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/* 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_) {
slot->disconnect(this);
delete slot;
}
}
#ifndef __DOXYGEN__
template<typename T, typename std::enable_if<std::is_base_of<Object, T>::value>::type * = nullptr>
void connect(T *obj, void (T::*func)(Args...))
{
Object *object = static_cast<Object *>(obj);
object->connect(this);
slots_.push_back(new BoundMemberMethod<T, Args...>(obj, object, func));
}
template<typename T, typename std::enable_if<!std::is_base_of<Object, T>::value>::type * = nullptr>
#else
template<typename T>
#endif
void connect(T *obj, void (T::*func)(Args...))
{
slots_.push_back(new BoundMemberMethod<T, Args...>(obj, nullptr, func));
}
void connect(void (*func)(Args...))
{
slots_.push_back(new BoundStaticMethod<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>
void disconnect(T *obj, void (T::*func)(Args...))
{
for (auto iter = slots_.begin(); iter != slots_.end(); ) {
BoundMethodArgs<Args...> *slot = static_cast<BoundMethodArgs<Args...> *>(*iter);
/*
* If the object matches the slot, the slot is
* guaranteed to be a member slot, so we can safely
* cast it to BoundMemberMethod<T, Args...> and access its
* func_ member.
*/
if (slot->match(obj) &&
static_cast<BoundMemberMethod<T, Args...> *>(slot)->func_ == func) {
iter = slots_.erase(iter);
delete slot;
} else {
++iter;
}
}
}
void disconnect(void (*func)(Args...))
{
for (auto iter = slots_.begin(); iter != slots_.end(); ) {
BoundMethodArgs<Args...> *slot = *iter;
if (slot->match(nullptr) &&
static_cast<BoundStaticMethod<Args...> *>(slot)->func_ == 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<Args...> *>(slot)->activate(args...);
}
};
} /* namespace libcamera */
#endif /* __LIBCAMERA_SIGNAL_H__ */
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