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  1. // class template regex -*- C++ -*-
  2.  
  3. // Copyright (C) 2010-2013 Free Software Foundation, Inc.
  4. //
  5. // This file is part of the GNU ISO C++ Library.  This library is free
  6. // software; you can redistribute it and/or modify it under the
  7. // terms of the GNU General Public License as published by the
  8. // Free Software Foundation; either version 3, or (at your option)
  9. // any later version.
  10.  
  11. // This library is distributed in the hope that it will be useful,
  12. // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14. // GNU General Public License for more details.
  15.  
  16. // Under Section 7 of GPL version 3, you are granted additional
  17. // permissions described in the GCC Runtime Library Exception, version
  18. // 3.1, as published by the Free Software Foundation.
  19.  
  20. // You should have received a copy of the GNU General Public License and
  21. // a copy of the GCC Runtime Library Exception along with this program;
  22. // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23. // <http://www.gnu.org/licenses/>.
  24.  
  25. /**
  26.  *  @file bits/regex_cursor.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. namespace __detail
  34. {
  35. _GLIBCXX_BEGIN_NAMESPACE_VERSION
  36.  
  37.   /**
  38.    *  @defgroup regex-detail Base and Implementation Classes
  39.    *  @ingroup regex
  40.    *  @{
  41.    */
  42.  
  43.   /// ABC for pattern matching
  44.   struct _PatternCursor
  45.   {
  46.     virtual ~_PatternCursor() { };
  47.     virtual void _M_next() = 0;
  48.     virtual bool _M_at_end() const = 0;
  49.   };
  50.  
  51.   /// Provides a cursor into the specific target string.
  52.   template<typename _FwdIterT>
  53.     class _SpecializedCursor
  54.     : public _PatternCursor
  55.     {
  56.     public:
  57.       _SpecializedCursor(const _FwdIterT& __b, const _FwdIterT __e)
  58.       : _M_b(__b), _M_c(__b), _M_e(__e)
  59.       { }
  60.  
  61.       typename std::iterator_traits<_FwdIterT>::value_type
  62.       _M_current() const
  63.       { return *_M_c; }
  64.  
  65.       void
  66.       _M_next()
  67.       { ++_M_c; }
  68.  
  69.       _FwdIterT
  70.       _M_pos() const
  71.       { return _M_c; }
  72.  
  73.       const _FwdIterT&
  74.       _M_begin() const
  75.       { return _M_b; }
  76.  
  77.       const _FwdIterT&
  78.       _M_end() const
  79.       { return _M_e; }
  80.  
  81.       bool
  82.       _M_at_end() const
  83.       { return _M_c == _M_e; }
  84.  
  85.     private:
  86.       _FwdIterT _M_b;
  87.       _FwdIterT _M_c;
  88.       _FwdIterT _M_e;
  89.     };
  90.  
  91.   // Helper function to create a cursor specialized for an iterator class.
  92.   template<typename _FwdIterT>
  93.     inline _SpecializedCursor<_FwdIterT>
  94.     __cursor(const _FwdIterT& __b, const _FwdIterT __e)
  95.     { return _SpecializedCursor<_FwdIterT>(__b, __e); }
  96.  
  97.  //@} regex-detail
  98. _GLIBCXX_END_NAMESPACE_VERSION
  99. } // namespace __detail
  100. } // namespace
  101.