dce6bb0e30
Most of the bound method classes are named with a BoundMethod prefix, except for BoundMemberMethod and BoundStaticMethod. Rename them to BoundMethodMember and BoundMethodStatic respectively to make the code more coherent. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
145 lines
3.2 KiB
C++
145 lines
3.2 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2019, Google Inc.
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*
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* signal.h - Signal & slot implementation
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*/
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#ifndef __LIBCAMERA_SIGNAL_H__
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#define __LIBCAMERA_SIGNAL_H__
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#include <list>
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#include <type_traits>
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#include <vector>
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#include <libcamera/bound_method.h>
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#include <libcamera/object.h>
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namespace libcamera {
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class SignalBase
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{
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public:
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template<typename T>
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void disconnect(T *obj)
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{
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for (auto iter = slots_.begin(); iter != slots_.end(); ) {
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BoundMethodBase *slot = *iter;
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if (slot->match(obj)) {
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iter = slots_.erase(iter);
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delete slot;
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} else {
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++iter;
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}
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}
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}
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protected:
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friend class Object;
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std::list<BoundMethodBase *> slots_;
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};
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template<typename... Args>
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class Signal : public SignalBase
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{
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public:
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Signal() {}
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~Signal()
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{
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for (BoundMethodBase *slot : slots_) {
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Object *object = slot->object();
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if (object)
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object->disconnect(this);
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delete slot;
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}
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}
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#ifndef __DOXYGEN__
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template<typename T, typename R, typename std::enable_if<std::is_base_of<Object, T>::value>::type * = nullptr>
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void connect(T *obj, R (T::*func)(Args...),
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ConnectionType type = ConnectionTypeAuto)
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{
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Object *object = static_cast<Object *>(obj);
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object->connect(this);
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slots_.push_back(new BoundMethodMember<T, void, Args...>(obj, object, func, type));
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}
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template<typename T, typename R, typename std::enable_if<!std::is_base_of<Object, T>::value>::type * = nullptr>
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#else
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template<typename T, typename R>
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#endif
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void connect(T *obj, R (T::*func)(Args...))
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{
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slots_.push_back(new BoundMethodMember<T, R, Args...>(obj, nullptr, func));
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}
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template<typename R>
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void connect(R (*func)(Args...))
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{
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slots_.push_back(new BoundMethodStatic<R, Args...>(func));
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}
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void disconnect()
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{
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for (BoundMethodBase *slot : slots_)
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delete slot;
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slots_.clear();
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}
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template<typename T>
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void disconnect(T *obj)
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{
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SignalBase::disconnect(obj);
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}
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template<typename T, typename R>
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void disconnect(T *obj, R (T::*func)(Args...))
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{
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for (auto iter = slots_.begin(); iter != slots_.end(); ) {
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BoundMethodArgs<R, Args...> *slot =
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static_cast<BoundMethodArgs<R, Args...> *>(*iter);
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/*
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* If the object matches the slot, the slot is
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* guaranteed to be a member slot, so we can safely
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* cast it to BoundMethodMember<T, Args...> to match
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* func.
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*/
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if (slot->match(obj) &&
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static_cast<BoundMethodMember<T, R, Args...> *>(slot)->match(func)) {
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iter = slots_.erase(iter);
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delete slot;
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} else {
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++iter;
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}
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}
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}
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template<typename R>
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void disconnect(R (*func)(Args...))
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{
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for (auto iter = slots_.begin(); iter != slots_.end(); ) {
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BoundMethodArgs<R, Args...> *slot = *iter;
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if (slot->match(nullptr) &&
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static_cast<BoundMethodStatic<R, Args...> *>(slot)->match(func)) {
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iter = slots_.erase(iter);
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delete slot;
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} else {
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++iter;
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}
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}
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}
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void emit(Args... args)
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{
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/*
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* Make a copy of the slots list as the slot could call the
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* disconnect operation, invalidating the iterator.
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*/
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std::vector<BoundMethodBase *> slots{ slots_.begin(), slots_.end() };
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for (BoundMethodBase *slot : slots)
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static_cast<BoundMethodArgs<void, Args...> *>(slot)->activate(args...);
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}
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};
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} /* namespace libcamera */
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#endif /* __LIBCAMERA_SIGNAL_H__ */
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