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
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* signal.h - Signal & slot implementation
*/
#ifndef __LIBCAMERA_SIGNAL_H__
#define __LIBCAMERA_SIGNAL_H__
#include <list>
#include <type_traits>
#include <vector>
#include <libcamera/bound_method.h>
#include <libcamera/object.h>
namespace libcamera {
class SignalBase
{
public:
template<typename T>
void disconnect(T *obj)
{
for (auto iter = slots_.begin(); iter != slots_.end(); ) {
BoundMethodBase *slot = *iter;
if (slot->match(obj)) {
iter = slots_.erase(iter);
delete slot;
} else {
++iter;
}
}
}
protected:
friend class Object;
std::list<BoundMethodBase *> slots_;
};
template<typename... Args>
class Signal : public SignalBase
{
public:
Signal() {}
~Signal()
{
for (BoundMethodBase *slot : slots_) {
Object *object = slot->object();
if (object)
object->disconnect(this);
delete slot;
}
}
#ifndef __DOXYGEN__
template<typename T, typename R, typename std::enable_if<std::is_base_of<Object, T>::value>::type * = nullptr>
void connect(T *obj, R (T::*func)(Args...),
ConnectionType type = ConnectionTypeAuto)
{
Object *object = static_cast<Object *>(obj);
object->connect(this);
slots_.push_back(new BoundMethodMember<T, void, Args...>(obj, object, func, type));
}
template<typename T, typename R, typename std::enable_if<!std::is_base_of<Object, T>::value>::type * = nullptr>
#else
template<typename T, typename R>
#endif
void connect(T *obj, R (T::*func)(Args...))
{
slots_.push_back(new BoundMethodMember<T, R, Args...>(obj, nullptr, func));
}
template<typename R>
void connect(R (*func)(Args...))
{
slots_.push_back(new BoundMethodStatic<R, Args...>(func));
}
void disconnect()
{
for (BoundMethodBase *slot : slots_)
delete slot;
slots_.clear();
}
template<typename T>
void disconnect(T *obj)
{
SignalBase::disconnect(obj);
}
template<typename T, typename R>
void disconnect(T *obj, R (T::*func)(Args...))
{
for (auto iter = slots_.begin(); iter != slots_.end(); ) {
BoundMethodArgs<R, Args...> *slot =
static_cast<BoundMethodArgs<R, Args...> *>(*iter);
/*
* If the object matches the slot, the slot is
* guaranteed to be a member slot, so we can safely
* cast it to BoundMethodMember<T, Args...> to match
* func.
*/
if (slot->match(obj) &&
static_cast<BoundMethodMember<T, R, Args...> *>(slot)->match(func)) {
iter = slots_.erase(iter);
delete slot;
} else {
++iter;
}
}
}
template<typename R>
void disconnect(R (*func)(Args...))
{
for (auto iter = slots_.begin(); iter != slots_.end(); ) {
BoundMethodArgs<R, Args...> *slot = *iter;
if (slot->match(nullptr) &&
static_cast<BoundMethodStatic<R, Args...> *>(slot)->match(func)) {
iter = slots_.erase(iter);
delete slot;
} else {
++iter;
}
}
}
void emit(Args... args)
{
/*
* Make a copy of the slots list as the slot could call the
* disconnect operation, invalidating the iterator.
*/
std::vector<BoundMethodBase *> slots{ slots_.begin(), slots_.end() };
for (BoundMethodBase *slot : slots)
static_cast<BoundMethodArgs<void, Args...> *>(slot)->activate(args...);
}
};
} /* namespace libcamera */
#endif /* __LIBCAMERA_SIGNAL_H__ */
|
