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 31namespace std _GLIBCXX_VISIBILITY(default) 32{ 33namespace __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