libstdc++
fs_path.h
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1 // Class filesystem::path -*- C++ -*-
2 
3 // Copyright (C) 2014-2016 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 namespace experimental
59 {
60 namespace filesystem
61 {
62 inline namespace v1
63 {
64 _GLIBCXX_BEGIN_NAMESPACE_VERSION
65 _GLIBCXX_BEGIN_NAMESPACE_CXX11
66 
67 #if __cplusplus == 201402L
68  using std::experimental::basic_string_view;
69 #elif __cplusplus > 201402L
70  using std::basic_string_view;
71 #endif
72 
73  /**
74  * @ingroup filesystem
75  * @{
76  */
77 
78  /// A filesystem path.
79  class path
80  {
81  template<typename _CharT>
82  struct __is_encoded_char : std::false_type { };
83 
84  template<typename _Iter,
85  typename _Iter_traits = std::iterator_traits<_Iter>>
86  using __is_path_iter_src
87  = __and_<__is_encoded_char<typename _Iter_traits::value_type>,
88  std::is_base_of<std::input_iterator_tag,
89  typename _Iter_traits::iterator_category>>;
90 
91  template<typename _Iter>
92  static __is_path_iter_src<_Iter>
93  __is_path_src(_Iter, int);
94 
95  template<typename _CharT, typename _Traits, typename _Alloc>
96  static __is_encoded_char<_CharT>
97  __is_path_src(const basic_string<_CharT, _Traits, _Alloc>&, int);
98 
99 #if __cplusplus >= 201402L
100  template<typename _CharT, typename _Traits>
101  static __is_encoded_char<_CharT>
102  __is_path_src(const basic_string_view<_CharT, _Traits>&, int);
103 #endif
104 
105  template<typename _Unknown>
106  static std::false_type
107  __is_path_src(const _Unknown&, ...);
108 
109  template<typename _Tp1, typename _Tp2>
110  struct __constructible_from;
111 
112  template<typename _Iter>
113  struct __constructible_from<_Iter, _Iter>
114  : __is_path_iter_src<_Iter>
115  { };
116 
117  template<typename _Source>
118  struct __constructible_from<_Source, void>
119  : decltype(__is_path_src(std::declval<_Source>(), 0))
120  { };
121 
122  template<typename _Tp1, typename _Tp2 = void>
123  using _Path = typename
124  std::enable_if<__and_<__not_<is_same<_Tp1, path>>,
125  __constructible_from<_Tp1, _Tp2>>::value,
126  path>::type;
127 
128  template<typename _Source>
129  static _Source
130  _S_range_begin(_Source __begin) { return __begin; }
131 
132  struct __null_terminated { };
133 
134  template<typename _Source>
135  static __null_terminated
136  _S_range_end(_Source) { return {}; }
137 
138  template<typename _CharT, typename _Traits, typename _Alloc>
139  static const _CharT*
140  _S_range_begin(const basic_string<_CharT, _Traits, _Alloc>& __str)
141  { return __str.data(); }
142 
143  template<typename _CharT, typename _Traits, typename _Alloc>
144  static const _CharT*
145  _S_range_end(const basic_string<_CharT, _Traits, _Alloc>& __str)
146  { return __str.data() + __str.size(); }
147 
148 #if __cplusplus >= 201402L
149  template<typename _CharT, typename _Traits>
150  static const _CharT*
151  _S_range_begin(const basic_string_view<_CharT, _Traits>& __str)
152  { return __str.data(); }
153 
154  template<typename _CharT, typename _Traits>
155  static const _CharT*
156  _S_range_end(const basic_string_view<_CharT, _Traits>& __str)
157  { return __str.data() + __str.size(); }
158 #endif
159 
160  template<typename _Tp,
161  typename _Iter = decltype(_S_range_begin(std::declval<_Tp>())),
162  typename _Val = typename std::iterator_traits<_Iter>::value_type>
163  using __value_type_is_char
164  = typename std::enable_if<std::is_same<_Val, char>::value>::type;
165 
166  public:
167 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
168  typedef wchar_t value_type;
169  static constexpr value_type preferred_separator = L'\\';
170 #else
171  typedef char value_type;
172  static constexpr value_type preferred_separator = '/';
173 #endif
175 
176  // constructors and destructor
177 
178  path() noexcept { }
179 
180  path(const path& __p) = default;
181 
182  path(path&& __p) noexcept
183  : _M_pathname(std::move(__p._M_pathname)), _M_type(__p._M_type)
184  {
185  _M_split_cmpts();
186  __p.clear();
187  }
188 
189  path(string_type&& __source)
