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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