libstdc++
regex.h
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1 // class template regex -*- C++ -*-
2 
3 // Copyright (C) 2010-2021 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
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10 
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15 
16 // Under Section 7 of GPL version 3, you are granted additional
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18 // 3.1, as published by the Free Software Foundation.
19 
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24 
25 /**
26  * @file bits/regex.h
27  * This is an internal header file, included by other library headers.
28  * Do not attempt to use it directly. @headername{regex}
29  */
30 
31 namespace std _GLIBCXX_VISIBILITY(default)
32 {
33 _GLIBCXX_BEGIN_NAMESPACE_VERSION
34 _GLIBCXX_BEGIN_NAMESPACE_CXX11
35  template<typename, typename>
36  class basic_regex;
37 
38  template<typename _Bi_iter, typename _Alloc>
39  class match_results;
40 
41 _GLIBCXX_END_NAMESPACE_CXX11
42 
43 namespace __detail
44 {
45  enum class _RegexExecutorPolicy : int { _S_auto, _S_alternate };
46 
47  template<typename _BiIter, typename _Alloc,
48  typename _CharT, typename _TraitsT,
49  _RegexExecutorPolicy __policy,
50  bool __match_mode>
51  bool
52  __regex_algo_impl(_BiIter __s,
53  _BiIter __e,
54  match_results<_BiIter, _Alloc>& __m,
55  const basic_regex<_CharT, _TraitsT>& __re,
57 
58  template<typename, typename, typename, bool>
59  class _Executor;
60 
61  template<typename _Tp>
62  struct __is_contiguous_iter : false_type { };
63 
64  template<typename _Tp>
65  struct __is_contiguous_iter<_Tp*> : true_type { };
66 
67  template<typename _Tp, typename _Cont>
68  struct __is_contiguous_iter<__gnu_cxx::__normal_iterator<_Tp*, _Cont>>
69  : true_type { };
70 }
71 
72 _GLIBCXX_BEGIN_NAMESPACE_CXX11
73 
74  /**
75  * @addtogroup regex
76  * @{
77  */
78 
79  /**
80  * @brief Describes aspects of a regular expression.
81  *
82  * A regular expression traits class that satisfies the requirements of
83  * section [28.7].
84  *
85  * The class %regex is parameterized around a set of related types and
86  * functions used to complete the definition of its semantics. This class
87  * satisfies the requirements of such a traits class.
88  */
89  template<typename _Ch_type>
91  {
92  public:
93  typedef _Ch_type char_type;
95  typedef std::locale locale_type;
96 
97  private:
98  struct _RegexMask
99  {
100  typedef std::ctype_base::mask _BaseType;
101  _BaseType _M_base;
102  unsigned char _M_extended;
103  static constexpr unsigned char _S_under = 1 << 0;
104  static constexpr unsigned char _S_valid_mask = 0x1;
105 
106  constexpr _RegexMask(_BaseType __base = 0,
107  unsigned char __extended = 0)
108  : _M_base(__base), _M_extended(__extended)
109  { }
110 
111  constexpr _RegexMask
112  operator&(_RegexMask __other) const
113  {
114  return _RegexMask(_M_base & __other._M_base,
115  _M_extended & __other._M_extended);
116  }
117 
118  constexpr _RegexMask
119  operator|(_RegexMask __other) const
120  {
121  return _RegexMask(_M_base | __other._M_base,
122  _M_extended | __other._M_extended);
123  }
124 
125  constexpr _RegexMask
126  operator^(_RegexMask __other) const
127  {
128  return _RegexMask(_M_base ^ __other._M_base,
129  _M_extended ^ __other._M_extended);
130  }
131 
132  constexpr _RegexMask
133  operator~() const
134  { return _RegexMask(~_M_base, ~_M_extended); }
135 
136  _RegexMask&
137  operator&=(_RegexMask __other)
138  { return *this = (*this) & __other; }
139 
140  _RegexMask&
141  operator|=(_RegexMask __other)
142  { return *this = (*this) | __other; }
143 
144  _RegexMask&
145  operator^=(_RegexMask __other)
146  { return *this = (*this) ^ __other; }
147 
148  constexpr bool
149  operator==(_RegexMask __other) const
150  {
151  return (_M_extended & _S_valid_mask)
152  == (__other._M_extended & _S_valid_mask)
153  && _M_base == __other._M_base;
154  }
155 
156 #if __cpp_impl_three_way_comparison < 201907L
157  constexpr bool
158  operator!=(_RegexMask __other) const
159  { return !((*this) == __other); }
160 #endif
161  };
162 
163  public:
164  typedef _RegexMask char_class_type;
165 
166  public:
167  /**
168  * @brief Constructs a default traits object.
169  */
171 
172  /**
173  * @brief Gives the length of a C-style string starting at @p __p.
174  *
175  * @param __p a pointer to the start of a character sequence.
176  *
177  * @returns the number of characters between @p *__p and the first
178  * default-initialized value of type @p char_type. In other words, uses
179  * the C-string algorithm for determining the length of a sequence of
180  * characters.
181  */
182  static std::size_t
183  length(const char_type* __p)
184  { return string_type::traits_type::length(__p); }
185 
186  /**
187  * @brief Performs the identity translation.
188  *
189  * @param __c A character to the locale-specific character set.
190  *
191  * @returns __c.
192  */
193  char_type
194  translate(char_type __c) const
195  { return __c; }
196 
197  /**
198  * @brief Translates a character into a case-insensitive equivalent.
199  *
200  * @param __c A character to the locale-specific character set.
201  *
202  * @returns the locale-specific lower-case equivalent of __c.
203  * @throws std::bad_cast if the imbued locale does not support the ctype
204  * facet.
205  */
206  char_type
207  translate_nocase(char_type __c) const
208  {
209  typedef std::ctype<char_type> __ctype_type;
210  const __ctype_type& __fctyp(use_facet<__ctype_type>(_M_locale));
211  return __fctyp.tolower(__c);
212  }
213 
214  /**
215  * @brief Gets a sort key for a character sequence.
216  *
217  * @param __first beginning of the character sequence.
218  * @param __last one-past-the-end of the character sequence.
219  *
220  * Returns a sort key for the character sequence designated by the
221  * iterator range [F1, F2) such that if the character sequence [G1, G2)
222  * sorts before the character sequence [H1, H2) then
223  * v.transform(G1, G2) < v.transform(H1, H2).
224  *
225  * What this really does is provide a more efficient way to compare a
226  * string to multiple other strings in locales with fancy collation
227  * rules and equivalence classes.
228  *
229  * @returns a locale-specific sort key equivalent to the input range.
230  *
231  * @throws std::bad_cast if the current locale does not have a collate
232  * facet.
233  */
234  template<typename _Fwd_iter>
235  string_type
236  transform(_Fwd_iter __first, _Fwd_iter __last) const
237  {
238  typedef std::collate<char_type> __collate_type;
239  const __collate_type& __fclt(use_facet<__collate_type>(_M_locale));
240  string_type __s(__first, __last);
241  return __fclt.transform(__s.data(), __s.data() + __s.size());
242  }
243 
244  /**
245  * @brief Gets a sort key for a character sequence, independent of case.
246  *
247  * @param __first beginning of the character sequence.
248  * @param __last one-past-the-end of the character sequence.
249  *
250  * Effects: if typeid(use_facet<collate<_Ch_type> >) ==
251  * typeid(collate_byname<_Ch_type>) and the form of the sort key
252  * returned by collate_byname<_Ch_type>::transform(__first, __last)
253  * is known and can be converted into a primary sort key
254  * then returns that key, otherwise returns an empty string.
255  *
256  * @todo Implement this function correctly.
257  */
258  template<typename _Fwd_iter>
259  string_type
260  transform_primary(_Fwd_iter __first, _Fwd_iter __last) const
261  {
262  // TODO : this is not entirely correct.
263  // This function requires extra support from the platform.
264  //
265  // Read http://gcc.gnu.org/ml/libstdc++/2013-09/msg00117.html and
266  // http://www.open-std.org/Jtc1/sc22/wg21/docs/papers/2003/n1429.htm
267  // for details.
268  typedef std::ctype<char_type> __ctype_type;
269  const __ctype_type& __fctyp(use_facet<__ctype_type>(_M_locale));
270  std::vector<char_type> __s(__first, __last);
271  __fctyp.tolower(__s.data(), __s.data() + __s.size());
272  return this->transform(__s.data(), __s.data() + __s.size());
273  }
274 
275  /**
276  * @brief Gets a collation element by name.
277  *
278  * @param __first beginning of the collation element name.
279  * @param __last one-past-the-end of the collation element name.
280  *
281  * @returns a sequence of one or more characters that represents the
282  * collating element consisting of the character sequence designated by
283  * the iterator range [__first, __last). Returns an empty string if the
284  * character sequence is not a valid collating element.
285  */
286  template<typename _Fwd_iter>
287  string_type
288  lookup_collatename(_Fwd_iter __first, _Fwd_iter __last) const;
289 
290  /**
291  * @brief Maps one or more characters to a named character
292  * classification.
293  *
294  * @param __first beginning of the character sequence.
295  * @param __last one-past-the-end of the character sequence.
296  * @param __icase ignores the case of the classification name.
297  *
298  * @returns an unspecified value that represents the character
299  * classification named by the character sequence designated by
300  * the iterator range [__first, __last). If @p icase is true,
301  * the returned mask identifies the classification regardless of
302  * the case of the characters to be matched (for example,
303  * [[:lower:]] is the same as [[:alpha:]]), otherwise a
304  * case-dependent classification is returned. The value
305  * returned shall be independent of the case of the characters
306  * in the character sequence. If the name is not recognized then
307  * returns a value that compares equal to 0.
308  *
309  * At least the following names (or their wide-character equivalent) are
310  * supported.
311  * - d
312  * - w
313  * - s
314  * - alnum
315  * - alpha
316  * - blank
317  * - cntrl
318  * - digit
319  * - graph
320  * - lower
321  * - print
322  * - punct
323  * - space
324  * - upper
325  * - xdigit
326  */
327  template<typename _Fwd_iter>
328  char_class_type
329  lookup_classname(_Fwd_iter __first, _Fwd_iter __last,
330  bool __icase = false) const;
331 
332  /**
333  * @brief Determines if @p c is a member of an identified class.
334  *
335  * @param __c a character.
336  * @param __f a class type (as returned from lookup_classname).
337  *
338  * @returns true if the character @p __c is a member of the classification
339  * represented by @p __f, false otherwise.
340  *
341  * @throws std::bad_cast if the current locale does not have a ctype
342  * facet.
343  */
344  bool
345  isctype(_Ch_type __c, char_class_type __f) const;
346 
347  /**
348  * @brief Converts a digit to an int.
349  *
350  * @param __ch a character representing a digit.
351  * @param __radix the radix if the numeric conversion (limited to 8, 10,
352  * or 16).
353  *
354  * @returns the value represented by the digit __ch in base radix if the
355  * character __ch is a valid digit in base radix; otherwise returns -1.
356  */
357  int
358  value(_Ch_type __ch, int __radix) const;
359 
360  /**
361  * @brief Imbues the regex_traits object with a copy of a new locale.
362  *
363  * @param __loc A locale.
364  *
365  * @returns a copy of the previous locale in use by the regex_traits
366  * object.
367  *
368  * @note Calling imbue with a different locale than the one currently in
369  * use invalidates all cached data held by *this.
370  */
373  {
374  std::swap(_M_locale, __loc);
375  return __loc;
376  }
377 
378  /**
379  * @brief Gets a copy of the current locale in use by the regex_traits
380  * object.
381  */
382  locale_type
383  getloc() const
384  { return _M_locale; }
385 
386  protected:
387  locale_type _M_locale;
388  };
389 
390  // [7.8] Class basic_regex
391  /**
392  * Objects of specializations of this class represent regular expressions
393  * constructed from sequences of character type @p _Ch_type.
394  *
395  * Storage for the regular expression is allocated and deallocated as
396  * necessary by the member functions of this class.
397  */
398  template<typename _Ch_type, typename _Rx_traits = regex_traits<_Ch_type>>
400  {
401  public:
403  "regex traits class must have the same char_type");
404 
405  // types:
406  typedef _Ch_type value_type;
407  typedef _Rx_traits traits_type;
408  typedef typename traits_type::string_type string_type;
410  typedef typename traits_type::locale_type locale_type;
411 
412  /**
413  * @name Constants
414  * std [28.8.1](1)
415  */
416  ///@{
417  static constexpr flag_type icase = regex_constants::icase;
418  static constexpr flag_type nosubs = regex_constants::nosubs;
419  static constexpr flag_type optimize = regex_constants::optimize;
420  static constexpr flag_type collate = regex_constants::collate;
421  static constexpr flag_type ECMAScript = regex_constants::ECMAScript;
422  static constexpr flag_type basic = regex_constants::basic;
423  static constexpr flag_type extended = regex_constants::extended;
424  static constexpr flag_type awk = regex_constants::awk;
425  static constexpr flag_type grep = regex_constants::grep;
426  static constexpr flag_type egrep = regex_constants::egrep;
427 #if __cplusplus >= 201703L || !defined __STRICT_ANSI__
428  static constexpr flag_type multiline = regex_constants::multiline;
429 #endif
430  ///@}
431 
432  // [7.8.2] construct/copy/destroy
433  /**
434  * Constructs a basic regular expression that does not match any
435  * character sequence.
436  */
437  basic_regex() noexcept
438  : _M_flags(ECMAScript), _M_loc(), _M_automaton(nullptr)
439  { }
440 
441  /**
442  * @brief Constructs a basic regular expression from the
443  * sequence [__p, __p + char_traits<_Ch_type>::length(__p))
444  * interpreted according to the flags in @p __f.
445  *
446  * @param __p A pointer to the start of a C-style null-terminated string
447  * containing a regular expression.
448  * @param __f Flags indicating the syntax rules and options.
449  *
450  * @throws regex_error if @p __p is not a valid regular expression.
451  */
452  explicit
453  basic_regex(const _Ch_type* __p, flag_type __f = ECMAScript)
454  { _M_compile(__p, __p + _Rx_traits::length(__p), __f); }
455 
456  /**
457  * @brief Constructs a basic regular expression from the sequence
458  * [p, p + len) interpreted according to the flags in @p f.
459  *
460  * @param __p A pointer to the start of a string containing a regular
461  * expression.
462  * @param __len The length of the string containing the regular
463  * expression.
464  * @param __f Flags indicating the syntax rules and options.
465  *
466  * @throws regex_error if @p __p is not a valid regular expression.
467  */
468  basic_regex(const _Ch_type* __p, std::size_t __len,
469  flag_type __f = ECMAScript)
470  { _M_compile(__p, __p + __len, __f); }
471 
472  /**
473  * @brief Copy-constructs a basic regular expression.
474  *
475  * @param __rhs A @p regex object.
476  */
477  basic_regex(const basic_regex& __rhs) = default;
478 
479  /**
480  * @brief Move-constructs a basic regular expression.
481  *
482  * @param __rhs A @p regex object.
483  */
484  basic_regex(basic_regex&& __rhs) noexcept = default;
485 
486  /**
487  * @brief Constructs a basic regular expression from the string
488  * @p s interpreted according to the flags in @p f.
489  *
490  * @param __s A string containing a regular expression.