190  : _M_pathname(std::move(__source))
191  { _M_split_cmpts(); }
192 
193  template<typename _Source,
194  typename _Require = _Path<_Source>>
195  path(_Source const& __source)
196  : _M_pathname(_S_convert(_S_range_begin(__source),
197  _S_range_end(__source)))
198  { _M_split_cmpts(); }
199 
200  template<typename _InputIterator,
201  typename _Require = _Path<_InputIterator, _InputIterator>>
202  path(_InputIterator __first, _InputIterator __last)
203  : _M_pathname(_S_convert(__first, __last))
204  { _M_split_cmpts(); }
205 
206  template<typename _Source,
207  typename _Require = _Path<_Source>,
208  typename _Require2 = __value_type_is_char<_Source>>
209  path(_Source const& __source, const locale& __loc)
210  : _M_pathname(_S_convert_loc(_S_range_begin(__source),
211  _S_range_end(__source), __loc))
212  { _M_split_cmpts(); }
213 
214  template<typename _InputIterator,
215  typename _Require = _Path<_InputIterator, _InputIterator>,
216  typename _Require2 = __value_type_is_char<_InputIterator>>
217  path(_InputIterator __first, _InputIterator __last, const locale& __loc)
218  : _M_pathname(_S_convert_loc(__first, __last, __loc))
219  { _M_split_cmpts(); }
220 
221  ~path() = default;
222 
223  // assignments
224 
225  path& operator=(const path& __p) = default;
226  path& operator=(path&& __p) noexcept;
227  path& operator=(string_type&& __source);
228  path& assign(string_type&& __source);
229 
230  template<typename _Source>
231  _Path<_Source>&
232  operator=(_Source const& __source)
233  { return *this = path(__source); }
234 
235  template<typename _Source>
236  _Path<_Source>&
237  assign(_Source const& __source)
238  { return *this = path(__source); }
239 
240  template<typename _InputIterator>
241  _Path<_InputIterator, _InputIterator>&
242  assign(_InputIterator __first, _InputIterator __last)
243  { return *this = path(__first, __last); }
244 
245  // appends
246 
247  path& operator/=(const path& __p) { return _M_append(__p._M_pathname); }
248 
249  template <class _Source>
250  _Path<_Source>&
251  operator/=(_Source const& __source)
252  { return append(__source); }
253 
254  template<typename _Source>
255  _Path<_Source>&
256  append(_Source const& __source)
257  {
258  return _M_append(_S_convert(_S_range_begin(__source),
259  _S_range_end(__source)));
260  }
261 
262  template<typename _InputIterator>
263  _Path<_InputIterator, _InputIterator>&
264  append(_InputIterator __first, _InputIterator __last)
265  { return _M_append(_S_convert(__first, __last)); }
266 
267  // concatenation
268 
269  path& operator+=(const path& __x);
270  path& operator+=(const string_type& __x);
271  path& operator+=(const value_type* __x);
272  path& operator+=(value_type __x);
273 #if __cplusplus >= 201402L
274  path& operator+=(basic_string_view<value_type> __x);
275 #endif
276 
277  template<typename _Source>
278  _Path<_Source>&
279  operator+=(_Source const& __x) { return concat(__x); }
280 
281  template<typename _CharT>
282  _Path<_CharT*, _CharT*>&
283  operator+=(_CharT __x);
284 
285  template<typename _Source>
286  _Path<_Source>&
287  concat(_Source const& __x)
288  { return *this += _S_convert(_S_range_begin(__x), _S_range_end(__x)); }
289 
290  template<typename _InputIterator>
291  _Path<_InputIterator, _InputIterator>&
292  concat(_InputIterator __first, _InputIterator __last)
293  { return *this += _S_convert(__first, __last); }
294 
295  // modifiers
296 
297  void clear() noexcept { _M_pathname.clear(); _M_split_cmpts(); }
298 
299  path& make_preferred();
300  path& remove_filename();
301  path& replace_filename(const path& __replacement);
302  path& replace_extension(const path& __replacement = path());
303 
304  void swap(path& __rhs) noexcept;
305 
306  // native format observers
307 
308  const string_type& native() const noexcept { return _M_pathname; }
309  const value_type* c_str() const noexcept { return _M_pathname.c_str(); }
310  operator string_type() const { return _M_pathname; }
311 
312  template<typename _CharT, typename _Traits = std::char_traits<_CharT>,
313  typename _Allocator = std::allocator<_CharT>>
