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
49#endif
50
51#if defined(_WIN32) && !defined(__CYGWIN__)
52# define _GLIBCXX_FILESYSTEM_IS_WINDOWS 1
53# include <algorithm>
54#endif
55
56namespace std _GLIBCXX_VISIBILITY(default)
57{
58namespace experimental
59{
60namespace filesystem
61{
62inline namespace v1
63{
64_GLIBCXX_BEGIN_NAMESPACE_VERSION
65_GLIBCXX_BEGIN_NAMESPACE_CXX11
66
67#if __cplusplus >= 201402L
68 template<typename _CharT, typename _Traits = std::char_traits<_CharT>>
69 using __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,
86 using __is_path_iter_src
88 std::is_base_of<std::input_iterator_tag,
89 typename _Iter_traits::iterator_category>>;
90
91 template<typename _Iter>
93 __is_path_src(_Iter, int);
94
95 template<typename _CharT, typename _Traits, typename _Alloc>
97 __is_path_src(const basic_string<_CharT, _Traits, _Alloc>&, int);
98
99#if __cplusplus >= 201402L
100 template<typename _CharT, typename _Traits>
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
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*
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*
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
174 typedef std::basic_string<value_type> string_type;
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,
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>,
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,
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>
232 operator=(_Source const& __source)
233 { return *this = path(__source); }
234
235 template<typename _Source>
237 assign(_Source const& __source)
238 { return *this = path(__source); }
239
240 template<typename _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>
251 operator/=(_Source const& __source)
252 { return append(__source); }
253
254 template<typename _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>
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>
279 operator+=(_Source const& __x) { return concat(__x); }
280
281 template<typename _CharT>
283 operator+=(_CharT __x);
284
285 template<typename _Source>
287 concat(_Source const& __x)
288 { return *this += _S_convert(_S_range_begin(__x), _S_range_end(__x)); }
289
290 template<typename _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;
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;
422 _S_convert(__first, __last);
423 }
424
425 template<typename _InputIterator>
426 static string_type
427 _S_convert(_InputIterator __src, __null_terminated)
428 {
429 using _Tp = typename std::iterator_traits<_InputIterator>::value_type;
431 for (; *__src != _Tp{}; ++__src)
432 __tmp.push_back(*__src);
433 return _S_convert(__tmp.c_str(), __tmp.c_str() + __tmp.size());
434 }
435
436 static string_type
437 _S_convert_loc(const char* __first, const char* __last,
438 const std::locale& __loc);
439
440 template<typename _Iter>
441 static string_type
442 _S_convert_loc(_Iter __first, _Iter __last, const std::locale& __loc)
443 {
444 const std::string __str(__first, __last);
445 return _S_convert_loc(__str.data(), __str.data()+__str.size(), __loc);
446 }
447
448 template<typename _InputIterator>
449 static string_type
450 _S_convert_loc(_InputIterator __src, __null_terminated,
451 const std::locale& __loc)
452 {
454 while (*__src != '\0')
455 __tmp.push_back(*__src++);
456 return _S_convert_loc(__tmp.data(), __tmp.data()+__tmp.size(), __loc);
457 }
458
459 bool _S_is_dir_sep(value_type __ch)
460 {
461#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
462 return __ch == L'/' || __ch == preferred_separator;
463#else
464 return __ch == '/';
465#endif
466 }
467
468 void _M_split_cmpts();
