mirror of git://gcc.gnu.org/git/gcc.git
101 lines
2.7 KiB
C++
101 lines
2.7 KiB
C++
// class template regex -*- C++ -*-
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// Copyright (C) 2010, 2011, 2012 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/**
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* @file bits/regex_cursor.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{regex}
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*/
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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namespace __detail
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @defgroup regex-detail Base and Implementation Classes
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* @ingroup regex
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* @{
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*/
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/// ABC for pattern matching
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struct _PatternCursor
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{
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virtual ~_PatternCursor() { };
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virtual void _M_next() = 0;
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virtual bool _M_at_end() const = 0;
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};
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/// Provides a cursor into the specific target string.
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template<typename _FwdIterT>
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class _SpecializedCursor
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: public _PatternCursor
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{
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public:
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_SpecializedCursor(const _FwdIterT& __b, const _FwdIterT __e)
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: _M_b(__b), _M_c(__b), _M_e(__e)
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{ }
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typename std::iterator_traits<_FwdIterT>::value_type
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_M_current() const
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{ return *_M_c; }
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void
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_M_next()
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{ ++_M_c; }
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_FwdIterT
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_M_pos() const
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{ return _M_c; }
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const _FwdIterT&
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_M_begin() const
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{ return _M_b; }
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const _FwdIterT&
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_M_end() const
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{ return _M_e; }
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bool
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_M_at_end() const
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{ return _M_c == _M_e; }
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private:
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_FwdIterT _M_b;
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_FwdIterT _M_c;
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_FwdIterT _M_e;
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};
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// Helper function to create a cursor specialized for an iterator class.
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template<typename _FwdIterT>
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inline _SpecializedCursor<_FwdIterT>
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__cursor(const _FwdIterT& __b, const _FwdIterT __e)
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{ return _SpecializedCursor<_FwdIterT>(__b, __e); }
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//@} regex-detail
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace __detail
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} // namespace
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