libstdc++

regex_cursor.h
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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