469 void _M_trim();
470 void _M_add_root_name(size_t __n);
471 void _M_add_root_dir(size_t __pos);
472 void _M_add_filename(size_t __pos, size_t __n);
473
474 string_type _M_pathname;
475
476 struct _Cmpt;
477 using _List = _GLIBCXX_STD_C::vector<_Cmpt>;
478 _List _M_cmpts; // empty unless _M_type == _Type::_Multi
479 _Type _M_type = _Type::_Multi;
480 };
481
482 inline void swap(path& __lhs, path& __rhs) noexcept { __lhs.swap(__rhs); }
483
484 size_t hash_value(const path& __p) noexcept;
485
486 /// Compare paths
487 inline bool operator<(const path& __lhs, const path& __rhs) noexcept
488 { return __lhs.compare(__rhs) < 0; }
489
490 /// Compare paths
491 inline bool operator<=(const path& __lhs, const path& __rhs) noexcept
492 { return !(__rhs < __lhs); }
493
494 /// Compare paths
495 inline bool operator>(const path& __lhs, const path& __rhs) noexcept
496 { return __rhs < __lhs; }
497
498 /// Compare paths
499 inline bool operator>=(const path& __lhs, const path& __rhs) noexcept
500 { return !(__lhs < __rhs); }
501
502 /// Compare paths
503 inline bool operator==(const path& __lhs, const path& __rhs) noexcept
504 { return __lhs.compare(__rhs) == 0; }
505
506 /// Compare paths
507 inline bool operator!=(const path& __lhs, const path& __rhs) noexcept
508 { return !(__lhs == __rhs); }
509
510 /// Append one path to another
511 inline path operator/(const path& __lhs, const path& __rhs)
512 { return path(__lhs) /= __rhs; }
513
514 /// Write a path to a stream
515 template<typename _CharT, typename _Traits>
518 {
519 auto __tmp = __p.string<_CharT, _Traits>();
520 using __quoted_string
521 = std::__detail::_Quoted_string<decltype(__tmp)&, _CharT>;
522 __os << __quoted_string{__tmp, '"', '\\'};
523 return __os;
524 }
525
526 /// Read a path from a stream
527 template<typename _CharT, typename _Traits>
530 {
532 using __quoted_string
533 = std::__detail::_Quoted_string<decltype(__tmp)&, _CharT>;
534 if (__is >> __quoted_string{ __tmp, '"', '\\' })
535 __p = std::move(__tmp);
536 return __is;
537 }
538
539 // TODO constrain with _Path<Source> and __value_type_is_char
540 template<typename _Source>
541 inline path
543 {
544#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
546#else
547 return path{ __source };
548#endif
549 }
550
551 // TODO constrain with _Path<InputIterator, InputIterator> and __value_type_is_char
552 template<typename _InputIterator>
553 inline path
555 {
556#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
557 return path{ path::string_type{__first, __last} };
558#else
559 return path{ __first, __last };
560#endif
561 }
562
563 class filesystem_error : public std::system_error
564 {
565 public:
566 filesystem_error(const string& __what_arg, error_code __ec)
568
569 filesystem_error(const string& __what_arg, const path& __p1,
571 : system_error(__ec, __what_arg), _M_path1(__p1) { }
572
573 filesystem_error(const string& __what_arg, const path& __p1,
574 const path& __p2, error_code __ec)
575 : system_error(__ec, __what_arg), _M_path1(__p1), _M_path2(__p2)
576 { }
577
578 ~filesystem_error();
579
580 const path& path1() const noexcept { return _M_path1; }
581 const path& path2() const noexcept { return _M_path2; }
582 const char* what() const noexcept { return _M_what.c_str(); }
583
584 private:
585 std::string _M_gen_what();
586
587 path _M_path1;
588 path _M_path2;
589 std::string _M_what = _M_gen_what();
590 };
591
592 template<>
593 struct path::__is_encoded_char<char> : std::true_type
594 { using value_type = char; };
595
596 template<>
597 struct path::__is_encoded_char<wchar_t> : std::true_type
598 { using value_type = wchar_t; };
599
600 template<>