315  string(const _Allocator& __a = _Allocator()) const;
316 
317  std::string string() const;
318 #if _GLIBCXX_USE_WCHAR_T
319  std::wstring wstring() const;
320 #endif
321  std::string u8string() const;
322  std::u16string u16string() const;
323  std::u32string u32string() const;
324 
325  // generic format observers
326  template<typename _CharT, typename _Traits = std::char_traits<_CharT>,
327  typename _Allocator = std::allocator<_CharT>>
329  generic_string(const _Allocator& __a = _Allocator()) const;
330 
331  std::string generic_string() const;
332 #if _GLIBCXX_USE_WCHAR_T
333  std::wstring generic_wstring() const;
334 #endif
335  std::string generic_u8string() const;
336  std::u16string generic_u16string() const;
337  std::u32string generic_u32string() const;
338 
339  // compare
340 
341  int compare(const path& __p) const noexcept;
342  int compare(const string_type& __s) const;
343  int compare(const value_type* __s) const;
344 #if __cplusplus >= 201402L
345  int compare(const basic_string_view<value_type> __s) const;
346 #endif
347 
348  // decomposition
349 
350  path root_name() const;
351  path root_directory() const;
352  path root_path() const;
353  path relative_path() const;
354  path parent_path() const;
355  path filename() const;
356  path stem() const;
357  path extension() const;
358 
359  // query
360 
361  bool empty() const noexcept { return _M_pathname.empty(); }
362  bool has_root_name() const;
363  bool has_root_directory() const;
364  bool has_root_path() const;
365  bool has_relative_path() const;
366  bool has_parent_path() const;
367  bool has_filename() const;
368  bool has_stem() const;
369  bool has_extension() const;
370  bool is_absolute() const;
371  bool is_relative() const { return !is_absolute(); }
372 
373  // iterators
374  class iterator;
375  typedef iterator const_iterator;
376 
377  iterator begin() const;
378  iterator end() const;
379 
380  private:
381  enum class _Type : unsigned char {
382  _Multi, _Root_name, _Root_dir, _Filename
383  };
384 
385  path(string_type __str, _Type __type) : _M_pathname(__str), _M_type(__type)
386  {
387  __glibcxx_assert(!empty());
388  __glibcxx_assert(_M_type != _Type::_Multi);
389  }
390 
391  enum class _Split { _Stem, _Extension };
392 
393  path& _M_append(const string_type& __str)
394  {
395  if (!_M_pathname.empty() && !_S_is_dir_sep(_M_pathname.back())
396  && !__str.empty() && !_S_is_dir_sep(__str.front()))
397  _M_pathname += preferred_separator;
398  _M_pathname += __str;
399  _M_split_cmpts();
400  return *this;
401  }
402 
403  pair<const string_type*, size_t> _M_find_extension() const;
404 
405  template<typename _CharT>
406  struct _Cvt;
407 
408  static string_type
409  _S_convert(value_type* __src, __null_terminated)
410  { return string_type(__src); }
411 
412  static string_type
413  _S_convert(const value_type* __src, __null_terminated)
414  { return string_type(__src); }
415 
416  template<typename _Iter>
417  static string_type
418  _S_convert(_Iter __first, _Iter __last)
419  {
420  using __value_type = typename std::iterator_traits<_Iter>::value_type;
421  return _Cvt<remove_cv_t<__value_type>>::_S_convert(__first, __last);
422  }
423 
424  template<typename _InputIterator>
425  static string_type
426  _S_convert(_InputIterator __src, __null_terminated)
427  {
428  using _Tp = typename std::iterator_traits<_InputIterator>::value_type;
430  for (; *__src != _Tp{}; ++__src)
431  __tmp.push_back(*__src);
432  return _S_convert(__tmp.c_str(), __tmp.c_str() + __tmp.size());
433  }
434 
435  static string_type
436  _S_convert_loc(const char* __first, const char* __last,
437  const std::locale& __loc);
438 
439  template<typename _Iter>
440  static string_type
441  _S_convert_loc(_Iter __first, _Iter __last, const std::locale& __loc)
442  {
443  const std::string __str(__first, __last);
444  return _S_convert_loc(__str.data(), __str.data()+__str.size(), __loc);
445  }
446 
447  template<typename _InputIterator>
448  static string_type
449  _S_convert_loc(_InputIterator __src, __null_terminated,
450  const std::locale& __loc)
451  {
