libstdc++-v3/include/bits/regex_cursor.h

   1 // class template regex -*- C++ -*-
   2
   3 // Copyright (C) 2010 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  * You should not attempt to use it directly.
  29  */
  30
  31 _GLIBCXX_BEGIN_NAMESPACE(std)
  32
  33 namespace __regex
  34 {
  35   // ABC for pattern matching
  36   struct _PatternCursor
  37   {
  38     virtual ~_PatternCursor() { };
  39     virtual void _M_next() = 0;
  40     virtual bool _M_at_end() const = 0;
  41   };
  42
  43   // Provides a cursor into the specific target string.
  44   template<typename _FwdIterT>
  45     class _SpecializedCursor
  46     : public _PatternCursor
  47     {
  48     public:
  49       _SpecializedCursor(const _FwdIterT& __b, const _FwdIterT __e)
  50       : _M_b(__b), _M_c(__b), _M_e(__e)
  51       { }
  52
  53       typename std::iterator_traits<_FwdIterT>::value_type
  54       _M_current() const
  55       { return *_M_c; }
  56
  57       void
  58       _M_next()
  59       { ++_M_c; }
  60
  61       _FwdIterT
  62       _M_pos() const
  63       { return _M_c; }
  64
  65       const _FwdIterT&
  66       _M_begin() const
  67       { return _M_b; }
  68
  69       const _FwdIterT&
  70       _M_end() const
  71       { return _M_e; }
  72
  73       bool
  74       _M_at_end() const
  75       { return _M_c == _M_e; }
  76
  77     private:
  78       _FwdIterT _M_b;
  79       _FwdIterT _M_c;
  80       _FwdIterT _M_e;
  81     };
  82
  83   // Helper funxtion to create a cursor specialized for an iterator class.
  84   template<typename _FwdIterT>
  85     inline _SpecializedCursor<_FwdIterT>
  86     __cursor(const _FwdIterT& __b, const _FwdIterT __e)
  87     { return _SpecializedCursor<_FwdIterT>(__b, __e); }
  88
  89 } // namespace __regex
  90
  91 _GLIBCXX_END_NAMESPACE