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stack.hh
1 /* A Bison parser, made by GNU Bison 2.3. */
2
3 /* Stack handling for Bison parsers in C++
4
5 Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
10 any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
21
22 /* As a special exception, you may create a larger work that contains
23 part or all of the Bison parser skeleton and distribute that work
24 under terms of your choice, so long as that work isn't itself a
25 parser generator using the skeleton or a modified version thereof
26 as a parser skeleton. Alternatively, if you modify or redistribute
27 the parser skeleton itself, you may (at your option) remove this
28 special exception, which will cause the skeleton and the resulting
29 Bison output files to be licensed under the GNU General Public
30 License without this special exception.
31
32 This special exception was added by the Free Software Foundation in
33 version 2.2 of Bison. */
34
35 #ifndef BISON_STACK_HH
36 # define BISON_STACK_HH
37
38 #include <deque>
39
40 namespace yy
41 {
42 template <class T, class S = std::deque<T> >
43 class stack
44 {
45 public:
46
47 // Hide our reversed order.
48 typedef typename S::reverse_iterator iterator;
49 typedef typename S::const_reverse_iterator const_iterator;
50
51 stack () : seq_ ()
52 {
53 }
54
55 stack (unsigned int n) : seq_ (n)
56 {
57 }
58
59 inline
60 T&
61 operator [] (unsigned int i)
62 {
63 return seq_[i];
64 }
65
66 inline
67 const T&
68 operator [] (unsigned int i) const
69 {
70 return seq_[i];
71 }
72
73 inline
74 void
75 push (const T& t)
76 {
77 seq_.push_front (t);
78 }
79
80 inline
81 void
82 pop (unsigned int n = 1)
83 {
84 for (; n; --n)
85 seq_.pop_front ();
86 }
87
88 inline
89 unsigned int
90 height () const
91 {
92 return seq_.size ();
93 }
94
95 inline const_iterator begin () const { return seq_.rbegin (); }
96 inline const_iterator end () const { return seq_.rend (); }
97
98 private:
99
100 S seq_;
101 };
102
104 template <class T, class S = stack<T> >
105 class slice
106 {
107 public:
108
109 slice (const S& stack,
110 unsigned int range) : stack_ (stack),
111 range_ (range)
112 {
113 }
114
115 inline
116 const T&
117 operator [] (unsigned int i) const
118 {
119 return stack_[range_ - i];
120 }
121
122 private:
123
124 const S& stack_;
125 unsigned int range_;
126 };
127 }
128
129 #endif // not BISON_STACK_HH
yy::slice
Present a slice of the top of a stack.
Definition: stack.hh:105
yy
Definition: json_parser.cc:101

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