452  std::string __tmp;
453  while (*__src != '\0')
454  __tmp.push_back(*__src++);
455  return _S_convert_loc(__tmp.data(), __tmp.data()+__tmp.size(), __loc);
456  }
457 
458  bool _S_is_dir_sep(value_type __ch)
459  {
460 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
461  return __ch == L'/' || __ch == preferred_separator;
462 #else
463  return __ch == '/';
464 #endif
465  }
466 
467  void _M_split_cmpts();
468  void _M_trim();
469  void _M_add_root_name(size_t __n);
470  void _M_add_root_dir(size_t __pos);
471  void _M_add_filename(size_t __pos, size_t __n);
472 
473  string_type _M_pathname;
474 
475  struct _Cmpt;
476  using _List = _GLIBCXX_STD_C::vector<_Cmpt>;
477  _List _M_cmpts; // empty unless _M_type == _Type::_Multi
478  _Type _M_type = _Type::_Multi;
479  };
480 
481  inline void swap(path& __lhs, path& __rhs) noexcept { __lhs.swap(__rhs); }
482 
483  size_t hash_value(const path& __p) noexcept;
484 
485  /// Compare paths
486  inline bool operator<(const path& __lhs, const path& __rhs) noexcept
487  { return __lhs.compare(__rhs) < 0; }
488 
489  /// Compare paths
490  inline bool operator<=(const path& __lhs, const path& __rhs) noexcept
491  { return !(__rhs < __lhs); }
492 
493  /// Compare paths
494  inline bool operator>(const path& __lhs, const path& __rhs) noexcept
495  { return __rhs < __lhs; }
496 
497  /// Compare paths
498  inline bool operator>=(const path& __lhs, const path& __rhs) noexcept
499  { return !(__lhs < __rhs); }
500 
501  /// Compare paths
502  inline bool operator==(const path& __lhs, const path& __rhs) noexcept
503  { return __lhs.compare(__rhs) == 0; }
504 
505  /// Compare paths
506  inline bool operator!=(const path& __lhs, const path& __rhs) noexcept
507  { return !(__lhs == __rhs); }
508 
509  /// Append one path to another
510  inline path operator/(const path& __lhs, const path& __rhs)
511  { return path(__lhs) /= __rhs; }
512 
513  /// Write a path to a stream
514  template<typename _CharT, typename _Traits>
516  operator<<(basic_ostream<_CharT, _Traits>& __os, const path& __p)
517  {
518  auto __tmp = __p.string<_CharT, _Traits>();
519  using __quoted_string
521  __os << __quoted_string{__tmp, '"', '\\'};
522  return __os;
523  }
524 
525  /// Read a path from a stream
526  template<typename _CharT, typename _Traits>
529  {
531  using __quoted_string
533  if (__is >> __quoted_string{ __tmp, '"', '\\' })
534  __p = std::move(__tmp);
535  return __is;
536  }
537 
538  // TODO constrain with _Path<Source> and __value_type_is_char
539  template<typename _Source>
540  inline path
541  u8path(const _Source& __source)
542  {
543 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
544  return path{ path::string_type{__source} };
545 #else
546  return path{ __source };
547 #endif
548  }
549 
550  // TODO constrain with _Path<InputIterator, InputIterator> and __value_type_is_char
551  template<typename _InputIterator>
552  inline path
553  u8path(_InputIterator __first, _InputIterator __last)
554  {
555 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
556  return path{ path::string_type{__first, __last} };
557 #else
558  return path{ __first, __last };
559 #endif
560  }
561 
562  class filesystem_error : public std::system_error
563  {
564  public:
565  filesystem_error(const string& __what_arg, error_code __ec)
566  : system_error(__ec, __what_arg) { }
567 
568  filesystem_error(const string& __what_arg, const path& __p1,
569  error_code __ec)
570  : system_error(__ec, __what_arg), _M_path1(__p1) { }
571 
572  filesystem_error(const string& __what_arg, const path& __p1,
573  const path& __p2, error_code __ec)
574  : system_error(__ec, __what_arg), _M_path1(__p1), _M_path2(__p2)
575  { }
576 
577  ~filesystem_error();
578 
579  const path& path1() const noexcept { return _M_path1; }
580  const path& path2() const noexcept { return _M_path2; }
581  const char* what() const noexcept { return _M_what.c_str(); }
582 
583  private:
584  std::string _M_gen_what();
585 
586  path _M_path1;
587  path _M_path2;
588  std::string _M_what = _M_gen_what();
589  };
590 
591  template<>