491  * @param __f Flags indicating the syntax rules and options.
492  *
493  * @throws regex_error if @p __s is not a valid regular expression.
494  */
495  template<typename _Ch_traits, typename _Ch_alloc>
496  explicit
497  basic_regex(const std::basic_string<_Ch_type, _Ch_traits,
498  _Ch_alloc>& __s,
499  flag_type __f = ECMAScript)
500  { _M_compile(__s.data(), __s.data() + __s.size(), __f); }
501 
502  /**
503  * @brief Constructs a basic regular expression from the range
504  * [first, last) interpreted according to the flags in @p f.
505  *
506  * @param __first The start of a range containing a valid regular
507  * expression.
508  * @param __last The end of a range containing a valid regular
509  * expression.
510  * @param __f The format flags of the regular expression.
511  *
512  * @throws regex_error if @p [__first, __last) is not a valid regular
513  * expression.
514  */
515  template<typename _FwdIter>
516  basic_regex(_FwdIter __first, _FwdIter __last,
517  flag_type __f = ECMAScript)
518  { this->assign(__first, __last, __f); }
519 
520  /**
521  * @brief Constructs a basic regular expression from an initializer list.
522  *
523  * @param __l The initializer list.
524  * @param __f The format flags of the regular expression.
525  *
526  * @throws regex_error if @p __l is not a valid regular expression.
527  */
529  { _M_compile(__l.begin(), __l.end(), __f); }
530 
531  /**
532  * @brief Destroys a basic regular expression.
533  */
535  { }
536 
537  /**
538  * @brief Assigns one regular expression to another.
539  */
540  basic_regex&
541  operator=(const basic_regex&) = default;
542 
543  /**
544  * @brief Move-assigns one regular expression to another.
545  */
546  basic_regex&
547  operator=(basic_regex&&) = default;
548 
549  /**
550  * @brief Replaces a regular expression with a new one constructed from
551  * a C-style null-terminated string.
552  *
553  * @param __p A pointer to the start of a null-terminated C-style string
554  * containing a regular expression.
555  */
556  basic_regex&
557  operator=(const _Ch_type* __p)
558  { return this->assign(__p); }
559 
560  /**
561  * @brief Replaces a regular expression with a new one constructed from
562  * an initializer list.
563  *
564  * @param __l The initializer list.
565  *
566  * @throws regex_error if @p __l is not a valid regular expression.
567  */
568  basic_regex&
570  { return this->assign(__l); }
571 
572  /**
573  * @brief Replaces a regular expression with a new one constructed from
574  * a string.
575  *
576  * @param __s A pointer to a string containing a regular expression.
577  */
578  template<typename _Ch_traits, typename _Alloc>
579  basic_regex&
581  { return this->assign(__s); }
582 
583  // [7.8.3] assign
584  /**
585  * @brief Assigns one regular expression to another.
586  *
587  * @param __rhs Another regular expression object.
588  */
589  basic_regex&
590  assign(const basic_regex& __rhs) noexcept
591  { return *this = __rhs; }
592 
593  /**
594  * @brief Move-assigns one regular expression to another.
595  *
596  * @param __rhs Another regular expression object.
597  */
598  basic_regex&
599  assign(basic_regex&& __rhs) noexcept
600  { return *this = std::move(__rhs); }
601 
602  /**
603  * @brief Assigns a new regular expression to a regex object from a
604  * C-style null-terminated string containing a regular expression
605  * pattern.
606  *
607  * @param __p A pointer to a C-style null-terminated string containing
608  * a regular expression pattern.
609  * @param __flags Syntax option flags.
610  *
611  * @throws regex_error if __p does not contain a valid regular
612  * expression pattern interpreted according to @p __flags. If
613  * regex_error is thrown, *this remains unchanged.
614  */
615  basic_regex&
616  assign(const _Ch_type* __p, flag_type __flags = ECMAScript)
617  {
618  _M_compile(__p, __p + _Rx_traits::length(__p), __flags);
619  return *this;
620  }
621 
622  /**
623  * @brief Assigns a new regular expression to a regex object from a
624  * C-style string containing a regular expression pattern.
625  *
626  * @param __p A pointer to a C-style string containing a
627  * regular expression pattern.
628  * @param __len The length of the regular expression pattern string.
629  * @param __flags Syntax option flags.
630  *
631  * @throws regex_error if p does not contain a valid regular
632  * expression pattern interpreted according to @p __flags. If
633  * regex_error is thrown, *this remains unchanged.
634  */
635  // _GLIBCXX_RESOLVE_LIB_DEFECTS
636  // 3296. Inconsistent default argument for basic_regex<>::assign
637  basic_regex&
638  assign(const _Ch_type* __p, size_t __len, flag_type __flags = ECMAScript)
639  {
640  _M_compile(__p, __p + __len, __flags);
641  return *this;
642  }
643 
644  /**
645  * @brief Assigns a new regular expression to a regex object from a
646  * string containing a regular expression pattern.
647  *
648  * @param __s A string containing a regular expression pattern.
649  * @param __flags Syntax option flags.
650  *
651  * @throws regex_error if __s does not contain a valid regular
652  * expression pattern interpreted according to @p __flags. If
653  * regex_error is thrown, *this remains unchanged.
654  */
655  template<typename _Ch_traits, typename _Alloc>
656  basic_regex&
658  flag_type __flags = ECMAScript)
659  {
660  _M_compile(__s.data(), __s.data() + __s.size(), __flags);
661  return *this;
662  }
663 
664  /**
665  * @brief Assigns a new regular expression to a regex object.
666  *
667  * @param __first The start of a range containing a valid regular
668  * expression.
669  * @param __last The end of a range containing a valid regular
670  * expression.
671  * @param __flags Syntax option flags.
672  *
673  * @throws regex_error if p does not contain a valid regular
674  * expression pattern interpreted according to @p __flags. If
675  * regex_error is thrown, the object remains unchanged.
676  */
677  template<typename _InputIterator>
678  basic_regex&
679  assign(_InputIterator __first, _InputIterator __last,
680  flag_type __flags = ECMAScript)
681  {
682 #if __cplusplus >= 201703L
683  using _ValT = typename iterator_traits<_InputIterator>::value_type;
684  if constexpr (__detail::__is_contiguous_iter<_InputIterator>::value
685  && is_same_v<_ValT, value_type>)
686  {
687  const auto __len = __last - __first;
688  const _Ch_type* __p = std::__to_address(__first);
689  _M_compile(__p, __p + __len, __flags);
690  }
691  else
692 #endif
693  this->assign(string_type(__first, __last), __flags);
694  return *this;
695  }
696 
697  /**
698  * @brief Assigns a new regular expression to a regex object.
699  *
700  * @param __l An initializer list representing a regular expression.
701  * @param __flags Syntax option flags.
702  *
703  * @throws regex_error if @p __l does not contain a valid
704  * regular expression pattern interpreted according to @p
705  * __flags. If regex_error is thrown, the object remains
706  * unchanged.
707  */
708  basic_regex&
709  assign(initializer_list<_Ch_type> __l, flag_type __flags = ECMAScript)
710  {
711  _M_compile(__l.begin(), __l.end(), __flags);
712  return *this;
713  }
714 
715  // [7.8.4] const operations
716  /**
717  * @brief Gets the number of marked subexpressions within the regular
718  * expression.
719  */
720  unsigned int
721  mark_count() const noexcept
722  {
723  if (_M_automaton)
724  return _M_automaton->_M_sub_count() - 1;
725  return 0;
726  }
727 
728  /**
729  * @brief Gets the flags used to construct the regular expression
730  * or in the last call to assign().
731  */
732  flag_type
733  flags() const noexcept
734  { return _M_flags; }
735 
736  // [7.8.5] locale
737  /**
738  * @brief Imbues the regular expression object with the given locale.
739  *
740  * @param __loc A locale.
741  */
742  locale_type
743  imbue(locale_type __loc)
744  {
745  std::swap(__loc, _M_loc);
746  _M_automaton.reset();
747  return __loc;
748  }
749 
750  /**
751  * @brief Gets the locale currently imbued in the regular expression
752  * object.
753  */
754  locale_type
755  getloc() const noexcept
756  { return _M_loc; }
757 
758  // [7.8.6] swap
759  /**
760  * @brief Swaps the contents of two regular expression objects.
761  *
762  * @param __rhs Another regular expression object.
763  */
764  void
765  swap(basic_regex& __rhs) noexcept
766  {
767  std::swap(_M_flags, __rhs._M_flags);
768  std::swap(_M_loc, __rhs._M_loc);
769  std::swap(_M_automaton, __rhs._M_automaton);
770  }
771 
772 #ifdef _GLIBCXX_DEBUG
773  void
774  _M_dot(std::ostream& __ostr)
775  { _M_automaton->_M_dot(__ostr); }
776 #endif
777 
778  private:
780 
781  void
782  _M_compile(const _Ch_type* __first, const _Ch_type* __last,
783  flag_type __f)
784  {
785  __detail::_Compiler<_Rx_traits> __c(__first, __last, _M_loc, __f);
786  _M_automaton = __c._M_get_nfa();
787  _M_flags = __f;
788  }
789 
790  template<typename _Bp, typename _Ap, typename _Cp, typename _Rp,
791  __detail::_RegexExecutorPolicy, bool>
792  friend bool
793  __detail::__regex_algo_impl(_Bp, _Bp, match_results<_Bp, _Ap>&,
794  const basic_regex<_Cp, _Rp>&,
796 
797  template<typename, typename, typename, bool>
798  friend class __detail::_Executor;
799 
800  flag_type _M_flags;
801  locale_type _M_loc;
802  _AutomatonPtr _M_automaton;
803  };
804 
805 #if __cplusplus < 201703L
806  template<typename _Ch, typename _Tr>
809 
810  template<typename _Ch, typename _Tr>
813 
814  template<typename _Ch, typename _Tr>
817 
818  template<typename _Ch, typename _Tr>
821 
822  template<typename _Ch, typename _Tr>
825 
826  template<typename _Ch, typename _Tr>
829 
830  template<typename _Ch, typename _Tr>
833 
834  template<typename _Ch, typename _Tr>
837 
838  template<typename _Ch, typename _Tr>
841 
842  template<typename _Ch, typename _Tr>
845 #endif // ! C++17
846 
847 #if __cpp_deduction_guides >= 201606
848  template<typename _ForwardIterator>
849  basic_regex(_ForwardIterator, _ForwardIterator,
851  -> basic_regex<typename iterator_traits<_ForwardIterator>::value_type>;
852 #endif
853 
854  /** @brief Standard regular expressions. */
856 
857 #ifdef _GLIBCXX_USE_WCHAR_T
858  /** @brief Standard wide-character regular expressions. */
860 #endif
861 
862 
863  // [7.8.6] basic_regex swap
864  /**
865  * @brief Swaps the contents of two regular expression objects.
866  * @param __lhs First regular expression.
867  * @param __rhs Second regular expression.
868  * @relates basic_regex
869  */
870  template<typename _Ch_type, typename _Rx_traits>
871  inline void
873  basic_regex<_Ch_type, _Rx_traits>& __rhs) noexcept
874  { __lhs.swap(__rhs); }
875 
876 
877  // C++11 28.9 [re.submatch] Class template sub_match
878  /**
879  * A sequence of characters matched by a particular marked sub-expression.
880  *
881  * An object of this class is essentially a pair of iterators marking a
882  * matched subexpression within a regular expression pattern match. Such
883  * objects can be converted to and compared with std::basic_string objects
884  * of a similar base character type as the pattern matched by the regular
885  * expression.
886  *
887  * The iterators that make up the pair are the usual half-open interval
888  * referencing the actual original pattern matched.
889  */
890  template<typename _BiIter>
891  class sub_match : public std::pair<_BiIter, _BiIter>
892  {
894 
895  public:
896  typedef typename __iter_traits::value_type value_type;
897  typedef typename __iter_traits::difference_type difference_type;
898  typedef _BiIter iterator;
900 
901  bool matched;
902 
903  constexpr sub_match() noexcept : matched() { }
904 
905  /// Gets the length of the matching sequence.
906  difference_type
907  length() const noexcept
908  { return this->matched ? std::distance(this->first, this->second) : 0; }
909 
910  /**
911  * @brief Gets the matching sequence as a string.
912  *
913  * @returns the matching sequence as a string.
914  *
915  * This is the implicit conversion operator. It is identical to the
916  * str() member function except that it will want to pop up in
917  * unexpected places and cause a great deal of confusion and cursing
918  * from the unwary.
919  */
920  operator string_type() const
921  { return str(); }
922 
923  /**
924  * @brief Gets the matching sequence as a string.
925  *
926  * @returns the matching sequence as a string.
927  */
928  string_type
929  str() const
930  {
931  return this->matched
932  ? string_type(this->first, this->second)
933  : string_type();
934  }
935 
936  /**
937  * @brief Compares this and another matched sequence.
938  *
939  * @param __s Another matched sequence to compare to this one.
940  *
941  * @retval negative This matched sequence will collate before `__s`.
942  * @retval zero This matched sequence is equivalent to `__s`.
943  * @retval positive This matched sequence will collate after `__s`.
944  */
945  int
946  compare(const sub_match& __s) const
947  { return this->_M_str().compare(__s._M_str()); }
948 
949  /**
950  * @{
951  * @brief Compares this `sub_match` to a string.
952  *
953  * @param __s A string to compare to this `sub_match`.
954  *
955  * @retval negative This matched sequence will collate before `__s`.
956  * @retval zero This matched sequence is equivalent to `__s`.
957  * @retval positive This matched sequence will collate after `__s`.
958  */
959  int
960  compare(const string_type& __s) const
961  { return this->_M_str().compare(__s); }
962 
963  int
964  compare(const value_type* __s) const
965  { return this->_M_str().compare(__s); }
966  /// @}
967 
968  /// @cond undocumented
969  // Non-standard, used by comparison operators
970  int
971  _M_compare(const value_type* __s, size_t __n) const
972  { return this->_M_str().compare({__s, __n}); }
973  /// @endcond
974 
975  private:
976  // Simplified basic_string_view for C++11
977  struct __string_view
978  {
979  using traits_type = typename string_type::traits_type;
980 
981  __string_view() = default;
982 
983  __string_view(const value_type* __s, size_t __n) noexcept
984  : _M_data(__s), _M_len(__n) { }
985 
986  __string_view(const value_type* __s) noexcept
987  : _M_data(__s), _M_len(traits_type::length(__s)) { }
988 
989  __string_view(const string_type& __s) noexcept
990  : _M_data(__s.data()), _M_len(__s.length()) { }
991 
992  int
993  compare(__string_view __s) const noexcept
994  {
995  if (const size_t __n = std::min(_M_len, __s._M_len))
996  if (int __ret = traits_type::compare(_M_data, __s._M_data, __n))
997  return __ret;
998  using __limits = __gnu_cxx::__int_traits<int>;
999  const difference_type __diff = _M_len - __s._M_len;
1000  if (__diff > __limits::__max)
1001  return __limits::__max;
1002  if (__diff < __limits::__min)
1003  return __limits::__min;
1004  return static_cast<int>(__diff);
1005  }
1006 
1007  private:
1008  const value_type* _M_data = nullptr;
1009  size_t _M_len = 0;
1010  };
1011 
1012  // Create a __string_view over the iterator range.