601 struct path::__is_encoded_char<char16_t> : std::true_type
602 { using value_type = char16_t; };
603
604 template<>
605 struct path::__is_encoded_char<char32_t> : std::true_type
606 { using value_type = char32_t; };
607
608 template<typename _Tp>
609 struct path::__is_encoded_char<const _Tp> : __is_encoded_char<_Tp> { };
610
611 struct path::_Cmpt : path
612 {
613 _Cmpt(string_type __s, _Type __t, size_t __pos)
614 : path(std::move(__s), __t), _M_pos(__pos) { }
615
616 _Cmpt() : _M_pos(-1) { }
617
618 size_t _M_pos;
619 };
620
621 // specialize _Cvt for degenerate 'noconv' case
622 template<>
623 struct path::_Cvt<path::value_type>
624 {
625 template<typename _Iter>
626 static string_type
627 _S_convert(_Iter __first, _Iter __last)
628 { return string_type{__first, __last}; }
629 };
630
631 template<typename _CharT>
632 struct path::_Cvt
633 {
634#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
635 static string_type
636 _S_wconvert(const char* __f, const char* __l, true_type)
637 {
639 const auto& __cvt = std::use_facet<_Cvt>(std::locale{});
640 std::wstring __wstr;
641 if (__str_codecvt_in(__f, __l, __wstr, __cvt))
642 return __wstr;
643 _GLIBCXX_THROW_OR_ABORT(filesystem_error(
644 "Cannot convert character sequence",
645 std::make_error_code(errc::illegal_byte_sequence)));
646 }
647
648 static string_type
649 _S_wconvert(const _CharT* __f, const _CharT* __l, false_type)
650 {
652 std::string __str;
653 if (__str_codecvt_out(__f, __l, __str, __cvt))
654 {
655 const char* __f2 = __str.data();
656 const char* __l2 = __f2 + __str.size();
658 std::wstring __wstr;
659 if (__str_codecvt_in(__f2, __l2, __wstr, __wcvt))
660 return __wstr;
661 }
662 _GLIBCXX_THROW_OR_ABORT(filesystem_error(
663 "Cannot convert character sequence",
664 std::make_error_code(errc::illegal_byte_sequence)));
665 }
666
667 static string_type
668 _S_convert(const _CharT* __f, const _CharT* __l)
669 {
670 return _S_wconvert(__f, __l, is_same<_CharT, char>{});
671 }
672#else
673 static string_type
674 _S_convert(const _CharT* __f, const _CharT* __l)
675 {
677 std::string __str;
678 if (__str_codecvt_out(__f, __l, __str, __cvt))
679 return __str;
680 _GLIBCXX_THROW_OR_ABORT(filesystem_error(
681 "Cannot convert character sequence",
682 std::make_error_code(errc::illegal_byte_sequence)));
683 }
684#endif
685
686 static string_type
687 _S_convert(_CharT* __f, _CharT* __l)
688 {
689 return _S_convert(const_cast<const _CharT*>(__f),
690 const_cast<const _CharT*>(__l));
691 }
692
693 template<typename _Iter>
694 static string_type
695 _S_convert(_Iter __first, _Iter __last)
696 {
697 const std::basic_string<_CharT> __str(__first, __last);
698 return _S_convert(__str.data(), __str.data() + __str.size());
699 }
700
701 template<typename _Iter, typename _Cont>
702 static string_type
703 _S_convert(__gnu_cxx::__normal_iterator<_Iter, _Cont> __first,
704 __gnu_cxx::__normal_iterator<_Iter, _Cont> __last)
705 { return _S_convert(__first.base(), __last.base()); }
706 };
707
708 /// An iterator for the components of a path
710 {
711 public:
713 using value_type = path;
714 using reference = const path&;
715 using pointer = const path*;
717
718 iterator() : _M_path(nullptr), _M_cur(), _M_at_end() { }
719
720 iterator(const iterator&) = default;
721 iterator& operator=(const iterator&) = default;
722
723 reference operator*() const;
724 pointer operator->() const { return std::__addressof(**this); }
725
726 iterator& operator++();
727 iterator operator++(int) { auto __tmp = *this; ++*this; return __tmp; }
728
729 iterator& operator--();
730 iterator operator--(int) { auto __tmp = *this; --*this; return __tmp; }