592  struct path::__is_encoded_char<char> : std::true_type
593  { using value_type = char; };
594 
595  template<>
596  struct path::__is_encoded_char<wchar_t> : std::true_type
597  { using value_type = wchar_t; };
598 
599  template<>
600  struct path::__is_encoded_char<char16_t> : std::true_type
601  { using value_type = char16_t; };
602 
603  template<>
604  struct path::__is_encoded_char<char32_t> : std::true_type
605  { using value_type = char32_t; };
606 
607  template<typename _Tp>
608  struct path::__is_encoded_char<const _Tp> : __is_encoded_char<_Tp> { };
609 
610  struct path::_Cmpt : path
611  {
612  _Cmpt(string_type __s, _Type __t, size_t __pos)
613  : path(std::move(__s), __t), _M_pos(__pos) { }
614 
615  _Cmpt() : _M_pos(-1) { }
616 
617  size_t _M_pos;
618  };
619 
620  // specialize _Cvt for degenerate 'noconv' case
621  template<>
622  struct path::_Cvt<path::value_type>
623  {
624  template<typename _Iter>
625  static string_type
626  _S_convert(_Iter __first, _Iter __last)
627  { return string_type{__first, __last}; }
628  };
629 
630  template<typename _CharT>
631  struct path::_Cvt
632  {
633 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
634  static string_type
635  _S_wconvert(const char* __f, const char* __l, true_type)
636  {
638  const auto& __cvt = std::use_facet<_Cvt>(std::locale{});
639  std::wstring __wstr;
640  if (__str_codecvt_in(__f, __l, __wstr, __cvt))
641  return __wstr;
642  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
643  "Cannot convert character sequence",
644  std::make_error_code(errc::illegal_byte_sequence)));
645  }
646 
647  static string_type
648  _S_wconvert(const _CharT* __f, const _CharT* __l, false_type)
649  {
650  std::codecvt_utf8<_CharT> __cvt;
651  std::string __str;
652  if (__str_codecvt_out(__f, __l, __str, __cvt))
653  {
654  const char* __f2 = __str.data();
655  const char* __l2 = __f2 + __str.size();
656  std::codecvt_utf8<wchar_t> __wcvt;
657  std::wstring __wstr;
658  if (__str_codecvt_in(__f2, __l2, __wstr, __wcvt))
659  return __wstr;
660  }
661  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
662  "Cannot convert character sequence",
663  std::make_error_code(errc::illegal_byte_sequence)));
664  }
665 
666  static string_type
667  _S_convert(const _CharT* __f, const _CharT* __l)
668  {
669  return _S_wconvert(__f, __l, is_same<_CharT, char>{});
670  }
671 #else
672  static string_type
673  _S_convert(const _CharT* __f, const _CharT* __l)
674  {
675  std::codecvt_utf8<_CharT> __cvt;
676  std::string __str;
677  if (__str_codecvt_out(__f, __l, __str, __cvt))
678  return __str;
679  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
680  "Cannot convert character sequence",
681  std::make_error_code(errc::illegal_byte_sequence)));
682  }
683 #endif
684 
685  static string_type
686  _S_convert(_CharT* __f, _CharT* __l)
687  {
688  return _S_convert(const_cast<const _CharT*>(__f),
689  const_cast<const _CharT*>(__l));
690  }
691 
692  template<typename _Iter>
693  static string_type
694  _S_convert(_Iter __first, _Iter __last)
695  {
696  const std::basic_string<_CharT> __str(__first, __last);
697  return _S_convert(__str.data(), __str.data() + __str.size());
698  }
699 
700  template<typename _Iter, typename _Cont>
701  static string_type
702  _S_convert(__gnu_cxx::__normal_iterator<_Iter, _Cont> __first,
703  __gnu_cxx::__normal_iterator<_Iter, _Cont> __last)
704  { return _S_convert(__first.base(), __last.base()); }
705  };
706 
707  /// An iterator for the components of a path
709  {
710  public:
711  using difference_type = std::ptrdiff_t;
712  using value_type = path;
713  using reference = const path&;
714  using pointer = const path*;
716 
717  iterator() : _M_path(nullptr), _M_cur(), _M_at_end() { }
718 
719  iterator(const iterator&) = default;
720  iterator& operator=(const iterator&) = default;
721 
722  reference operator*() const;
723  pointer operator->() const { return std::__addressof(**this); }
724 
725  iterator& operator++();
726  iterator operator++(int) { auto __tmp = *this; ++_M_cur; return __tmp; }
727 
728  iterator& operator--();