1013  template<typename _Iter = _BiIter>
1014  __enable_if_t<__detail::__is_contiguous_iter<_Iter>::value,
1015  __string_view>
1016  _M_str() const noexcept
1017  {
1018  if (this->matched)
1019  if (size_t __len = this->second - this->first)
1020  return { std::__addressof(*this->first), __len };
1021  return {};
1022  }
1023 
1024  // Create a temporary string that can be converted to __string_view.
1025  template<typename _Iter = _BiIter>
1026  __enable_if_t<!__detail::__is_contiguous_iter<_Iter>::value,
1027  string_type>
1028  _M_str() const
1029  { return str(); }
1030  };
1031 
1032 
1033  /** @brief Standard regex submatch over a C-style null-terminated string. */
1035 
1036  /** @brief Standard regex submatch over a standard string. */
1038 
1039 #ifdef _GLIBCXX_USE_WCHAR_T
1040  /** @brief Regex submatch over a C-style null-terminated wide string. */
1042 
1043  /** @brief Regex submatch over a standard wide string. */
1045 #endif
1046 
1047  // [7.9.2] sub_match non-member operators
1048 
1049  /// @relates sub_match @{
1050 
1051  /**
1052  * @brief Tests the equivalence of two regular expression submatches.
1053  * @param __lhs First regular expression submatch.
1054  * @param __rhs Second regular expression submatch.
1055  * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
1056  */
1057  template<typename _BiIter>
1058  inline bool
1060  { return __lhs.compare(__rhs) == 0; }
1061 
1062 #if __cpp_lib_three_way_comparison
1063  /**
1064  * @brief Three-way comparison of two regular expression submatches.
1065  * @param __lhs First regular expression submatch.
1066  * @param __rhs Second regular expression submatch.
1067  * @returns A value indicating whether `__lhs` is less than, equal to,
1068  * greater than, or incomparable with `__rhs`.
1069  */
1070  template<typename _BiIter>
1071  inline auto
1072  operator<=>(const sub_match<_BiIter>& __lhs,
1073  const sub_match<_BiIter>& __rhs)
1074  noexcept(__detail::__is_contiguous_iter<_BiIter>::value)
1075  {
1077  return __detail::__char_traits_cmp_cat<_Tr>(__lhs.compare(__rhs));
1078  }
1079 #else
1080  /**
1081  * @brief Tests the inequivalence of two regular expression submatches.
1082  * @param __lhs First regular expression submatch.
1083  * @param __rhs Second regular expression submatch.
1084  * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
1085  */
1086  template<typename _BiIter>
1087  inline bool
1089  { return __lhs.compare(__rhs) != 0; }
1090 
1091  /**
1092  * @brief Tests the ordering of two regular expression submatches.
1093  * @param __lhs First regular expression submatch.
1094  * @param __rhs Second regular expression submatch.
1095  * @returns true if @a __lhs precedes @a __rhs, false otherwise.
1096  */
1097  template<typename _BiIter>
1098  inline bool
1099  operator<(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
1100  { return __lhs.compare(__rhs) < 0; }
1101 
1102  /**
1103  * @brief Tests the ordering of two regular expression submatches.
1104  * @param __lhs First regular expression submatch.
1105  * @param __rhs Second regular expression submatch.
1106  * @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
1107  */
1108  template<typename _BiIter>
1109  inline bool
1110  operator<=(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
1111  { return __lhs.compare(__rhs) <= 0; }
1112 
1113  /**
1114  * @brief Tests the ordering of two regular expression submatches.
1115  * @param __lhs First regular expression submatch.
1116  * @param __rhs Second regular expression submatch.
1117  * @returns true if @a __lhs does not precede @a __rhs, false otherwise.
1118  */
1119  template<typename _BiIter>
1120  inline bool
1122  { return __lhs.compare(__rhs) >= 0; }
1123 
1124  /**
1125  * @brief Tests the ordering of two regular expression submatches.
1126  * @param __lhs First regular expression submatch.
1127  * @param __rhs Second regular expression submatch.
1128  * @returns true if @a __lhs succeeds @a __rhs, false otherwise.
1129  */
1130  template<typename _BiIter>
1131  inline bool
1133  { return __lhs.compare(__rhs) > 0; }
1134 #endif // three-way comparison
1135 
1136  /// @cond undocumented
1137 
1138  // Alias for a basic_string that can be compared to a sub_match.
1139  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
1140  using __sub_match_string = basic_string<
1142  _Ch_traits, _Ch_alloc>;
1143  /// @endcond
1144 
1145 #if ! __cpp_lib_three_way_comparison
1146  /**
1147  * @brief Tests the equivalence of a string and a regular expression
1148  * submatch.
1149  * @param __lhs A string.
1150  * @param __rhs A regular expression submatch.
1151  * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
1152  */
1153  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
1154  inline bool
1155  operator==(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
1156  const sub_match<_Bi_iter>& __rhs)
1157  { return __rhs._M_compare(__lhs.data(), __lhs.size()) == 0; }
1158 
1159  /**
1160  * @brief Tests the inequivalence of a string and a regular expression
1161  * submatch.
1162  * @param __lhs A string.
1163  * @param __rhs A regular expression submatch.
1164  * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
1165  */
1166  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
1167  inline bool
1168  operator!=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
1169  const sub_match<_Bi_iter>& __rhs)
1170  { return !(__lhs == __rhs); }
1171 
1172  /**
1173  * @brief Tests the ordering of a string and a regular expression submatch.
1174  * @param __lhs A string.
1175  * @param __rhs A regular expression submatch.
1176  * @returns true if @a __lhs precedes @a __rhs, false otherwise.
1177  */
1178  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
1179  inline bool
1180  operator<(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
1181  const sub_match<_Bi_iter>& __rhs)
1182  { return __rhs._M_compare(__lhs.data(), __lhs.size()) > 0; }
1183 
1184  /**
1185  * @brief Tests the ordering of a string and a regular expression submatch.
1186  * @param __lhs A string.
1187  * @param __rhs A regular expression submatch.
1188  * @returns true if @a __lhs succeeds @a __rhs, false otherwise.
1189  */
1190  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
1191  inline bool
1192  operator>(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
1193  const sub_match<_Bi_iter>& __rhs)
1194  { return __rhs < __lhs; }
1195 
1196  /**
1197  * @brief Tests the ordering of a string and a regular expression submatch.
1198  * @param __lhs A string.
1199  * @param __rhs A regular expression submatch.
1200  * @returns true if @a __lhs does not precede @a __rhs, false otherwise.
1201  */
1202  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
1203  inline bool
1204  operator>=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
1205  const sub_match<_Bi_iter>& __rhs)
1206  { return !(__lhs < __rhs); }
1207 
1208  /**
1209  * @brief Tests the ordering of a string and a regular expression submatch.
1210  * @param __lhs A string.
1211  * @param __rhs A regular expression submatch.
1212  * @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
1213  */
1214  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
1215  inline bool
1216  operator<=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
1217  const sub_match<_Bi_iter>& __rhs)
1218  { return !(__rhs < __lhs); }
1219 #endif // three-way comparison
1220 
1221  /**
1222  * @brief Tests the equivalence of a regular expression submatch and a
1223  * string.
1224  * @param __lhs A regular expression submatch.
1225  * @param __rhs A string.
1226  * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
1227  */
1228  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
1229  inline bool
1231  const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
1232  { return __lhs._M_compare(__rhs.data(), __rhs.size()) == 0; }
1233 
1234 #if __cpp_lib_three_way_comparison
1235  /**
1236  * @brief Three-way comparison of a regular expression submatch and a string.
1237  * @param __lhs A regular expression submatch.
1238  * @param __rhs A string.
1239  * @returns A value indicating whether `__lhs` is less than, equal to,
1240  * greater than, or incomparable with `__rhs`.
1241  */
1242  template<typename _Bi_iter, typename _Ch_traits, typename _Alloc>
1243  inline auto
1244  operator<=>(const sub_match<_Bi_iter>& __lhs,
1245  const __sub_match_string<_Bi_iter, _Ch_traits, _Alloc>& __rhs)
1246  noexcept(__detail::__is_contiguous_iter<_Bi_iter>::value)
1247  {
1248  return __detail::__char_traits_cmp_cat<_Ch_traits>(
1249  __lhs._M_compare(__rhs.data(), __rhs.size()));
1250  }
1251 #else
1252  /**
1253  * @brief Tests the inequivalence of a regular expression submatch and a
1254  * string.
1255  * @param __lhs A regular expression submatch.
1256  * @param __rhs A string.
1257  * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
1258  */
1259  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
1260  inline bool
1262  const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
1263  { return !(__lhs == __rhs); }
1264 
1265  /**
1266  * @brief Tests the ordering of a regular expression submatch and a string.
1267  * @param __lhs A regular expression submatch.
1268  * @param __rhs A string.
1269  * @returns true if @a __lhs precedes @a __rhs, false otherwise.
1270  */
1271  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
1272  inline bool
1273  operator<(const sub_match<_Bi_iter>& __lhs,
1274  const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
1275  { return __lhs._M_compare(__rhs.data(), __rhs.size()) < 0; }
1276 
1277  /**
1278  * @brief Tests the ordering of a regular expression submatch and a string.
1279  * @param __lhs A regular expression submatch.
1280  * @param __rhs A string.
1281  * @returns true if @a __lhs succeeds @a __rhs, false otherwise.
1282  */
1283  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
1284  inline bool
1286  const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
1287  { return __rhs < __lhs; }
1288 
1289  /**
1290  * @brief Tests the ordering of a regular expression submatch and a string.
1291  * @param __lhs A regular expression submatch.
1292  * @param __rhs A string.
1293  * @returns true if @a __lhs does not precede @a __rhs, false otherwise.
1294  */
1295  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
1296  inline bool
1298  const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
1299  { return !(__lhs < __rhs); }
1300 
1301  /**
1302  * @brief Tests the ordering of a regular expression submatch and a string.
1303  * @param __lhs A regular expression submatch.
1304  * @param __rhs A string.
1305  * @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
1306  */
1307  template<typename _Bi_iter, typename _Ch_traits, typename _Ch_alloc>
1308  inline bool
1309  operator<=(const sub_match<_Bi_iter>& __lhs,
1310  const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __rhs)
1311  { return !(__rhs < __lhs); }
1312 
1313  /**
1314  * @brief Tests the equivalence of a C string and a regular expression
1315  * submatch.
1316  * @param __lhs A null-terminated string.
1317  * @param __rhs A regular expression submatch.
1318  * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
1319  */
1320  template<typename _Bi_iter>
1321  inline bool
1323  const sub_match<_Bi_iter>& __rhs)
1324  { return __rhs.compare(__lhs) == 0; }
1325 
1326  /**
1327  * @brief Tests the inequivalence of a C string and a regular
1328  * expression submatch.
1329  * @param __lhs A null-terminated string.
1330  * @param __rhs A regular expression submatch.
1331  * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
1332  */
1333  template<typename _Bi_iter>
1334  inline bool
1336  const sub_match<_Bi_iter>& __rhs)
1337  { return !(__lhs == __rhs); }
1338 
1339  /**
1340  * @brief Tests the ordering of a C string and a regular expression submatch.
1341  * @param __lhs A null-terminated string.
1342  * @param __rhs A regular expression submatch.
1343  * @returns true if @a __lhs precedes @a __rhs, false otherwise.
1344  */
1345  template<typename _Bi_iter>
1346  inline bool
1347  operator<(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
1348  const sub_match<_Bi_iter>& __rhs)
1349  { return __rhs.compare(__lhs) > 0; }
1350 
1351  /**
1352  * @brief Tests the ordering of a C string and a regular expression submatch.
1353  * @param __lhs A null-terminated string.
1354  * @param __rhs A regular expression submatch.
1355  * @returns true if @a __lhs succeeds @a __rhs, false otherwise.
1356  */
1357  template<typename _Bi_iter>
1358  inline bool
1360  const sub_match<_Bi_iter>& __rhs)
1361  { return __rhs < __lhs; }
1362 
1363  /**
1364  * @brief Tests the ordering of a C string and a regular expression submatch.
1365  * @param __lhs A null-terminated string.
1366  * @param __rhs A regular expression submatch.
1367  * @returns true if @a __lhs does not precede @a __rhs, false otherwise.
1368  */
1369  template<typename _Bi_iter>
1370  inline bool
1372  const sub_match<_Bi_iter>& __rhs)
1373  { return !(__lhs < __rhs); }
1374 
1375  /**
1376  * @brief Tests the ordering of a C string and a regular expression submatch.
1377  * @param __lhs A null-terminated string.
1378  * @param __rhs A regular expression submatch.
1379  * @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
1380  */
1381  template<typename _Bi_iter>
1382  inline bool
1383  operator<=(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
1384  const sub_match<_Bi_iter>& __rhs)
1385  { return !(__rhs < __lhs); }
1386 #endif // three-way comparison
1387 
1388  /**
1389  * @brief Tests the equivalence of a regular expression submatch and a C
1390  * string.
1391  * @param __lhs A regular expression submatch.
1392  * @param __rhs A null-terminated string.
1393  * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
1394  */
1395  template<typename _Bi_iter>
1396  inline bool
1398  typename iterator_traits<_Bi_iter>::value_type const* __rhs)
1399  { return __lhs.compare(__rhs) == 0; }
1400 
1401 #if __cpp_lib_three_way_comparison
1402  /**
1403  * @brief Three-way comparison of a regular expression submatch and a C
1404  * string.
1405  * @param __lhs A regular expression submatch.
1406  * @param __rhs A null-terminated string.
1407  * @returns A value indicating whether `__lhs` is less than, equal to,
1408  * greater than, or incomparable with `__rhs`.
1409  */
1410  template<typename _Bi_iter>
1411  inline auto
1412  operator<=>(const sub_match<_Bi_iter>& __lhs,
1413  typename iterator_traits<_Bi_iter>::value_type const* __rhs)
1414  noexcept(__detail::__is_contiguous_iter<_Bi_iter>::value)
1415  {
1417  return __detail::__char_traits_cmp_cat<_Tr>(__lhs.compare(__rhs));
1418  }
1419 #else
1420  /**
1421  * @brief Tests the inequivalence of a regular expression submatch and a
1422  * string.
1423  * @param __lhs A regular expression submatch.
1424  * @param __rhs A null-terminated string.
1425  * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
1426  */
1427  template<typename _Bi_iter>
1428  inline bool
1430  typename iterator_traits<_Bi_iter>::value_type const* __rhs)
1431  { return !(__lhs == __rhs); }
1432 
1433  /**
1434  * @brief Tests the ordering of a regular expression submatch and a C string.
1435  * @param __lhs A regular expression submatch.
1436  * @param __rhs A null-terminated string.
1437  * @returns true if @a __lhs precedes @a __rhs, false otherwise.
1438  */
1439  template<typename _Bi_iter>
1440  inline bool
1441  operator<(const sub_match<_Bi_iter>& __lhs,
1442  typename iterator_traits<_Bi_iter>::value_type const* __rhs)
1443  { return __lhs.compare(__rhs) < 0; }
1444 
1445  /**
1446  * @brief Tests the ordering of a regular expression submatch and a C string.
1447  * @param __lhs A regular expression submatch.
1448  * @param __rhs A null-terminated string.
