swap(__rhs._M_pathname);
981  _M_cmpts.swap(__rhs._M_cmpts);
982  std::swap(_M_type, __rhs._M_type);
983  }
984 
985  template<typename _CharT, typename _Traits, typename _Allocator>
987  path::string(const _Allocator& __a) const
988  {
989  if (is_same<_CharT, value_type>::value)
990  return { _M_pathname.begin(), _M_pathname.end(), __a };
991 
992  using _WString = basic_string<_CharT, _Traits, _Allocator>;
993 
994  const value_type* __first = _M_pathname.data();
995  const value_type* __last = __first + _M_pathname.size();
996 
997 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
998  using _CharAlloc = __alloc_rebind<_Allocator, char>;
999  using _String = basic_string<char, char_traits<char>, _CharAlloc>;
1000 
1001  // First convert native string from UTF-16 to to UTF-8.
1002  // XXX This assumes that the execution wide-character set is UTF-16.
1003  codecvt_utf8_utf16<value_type> __cvt;
1004  _String __u8str{_CharAlloc{__a}};
1005  if (__str_codecvt_out_all(__first, __last, __u8str, __cvt))
1006  {
1007  struct
1008  {
1009  const _String*
1010  operator()(const _String& __from, _String&, true_type)
1011  { return std::__addressof(__from); }
1012 
1013  _WString*
1014  operator()(const _String& __from, _WString& __to, false_type)
1015  {
1016 #ifdef _GLIBCXX_USE_CHAR8_T
1017  if constexpr (is_same<_CharT, char8_t>::value)
1018  {
1019  __to.assign(__from.begin(), __from.end());
1020  return std::__addressof(__to);
1021  }
1022  else
1023 #endif
1024  {
1025  // Convert UTF-8 to wide string.
1026  struct _UCvt : std::codecvt<_CharT, char, std::mbstate_t>
1027  { } __cvt;
1028  const char* __f = __from.data();
1029  const char* __l = __f + __from.size();
1030  if (__str_codecvt_in_all(__f, __l, __to, __cvt))
1031  return std::__addressof(__to);
1032  }
1033  return nullptr;
1034  }
1035  } __dispatch;
1036  _WString __wstr(__a);
1037  if (auto* __p = __dispatch(__u8str, __wstr, is_same<_CharT, char>{}))
1038  return *__p;
1039  }
1040 #else
1041 #ifdef _GLIBCXX_USE_CHAR8_T
1042  if constexpr (is_same<_CharT, char8_t>::value)
1043  return _WString(__first, __last, __a);
1044  else
1045 #endif
1046  {
1047  struct _UCvt : std::codecvt<_CharT, char, std::mbstate_t> { } __cvt;
1048  _WString __wstr(__a);
1049  if (__str_codecvt_in_all(__first, __last, __wstr, __cvt))
1050  return __wstr;
1051  }
1052 #endif
1053  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
1054  "Cannot convert character sequence",
1055  std::make_error_code(errc::illegal_byte_sequence)));
1056  }
1057 
1058  inline std::string
1059  path::string() const { return string<char>(); }
1060 
1061 #if _GLIBCXX_USE_WCHAR_T
1062  inline std::wstring
1063  path::wstring() const { return string<wchar_t>(); }
1064 #endif
1065 
1066 #ifdef _GLIBCXX_USE_CHAR8_T
1067  inline std::u8string
1068  path::u8string() const { return string<char8_t>(); }
1069 #else
1070  inline std::string
1071  path::u8string() const
1072  {
1073 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1074  std::string __str;
1075  // convert from native wide encoding (assumed to be UTF-16) to UTF-8
1076  std::codecvt_utf8_utf16<value_type> __cvt;
1077  const value_type* __first = _M_pathname.data();
1078  const value_type* __last = __first + _M_pathname.size();
1079  if (__str_codecvt_out_all(__first, __last, __str, __cvt))
1080  return __str;
1081  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
1082  "Cannot convert character sequence",
1083  std::make_error_code(errc::illegal_byte_sequence)));
1084 #else
1085  return _M_pathname;
1086 #endif
1087  }
1088 #endif // _GLIBCXX_USE_CHAR8_T
1089 
1090  inline std::u16string
1091  path::u16string() const { return string<char16_t>(); }
1092 
1093  inline std::u32string
1094  path::u32string() const { return string<char32_t>(); }
1095 
1096  template<typename _CharT, typename _Traits, typename _Allocator>
1098  path::generic_string(const _Allocator& __a) const
1099  {
1100 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1101  const _CharT __slash = is_same<_CharT, wchar_t>::value
1102  ? _CharT(L'/')
1103  : _CharT('/'); // Assume value is correct for the encoding.