729  iterator operator--(int) { auto __tmp = *this; --_M_cur; return __tmp; }
730 
731  friend bool operator==(const iterator& __lhs, const iterator& __rhs)
732  { return __lhs._M_equals(__rhs); }
733 
734  friend bool operator!=(const iterator& __lhs, const iterator& __rhs)
735  { return !__lhs._M_equals(__rhs); }
736 
737  private:
738  friend class path;
739 
740  iterator(const path* __path, path::_List::const_iterator __iter)
741  : _M_path(__path), _M_cur(__iter), _M_at_end()
742  { }
743 
744  iterator(const path* __path, bool __at_end)
745  : _M_path(__path), _M_cur(), _M_at_end(__at_end)
746  { }
747 
748  bool _M_equals(iterator) const;
749 
750  const path* _M_path;
751  path::_List::const_iterator _M_cur;
752  bool _M_at_end; // only used when type != _Multi
753  };
754 
755 
756  inline path&
757  path::operator=(path&& __p) noexcept
758  {
759  _M_pathname = std::move(__p._M_pathname);
760  _M_cmpts = std::move(__p._M_cmpts);
761  _M_type = __p._M_type;
762  __p.clear();
763  return *this;
764  }
765 
766  inline path&
767  path::operator=(string_type&& __source)
768  { return *this = path(std::move(__source)); }
769 
770  inline path&
771  path::assign(string_type&& __source)
772  { return *this = path(std::move(__source)); }
773 
774  inline path&
775  path::operator+=(const path& __p)
776  {
777  return operator+=(__p.native());
778  }
779 
780  inline path&
781  path::operator+=(const string_type& __x)
782  {
783  _M_pathname += __x;
784  _M_split_cmpts();
785  return *this;
786  }
787 
788  inline path&
789  path::operator+=(const value_type* __x)
790  {
791  _M_pathname += __x;
792  _M_split_cmpts();
793  return *this;
794  }
795 
796  inline path&
797  path::operator+=(value_type __x)
798  {
799  _M_pathname += __x;
800  _M_split_cmpts();
801  return *this;
802  }
803 
804 #if __cplusplus >= 201402L
805  inline path&
806  path::operator+=(basic_string_view<value_type> __x)
807  {
808  _M_pathname.append(__x.data(), __x.size());
809  _M_split_cmpts();
810  return *this;
811  }
812 #endif
813 
814  template<typename _CharT>
815  inline path::_Path<_CharT*, _CharT*>&
816  path::operator+=(_CharT __x)
817  {
818  auto* __addr = std::__addressof(__x);
819  return concat(__addr, __addr + 1);
820  }
821 
822  inline path&
823  path::make_preferred()
824  {
825 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
826  std::replace(_M_pathname.begin(), _M_pathname.end(), L'/',
827  preferred_separator);
828 #endif
829  return *this;
830  }
831 
832  inline void path::swap(path& __rhs) noexcept
833  {
834  _M_pathname.swap(__rhs._M_pathname);
835  _M_cmpts.swap(__rhs._M_cmpts);
836  std::swap(_M_type, __rhs._M_type);
837  }
838 
839  template<typename _CharT, typename _Traits, typename _Allocator>
841  path::string(const _Allocator& __a) const
842  {
843  if (is_same<_CharT, value_type>::value)
844  return { _M_pathname.begin(), _M_pathname.end(), __a };
845 
846  const value_type* __first = _M_pathname.data();
847  const value_type* __last = __first + _M_pathname.size();
848 
849 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
850  using _CharAlloc = __alloc_rebind<_Allocator, char>;
851  using _String = basic_string<char, char_traits<char>, _CharAlloc>;
853 
854  // use codecvt_utf8<wchar_t> to convert native string to UTF-8
855  codecvt_utf8<value_type> __cvt;
856  _String __u8str{_CharAlloc{__a}};
857  if (__str_codecvt_out(__first, __last, __u8str, __cvt))
858  {
859  struct
860  {
861  const _String*
862  operator()(const _String& __from, _String&, true_type)
863  { return std::__addressof(__from); }
864 
865  _WString*
866  operator()(const _String& __from, _WString& __to, false_type)
867  {
868  // use codecvt_utf8<_CharT> to convert UTF-8 to wide string
869  codecvt_utf8<_CharT> __cvt;
870  const char* __f = __from.data();
871  const char* __l = __f + __from.size();
872  if (__str_codecvt_in(__f, __l, __to, __cvt))
873  return std::__addressof(__to);
874  return nullptr;
875  }
876  } __dispatch;
877  _WString __wstr;
878  if (auto* __p = __dispatch(__u8str, __wstr, is_same<_CharT, char>{}))