1449  * @returns true if @a __lhs succeeds @a __rhs, false otherwise.
1450  */
1451  template<typename _Bi_iter>
1452  inline bool
1454  typename iterator_traits<_Bi_iter>::value_type const* __rhs)
1455  { return __rhs < __lhs; }
1456 
1457  /**
1458  * @brief Tests the ordering of a regular expression submatch and a C string.
1459  * @param __lhs A regular expression submatch.
1460  * @param __rhs A null-terminated string.
1461  * @returns true if @a __lhs does not precede @a __rhs, false otherwise.
1462  */
1463  template<typename _Bi_iter>
1464  inline bool
1466  typename iterator_traits<_Bi_iter>::value_type const* __rhs)
1467  { return !(__lhs < __rhs); }
1468 
1469  /**
1470  * @brief Tests the ordering of a regular expression submatch and a C string.
1471  * @param __lhs A regular expression submatch.
1472  * @param __rhs A null-terminated string.
1473  * @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
1474  */
1475  template<typename _Bi_iter>
1476  inline bool
1477  operator<=(const sub_match<_Bi_iter>& __lhs,
1478  typename iterator_traits<_Bi_iter>::value_type const* __rhs)
1479  { return !(__rhs < __lhs); }
1480 
1481  /**
1482  * @brief Tests the equivalence of a character and a regular expression
1483  * submatch.
1484  * @param __lhs A character.
1485  * @param __rhs A regular expression submatch.
1486  * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
1487  */
1488  template<typename _Bi_iter>
1489  inline bool
1491  const sub_match<_Bi_iter>& __rhs)
1492  { return __rhs._M_compare(std::__addressof(__lhs), 1) == 0; }
1493 
1494  /**
1495  * @brief Tests the inequivalence of a character and a regular expression
1496  * submatch.
1497  * @param __lhs A character.
1498  * @param __rhs A regular expression submatch.
1499  * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
1500  */
1501  template<typename _Bi_iter>
1502  inline bool
1504  const sub_match<_Bi_iter>& __rhs)
1505  { return !(__lhs == __rhs); }
1506 
1507  /**
1508  * @brief Tests the ordering of a character and a regular expression
1509  * submatch.
1510  * @param __lhs A character.
1511  * @param __rhs A regular expression submatch.
1512  * @returns true if @a __lhs precedes @a __rhs, false otherwise.
1513  */
1514  template<typename _Bi_iter>
1515  inline bool
1516  operator<(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
1517  const sub_match<_Bi_iter>& __rhs)
1518  { return __rhs._M_compare(std::__addressof(__lhs), 1) > 0; }
1519 
1520  /**
1521  * @brief Tests the ordering of a character and a regular expression
1522  * submatch.
1523  * @param __lhs A character.
1524  * @param __rhs A regular expression submatch.
1525  * @returns true if @a __lhs succeeds @a __rhs, false otherwise.
1526  */
1527  template<typename _Bi_iter>
1528  inline bool
1530  const sub_match<_Bi_iter>& __rhs)
1531  { return __rhs < __lhs; }
1532 
1533  /**
1534  * @brief Tests the ordering of a character and a regular expression
1535  * submatch.
1536  * @param __lhs A character.
1537  * @param __rhs A regular expression submatch.
1538  * @returns true if @a __lhs does not precede @a __rhs, false otherwise.
1539  */
1540  template<typename _Bi_iter>
1541  inline bool
1543  const sub_match<_Bi_iter>& __rhs)
1544  { return !(__lhs < __rhs); }
1545 
1546  /**
1547  * @brief Tests the ordering of a character and a regular expression
1548  * submatch.
1549  * @param __lhs A character.
1550  * @param __rhs A regular expression submatch.
1551  * @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
1552  */
1553  template<typename _Bi_iter>
1554  inline bool
1555  operator<=(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
1556  const sub_match<_Bi_iter>& __rhs)
1557  { return !(__rhs < __lhs); }
1558 #endif // three-way comparison
1559 
1560  /**
1561  * @brief Tests the equivalence of a regular expression submatch and a
1562  * character.
1563  * @param __lhs A regular expression submatch.
1564  * @param __rhs A character.
1565  * @returns true if @a __lhs is equivalent to @a __rhs, false otherwise.
1566  */
1567  template<typename _Bi_iter>
1568  inline bool
1570  typename iterator_traits<_Bi_iter>::value_type const& __rhs)
1571  { return __lhs._M_compare(std::__addressof(__rhs), 1) == 0; }
1572 
1573 #if __cpp_lib_three_way_comparison
1574  /**
1575  * @brief Three-way comparison of a regular expression submatch and a
1576  * character.
1577  * @param __lhs A regular expression submatch.
1578  * @param __rhs A character.
1579  * @returns A value indicating whether `__lhs` is less than, equal to,
1580  * greater than, or incomparable with `__rhs`.
1581  */
1582 
1583  template<typename _Bi_iter>
1584  inline auto
1585  operator<=>(const sub_match<_Bi_iter>& __lhs,
1586  typename iterator_traits<_Bi_iter>::value_type const& __rhs)
1587  noexcept(__detail::__is_contiguous_iter<_Bi_iter>::value)
1588  {
1590  return __detail::__char_traits_cmp_cat<_Tr>(
1591  __lhs._M_compare(std::__addressof(__rhs), 1));
1592  }
1593 #else
1594  /**
1595  * @brief Tests the inequivalence of a regular expression submatch and a
1596  * character.
1597  * @param __lhs A regular expression submatch.
1598  * @param __rhs A character.
1599  * @returns true if @a __lhs is not equivalent to @a __rhs, false otherwise.
1600  */
1601  template<typename _Bi_iter>
1602  inline bool
1604  typename iterator_traits<_Bi_iter>::value_type const& __rhs)
1605  { return !(__lhs == __rhs); }
1606 
1607  /**
1608  * @brief Tests the ordering of a regular expression submatch and a
1609  * character.
1610  * @param __lhs A regular expression submatch.
1611  * @param __rhs A character.
1612  * @returns true if @a __lhs precedes @a __rhs, false otherwise.
1613  */
1614  template<typename _Bi_iter>
1615  inline bool
1616  operator<(const sub_match<_Bi_iter>& __lhs,
1617  typename iterator_traits<_Bi_iter>::value_type const& __rhs)
1618  { return __lhs._M_compare(std::__addressof(__rhs), 1) < 0; }
1619 
1620  /**
1621  * @brief Tests the ordering of a regular expression submatch and a
1622  * character.
1623  * @param __lhs A regular expression submatch.
1624  * @param __rhs A character.
1625  * @returns true if @a __lhs succeeds @a __rhs, false otherwise.
1626  */
1627  template<typename _Bi_iter>
1628  inline bool
1630  typename iterator_traits<_Bi_iter>::value_type const& __rhs)
1631  { return __rhs < __lhs; }
1632 
1633  /**
1634  * @brief Tests the ordering of a regular expression submatch and a
1635  * character.
1636  * @param __lhs A regular expression submatch.
1637  * @param __rhs A character.
1638  * @returns true if @a __lhs does not precede @a __rhs, false otherwise.
1639  */
1640  template<typename _Bi_iter>
1641  inline bool
1643  typename iterator_traits<_Bi_iter>::value_type const& __rhs)
1644  { return !(__lhs < __rhs); }
1645 
1646  /**
1647  * @brief Tests the ordering of a regular expression submatch and a
1648  * character.
1649  * @param __lhs A regular expression submatch.
1650  * @param __rhs A character.
1651  * @returns true if @a __lhs does not succeed @a __rhs, false otherwise.
1652  */
1653  template<typename _Bi_iter>
1654  inline bool
1655  operator<=(const sub_match<_Bi_iter>& __lhs,
1656  typename iterator_traits<_Bi_iter>::value_type const& __rhs)
1657  { return !(__rhs < __lhs); }
1658 #endif // three-way comparison
1659 
1660  /**
1661  * @brief Inserts a matched string into an output stream.
1662  *
1663  * @param __os The output stream.
1664  * @param __m A submatch string.
1665  *
1666  * @returns the output stream with the submatch string inserted.
1667  */
1668  template<typename _Ch_type, typename _Ch_traits, typename _Bi_iter>
1669  inline
1672  const sub_match<_Bi_iter>& __m)
1673  { return __os << __m.str(); }
1674 
1675  /// @} relates sub_match
1676 
1677  // [7.10] Class template match_results
1678 
1679  /**
1680  * @brief The results of a match or search operation.
1681  *
1682  * A collection of character sequences representing the result of a regular
1683  * expression match. Storage for the collection is allocated and freed as
1684  * necessary by the member functions of class template match_results.
1685  *
1686  * This class satisfies the Sequence requirements, with the exception that
1687  * only the operations defined for a const-qualified Sequence are supported.
1688  *
1689  * The sub_match object stored at index 0 represents sub-expression 0, i.e.
1690  * the whole match. In this case the %sub_match member matched is always true.
1691  * The sub_match object stored at index n denotes what matched the marked
1692  * sub-expression n within the matched expression. If the sub-expression n
1693  * participated in a regular expression match then the %sub_match member
1694  * matched evaluates to true, and members first and second denote the range
1695  * of characters [first, second) which formed that match. Otherwise matched
1696  * is false, and members first and second point to the end of the sequence
1697  * that was searched.
1698  */
1699  template<typename _Bi_iter,
1700  typename _Alloc = allocator<sub_match<_Bi_iter> > >
1702  : private std::vector<sub_match<_Bi_iter>, _Alloc>
1703  {
1704  private:
1705  /*
1706  * The vector base is empty if this does not represent a match (!ready());
1707  * Otherwise if it's a match failure, it contains 3 elements:
1708  * [0] unmatched
1709  * [1] prefix
1710  * [2] suffix
1711  * Otherwise it contains n+4 elements where n is the number of marked
1712  * sub-expressions:
1713  * [0] entire match
1714  * [1] 1st marked subexpression
1715  * ...
1716  * [n] nth marked subexpression
1717  * [n+1] unmatched
1718  * [n+2] prefix
1719  * [n+3] suffix
1720  */
1724 
1725  public:
1726  /**
1727  * @name 28.10 Public Types
1728  */
1729  ///@{
1731  typedef const value_type& const_reference;
1732  typedef value_type& reference;
1733  typedef typename _Base_type::const_iterator const_iterator;
1734  typedef const_iterator iterator;
1735  typedef typename __iter_traits::difference_type difference_type;
1736  typedef typename allocator_traits<_Alloc>::size_type size_type;
1737  typedef _Alloc allocator_type;
1738  typedef typename __iter_traits::value_type char_type;
1740  ///@}
1741 
1742  public:
1743  /**
1744  * @name 28.10.1 Construction, Copying, and Destruction
1745  */
1746  ///@{
1747 
1748  /**
1749  * @brief Constructs a default %match_results container.
1750  * @post size() returns 0 and str() returns an empty string.
1751  */
1752  match_results() : match_results(_Alloc()) { }
1753 
1754  /**
1755  * @brief Constructs a default %match_results container.
1756  * @post size() returns 0 and str() returns an empty string.
1757  */
1758  explicit
1759  match_results(const _Alloc& __a) noexcept
1760  : _Base_type(__a)
1761  { }
1762 
1763  /**
1764  * @brief Copy constructs a %match_results.
1765  */
1766  match_results(const match_results&) = default;
1767 
1768  /**
1769  * @brief Move constructs a %match_results.
1770  */
1771  match_results(match_results&&) noexcept = default;
1772 
1773  /**
1774  * @brief Assigns rhs to *this.
1775  */
1776  match_results&
1777  operator=(const match_results&) = default;
1778 
1779  /**
1780  * @brief Move-assigns rhs to *this.
1781  */
1782  match_results&
1783  operator=(match_results&&) = default;
1784 
1785  /**
1786  * @brief Destroys a %match_results object.
1787  */
1788  ~match_results() = default;
1789 
1790  ///@}
1791 
1792  // 28.10.2, state:
1793  /**
1794  * @brief Indicates if the %match_results is ready.
1795  * @retval true The object has a fully-established result state.
1796  * @retval false The object is not ready.
1797  */
1798  bool ready() const noexcept { return !_Base_type::empty(); }
1799 
1800  /**
1801  * @name 28.10.2 Size
1802  */
1803  ///@{
1804 
1805  /**
1806  * @brief Gets the number of matches and submatches.
1807  *
1808  * The number of matches for a given regular expression will be either 0
1809  * if there was no match or mark_count() + 1 if a match was successful.
1810  * Some matches may be empty.
1811  *
1812  * @returns the number of matches found.
1813  */
1814  size_type
1815  size() const noexcept
1816  { return _Base_type::empty() ? 0 : _Base_type::size() - 3; }
1817 
1818  size_type
1819  max_size() const noexcept
1820  { return _Base_type::max_size() - 3; }
1821 
1822  /**
1823  * @brief Indicates if the %match_results contains no results.
1824  * @retval true The %match_results object is empty.
1825  * @retval false The %match_results object is not empty.
1826  */
1827  _GLIBCXX_NODISCARD bool
1828  empty() const noexcept
1829  { return _Base_type::size() <= 3; }
1830 
1831  ///@}
1832 
1833  /**
1834  * @name 28.10.4 Element Access
1835  */
1836  ///@{
1837 
1838  /**
1839  * @brief Gets the length of the indicated submatch.
1840  * @param __sub indicates the submatch.
1841  * @pre ready() == true
1842  *
1843  * This function returns the length of the indicated submatch, or the
1844  * length of the entire match if @p __sub is zero (the default).
1845  */
1846  difference_type
1847  length(size_type __sub = 0) const
1848  { return (*this)[__sub].length(); }
1849 
1850  /**
1851  * @brief Gets the offset of the beginning of the indicated submatch.
1852  * @param __sub indicates the submatch.
1853  * @pre ready() == true
1854  *
1855  * This function returns the offset from the beginning of the target
1856  * sequence to the beginning of the submatch, unless the value of @p __sub
1857  * is zero (the default), in which case this function returns the offset
1858  * from the beginning of the target sequence to the beginning of the
1859  * match.
1860  */
1861  difference_type
1862  position(size_type __sub = 0) const
1863  { return std::distance(_M_begin, (*this)[__sub].first); }
1864 
1865  /**
1866  * @brief Gets the match or submatch converted to a string type.
1867  * @param __sub indicates the submatch.
1868  * @pre ready() == true
1869  *
1870  * This function gets the submatch (or match, if @p __sub is
1871  * zero) extracted from the target range and converted to the
1872  * associated string type.
1873  */
1874  string_type
1875  str(size_type __sub = 0) const
1876  { return string_type((*this)[__sub]); }
1877 
1878  /**
1879  * @brief Gets a %sub_match reference for the match or submatch.
1880  * @param __sub indicates the submatch.
1881  * @pre ready() == true
1882  *
1883  * This function gets a reference to the indicated submatch, or
1884  * the entire match if @p __sub is zero.
1885  *
1886  * If @p __sub >= size() then this function returns a %sub_match with a
1887  * special value indicating no submatch.
1888  */
1889  const_reference
1890  operator[](size_type __sub) const
1891  {
1892  __glibcxx_assert( ready() );
1893  return __sub < size()
1894  ? _Base_type::operator[](__sub)
1895  : _M_unmatched_sub();
1896  }
1897 
1898  /**
1899  * @brief Gets a %sub_match representing the match prefix.