731
732 friend bool operator==(const iterator& __lhs, const iterator& __rhs)
733 { return __lhs._M_equals(__rhs); }
734
735 friend bool operator!=(const iterator& __lhs, const iterator& __rhs)
736 { return !__lhs._M_equals(__rhs); }
737
738 private:
739 friend class path;
740
741 iterator(const path* __path, path::_List::const_iterator __iter)
742 : _M_path(__path), _M_cur(__iter), _M_at_end()
743 { }
744
745 iterator(const path* __path, bool __at_end)
746 : _M_path(__path), _M_cur(), _M_at_end(__at_end)
747 { }
748
749 bool _M_equals(iterator) const;
750
751 const path* _M_path;
752 path::_List::const_iterator _M_cur;
753 bool _M_at_end; // only used when type != _Multi
754 };
755
756
757 inline path&
758 path::operator=(path&& __p) noexcept
759 {
760 _M_pathname = std::move(__p._M_pathname);
761 _M_cmpts = std::move(__p._M_cmpts);
762 _M_type = __p._M_type;
763 __p.clear();
764 return *this;
765 }
766
767 inline path&
768 path::operator=(string_type&& __source)
769 { return *this = path(std::move(__source)); }
770
771 inline path&
772 path::assign(string_type&& __source)
773 { return *this = path(std::move(__source)); }
774
775 inline path&
776 path::operator+=(const path& __p)
777 {
778 return operator+=(__p.native());
779 }
780
781 inline path&
782 path::operator+=(const string_type& __x)
783 {
784 _M_pathname += __x;
785 _M_split_cmpts();
786 return *this;
787 }
788
789 inline path&
790 path::operator+=(const value_type* __x)
791 {
792 _M_pathname += __x;
793 _M_split_cmpts();
794 return *this;
795 }
796
797 inline path&
798 path::operator+=(value_type __x)
799 {
800 _M_pathname += __x;
801 _M_split_cmpts();
802 return *this;
803 }
804
805#if __cplusplus >= 201402L
806 inline path&
807 path::operator+=(__basic_string_view<value_type> __x)
808 {
809 _M_pathname.append(__x.data(), __x.size());
810 _M_split_cmpts();
811 return *this;
812 }
813#endif
814
815 template<typename _CharT>
816 inline path::_Path<_CharT*, _CharT*>&
817 path::operator+=(_CharT __x)
818 {
819 auto* __addr = std::__addressof(__x);
820 return concat(__addr, __addr + 1);
821 }
822
823 inline path&
824 path::make_preferred()
825 {
826#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
827 std::replace(_M_pathname.begin(), _M_pathname.end(), L'/',
828 preferred_separator);
829#endif
830 return *this;
831 }
832
833 inline void path::swap(path& __rhs) noexcept
834 {
835 _M_pathname.swap(__rhs._M_pathname);
836 _M_cmpts.swap(__rhs._M_cmpts);
837 std::swap(_M_type, __rhs._M_type);
838 }
839
840 template<typename _CharT, typename _Traits, typename _Allocator>
842 path::string(const _Allocator& __a) const
843 {
844 if (is_same<_CharT, value_type>::value)
845 return { _M_pathname.begin(), _M_pathname.end(), __a };
846
847 const value_type* __first = _M_pathname.data();
848 const value_type* __last = __first + _M_pathname.size();
849
850#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
851 using _CharAlloc = __alloc_rebind<_Allocator, char>;
852 using _String = basic_string<char, char_traits<char>, _CharAlloc>;
853 using _WString = basic_string<_CharT, _Traits, _Allocator>;
854
855 // use codecvt_utf8<wchar_t> to convert native string to UTF-8
856 codecvt_utf8<value_type> __cvt;
857 _String __u8str{_CharAlloc{__a}};
858 if (__str_codecvt_out(__first, __last, __u8str, __cvt))
859 {
860 struct
861 {
862 const _String*
863 operator()(const _String& __from, _String&, true_type)
864 { return std::__addressof(__from); }
865
866 _WString*
867 operator()(const _String& __from, _WString& __to, false_type)
868 {
869 // use codecvt_utf8<_CharT> to convert UTF-8 to wide string
870 codecvt_utf8<_CharT> __cvt;