879  return *__p;
880  }
881 #else
882  codecvt_utf8<_CharT> __cvt;
884  if (__str_codecvt_in(__first, __last, __wstr, __cvt))
885  return __wstr;
886 #endif
887  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
888  "Cannot convert character sequence",
889  std::make_error_code(errc::illegal_byte_sequence)));
890  }
891 
892  inline std::string
893  path::string() const { return string<char>(); }
894 
895 #if _GLIBCXX_USE_WCHAR_T
896  inline std::wstring
897  path::wstring() const { return string<wchar_t>(); }
898 #endif
899 
900  inline std::string
901  path::u8string() const
902  {
903 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
904  std::string __str;
905  // convert from native encoding to UTF-8
906  codecvt_utf8<value_type> __cvt;
907  const value_type* __first = _M_pathname.data();
908  const value_type* __last = __first + _M_pathname.size();
909  if (__str_codecvt_out(__first, __last, __str, __cvt))
910  return __str;
911  _GLIBCXX_THROW_OR_ABORT(filesystem_error(
912  "Cannot convert character sequence",
913  std::make_error_code(errc::illegal_byte_sequence)));
914 #else
915  return _M_pathname;
916 #endif
917  }
918 
919  inline std::u16string
920  path::u16string() const { return string<char16_t>(); }
921 
922  inline std::u32string
923  path::u32string() const { return string<char32_t>(); }
924 
925 #ifndef _GLIBCXX_FILESYSTEM_IS_WINDOWS
926  template<typename _CharT, typename _Traits, typename _Allocator>
928  path::generic_string(const _Allocator& __a) const
929  { return string<_CharT, _Traits, _Allocator>(__a); }
930 
931  inline std::string
932  path::generic_string() const { return string(); }
933 
934 #if _GLIBCXX_USE_WCHAR_T
935  inline std::wstring
936  path::generic_wstring() const { return wstring(); }
937 #endif
938 
939  inline std::string
940  path::generic_u8string() const { return u8string(); }
941 
942  inline std::u16string
943  path::generic_u16string() const { return u16string(); }
944 
945  inline std::u32string
946  path::generic_u32string() const { return u32string(); }
947 #endif
948 
949  inline int
950  path::compare(const string_type& __s) const { return compare(path(__s)); }
951 
952  inline int
953  path::compare(const value_type* __s) const { return compare(path(__s)); }
954 
955 #if __cplusplus >= 201402L
956  inline int
957  path::compare(basic_string_view<value_type> __s) const
958  { return compare(path(__s)); }
959 #endif
960 
961  inline path
962  path::filename() const { return empty() ? path() : *--end(); }
963 
964  inline path
965  path::stem() const
966  {
967  auto ext = _M_find_extension();
968  if (ext.first && ext.second != 0)
969  return path{ext.first->substr(0, ext.second)};
970  return {};
971  }
972 
973  inline path
974  path::extension() const
975  {
976  auto ext = _M_find_extension();
977  if (ext.first && ext.second != string_type::npos)
978  return path{ext.first->substr(ext.second)};
979  return {};
980  }
981 
982  inline bool
983  path::has_stem() const
984  {
985  auto ext = _M_find_extension();
986  return ext.first && ext.second != 0;
987  }
988 
989  inline bool
990  path::has_extension() const
991  {
992  auto ext = _M_find_extension();
993  return ext.first && ext.second != string_type::npos;
994  }
995 
996  inline bool
997  path::is_absolute() const
998  {
999 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1000  return has_root_name();
1001 #else
1002  return has_root_directory();
1003 #endif
1004  }
1005 
1006  inline path::iterator
1007  path::begin() const
1008  {
1009  if (_M_type == _Type::_Multi)
1010  return iterator(this, _M_cmpts.begin());
1011  return iterator(this, false);
1012  }
1013 
1014  inline path::iterator
1015  path::end() const
1016  {
1017  if (_M_type == _Type::_Multi)
1018  return iterator(this, _M_cmpts.end());
1019  return iterator(this, true);
1020  }
1021 
1022  inline path::iterator&
1023  path::iterator::operator++()
1024  {
1025  __glibcxx_assert(_M_path != nullptr);
1026  if (_M_path->_M_type == _Type::_Multi)
1027  {
1028  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end());
1029  ++_M_cur;
