1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
# C++ skeleton for Bison
# Copyright (C) 2002-2015, 2018-2019 Free Software Foundation, Inc.
# This program 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 of the License, or
# (at your option) any later version.
#
# This program 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.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# b4_stack_file
# -------------
# Name of the file containing the stack class, if we want this file.
b4_defines_if([b4_required_version_if([302], [],
[m4_define([b4_stack_file], [stack.hh])])])
# b4_stack_define
# ---------------
m4_define([b4_stack_define],
[[ /// A stack with random access from its top.
template <typename T, typename S = std::vector<T> >
class stack
{
public:
// Hide our reversed order.
typedef typename S::reverse_iterator iterator;
typedef typename S::const_reverse_iterator const_iterator;
typedef typename S::size_type size_type;
stack (size_type n = 200)
: seq_ (n)
{}
/// Random access.
///
/// Index 0 returns the topmost element.
T&
operator[] (size_type i)
{
return seq_[size () - 1 - i];
}
/// Random access.
///
/// Index 0 returns the topmost element.
T&
operator[] (int i)
{
return operator[] (size_type (i));
}
/// Random access.
///
/// Index 0 returns the topmost element.
const T&
operator[] (size_type i) const
{
return seq_[size () - 1 - i];
}
/// Random access.
///
/// Index 0 returns the topmost element.
const T&
operator[] (int i) const
{
return operator[] (size_type (i));
}
/// Steal the contents of \a t.
///
/// Close to move-semantics.
void
push (YY_MOVE_REF (T) t)
{
seq_.push_back (T ());
operator[] (0).move (t);
}
/// Pop elements from the stack.
void
pop (int n = 1) YY_NOEXCEPT
{
for (; 0 < n; --n)
seq_.pop_back ();
}
/// Pop all elements from the stack.
void
clear () YY_NOEXCEPT
{
seq_.clear ();
}
/// Number of elements on the stack.
size_type
size () const YY_NOEXCEPT
{
return seq_.size ();
}
/// Iterator on top of the stack (going downwards).
const_iterator
begin () const YY_NOEXCEPT
{
return seq_.rbegin ();
}
/// Bottom of the stack.
const_iterator
end () const YY_NOEXCEPT
{
return seq_.rend ();
}
/// Present a slice of the top of a stack.
class slice
{
public:
slice (const stack& stack, int range)
: stack_ (stack)
, range_ (range)
{}
const T&
operator[] (int i) const
{
return stack_[range_ - i];
}
private:
const stack& stack_;
int range_;
};
private:
stack (const stack&);
stack& operator= (const stack&);
/// The wrapped container.
S seq_;
};
]])
m4_ifdef([b4_stack_file],
[b4_output_begin([b4_dir_prefix], [b4_stack_file])[
]b4_generated_by[
// Starting with Bison 3.2, this file is useless: the structure it
// used to define is now defined with the parser itself.
//
// To get rid of this file:
// 1. add 'require "3.2"' (or newer) to your grammar file
// 2. remove references to this file from your build system.
]b4_output_end[
]])
|