871 const char* __f = __from.data();
872 const char* __l = __f + __from.size();
873 if (__str_codecvt_in(__f, __l, __to, __cvt))
874 return std::__addressof(__to);
875 return nullptr;
876 }
877 } __dispatch;
878 _WString __wstr;
879 if (auto* __p = __dispatch(__u8str, __wstr, is_same<_CharT, char>{}))
880 return *__p;
881 }
882#else
883 codecvt_utf8<_CharT> __cvt;
884 basic_string<_CharT, _Traits, _Allocator> __wstr{__a};
885 if (__str_codecvt_in(__first, __last, __wstr, __cvt))
886 return __wstr;
887#endif
888 _GLIBCXX_THROW_OR_ABORT(filesystem_error(
889 "Cannot convert character sequence",
890 std::make_error_code(errc::illegal_byte_sequence)));
891 }
892
893 inline std::string
894 path::string() const { return string<char>(); }
895
896#if _GLIBCXX_USE_WCHAR_T
897 inline std::wstring
898 path::wstring() const { return string<wchar_t>(); }
899#endif
900
901 inline std::string
902 path::u8string() const
903 {
904#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
905 std::string __str;
906 // convert from native encoding to UTF-8
907 codecvt_utf8<value_type> __cvt;
908 const value_type* __first = _M_pathname.data();
909 const value_type* __last = __first + _M_pathname.size();
910 if (__str_codecvt_out(__first, __last, __str, __cvt))
911 return __str;
912 _GLIBCXX_THROW_OR_ABORT(filesystem_error(
913 "Cannot convert character sequence",
914 std::make_error_code(errc::illegal_byte_sequence)));
915#else
916 return _M_pathname;
917#endif
918 }
919
920 inline std::u16string
921 path::u16string() const { return string<char16_t>(); }
922
923 inline std::u32string
924 path::u32string() const { return string<char32_t>(); }
925
926#ifndef _GLIBCXX_FILESYSTEM_IS_WINDOWS
927 template<typename _CharT, typename _Traits, typename _Allocator>
929 path::generic_string(const _Allocator& __a) const
930 { return string<_CharT, _Traits, _Allocator>(__a); }
931
932 inline std::string
933 path::generic_string() const { return string(); }
934
935#if _GLIBCXX_USE_WCHAR_T
936 inline std::wstring
937 path::generic_wstring() const { return wstring(); }
938#endif
939
940 inline std::string
941 path::generic_u8string() const { return u8string(); }
942
943 inline std::u16string
944 path::generic_u16string() const { return u16string(); }
945
946 inline std::u32string
947 path::generic_u32string() const { return u32string(); }
948#endif
949
950 inline int
951 path::compare(const string_type& __s) const { return compare(path(__s)); }
952
953 inline int
954 path::compare(const value_type* __s) const { return compare(path(__s)); }
955
956#if __cplusplus >= 201402L
957 inline int
958 path::compare(__basic_string_view<value_type> __s) const
959 { return compare(path(__s)); }
960#endif
961
962 inline path
963 path::filename() const { return empty() ? path() : *--end(); }
964
965 inline path
966 path::stem() const
967 {
968 auto ext = _M_find_extension();
969 if (ext.first && ext.second != 0)
970 return path{ext.first->substr(0, ext.second)};
971 return {};
972 }
973
974 inline path
975 path::extension() const
976 {
977 auto ext = _M_find_extension();
978 if (ext.first && ext.second != string_type::npos)
979 return path{ext.first->substr(ext.second)};
980 return {};
981 }
982
983 inline bool
984 path::has_stem() const
985 {
986 auto ext = _M_find_extension();
987 return ext.first && ext.second != 0;
988 }
989
990 inline bool
991 path::has_extension() const
992 {
993 auto ext = _M_find_extension();
994 return ext.first && ext.second != string_type::npos;
995 }
996
997 inline bool
998 path::is_absolute() const
999 {
1000#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
1001 return has_root_name();
1002#else