1030  }
1031  else
1032  {
1033  __glibcxx_assert(!_M_at_end);
1034  _M_at_end = true;
1035  }
1036  return *this;
1037  }
1038 
1039  inline path::iterator&
1040  path::iterator::operator--()
1041  {
1042  __glibcxx_assert(_M_path != nullptr);
1043  if (_M_path->_M_type == _Type::_Multi)
1044  {
1045  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.begin());
1046  --_M_cur;
1047  }
1048  else
1049  {
1050  __glibcxx_assert(_M_at_end);
1051  _M_at_end = false;
1052  }
1053  return *this;
1054  }
1055 
1057  path::iterator::operator*() const
1058  {
1059  __glibcxx_assert(_M_path != nullptr);
1060  if (_M_path->_M_type == _Type::_Multi)
1061  {
1062  __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end());
1063  return *_M_cur;
1064  }
1065  return *_M_path;
1066  }
1067 
1068  inline bool
1069  path::iterator::_M_equals(iterator __rhs) const
1070  {
1071  if (_M_path != __rhs._M_path)
1072  return false;
1073  if (_M_path == nullptr)
1074  return true;
1075  if (_M_path->_M_type == path::_Type::_Multi)
1076  return _M_cur == __rhs._M_cur;
1077  return _M_at_end == __rhs._M_at_end;
1078  }
1079 
1080  // @} group filesystem
1081 _GLIBCXX_END_NAMESPACE_CXX11
1082 _GLIBCXX_END_NAMESPACE_VERSION
1083 } // namespace v1
1084 } // namespace filesystem
1085 } // namespace experimental
1086 } // namespace std
1087 
1088 #endif // C++11
1089 
1090 #endif // _GLIBCXX_EXPERIMENTAL_FS_PATH_H
const _CharT * data() const noexcept
Return const pointer to contents.
Container class for localization functionality.The locale class is first a class wrapper for C librar...
path u8path(const _Source &__source)
Compare paths.
Definition: fs_path.h:541
const _CharT * c_str() const noexcept
Return const pointer to null-terminated contents.
size_t hash_value(const path &__p) noexcept
Compare paths.
constexpr const _Tp * end(initializer_list< _Tp > __ils) noexcept
Return an iterator pointing to one past the last element of the initializer_list. ...
Managing sequences of characters and character-like objects.
constexpr _Tp * __addressof(_Tp &__r) noexcept
Same as C++11 std::addressof.
Definition: move.h:47
complex< _Tp > operator/(const complex< _Tp > &__x, const complex< _Tp > &__y)
Return new complex value x divided by y.
Definition: complex:416
constexpr const _Tp * begin(initializer_list< _Tp > __ils) noexcept
Return an iterator pointing to the first element of the initializer_list.
ISO C++ entities toplevel namespace is std.
basic_string< char16_t > u16string
A string of char16_t.
Definition: stringfwd.h:84
basic_string< wchar_t > wstring
A string of wchar_t.
Definition: stringfwd.h:78
Template class basic_ostream.
Definition: iosfwd:86
complex< _Tp > operator*(const complex< _Tp > &__x, const complex< _Tp > &__y)
Return new complex value x times y.
Definition: complex:386
Bidirectional iterators support a superset of forward iterator operations.
Struct for delimited strings.
Definition: quoted_string.h:49
bool empty() const noexcept
std::basic_istream< _CharT, _Traits > & operator>>(std::basic_istream< _CharT, _Traits > &__is, bitset< _Nb > &__x)
Global I/O operators for bitsets.
Definition: bitset:1462
basic_string< char32_t > u32string
A string of char32_t.
Definition: stringfwd.h:87
Struct holding two objects of arbitrary type.
Definition: stl_pair.h:190
Marking input iterators.
Class codecvt<wchar_t, char, mbstate_t> specialization.
Definition: codecvt.h:401
error_code
Definition: system_error:145
integral_constant
Definition: type_traits:69
static const size_type npos
Value returned by various member functions when they fail.
reference front()
void push_back(_CharT __c)
Append a single character.
size_type size() const noexcept
Returns the number of characters in the string, not including any null-termination.
Thrown to indicate error code of underlying system.
Definition: system_error:340
basic_string< char > string
A string of char.
Definition: stringfwd.h:71
Template class basic_istream.
Definition: iosfwd:83
An iterator for the components of a path.
Definition: fs_path.h:708
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:4347