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

   1 // class template regex -*- C++ -*-
   2
   3 // Copyright (C) 2010, 2011 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 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  34
  35 namespace __regex
  36 {
  37   // ABC for pattern matching
  38   struct _PatternCursor
  39   {
  40     virtual ~_PatternCursor() { };
  41     virtual void _M_next() = 0;
  42     virtual bool _M_at_end() const = 0;
  43   };
  44
  45   // Provides a cursor into the specific target string.
  46   template<typename _FwdIterT>
  47     class _SpecializedCursor
  48     : public _PatternCursor
  49     {
  50     public:
  51       _SpecializedCursor(const _FwdIterT& __b, const _FwdIterT __e)
  52       : _M_b(__b), _M_c(__b), _M_e(__e)
  53       { }
  54
  55       typename std::iterator_traits<_FwdIterT>::value_type
  56       _M_current() const
  57       { return *_M_c; }
  58
  59       void
  60       _M_next()
  61       { ++_M_c; }
  62
  63       _FwdIterT
  64       _M_pos() const
  65       { return _M_c; }
  66
  67       const _FwdIterT&
  68       _M_begin() const
  69       { return _M_b; }
  70
  71       const _FwdIterT&
  72       _M_end() const
  73       { return _M_e; }
  74
  75       bool
  76       _M_at_end() const
  77       { return _M_c == _M_e; }
  78
  79     private:
  80       _FwdIterT _M_b;
  81       _FwdIterT _M_c;
  82       _FwdIterT _M_e;
  83     };
  84
  85   // Helper function to create a cursor specialized for an iterator class.
  86   template<typename _FwdIterT>
  87     inline _SpecializedCursor<_FwdIterT>
  88     __cursor(const _FwdIterT& __b, const _FwdIterT __e)
  89     { return _SpecializedCursor<_FwdIterT>(__b, __e); }
  90
  91 } // namespace __regex
  92
  93 _GLIBCXX_END_NAMESPACE_VERSION
  94 } // namespace