1900  * @pre ready() == true
1901  *
1902  * This function gets a reference to a %sub_match object representing the
1903  * part of the target range between the start of the target range and the
1904  * start of the match.
1905  */
1906  const_reference
1907  prefix() const
1908  {
1909  __glibcxx_assert( ready() );
1910  return !empty() ? _M_prefix() : _M_unmatched_sub();
1911  }
1912 
1913  /**
1914  * @brief Gets a %sub_match representing the match suffix.
1915  * @pre ready() == true
1916  *
1917  * This function gets a reference to a %sub_match object representing the
1918  * part of the target range between the end of the match and the end of
1919  * the target range.
1920  */
1921  const_reference
1922  suffix() const
1923  {
1924  __glibcxx_assert( ready() );
1925  return !empty() ? _M_suffix() : _M_unmatched_sub();
1926  }
1927 
1928  /**
1929  * @brief Gets an iterator to the start of the %sub_match collection.
1930  */
1931  const_iterator
1932  begin() const noexcept
1933  { return _Base_type::begin(); }
1934 
1935  /**
1936  * @brief Gets an iterator to the start of the %sub_match collection.
1937  */
1938  const_iterator
1939  cbegin() const noexcept
1940  { return this->begin(); }
1941 
1942  /**
1943  * @brief Gets an iterator to one-past-the-end of the collection.
1944  */
1945  const_iterator
1946  end() const noexcept
1947  { return _Base_type::end() - (_Base_type::empty() ? 0 : 3); }
1948 
1949  /**
1950  * @brief Gets an iterator to one-past-the-end of the collection.
1951  */
1952  const_iterator
1953  cend() const noexcept
1954  { return this->end(); }
1955 
1956  ///@}
1957 
1958  /**
1959  * @name 28.10.5 Formatting
1960  *
1961  * These functions perform formatted substitution of the matched
1962  * character sequences into their target. The format specifiers and
1963  * escape sequences accepted by these functions are determined by
1964  * their @p flags parameter as documented above.
1965  */
1966  ///@{
1967 
1968  /**
1969  * @pre ready() == true
1970  */
1971  template<typename _Out_iter>
1972  _Out_iter
1973  format(_Out_iter __out, const char_type* __fmt_first,
1974  const char_type* __fmt_last,
1976 
1977  /**
1978  * @pre ready() == true
1979  */
1980  template<typename _Out_iter, typename _St, typename _Sa>
1981  _Out_iter
1982  format(_Out_iter __out, const basic_string<char_type, _St, _Sa>& __fmt,
1984  {
1985  return format(__out, __fmt.data(), __fmt.data() + __fmt.size(),
1986  __flags);
1987  }
1988 
1989  /**
1990  * @pre ready() == true
1991  */
1992  template<typename _St, typename _Sa>
1996  {
1998  format(std::back_inserter(__result), __fmt, __flags);
1999  return __result;
2000  }
2001 
2002  /**
2003  * @pre ready() == true
2004  */
2005  string_type
2006  format(const char_type* __fmt,
2008  {
2009  string_type __result;
2010  format(std::back_inserter(__result),
2011  __fmt,
2012  __fmt + char_traits<char_type>::length(__fmt),
2013  __flags);
2014  return __result;
2015  }
2016 
2017  ///@}
2018 
2019  /**
2020  * @name 28.10.6 Allocator
2021  */
2022  ///@{
2023 
2024  /**
2025  * @brief Gets a copy of the allocator.
2026  */
2027  allocator_type
2028  get_allocator() const noexcept
2029  { return _Base_type::get_allocator(); }
2030 
2031  ///@}
2032 
2033  /**
2034  * @name 28.10.7 Swap
2035  */
2036  ///@{
2037 
2038  /**
2039  * @brief Swaps the contents of two match_results.
2040  */
2041  void
2042  swap(match_results& __that) noexcept
2043  {
2044  using std::swap;
2045  _Base_type::swap(__that);
2046  swap(_M_begin, __that._M_begin);
2047  }
2048  ///@}
2049 
2050  private:
2051  template<typename, typename, typename>
2052  friend class regex_iterator;
2053 
2054  /// @cond undocumented
2055 
2056  template<typename, typename, typename, bool>
2057  friend class __detail::_Executor;
2058 
2059  template<typename _Bp, typename _Ap, typename _Cp, typename _Rp,
2060  __detail::_RegexExecutorPolicy, bool>
2061  friend bool
2062  __detail::__regex_algo_impl(_Bp, _Bp, match_results<_Bp, _Ap>&,
2063  const basic_regex<_Cp, _Rp>&,
2065 
2066  // Reset contents to __size unmatched sub_match objects
2067  // (plus additional objects for prefix, suffix and unmatched sub).
2068  void
2069  _M_resize(unsigned int __size)
2070  { _Base_type::assign(__size + 3, sub_match<_Bi_iter>{}); }
2071 
2072  // Set state to a failed match for the given past-the-end iterator.
2073  void
2074  _M_establish_failed_match(_Bi_iter __end)
2075  {
2076  sub_match<_Bi_iter> __sm;
2077  __sm.first = __sm.second = __end;
2078  _Base_type::assign(3, __sm);
2079  }
2080 
2081  const_reference
2082  _M_unmatched_sub() const
2083  { return _Base_type::operator[](_Base_type::size() - 3); }
2084 
2085  sub_match<_Bi_iter>&
2086  _M_unmatched_sub()
2087  { return _Base_type::operator[](_Base_type::size() - 3); }
2088 
2089  const_reference
2090  _M_prefix() const
2091  { return _Base_type::operator[](_Base_type::size() - 2); }
2092 
2093  sub_match<_Bi_iter>&
2094  _M_prefix()
2095  { return _Base_type::operator[](_Base_type::size() - 2); }
2096 
2097  const_reference
2098  _M_suffix() const
2099  { return _Base_type::operator[](_Base_type::size() - 1); }
2100 
2101  sub_match<_Bi_iter>&
2102  _M_suffix()
2103  { return _Base_type::operator[](_Base_type::size() - 1); }
2104 
2105  _Bi_iter _M_begin {};
2106  /// @endcond
2107  };
2108 
2109  typedef match_results<const char*> cmatch;
2110  typedef match_results<string::const_iterator> smatch;
2111 #ifdef _GLIBCXX_USE_WCHAR_T
2112  typedef match_results<const wchar_t*> wcmatch;
2113  typedef match_results<wstring::const_iterator> wsmatch;
2114 #endif
2115 
2116  // match_results comparisons
2117 
2118  /**
2119  * @brief Compares two match_results for equality.
2120  * @returns true if the two objects refer to the same match,
2121  * false otherwise.
2122  */
2123  template<typename _Bi_iter, typename _Alloc>
2124  inline bool
2126  const match_results<_Bi_iter, _Alloc>& __m2)
2127  {
2128  if (__m1.ready() != __m2.ready())
2129  return false;
2130  if (!__m1.ready()) // both are not ready
2131  return true;
2132  if (__m1.empty() != __m2.empty())
2133  return false;
2134  if (__m1.empty()) // both are empty
2135  return true;
2136  return __m1.prefix() == __m2.prefix()
2137  && __m1.size() == __m2.size()
2138  && std::equal(__m1.begin(), __m1.end(), __m2.begin())
2139  && __m1.suffix() == __m2.suffix();
2140  }
2141 
2142 #if ! __cpp_lib_three_way_comparison
2143  /**
2144  * @brief Compares two match_results for inequality.
2145  * @returns true if the two objects do not refer to the same match,
2146  * false otherwise.
2147  */
2148  template<typename _Bi_iter, class _Alloc>
2149  inline bool
2151  const match_results<_Bi_iter, _Alloc>& __m2)
2152  { return !(__m1 == __m2); }
2153 #endif
2154 
2155  // [7.10.6] match_results swap
2156  /**
2157  * @brief Swaps two match results.
2158  * @param __lhs A match result.
2159  * @param __rhs A match result.
2160  *
2161  * The contents of the two match_results objects are swapped.
2162  */
2163  template<typename _Bi_iter, typename _Alloc>
2164  inline void
2166  match_results<_Bi_iter, _Alloc>& __rhs) noexcept
2167  { __lhs.swap(__rhs); }
2168 
2169 _GLIBCXX_END_NAMESPACE_CXX11
2170 
2171  // [28.11.2] Function template regex_match
2172  /**
2173  * @name Matching, Searching, and Replacing
2174  */
2175  ///@{
2176 
2177  /**
2178  * @brief Determines if there is a match between the regular expression @p e
2179  * and all of the character sequence [first, last).
2180  *
2181  * @param __s Start of the character sequence to match.
2182  * @param __e One-past-the-end of the character sequence to match.
2183  * @param __m The match results.
2184  * @param __re The regular expression.
2185  * @param __flags Controls how the regular expression is matched.
2186  *
2187  * @retval true A match exists.
2188  * @retval false Otherwise.
2189  *
2190  * @throws an exception of type regex_error.
2191  */
2192  template<typename _Bi_iter, typename _Alloc,
2193  typename _Ch_type, typename _Rx_traits>
2194  inline bool
2195  regex_match(_Bi_iter __s,
2196  _Bi_iter __e,
2201  {
2202  return __detail::__regex_algo_impl<_Bi_iter, _Alloc, _Ch_type, _Rx_traits,
2203  __detail::_RegexExecutorPolicy::_S_auto, true>
2204  (__s, __e, __m, __re, __flags);
2205  }
2206 
2207  /**
2208  * @brief Indicates if there is a match between the regular expression @p e
2209  * and all of the character sequence [first, last).
2210  *
2211  * @param __first Beginning of the character sequence to match.
2212  * @param __last One-past-the-end of the character sequence to match.
2213  * @param __re The regular expression.
2214  * @param __flags Controls how the regular expression is matched.
2215  *
2216  * @retval true A match exists.
2217  * @retval false Otherwise.
2218  *
2219  * @throws an exception of type regex_error.
2220  */
2221  template<typename _Bi_iter, typename _Ch_type, typename _Rx_traits>
2222  inline bool
2223  regex_match(_Bi_iter __first, _Bi_iter __last,
2227  {
2228  match_results<_Bi_iter> __what;
2229  return regex_match(__first, __last, __what, __re, __flags);
2230  }
2231 
2232  /**
2233  * @brief Determines if there is a match between the regular expression @p e
2234  * and a C-style null-terminated string.
2235  *
2236  * @param __s The C-style null-terminated string to match.
2237  * @param __m The match results.
2238  * @param __re The regular expression.
2239  * @param __f Controls how the regular expression is matched.
2240  *
2241  * @retval true A match exists.
2242  * @retval false Otherwise.
2243  *
2244  * @throws an exception of type regex_error.
2245  */
2246  template<typename _Ch_type, typename _Alloc, typename _Rx_traits>
2247  inline bool
2248  regex_match(const _Ch_type* __s,
2253  { return regex_match(__s, __s + _Rx_traits::length(__s), __m, __re, __f); }
2254 
2255  /**
2256  * @brief Determines if there is a match between the regular expression @p e
2257  * and a string.
2258  *
2259  * @param __s The string to match.
2260  * @param __m The match results.
2261  * @param __re The regular expression.
2262  * @param __flags Controls how the regular expression is matched.
2263  *
2264  * @retval true A match exists.
2265  * @retval false Otherwise.
2266  *
2267  * @throws an exception of type regex_error.
2268  */
2269  template<typename _Ch_traits, typename _Ch_alloc,
2270  typename _Alloc, typename _Ch_type, typename _Rx_traits>
2271  inline bool
2273  match_results<typename basic_string<_Ch_type,
2274  _Ch_traits, _Ch_alloc>::const_iterator, _Alloc>& __m,
2278  { return regex_match(__s.begin(), __s.end(), __m, __re, __flags); }
2279 
2280  // _GLIBCXX_RESOLVE_LIB_DEFECTS
2281  // 2329. regex_match() with match_results should forbid temporary strings
2282  /// Prevent unsafe attempts to get match_results from a temporary string.
2283  template<typename _Ch_traits, typename _Ch_alloc,
2284  typename _Alloc, typename _Ch_type, typename _Rx_traits>
2285  bool
2287  match_results<typename basic_string<_Ch_type,
2288  _Ch_traits, _Ch_alloc>::const_iterator, _Alloc>&,
2291  = regex_constants::match_default) = delete;
2292 
2293  /**
2294  * @brief Indicates if there is a match between the regular expression @p e
2295  * and a C-style null-terminated string.
2296  *
2297  * @param __s The C-style null-terminated string to match.
2298  * @param __re The regular expression.
2299  * @param __f Controls how the regular expression is matched.
2300  *
2301  * @retval true A match exists.
2302  * @retval false Otherwise.
2303  *
2304  * @throws an exception of type regex_error.
2305  */
2306  template<typename _Ch_type, class _Rx_traits>
2307  inline bool
2308  regex_match(const _Ch_type* __s,
2312  { return regex_match(__s, __s + _Rx_traits::length(__s), __re, __f); }
2313 
2314  /**
2315  * @brief Indicates if there is a match between the regular expression @p e
2316  * and a string.
2317  *
2318  * @param __s [IN] The string to match.
2319  * @param __re [IN] The regular expression.
2320  * @param __flags [IN] Controls how the regular expression is matched.
2321  *
2322  * @retval true A match exists.
2323  * @retval false Otherwise.
2324  *
2325  * @throws an exception of type regex_error.
2326  */
2327  template<typename _Ch_traits, typename _Str_allocator,
2328  typename _Ch_type, typename _Rx_traits>
2329  inline bool
2334  { return regex_match(__s.begin(), __s.end(), __re, __flags); }
2335 
2336  // [7.11.3] Function template regex_search
2337  /**
2338  * Searches for a regular expression within a range.
2339  * @param __s [IN] The start of the string to search.
2340  * @param __e [IN] One-past-the-end of the string to search.
2341  * @param __m [OUT] The match results.
2342  * @param __re [IN] The regular expression to search for.
2343  * @param __flags [IN] Search policy flags.
2344  * @retval true A match was found within the string.
2345  * @retval false No match was found within the string, the content of %m is
2346  * undefined.
2347  *
2348  * @throws an exception of type regex_error.
2349  */
2350  template<typename _Bi_iter, typename _Alloc,
2351  typename _Ch_type, typename _Rx_traits>
2352  inline bool
2353  regex_search(_Bi_iter __s, _Bi_iter __e,
2358  {
2359  return __detail::__regex_algo_impl<_Bi_iter, _Alloc, _Ch_type, _Rx_traits,
2360  __detail::_RegexExecutorPolicy::_S_auto, false>
2361  (__s, __e, __m, __re, __flags);
2362  }
2363 
2364  /**
2365  * Searches for a regular expression within a range.
2366  * @param __first [IN] The start of the string to search.
2367  * @param __last [IN] One-past-the-end of the string to search.
2368  * @param __re [IN] The regular expression to search for.
2369  * @param __flags [IN] Search policy flags.
2370  * @retval true A match was found within the string.
2371  * @retval false No match was found within the string.
2372  *
2373  * @throws an exception of type regex_error.
