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
|
/*
ringbuffer.h
This file is part of GammaRay, the Qt application inspection and manipulation tool.
SPDX-FileCopyrightText: 2016 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
Author: Giulio Camuffo <giulio.camuffo@kdab.com>
SPDX-License-Identifier: GPL-2.0-or-later
Contact KDAB at <info@kdab.com> for commercial licensing options.
*/
#ifndef GAMMARAY_RINGBUFFER_H
#define GAMMARAY_RINGBUFFER_H
#include <QVector>
namespace GammaRay {
template<class T>
struct RingBuffer
{
RingBuffer(int capacity)
: m_head(0)
, m_capacity(capacity)
{
Q_ASSERT(capacity > 0);
}
int size() const
{
return qMin(m_capacity, m_vector.size());
}
int capacity() const
{
return m_capacity;
}
bool isEmpty() const
{
return size() == 0;
}
const T &last() const
{
return at(size() - 1);
}
void append(const T &t)
{
if (m_vector.size() == m_capacity) {
m_vector[m_head++] = t;
if (m_head >= m_capacity)
m_head = 0;
} else {
m_vector.append(t);
}
}
const T &at(int i) const
{
int index = (i + m_head) % m_capacity;
return m_vector.at(index);
}
void clear()
{
m_vector.clear();
m_head = 0;
}
QVector<T> m_vector;
int m_head;
int m_capacity;
};
}
#endif
|