1003 return has_root_directory();
1004#endif
1005 }
1006
1007 inline path::iterator
1008 path::begin() const
1009 {
1010 if (_M_type == _Type::_Multi)
1011 return iterator(this, _M_cmpts.begin());
1012 return iterator(this, false);
1013 }
1014
1015 inline path::iterator
1016 path::end() const
1017 {
1018 if (_M_type == _Type::_Multi)
1019 return iterator(this, _M_cmpts.end());
1020 return iterator(this, true);
1021 }
1022
1023 inline path::iterator&
1024 path::iterator::operator++()
1025 {
1026 __glibcxx_assert(_M_path != nullptr);
1027 if (_M_path->_M_type == _Type::_Multi)
1028 {
1029 __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end());
1030 ++_M_cur;
1031 }
1032 else
1033 {
1034 __glibcxx_assert(!_M_at_end);
1035 _M_at_end = true;
1036 }
1037 return *this;
1038 }
1039
1040 inline path::iterator&
1041 path::iterator::operator--()
1042 {
1043 __glibcxx_assert(_M_path != nullptr);
1044 if (_M_path->_M_type == _Type::_Multi)
1045 {
1046 __glibcxx_assert(_M_cur != _M_path->_M_cmpts.begin());
1047 --_M_cur;
1048 }
1049 else
1050 {
1051 __glibcxx_assert(_M_at_end);
1052 _M_at_end = false;
1053 }
1054 return *this;
1055 }
1056
1057 inline path::iterator::reference
1058 path::iterator::operator*() const
1059 {
1060 __glibcxx_assert(_M_path != nullptr);
1061 if (_M_path->_M_type == _Type::_Multi)
1062 {
1063 __glibcxx_assert(_M_cur != _M_path->_M_cmpts.end());
1064 return *_M_cur;
1065 }
1066 return *_M_path;
1067 }
1068
1069 inline bool
1070 path::iterator::_M_equals(iterator __rhs) const
1071 {
1072 if (_M_path != __rhs._M_path)
1073 return false;
1074 if (_M_path == nullptr)
1075 return true;
1076 if (_M_path->_M_type == path::_Type::_Multi)
1077 return _M_cur == __rhs._M_cur;
1078 return _M_at_end == __rhs._M_at_end;
1079 }
1080
1081 // @} group filesystem
1082_GLIBCXX_END_NAMESPACE_CXX11
1083_GLIBCXX_END_NAMESPACE_VERSION
1084} // namespace v1
1085} // namespace filesystem
1086} // namespace experimental
1087} // namespace std
1088
1089#endif // C++11
1090
1091#endif // _GLIBCXX_EXPERIMENTAL_FS_PATH_H
size_t hash_value(const path &__p) noexcept
Compare paths.
path u8path(const _Source &__source)
Compare paths.
Definition fs_path.h:542
integral_constant< bool, true > true_type
The type used as a compile-time boolean with true value.
Definition type_traits:87
integral_constant< bool, false > false_type
The type used as a compile-time boolean with false value.
Definition type_traits:90
_Tp * __addressof(_Tp &__r) noexcept
Same as C++11 std::addressof.
Definition move.h:47
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:1462
error_code
Definition system_error:139
Thrown to indicate error code of underlying system.
Definition system_error:334
integral_constant
Definition type_traits:70
const _CharT * data() const noexcept
Return const pointer to contents.
size_type size() const noexcept
Returns the number of characters in the string, not including any null-termination.
basic_string & append(const basic_string &__str)
Append a string to this string.
bool empty() const noexcept
const _CharT * c_str() const noexcept
Return const pointer to null-terminated contents.
static const size_type npos
Value returned by various member functions when they fail.
Container class for localization functionality.
Struct for delimited strings.
Marking input iterators.
Bidirectional iterators support a superset of forward iterator operations.
Common iterator class.
iterator begin() noexcept
Definition stl_vector.h:548
iterator end() noexcept
Definition stl_vector.h:566
An iterator for the components of a path.
Definition fs_path.h:710
A non-owning reference to a string.
Definition string_view:77