2374  */
2375  template<typename _Bi_iter, typename _Ch_type, typename _Rx_traits>
2376  inline bool
2377  regex_search(_Bi_iter __first, _Bi_iter __last,
2381  {
2382  match_results<_Bi_iter> __what;
2383  return regex_search(__first, __last, __what, __re, __flags);
2384  }
2385 
2386  /**
2387  * @brief Searches for a regular expression within a C-string.
2388  * @param __s [IN] A C-string to search for the regex.
2389  * @param __m [OUT] The set of regex matches.
2390  * @param __e [IN] The regex to search for in @p s.
2391  * @param __f [IN] The search flags.
2392  * @retval true A match was found within the string.
2393  * @retval false No match was found within the string, the content of %m is
2394  * undefined.
2395  *
2396  * @throws an exception of type regex_error.
2397  */
2398  template<typename _Ch_type, class _Alloc, class _Rx_traits>
2399  inline bool
2400  regex_search(const _Ch_type* __s,
2405  { return regex_search(__s, __s + _Rx_traits::length(__s), __m, __e, __f); }
2406 
2407  /**
2408  * @brief Searches for a regular expression within a C-string.
2409  * @param __s [IN] The C-string to search.
2410  * @param __e [IN] The regular expression to search for.
2411  * @param __f [IN] Search policy flags.
2412  * @retval true A match was found within the string.
2413  * @retval false No match was found within the string.
2414  *
2415  * @throws an exception of type regex_error.
2416  */
2417  template<typename _Ch_type, typename _Rx_traits>
2418  inline bool
2419  regex_search(const _Ch_type* __s,
2423  { return regex_search(__s, __s + _Rx_traits::length(__s), __e, __f); }
2424 
2425  /**
2426  * @brief Searches for a regular expression within a string.
2427  * @param __s [IN] The string to search.
2428  * @param __e [IN] The regular expression to search for.
2429  * @param __flags [IN] Search policy flags.
2430  * @retval true A match was found within the string.
2431  * @retval false No match was found within the string.
2432  *
2433  * @throws an exception of type regex_error.
2434  */
2435  template<typename _Ch_traits, typename _String_allocator,
2436  typename _Ch_type, typename _Rx_traits>
2437  inline bool
2438  regex_search(const basic_string<_Ch_type, _Ch_traits,
2439  _String_allocator>& __s,
2443  { return regex_search(__s.begin(), __s.end(), __e, __flags); }
2444 
2445  /**
2446  * @brief Searches for a regular expression within a string.
2447  * @param __s [IN] A C++ string to search for the regex.
2448  * @param __m [OUT] The set of regex matches.
2449  * @param __e [IN] The regex to search for in @p s.
2450  * @param __f [IN] The search flags.
2451  * @retval true A match was found within the string.
2452  * @retval false No match was found within the string, the content of %m is
2453  * undefined.
2454  *
2455  * @throws an exception of type regex_error.
2456  */
2457  template<typename _Ch_traits, typename _Ch_alloc,
2458  typename _Alloc, typename _Ch_type,
2459  typename _Rx_traits>
2460  inline bool
2462  match_results<typename basic_string<_Ch_type,
2463  _Ch_traits, _Ch_alloc>::const_iterator, _Alloc>& __m,
2467  { return regex_search(__s.begin(), __s.end(), __m, __e, __f); }
2468 
2469  // _GLIBCXX_RESOLVE_LIB_DEFECTS
2470  // 2329. regex_search() with match_results should forbid temporary strings
2471  /// Prevent unsafe attempts to get match_results from a temporary string.
2472  template<typename _Ch_traits, typename _Ch_alloc,
2473  typename _Alloc, typename _Ch_type,
2474  typename _Rx_traits>
2475  bool
2477  match_results<typename basic_string<_Ch_type,
2478  _Ch_traits, _Ch_alloc>::const_iterator, _Alloc>&,
2481  = regex_constants::match_default) = delete;
2482 
2483  // std [28.11.4] Function template regex_replace
2484 
2485  template<typename _Out_iter, typename _Bi_iter,
2486  typename _Rx_traits, typename _Ch_type>
2487  _Out_iter
2488  __regex_replace(_Out_iter __out, _Bi_iter __first, _Bi_iter __last,
2490  const _Ch_type* __fmt, size_t __len,
2492 
2493  /**
2494  * @brief Search for a regular expression within a range for multiple times,
2495  and replace the matched parts through filling a format string.
2496  * @param __out [OUT] The output iterator.
2497  * @param __first [IN] The start of the string to search.
2498  * @param __last [IN] One-past-the-end of the string to search.
2499  * @param __e [IN] The regular expression to search for.
2500  * @param __fmt [IN] The format string.
2501  * @param __flags [IN] Search and replace policy flags.
2502  *
2503  * @returns __out
2504  * @throws an exception of type regex_error.
2505  */
2506  template<typename _Out_iter, typename _Bi_iter,
2507  typename _Rx_traits, typename _Ch_type,
2508  typename _St, typename _Sa>
2509  inline _Out_iter
2510  regex_replace(_Out_iter __out, _Bi_iter __first, _Bi_iter __last,
2512  const basic_string<_Ch_type, _St, _Sa>& __fmt,
2515  {
2516  return std::__regex_replace(__out, __first, __last, __e, __fmt.c_str(),
2517  __fmt.length(), __flags);
2518  }
2519 
2520  /**
2521  * @brief Search for a regular expression within a range for multiple times,
2522  and replace the matched parts through filling a format C-string.
2523  * @param __out [OUT] The output iterator.
2524  * @param __first [IN] The start of the string to search.
2525  * @param __last [IN] One-past-the-end of the string to search.
2526  * @param __e [IN] The regular expression to search for.
2527  * @param __fmt [IN] The format C-string.
2528  * @param __flags [IN] Search and replace policy flags.
2529  *
2530  * @returns __out
2531  * @throws an exception of type regex_error.
2532  */
2533  template<typename _Out_iter, typename _Bi_iter,
2534  typename _Rx_traits, typename _Ch_type>
2535  _Out_iter
2536  regex_replace(_Out_iter __out, _Bi_iter __first, _Bi_iter __last,
2538  const _Ch_type* __fmt,
2541  {
2542  return std::__regex_replace(__out, __first, __last, __e, __fmt,
2544  __flags);
2545  }
2546 
2547 
2548  /**
2549  * @brief Search for a regular expression within a string for multiple times,
2550  and replace the matched parts through filling a format string.
2551  * @param __s [IN] The string to search and replace.
2552  * @param __e [IN] The regular expression to search for.
2553  * @param __fmt [IN] The format string.
2554  * @param __flags [IN] Search and replace policy flags.
2555  *
2556  * @returns The string after replacing.
2557  * @throws an exception of type regex_error.
2558  */
2559  template<typename _Rx_traits, typename _Ch_type,
2560  typename _St, typename _Sa, typename _Fst, typename _Fsa>
2561  inline basic_string<_Ch_type, _St, _Sa>
2567  {
2570  __s.begin(), __s.end(), __e, __fmt, __flags);
2571  return __result;
2572  }
2573 
2574  /**
2575  * @brief Search for a regular expression within a string for multiple times,
2576  and replace the matched parts through filling a format C-string.
2577  * @param __s [IN] The string to search and replace.
2578  * @param __e [IN] The regular expression to search for.
2579  * @param __fmt [IN] The format C-string.
2580  * @param __flags [IN] Search and replace policy flags.
2581  *
2582  * @returns The string after replacing.
2583  * @throws an exception of type regex_error.
2584  */
2585  template<typename _Rx_traits, typename _Ch_type,
2586  typename _St, typename _Sa>
2587  inline basic_string<_Ch_type, _St, _Sa>
2590  const _Ch_type* __fmt,
2593  {
2596  __s.begin(), __s.end(), __e, __fmt, __flags);
2597  return __result;
2598  }
2599 
2600  /**
2601  * @brief Search for a regular expression within a C-string for multiple
2602  times, and replace the matched parts through filling a format string.
2603  * @param __s [IN] The C-string to search and replace.
2604  * @param __e [IN] The regular expression to search for.
2605  * @param __fmt [IN] The format string.
2606  * @param __flags [IN] Search and replace policy flags.
2607  *
2608  * @returns The string after replacing.
2609  * @throws an exception of type regex_error.
2610  */
2611  template<typename _Rx_traits, typename _Ch_type,
2612  typename _St, typename _Sa>
2613  inline basic_string<_Ch_type>
2614  regex_replace(const _Ch_type* __s,
2616  const basic_string<_Ch_type, _St, _Sa>& __fmt,
2619  {
2620  basic_string<_Ch_type> __result;
2621  regex_replace(std::back_inserter(__result), __s,
2622  __s + char_traits<_Ch_type>::length(__s),
2623  __e, __fmt, __flags);
2624  return __result;
2625  }
2626 
2627  /**
2628  * @brief Search for a regular expression within a C-string for multiple
2629  times, and replace the matched parts through filling a format C-string.
2630  * @param __s [IN] The C-string to search and replace.
2631  * @param __e [IN] The regular expression to search for.
2632  * @param __fmt [IN] The format C-string.
2633  * @param __flags [IN] Search and replace policy flags.
2634  *
2635  * @returns The string after replacing.
2636  * @throws an exception of type regex_error.
2637  */
2638  template<typename _Rx_traits, typename _Ch_type>
2639  inline basic_string<_Ch_type>
2640  regex_replace(const _Ch_type* __s,
2642  const _Ch_type* __fmt,
2645  {
2646  basic_string<_Ch_type> __result;
2647  regex_replace(std::back_inserter(__result), __s,
2648  __s + char_traits<_Ch_type>::length(__s),
2649  __e, __fmt, __flags);
2650  return __result;
2651  }
2652 
2653  ///@}
2654 
2655 _GLIBCXX_BEGIN_NAMESPACE_CXX11
2656 
2657  // std [28.12] Class template regex_iterator
2658  /**
2659  * An iterator adaptor that will provide repeated calls of regex_search over
2660  * a range until no more matches remain.
2661  */
2662  template<typename _Bi_iter,
2663  typename _Ch_type = typename iterator_traits<_Bi_iter>::value_type,
2664  typename _Rx_traits = regex_traits<_Ch_type> >
2666  {
2667  public:
2669  typedef match_results<_Bi_iter> value_type;
2670  typedef std::ptrdiff_t difference_type;
2671  typedef const value_type* pointer;
2672  typedef const value_type& reference;
2674 
2675  /**
2676  * @brief Provides a singular iterator, useful for indicating
2677  * one-past-the-end of a range.
2678  */
2679  regex_iterator() = default;
2680 
2681  /**
2682  * Constructs a %regex_iterator...
2683  * @param __a [IN] The start of a text range to search.
2684  * @param __b [IN] One-past-the-end of the text range to search.
2685  * @param __re [IN] The regular expression to match.
2686  * @param __m [IN] Policy flags for match rules.
2687  */
2688  regex_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type& __re,
2691  : _M_begin(__a), _M_end(__b), _M_pregex(&__re), _M_flags(__m), _M_match()
2692  {
2693  if (!regex_search(_M_begin, _M_end, _M_match, *_M_pregex, _M_flags))
2694  *this = regex_iterator();
2695  }
2696 
2697  // _GLIBCXX_RESOLVE_LIB_DEFECTS
2698  // 2332. regex_iterator should forbid temporary regexes
2699  regex_iterator(_Bi_iter, _Bi_iter, const regex_type&&,
2701  = regex_constants::match_default) = delete;
2702 
2703  /// Copy constructs a %regex_iterator.
2704  regex_iterator(const regex_iterator&) = default;
2705 
2706  /// Copy assigns one %regex_iterator to another.
2708  operator=(const regex_iterator&) = default;
2709 
2710  ~regex_iterator() = default;
2711 
2712  /**
2713  * @brief Tests the equivalence of two regex iterators.
2714  */
2715  bool
2716  operator==(const regex_iterator&) const noexcept;
2717 
2718  /**
2719  * @brief Tests the inequivalence of two regex iterators.
2720  */
2721  bool
2722  operator!=(const regex_iterator& __rhs) const noexcept
2723  { return !(*this == __rhs); }
2724 
2725  /**
2726  * @brief Dereferences a %regex_iterator.
2727  */
2728  const value_type&
2729  operator*() const noexcept
2730  { return _M_match; }
2731 
2732  /**
2733  * @brief Selects a %regex_iterator member.
2734  */
2735  const value_type*
2736  operator->() const noexcept
2737  { return &_M_match; }
2738 
2739  /**
2740  * @brief Increments a %regex_iterator.
2741  */
2744 
2745  /**
2746  * @brief Postincrements a %regex_iterator.
2747  */
2750  {
2751  auto __tmp = *this;
2752  ++(*this);
2753  return __tmp;
2754  }
2755 
2756  private:
2757  _Bi_iter _M_begin {};
2758  _Bi_iter _M_end {};
2759  const regex_type* _M_pregex = nullptr;
2761  match_results<_Bi_iter> _M_match;
2762  };
2763 
2764  typedef regex_iterator<const char*> cregex_iterator;
2765  typedef regex_iterator<string::const_iterator> sregex_iterator;
2766 #ifdef _GLIBCXX_USE_WCHAR_T
2767  typedef regex_iterator<const wchar_t*> wcregex_iterator;
2768  typedef regex_iterator<wstring::const_iterator> wsregex_iterator;
2769 #endif
2770 
2771  // [7.12.2] Class template regex_token_iterator
2772  /**
2773  * Iterates over submatches in a range (or @a splits a text string).
2774  *
2775  * The purpose of this iterator is to enumerate all, or all specified,
2776  * matches of a regular expression within a text range. The dereferenced
2777  * value of an iterator of this class is a std::sub_match object.
2778  */
2779  template<typename _Bi_iter,
2780  typename _Ch_type = typename iterator_traits<_Bi_iter>::value_type,
2781  typename _Rx_traits = regex_traits<_Ch_type> >
2783  {
2784  public:
2787  typedef std::ptrdiff_t difference_type;
2788  typedef const value_type* pointer;
2789  typedef const value_type& reference;
2791 
2792  public:
2793  /**
2794  * @brief Default constructs a %regex_token_iterator.
2795  *
2796  * A default-constructed %regex_token_iterator is a singular iterator
2797  * that will compare equal to the one-past-the-end value for any
2798  * iterator of the same type.
2799  */
2801  : _M_position(), _M_subs(), _M_suffix(), _M_n(0), _M_result(nullptr),
2802  _M_has_m1(false)
2803  { }
2804 
2805  /**
2806  * Constructs a %regex_token_iterator...
2807  * @param __a [IN] The start of the text to search.
2808  * @param __b [IN] One-past-the-end of the text to search.
2809  * @param __re [IN] The regular expression to search for.
2810  * @param __submatch [IN] Which submatch to return. There are some
2811  * special values for this parameter:
2812  * - -1 each enumerated subexpression does NOT
2813  * match the regular expression (aka field
2814  * splitting)
2815  * - 0 the entire string matching the
2816  * subexpression is returned for each match
2817  * within the text.
2818  * - >0 enumerates only the indicated
2819  * subexpression from a match within the text.
2820  * @param __m [IN] Policy flags for match rules.
2821  */
2822  regex_token_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type& __re,
2823  int __submatch = 0,
2826  : _M_position(__a, __b, __re, __m), _M_subs(1, __submatch), _M_n(0)
2827  { _M_init(__a, __b); }
2828 
2829  /**
2830  * Constructs a %regex_token_iterator...