1104 #else
1105  const _CharT __slash = _CharT('/');
1106 #endif
1107  basic_string<_CharT, _Traits, _Allocator> __str(__a);
1108  __str.reserve(_M_pathname.size());
1109  bool __add_slash = false;
1110  for (auto& __elem : *this)
1111  {
1112  if (__elem._M_type == _Type::_Root_dir)
1113  {
1114  __str += __slash;
1115  continue;
1116  }
1117  if (__add_slash)
1118  __str += __slash;
1119  __str += __elem.string<_CharT, _Traits, _Allocator>(__a);
1120  __add_slash = __elem._M_type == _Type::_Filename;
1121  }
1122  return __str;
1123  }
1124 
1125  inline std::string
1126  path::generic_string() const { return generic_string<char>(); }
1127 
1128 #if _GLIBCXX_USE_WCHAR_T
1129  inline std::wstring
1130  path::generic_wstring() const { return generic_string<wchar_t>(); }
1131 #endif
1132 
1133 #ifdef _GLIBCXX_USE_CHAR8_T
1134  inline std::u8string
1135  path::generic_u8string() const { return generic_string<char8_t>(); }
1136 #else
1137  inline std::string
1138  path::generic_u8string() const { return generic_string<char>(); }
1139 #endif
1140 
1141  inline std::u16string
1142  path::generic_u16string() const { return generic_string<char16_t>(); }
1143 
1144  inline std::u32string
1145  path::generic_u32string() const { return generic_string<char32_t>(); }
1146 
1147  inline int
1148  path::compare(const string_type& __s) const { return compare(path(__s)); }
1149 
1150  inline int
1151  path::compare(const value_type* __s) const { return compare(path(__s)); }
1152 
1153 #if __cplusplus >= 201402L
1154  inline int
1155  path::compare(basic_string_view<value_type> __s) const
1156  { return compare(path(__s)); }
1157 #endif
1158 
1159  inline path
1160  path::filename() const { return empty() ? path() : *--end(); }
1161 
1162  inline path
1163  path::stem() const
1164  {
1165  auto ext = _M_find_extension();
1166  if (ext.first && ext.second != 0)
1167  return path{ext.first->substr(0, ext.second)};
1168  return {};
1169  }
1170 
1171  inline path
1172  path::extension() const
1173  {
1174  auto ext = _M_find_extension();
1175  if (ext.first && ext.second != string_type::npos)
1176  return path{ext.first->substr(ext.second)};
1177  return {};
1178  }
1179 
1180  inline bool
1181  path::has_stem() const
1182  {
1183  auto ext = _M_find_extension();
1184  return ext.first && ext.second != 0;
1185  }
1186 
1187  inline bool
1188  path::has_extension() const
1189  {
1190  auto ext = _M_find_extension();
1191  return ext.first && ext.second != string_type::npos;
1192  }
1193 
1194  inline bool
1195  path::is_absolute() const
1196  {
1197 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1198  return has_root_name() && has_root_directory();
1199 #else
1200  return has_root_directory();
1201 #endif
1202  }
1203 
1204  inline path::iterator
1205  path::begin() const
1206  {
1207  if (_M_type == _Type::_Multi)
1208  return iterator(this, _M_cmpts.begin());
1209  return iterator(this, false);
1210  }
1211 
1212  inline path::iterator
1213  path::end() const
1214  {
1215  if (_M_type == _Type::_Multi)
1216  return iterator(this, _M_cmpts.end());
1217  return iterator(this, true);
1218  }
1219 
1220  inline path::iterator&
1221  path::iterator::operator++()
1222  {
1223  __glibcxx_assert(_M_path != nullptr);
1224  if (_M_path->_M_type == _Type::_Multi)
1225  {
1226  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end());
1227  ++_M_cur;
1228  }
1229  else
1230  {
1231  __glibcxx_assert(!_M_at_end);
1232  _M_at_end = true;
1233  }
1234  return *this;
1235  }
1236 
1237  inline path::iterator&
1238  path::iterator::operator--()
1239  {
1240  __glibcxx_assert(_M_path != nullptr);
1241  if (_M_path->_M_type == _Type::_Multi)
1242  {
1243  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.begin());
