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// class template regex -*- C++ -*-

// Copyright (C) 2010, 2011 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the

// terms of the GNU General Public License as published by the

// Free Software Foundation; either version 3, or (at your option)

// any later version.

// This library is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// <http://www.gnu.org/licenses/>.

/**

 *  @file bits/regex_cursor.h

 *  This is an internal header file, included by other library headers.

 *  Do not attempt to use it directly. @headername{regex}

 */

namespace std _GLIBCXX_VISIBILITY(default)

{

namespace __regex

{

_GLIBCXX_BEGIN_NAMESPACE_VERSION

  // ABC for pattern matching

  struct _PatternCursor

  {

    virtual ~_PatternCursor() { };

    virtual void _M_next() = 0;

    virtual bool _M_at_end() const = 0;

  };

  // Provides a cursor into the specific target string.

  template<typename _FwdIterT>

    class _SpecializedCursor

    : public _PatternCursor

    {

    public:

      _SpecializedCursor(const _FwdIterT& __b, const _FwdIterT __e)

      : _M_b(__b), _M_c(__b), _M_e(__e)

      { }

      typename std::iterator_traits<_FwdIterT>::value_type

      _M_current() const

      { return *_M_c; }

      void

      _M_next()

      { ++_M_c; }

      _FwdIterT

      _M_pos() const

      { return _M_c; }

      const _FwdIterT&

      _M_begin() const

      { return _M_b; }

      const _FwdIterT&

      _M_end() const

      { return _M_e; }

      bool

      _M_at_end() const

      { return _M_c == _M_e; }

    private:

      _FwdIterT _M_b;

      _FwdIterT _M_c;

      _FwdIterT _M_e;

    };

  // Helper function to create a cursor specialized for an iterator class.

  template<typename _FwdIterT>

    inline _SpecializedCursor<_FwdIterT>

    __cursor(const _FwdIterT& __b, const _FwdIterT __e)

    { return _SpecializedCursor<_FwdIterT>(__b, __e); }

_GLIBCXX_END_NAMESPACE_VERSION

} // namespace __regex

} // namespace