2831  * @param __a [IN] The start of the text to search.
2832  * @param __b [IN] One-past-the-end of the text to search.
2833  * @param __re [IN] The regular expression to search for.
2834  * @param __submatches [IN] A list of subexpressions to return for each
2835  * regular expression match within the text.
2836  * @param __m [IN] Policy flags for match rules.
2837  */
2838  regex_token_iterator(_Bi_iter __a, _Bi_iter __b,
2839  const regex_type& __re,
2840  const std::vector<int>& __submatches,
2843  : _M_position(__a, __b, __re, __m), _M_subs(__submatches), _M_n(0)
2844  { _M_init(__a, __b); }
2845 
2846  /**
2847  * Constructs a %regex_token_iterator...
2848  * @param __a [IN] The start of the text to search.
2849  * @param __b [IN] One-past-the-end of the text to search.
2850  * @param __re [IN] The regular expression to search for.
2851  * @param __submatches [IN] A list of subexpressions to return for each
2852  * regular expression match within the text.
2853  * @param __m [IN] Policy flags for match rules.
2854  */
2855  regex_token_iterator(_Bi_iter __a, _Bi_iter __b,
2856  const regex_type& __re,
2857  initializer_list<int> __submatches,
2860  : _M_position(__a, __b, __re, __m), _M_subs(__submatches), _M_n(0)
2861  { _M_init(__a, __b); }
2862 
2863  /**
2864  * Constructs a %regex_token_iterator...
2865  * @param __a [IN] The start of the text to search.
2866  * @param __b [IN] One-past-the-end of the text to search.
2867  * @param __re [IN] The regular expression to search for.
2868  * @param __submatches [IN] A list of subexpressions to return for each
2869  * regular expression match within the text.
2870  * @param __m [IN] Policy flags for match rules.
2871  */
2872  template<std::size_t _Nm>
2873  regex_token_iterator(_Bi_iter __a, _Bi_iter __b,
2874  const regex_type& __re,
2875  const int (&__submatches)[_Nm],
2878  : _M_position(__a, __b, __re, __m),
2879  _M_subs(__submatches, __submatches + _Nm), _M_n(0)
2880  { _M_init(__a, __b); }
2881 
2882  // _GLIBCXX_RESOLVE_LIB_DEFECTS
2883  // 2332. regex_token_iterator should forbid temporary regexes
2884  regex_token_iterator(_Bi_iter, _Bi_iter, const regex_type&&, int = 0,
2887  regex_token_iterator(_Bi_iter, _Bi_iter, const regex_type&&,
2888  const std::vector<int>&,
2891  regex_token_iterator(_Bi_iter, _Bi_iter, const regex_type&&,
2895  template <std::size_t _Nm>
2896  regex_token_iterator(_Bi_iter, _Bi_iter, const regex_type&&,
2897  const int (&)[_Nm],
2900 
2901  /**
2902  * @brief Copy constructs a %regex_token_iterator.
2903  * @param __rhs [IN] A %regex_token_iterator to copy.
2904  */
2906  : _M_position(__rhs._M_position), _M_subs(__rhs._M_subs),
2907  _M_suffix(__rhs._M_suffix), _M_n(__rhs._M_n), _M_has_m1(__rhs._M_has_m1)
2908  { _M_normalize_result(); }
2909 
2910  /**
2911  * @brief Assigns a %regex_token_iterator to another.
2912  * @param __rhs [IN] A %regex_token_iterator to copy.
2913  */
2916 
2917  /**
2918  * @brief Compares a %regex_token_iterator to another for equality.
2919  */
2920  bool
2921  operator==(const regex_token_iterator& __rhs) const;
2922 
2923  /**
2924  * @brief Compares a %regex_token_iterator to another for inequality.
2925  */
2926  bool
2927  operator!=(const regex_token_iterator& __rhs) const
2928  { return !(*this == __rhs); }
2929 
2930  /**
2931  * @brief Dereferences a %regex_token_iterator.
2932  */
2933  const value_type&
2934  operator*() const
2935  { return *_M_result; }
2936 
2937  /**
2938  * @brief Selects a %regex_token_iterator member.
2939  */
2940  const value_type*
2941  operator->() const
2942  { return _M_result; }
2943 
2944  /**
2945  * @brief Increments a %regex_token_iterator.
2946  */
2949 
2950  /**
2951  * @brief Postincrements a %regex_token_iterator.
2952  */
2955  {
2956  auto __tmp = *this;
2957  ++(*this);
2958  return __tmp;
2959  }
2960 
2961  private:
2963 
2964  void
2965  _M_init(_Bi_iter __a, _Bi_iter __b);
2966 
2967  const value_type&
2968  _M_current_match() const
2969  {
2970  if (_M_subs[_M_n] == -1)
2971  return (*_M_position).prefix();
2972  else
2973  return (*_M_position)[_M_subs[_M_n]];
2974  }
2975 
2976  constexpr bool
2977  _M_end_of_seq() const
2978  { return _M_result == nullptr; }
2979 
2980  // [28.12.2.2.4]
2981  void
2982  _M_normalize_result()
2983  {
2984  if (_M_position != _Position())
2985  _M_result = &_M_current_match();
2986  else if (_M_has_m1)
2987  _M_result = &_M_suffix;
2988  else
2989  _M_result = nullptr;
2990  }
2991 
2992  _Position _M_position;
2993  std::vector<int> _M_subs;
2994  value_type _M_suffix;
2995  std::size_t _M_n;
2996  const value_type* _M_result;
2997 
2998  // Show whether _M_subs contains -1
2999  bool _M_has_m1;
3000  };
3001 
3002  /** @brief Token iterator for C-style NULL-terminated strings. */
3004 
3005  /** @brief Token iterator for standard strings. */
3007 
3008 #ifdef _GLIBCXX_USE_WCHAR_T
3009  /** @brief Token iterator for C-style NULL-terminated wide strings. */
3011 
3012  /** @brief Token iterator for standard wide-character strings. */
3014 #endif
3015 
3016  ///@} // group regex
3017 
3018 _GLIBCXX_END_NAMESPACE_CXX11
3019 _GLIBCXX_END_NAMESPACE_VERSION
3020 } // namespace
3021 
3022 #include <bits/regex.tcc>
integral_constant< bool, true > true_type
The type used as a compile-time boolean with true value.
Definition: type_traits:83
integral_constant< bool, false > false_type
The type used as a compile-time boolean with false value.
Definition: type_traits:86
constexpr _Tp * __addressof(_Tp &__r) noexcept
Same as C++11 std::addressof.
Definition: move.h:49
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
Definition: move.h:104
void swap(any &__x, any &__y) noexcept
Exchange the states of two any objects.
Definition: any:428
constexpr const _Tp & min(const _Tp &, const _Tp &)
This does what you think it does.
Definition: stl_algobase.h:230
bool operator>=(typename iterator_traits< _Bi_iter >::value_type const &__lhs, const sub_match< _Bi_iter > &__rhs)
Tests the ordering of a character and a regular expression submatch.
Definition: regex.h:1542
_Out_iter __regex_replace(_Out_iter __out, _Bi_iter __first, _Bi_iter __last, const basic_regex< _Ch_type, _Rx_traits > &__e, const _Ch_type *__fmt, size_t __len, regex_constants::match_flag_type __flags)
Determines if there is a match between the regular expression e and all of the character sequence [fi...
sub_match< wstring::const_iterator > wssub_match
Regex submatch over a standard wide string.
Definition: regex.h:1044
bool operator!=(const sub_match< _Bi_iter > &__lhs, typename iterator_traits< _Bi_iter >::value_type const &__rhs)
Tests the inequivalence of a regular expression submatch and a character.
Definition: regex.h:1603
sub_match< string::const_iterator > ssub_match
Standard regex submatch over a standard string.
Definition: regex.h:1037
bool operator==(const __sub_match_string< _Bi_iter, _Ch_traits, _Ch_alloc > &__lhs, const sub_match< _Bi_iter > &__rhs)
Tests the equivalence of a string and a regular expression submatch.
Definition: regex.h:1155
bool operator!=(const __sub_match_string< _Bi_iter, _Ch_traits, _Ch_alloc > &__lhs, const sub_match< _Bi_iter > &__rhs)
Tests the inequivalence of a string and a regular expression submatch.
Definition: regex.h:1168
sub_match< const char * > csub_match
Standard regex submatch over a C-style null-terminated string.
Definition: regex.h:1034
regex_token_iterator< const char * > cregex_token_iterator
Token iterator for C-style NULL-terminated strings.
Definition: regex.h:3003
bool operator==(const sub_match< _Bi_iter > &__lhs, const __sub_match_string< _Bi_iter, _Ch_traits, _Ch_alloc > &__rhs)
Tests the equivalence of a regular expression submatch and a string.
Definition: regex.h:1230
bool operator>=(const __sub_match_string< _Bi_iter, _Ch_traits, _Ch_alloc > &__lhs, const sub_match< _Bi_iter > &__rhs)
Tests the ordering of a string and a regular expression submatch.
Definition: regex.h:1204
regex_token_iterator< wstring::const_iterator > wsregex_token_iterator
Token iterator for standard wide-character strings.
Definition: regex.h:3013
bool operator==(const sub_match< _Bi_iter > &__lhs, typename iterator_traits< _Bi_iter >::value_type const &__rhs)
Tests the equivalence of a regular expression submatch and a character.
Definition: regex.h:1569
bool operator>=(const sub_match< _Bi_iter > &__lhs, typename iterator_traits< _Bi_iter >::value_type const *__rhs)
Tests the ordering of a regular expression submatch and a C string.
Definition: regex.h:1465
bool operator==(const sub_match< _Bi_iter > &__lhs, typename iterator_traits< _Bi_iter >::value_type const *__rhs)
Tests the equivalence of a regular expression submatch and a C string.
Definition: regex.h:1397
bool operator!=(const sub_match< _Bi_iter > &__lhs, typename iterator_traits< _Bi_iter >::value_type const *__rhs)
Tests the inequivalence of a regular expression submatch and a string.
Definition: regex.h:1429
bool operator!=(typename iterator_traits< _Bi_iter >::value_type const *__lhs, const sub_match< _Bi_iter > &__rhs)
Tests the inequivalence of a C string and a regular expression submatch.
Definition: regex.h:1335
regex_token_iterator< const wchar_t * > wcregex_token_iterator
Token iterator for C-style NULL-terminated wide strings.
Definition: regex.h:3010
void swap(basic_regex< _Ch_type, _Rx_traits > &__lhs, basic_regex< _Ch_type, _Rx_traits > &__rhs) noexcept
Swaps the contents of two regular expression objects.
Definition: regex.h:872
bool operator>(const sub_match< _Bi_iter > &__lhs, typename iterator_traits< _Bi_iter >::value_type const &__rhs)
Tests the ordering of a regular expression submatch and a character.
Definition: regex.h:1629
bool operator>(const sub_match< _Bi_iter > &__lhs, typename iterator_traits< _Bi_iter >::value_type const *__rhs)
Tests the ordering of a regular expression submatch and a C string.
Definition: regex.h:1453
bool operator>=(const sub_match< _Bi_iter > &__lhs, typename iterator_traits< _Bi_iter >::value_type const &__rhs)
Tests the ordering of a regular expression submatch and a character.
Definition: regex.h:1642
bool operator>(typename iterator_traits< _Bi_iter >::value_type const &__lhs, const sub_match< _Bi_iter > &__rhs)
Tests the ordering of a character and a regular expression submatch.
Definition: regex.h:1529
basic_regex< char > regex
Standard regular expressions.
Definition: regex.h:855
_Out_iter regex_replace(_Out_iter __out, _Bi_iter __first, _Bi_iter __last, const basic_regex< _Ch_type, _Rx_traits > &__e, const basic_string< _Ch_type, _St, _Sa > &__fmt, regex_constants::match_flag_type __flags=regex_constants::match_default)
Search for a regular expression within a range for multiple times, and replace the matched parts thro...
Definition: regex.h:2510
sub_match< const wchar_t * > wcsub_match
Regex submatch over a C-style null-terminated wide string.
Definition: regex.h:1041
regex_token_iterator< string::const_iterator > sregex_token_iterator
Token iterator for standard strings.
Definition: regex.h:3006
bool operator>=(const sub_match< _Bi_iter > &__lhs, const __sub_match_string< _Bi_iter, _Ch_traits, _Ch_alloc > &__rhs)
Tests the ordering of a regular expression submatch and a string.
Definition: regex.h:1297
bool regex_match(_Bi_iter __s, _Bi_iter __e, match_results< _Bi_iter, _Alloc > &__m, const basic_regex< _Ch_type, _Rx_traits > &__re, regex_constants::match_flag_type __flags=regex_constants::match_default)
Determines if there is a match between the regular expression e and all of the character sequence [fi...
Definition: regex.h:2195
bool operator==(const match_results< _Bi_iter, _Alloc > &__m1, const match_results< _Bi_iter, _Alloc > &__m2)
Compares two match_results for equality.
Definition: regex.h:2125
bool operator!=(const match_results< _Bi_iter, _Alloc > &__m1, const match_results< _Bi_iter, _Alloc > &__m2)
Compares two match_results for inequality.
Definition: regex.h:2150
bool regex_search(_Bi_iter __s, _Bi_iter __e, match_results< _Bi_iter, _Alloc > &__m, const basic_regex< _Ch_type, _Rx_traits > &__re, regex_constants::match_flag_type __flags=regex_constants::match_default)
Definition: regex.h:2353
bool operator>(const sub_match< _Bi_iter > &__lhs, const __sub_match_string< _Bi_iter, _Ch_traits, _Ch_alloc > &__rhs)
Tests the ordering of a regular expression submatch and a string.
Definition: regex.h:1285
bool operator>(typename iterator_traits< _Bi_iter >::value_type const *__lhs, const sub_match< _Bi_iter > &__rhs)
Tests the ordering of a C string and a regular expression submatch.
Definition: regex.h:1359
bool operator>=(const sub_match< _BiIter > &__lhs, const sub_match< _BiIter > &__rhs)
Tests the ordering of two regular expression submatches.
Definition: regex.h:1121
bool operator>(const sub_match< _BiIter > &__lhs, const sub_match< _BiIter > &__rhs)
Tests the ordering of two regular expression submatches.
Definition: regex.h:1132
bool operator==(typename iterator_traits< _Bi_iter >::value_type const &__lhs, const sub_match< _Bi_iter > &__rhs)
Tests the equivalence of a character and a regular expression submatch.
Definition: regex.h:1490
bool operator>(const __sub_match_string< _Bi_iter, _Ch_traits, _Ch_alloc > &__lhs, const sub_match< _Bi_iter > &__rhs)
Tests the ordering of a string and a regular expression submatch.
Definition: regex.h:1192
bool operator!=(typename iterator_traits< _Bi_iter >::value_type const &__lhs, const sub_match< _Bi_iter > &__rhs)
Tests the inequivalence of a character and a regular expression submatch.
Definition: regex.h:1503
basic_regex< wchar_t > wregex
Standard wide-character regular expressions.
Definition: regex.h:859
bool operator==(typename iterator_traits< _Bi_iter >::value_type const *__lhs, const sub_match< _Bi_iter > &__rhs)
Tests the equivalence of a C string and a regular expression submatch.