1244  --_M_cur;
1245  }
1246  else
1247  {
1248  __glibcxx_assert(_M_at_end);
1249  _M_at_end = false;
1250  }
1251  return *this;
1252  }
1253 
1254  inline path::iterator::reference
1255  path::iterator::operator*() const
1256  {
1257  __glibcxx_assert(_M_path != nullptr);
1258  if (_M_path->_M_type == _Type::_Multi)
1259  {
1260  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end());
1261  return *_M_cur;
1262  }
1263  return *_M_path;
1264  }
1265 
1266  inline bool
1267  path::iterator::_M_equals(iterator __rhs) const
1268  {
1269  if (_M_path != __rhs._M_path)
1270  return false;
1271  if (_M_path == nullptr)
1272  return true;
1273  if (_M_path->_M_type == path::_Type::_Multi)
1274  return _M_cur == __rhs._M_cur;
1275  return _M_at_end == __rhs._M_at_end;
1276  }
1277 
1278  // @} group filesystem-ts
1279 _GLIBCXX_END_NAMESPACE_CXX11
1280 } // namespace v1
1281 } // namespace filesystem
1282 } // namespace experimental
1283 
1284 _GLIBCXX_END_NAMESPACE_VERSION
1285 } // namespace std
1286 
1287 #endif // C++11
1288 
1289 #endif // _GLIBCXX_EXPERIMENTAL_FS_PATH_H
auto_ptr & operator=(auto_ptr &__a)
auto_ptr assignment operator.
Definition: auto_ptr.h:47
constexpr complex< _Tp > operator/(const complex< _Tp > &__x, const complex< _Tp > &__y)
Return new complex value x divided by y.
Definition: complex:422
integral_constant< bool, true > true_type
The type used as a compile-time boolean with true value.
Definition: type_traits:75
integral_constant< bool, false > false_type
The type used as a compile-time boolean with false value.
Definition: type_traits:78
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:101
void swap(any &__x, any &__y) noexcept
Exchange the states of two any objects.
Definition: any:412
_Tp * begin(valarray< _Tp > &__va)
Return an iterator pointing to the first element of the valarray.
Definition: valarray:1214
_Tp * end(valarray< _Tp > &__va)
Return an iterator pointing to one past the last element of the valarray.
Definition: valarray:1234
basic_string< char > string
A string of char.
Definition: stringfwd.h:74
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:1472
A non-owning reference to a string.
Definition: string_view:100
An exception type that includes an error_code value.
Definition: system_error:431
integral_constant
Definition: type_traits:58
is_same
Definition: type_traits:1360
is_base_of
Definition: type_traits:1373
Define a member typedef type only if a boolean constant is true.
Definition: type_traits:2143
void push_back(_CharT __c)
Append a single character.
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.
size_type size() const noexcept
Returns the number of characters in the string, not including any null-termination.
const _CharT * data() const noexcept
Return const pointer to contents.
basic_string & append(const basic_string &__str)
Append a string to this string.
void clear() noexcept
bool empty() const noexcept
reference back()
static const size_type npos
Value returned by various member functions when they fail.
Primary class template codecvt.
Definition: codecvt.h:279
Class codecvt<wchar_t, char, mbstate_t> specialization.
Definition: codecvt.h:406
Traits class for iterators.
Container class for localization functionality.
Struct for delimited strings.
Definition: quoted_string.h:50
Marking input iterators.
Bidirectional iterators support a superset of forward iterator operations.
Common iterator class.
Struct holding two objects of arbitrary type.
Definition: stl_pair.h:213
iterator begin() noexcept
Definition: stl_vector.h:811
iterator end() noexcept
Definition: stl_vector.h:829
Exception type thrown by the Filesystem TS library.
A non-owning reference to a string.