Definition: regex.h:1322
bool operator==(const sub_match< _BiIter > &__lhs, const sub_match< _BiIter > &__rhs)
Tests the equivalence of two regular expression submatches.
Definition: regex.h:1059
bool operator!=(const sub_match< _BiIter > &__lhs, const sub_match< _BiIter > &__rhs)
Tests the inequivalence of two regular expression submatches.
Definition: regex.h:1088
bool operator!=(const sub_match< _Bi_iter > &__lhs, const __sub_match_string< _Bi_iter, _Ch_traits, _Ch_alloc > &__rhs)
Tests the inequivalence of a regular expression submatch and a string.
Definition: regex.h:1261
bool operator>=(typename iterator_traits< _Bi_iter >::value_type const *__lhs, const sub_match< _Bi_iter > &__rhs)
Tests the ordering of a C string and a regular expression submatch.
Definition: regex.h:1371
constexpr back_insert_iterator< _Container > back_inserter(_Container &__x)
ISO C++ entities toplevel namespace is std.
bitset< _Nb > operator^(const bitset< _Nb > &__x, const bitset< _Nb > &__y) noexcept
Global bitwise operations on bitsets.
Definition: bitset:1453
constexpr iterator_traits< _InputIterator >::difference_type distance(_InputIterator __first, _InputIterator __last)
A generalization of pointer arithmetic.
std::basic_ostream< _CharT, _Traits > & operator<<(std::basic_ostream< _CharT, _Traits > &__os, const bitset< _Nb > &__x)
Global I/O operators for bitsets.
Definition: bitset:1540
bitset< _Nb > operator|(const bitset< _Nb > &__x, const bitset< _Nb > &__y) noexcept
Global bitwise operations on bitsets.
Definition: bitset:1444
bitset< _Nb > operator&(const bitset< _Nb > &__x, const bitset< _Nb > &__y) noexcept
Global bitwise operations on bitsets.
Definition: bitset:1435
GNU extensions for public use.
__numeric_traits_integer< _Tp > __int_traits
Convenience alias for __numeric_traits<integer-type>.
constexpr syntax_option_type collate
constexpr syntax_option_type ECMAScript
constexpr syntax_option_type egrep
syntax_option_type
This is a bitmask type indicating how to interpret the regex.
constexpr syntax_option_type multiline
constexpr match_flag_type match_default
constexpr syntax_option_type awk
constexpr syntax_option_type extended
constexpr syntax_option_type basic
match_flag_type
This is a bitmask type indicating regex matching rules.
constexpr syntax_option_type icase
constexpr syntax_option_type optimize
constexpr match_flag_type format_default
constexpr syntax_option_type nosubs
constexpr syntax_option_type grep
constexpr _Iterator __base(_Iterator __it)
initializer_list
is_same
Definition: type_traits:1410
typename _Size< _Alloc, difference_type >::type size_type
The allocator's size type.
Managing sequences of characters and character-like objects.
const _CharT * c_str() const noexcept
Return const pointer to null-terminated contents.
size_type length() const noexcept
Returns the number of characters in the string, not including any null-termination.
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.
Basis for explicit traits specializations.
Definition: char_traits.h:339
Traits class for iterators.
Container class for localization functionality.
Facet for localized string comparison.
Primary class template ctype facet.
locale_type getloc() const noexcept
Gets the locale currently imbued in the regular expression object.
Definition: regex.h:755
basic_regex & assign(const basic_string< _Ch_type, _Ch_traits, _Alloc > &__s, flag_type __flags=ECMAScript)
Assigns a new regular expression to a regex object from a string containing a regular expression patt...
Definition: regex.h:657
basic_regex & assign(basic_regex &&__rhs) noexcept
Move-assigns one regular expression to another.
Definition: regex.h:599
unsigned int mark_count() const noexcept
Gets the number of marked subexpressions within the regular expression.
Definition: regex.h:721
basic_regex & assign(initializer_list< _Ch_type > __l, flag_type __flags=ECMAScript)
Assigns a new regular expression to a regex object.
Definition: regex.h:709
locale_type imbue(locale_type __loc)
Imbues the regular expression object with the given locale.
Definition: regex.h:743
basic_regex(const basic_regex &__rhs)=default
Copy-constructs a basic regular expression.
flag_type flags() const noexcept
Gets the flags used to construct the regular expression or in the last call to assign().
Definition: regex.h:733
basic_regex & operator=(const basic_string< _Ch_type, _Ch_traits, _Alloc > &__s)
Replaces a regular expression with a new one constructed from a string.
Definition: regex.h:580
basic_regex(const _Ch_type *__p, flag_type __f=ECMAScript)
Constructs a basic regular expression from the sequence [__p, __p + char_traits<_Ch_type>::length(__p...
Definition: regex.h:453
void swap(basic_regex &__rhs) noexcept
Swaps the contents of two regular expression objects.
Definition: regex.h:765
basic_regex(const std::basic_string< _Ch_type, _Ch_traits, _Ch_alloc > &__s, flag_type __f=ECMAScript)
Constructs a basic regular expression from the string s interpreted according to the flags in f.
Definition: regex.h:497
basic_regex & operator=(const _Ch_type *__p)
Replaces a regular expression with a new one constructed from a C-style null-terminated string.
Definition: regex.h:557
basic_regex & operator=(const basic_regex &)=default
Assigns one regular expression to another.
basic_regex(_FwdIter __first, _FwdIter __last, flag_type __f=ECMAScript)
Constructs a basic regular expression from the range [first, last) interpreted according to the flags...
Definition: regex.h:516
basic_regex & assign(const basic_regex &__rhs) noexcept
Assigns one regular expression to another.
Definition: regex.h:590
basic_regex & assign(const _Ch_type *__p, flag_type __flags=ECMAScript)
Assigns a new regular expression to a regex object from a C-style null-terminated string containing a...
Definition: regex.h:616
basic_regex(const _Ch_type *__p, std::size_t __len, flag_type __f=ECMAScript)
Constructs a basic regular expression from the sequence [p, p + len) interpreted according to the fla...
Definition: regex.h:468
basic_regex & assign(_InputIterator __first, _InputIterator __last, flag_type __flags=ECMAScript)
Assigns a new regular expression to a regex object.
Definition: regex.h:679
basic_regex & operator=(basic_regex &&)=default
Move-assigns one regular expression to another.
basic_regex & assign(const _Ch_type *__p, size_t __len, flag_type __flags=ECMAScript)
Assigns a new regular expression to a regex object from a C-style string containing a regular express...
Definition: regex.h:638
basic_regex(basic_regex &&__rhs) noexcept=default
Move-constructs a basic regular expression.
basic_regex(initializer_list< _Ch_type > __l, flag_type __f=ECMAScript)
Constructs a basic regular expression from an initializer list.
Definition: regex.h:528
basic_regex() noexcept
Definition: regex.h:437
basic_regex & operator=(initializer_list< _Ch_type > __l)
Replaces a regular expression with a new one constructed from an initializer list.
Definition: regex.h:569
~basic_regex()
Destroys a basic regular expression.
Definition: regex.h:534
The results of a match or search operation.
Definition: regex.h:1703
allocator_type get_allocator() const noexcept
Gets a copy of the allocator.
Definition: regex.h:2028
void swap(match_results &__that) noexcept
Swaps the contents of two match_results.
Definition: regex.h:2042
difference_type position(size_type __sub=0) const
Gets the offset of the beginning of the indicated submatch.
Definition: regex.h:1862
size_type size() const noexcept
Gets the number of matches and submatches.
Definition: regex.h:1815
_Out_iter format(_Out_iter __out, const char_type *__fmt_first, const char_type *__fmt_last, match_flag_type __flags=regex_constants::format_default) const
difference_type length(size_type __sub=0) const
Gets the length of the indicated submatch.
Definition: regex.h:1847
const_reference prefix() const
Gets a sub_match representing the match prefix.
Definition: regex.h:1907
size_type max_size() const noexcept
Gets the number of matches and submatches.
Definition: regex.h:1819
const_reference operator[](size_type __sub) const
Gets a sub_match reference for the match or submatch.
Definition: regex.h:1890
match_results(match_results &&) noexcept=default
Move constructs a match_results.
basic_string< char_type, _St, _Sa > format(const basic_string< char_type, _St, _Sa > &__fmt, match_flag_type __flags=regex_constants::format_default) const
Definition: regex.h:1994
match_results(const _Alloc &__a) noexcept
Constructs a default match_results container.
Definition: regex.h:1759
match_results(const match_results &)=default
Copy constructs a match_results.
_Out_iter format(_Out_iter __out, const basic_string< char_type, _St, _Sa > &__fmt, match_flag_type __flags=regex_constants::format_default) const
Definition: regex.h:1982
const_iterator cbegin() const noexcept
Gets an iterator to the start of the sub_match collection.
Definition: regex.h:1939
string_type str(size_type __sub=0) const
Gets the match or submatch converted to a string type.
Definition: regex.h:1875
const_iterator end() const noexcept
Gets an iterator to one-past-the-end of the collection.
Definition: regex.h:1946
const_reference suffix() const
Gets a sub_match representing the match suffix.
Definition: regex.h:1922
bool ready() const noexcept
Indicates if the match_results is ready.
Definition: regex.h:1798
bool empty() const noexcept
Indicates if the match_results contains no results.
Definition: regex.h:1828
string_type format(const char_type *__fmt, match_flag_type __flags=regex_constants::format_default) const
Definition: regex.h:2006
match_results()
Constructs a default match_results container.
Definition: regex.h:1752
const_iterator cend() const noexcept
Gets an iterator to one-past-the-end of the collection.
Definition: regex.h:1953
const_iterator begin() const noexcept
Gets an iterator to the start of the sub_match collection.
Definition: regex.h:1932
Takes a regex and an input string and does the matching.
Describes aspects of a regular expression.
Definition: regex.h:91
char_type translate(char_type __c) const
Performs the identity translation.
Definition: regex.h:194
string_type lookup_collatename(_Fwd_iter __first, _Fwd_iter __last) const
Gets a collation element by name.
char_class_type lookup_classname(_Fwd_iter __first, _Fwd_iter __last, bool __icase=false) const
Maps one or more characters to a named character classification.
static std::size_t length(const char_type *__p)
Gives the length of a C-style string starting at __p.
Definition: regex.h:183
string_type transform_primary(_Fwd_iter __first, _Fwd_iter __last) const
Gets a sort key for a character sequence, independent of case.
Definition: regex.h:260
regex_traits()
Constructs a default traits object.
Definition: regex.h:170
int value(_Ch_type __ch, int __radix) const
Converts a digit to an int.
char_type translate_nocase(char_type __c) const
Translates a character into a case-insensitive equivalent.
Definition: regex.h:207
locale_type getloc() const
Gets a copy of the current locale in use by the regex_traits object.
Definition: regex.h:383
bool isctype(_Ch_type __c, char_class_type __f) const
Determines if c is a member of an identified class.
locale_type imbue(locale_type __loc)
Imbues the regex_traits object with a copy of a new locale.
Definition: regex.h:372
string_type transform(_Fwd_iter __first, _Fwd_iter __last) const
Gets a sort key for a character sequence.
Definition: regex.h:236
difference_type length() const noexcept
Gets the length of the matching sequence.
Definition: regex.h:907
int compare(const value_type *__s) const
Compares this sub_match to a string.
Definition: regex.h:964
string_type str() const
Gets the matching sequence as a string.
Definition: regex.h:929
int compare(const sub_match &__s) const
Compares this and another matched sequence.
Definition: regex.h:946
int compare(const string_type &__s) const
Compares this sub_match to a string.
Definition: regex.h:960
regex_iterator & operator++()
Increments a regex_iterator.
bool operator!=(const regex_iterator &__rhs) const noexcept
Tests the inequivalence of two regex iterators.
Definition: regex.h:2722
regex_iterator operator++(int)
Postincrements a regex_iterator.
Definition: regex.h:2749
regex_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type &__re, regex_constants::match_flag_type __m=regex_constants::match_default)
Definition: regex.h:2688
regex_iterator(const regex_iterator &)=default
Copy constructs a regex_iterator.
regex_iterator()=default
Provides a singular iterator, useful for indicating one-past-the-end of a range.
regex_iterator & operator=(const regex_iterator &)=default
Copy assigns one regex_iterator to another.
const value_type & operator*() const noexcept
Dereferences a regex_iterator.
Definition: regex.h:2729
const value_type * operator->() const noexcept
Selects a regex_iterator member.
Definition: regex.h:2736
bool operator==(const regex_iterator &) const noexcept
Tests the equivalence of two regex iterators.
regex_token_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type &__re, const int(&__submatches)[_Nm], regex_constants::match_flag_type __m=regex_constants::match_default)
Definition: regex.h:2873
bool operator==(const regex_token_iterator &__rhs) const
Compares a regex_token_iterator to another for equality.
const value_type & operator*() const
Dereferences a regex_token_iterator.
Definition: regex.h:2934
regex_token_iterator(const regex_token_iterator &__rhs)
Copy constructs a regex_token_iterator.
Definition: regex.h:2905
regex_token_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type &__re, const std::vector< int > &__submatches, regex_constants::match_flag_type __m=regex_constants::match_default)
Definition: regex.h:2838
regex_token_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type &__re, initializer_list< int > __submatches, regex_constants::match_flag_type __m=regex_constants::match_default)
Definition: regex.h:2855
regex_token_iterator & operator++()
Increments a regex_token_iterator.
bool operator!=(const regex_token_iterator &__rhs) const
Compares a regex_token_iterator to another for inequality.
Definition: regex.h:2927
regex_token_iterator operator++(int)
Postincrements a regex_token_iterator.
Definition: regex.h:2954
regex_token_iterator()
Default constructs a regex_token_iterator.
Definition: regex.h:2800
regex_token_iterator & operator=(const regex_token_iterator &__rhs)
Assigns a regex_token_iterator to another.
const value_type * operator->() const
Selects a regex_token_iterator member.
Definition: regex.h:2941
regex_token_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type &__re, int __submatch=0, regex_constants::match_flag_type __m=regex_constants::match_default)
Definition: regex.h:2822
A smart pointer with reference-counted copy semantics.
Forward iterators support a superset of input iterator operations.
Struct holding two objects of arbitrary type.
Definition: stl_pair.h:213
_BiIter first
The first member.
Definition: stl_pair.h:217
_BiIter second
The second member.
Definition: stl_pair.h:218
A standard container which offers fixed time access to individual elements in any order.
Definition: stl_vector.h:390
bool empty() const noexcept
Definition: stl_vector.h:1007
allocator_type get_allocator() const noexcept
Get a copy of the memory allocation object.
Definition: stl_vector.h:284
size_type max_size() const noexcept
Definition: stl_vector.h:923
void assign(size_type __n, const value_type &__val)
Assigns a given value to a vector.
Definition: stl_vector.h:749
void swap(vector &__x) noexcept
Swaps data with another vector.
Definition: stl_vector.h:1480
_Tp * data() noexcept
Definition: stl_vector.h:1168
iterator begin() noexcept
Definition: stl_vector.h:811
iterator end() noexcept
Definition: stl_vector.h:829
size_type size() const noexcept
Definition: stl_vector.h:918
reference operator[](size_type __n) noexcept
Subscript access to the data contained in the vector.
Definition: stl_vector.h:1043