f83820a5d1
To make the BoundMethod classes more generic, replace direct access to private member from Signal classes with accessors or helper functions. This allows removal of friend statements from the BoundMethod classes. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
130 lines
2.8 KiB
C++
130 lines
2.8 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
|
|
/*
|
|
* Copyright (C) 2019, Google Inc.
|
|
*
|
|
* bound_method.h - Method bind and invocation
|
|
*/
|
|
#ifndef __LIBCAMERA_BOUND_METHOD_H__
|
|
#define __LIBCAMERA_BOUND_METHOD_H__
|
|
|
|
#include <tuple>
|
|
#include <type_traits>
|
|
|
|
namespace libcamera {
|
|
|
|
class Object;
|
|
|
|
class BoundMethodBase
|
|
{
|
|
public:
|
|
BoundMethodBase(void *obj, Object *object)
|
|
: obj_(obj), object_(object) {}
|
|
virtual ~BoundMethodBase() {}
|
|
|
|
template<typename T, typename std::enable_if<!std::is_same<Object, T>::value>::type * = nullptr>
|
|
bool match(T *obj) { return obj == obj_; }
|
|
bool match(Object *object) { return object == object_; }
|
|
|
|
Object *object() const { return object_; }
|
|
|
|
void activatePack(void *pack);
|
|
virtual void invokePack(void *pack) = 0;
|
|
|
|
protected:
|
|
void *obj_;
|
|
Object *object_;
|
|
};
|
|
|
|
template<typename... Args>
|
|
class BoundMethodArgs : public BoundMethodBase
|
|
{
|
|
private:
|
|
#ifndef __DOXYGEN__
|
|
/*
|
|
* This is a cheap partial implementation of std::integer_sequence<>
|
|
* from C++14.
|
|
*/
|
|
template<int...>
|
|
struct sequence {
|
|
};
|
|
|
|
template<int N, int... S>
|
|
struct generator : generator<N-1, N-1, S...> {
|
|
};
|
|
|
|
template<int... S>
|
|
struct generator<0, S...> {
|
|
typedef sequence<S...> type;
|
|
};
|
|
#endif
|
|
|
|
using PackType = std::tuple<typename std::remove_reference<Args>::type...>;
|
|
|
|
template<int... S>
|
|
void invokePack(void *pack, sequence<S...>)
|
|
{
|
|
PackType *args = static_cast<PackType *>(pack);
|
|
invoke(std::get<S>(*args)...);
|
|
delete args;
|
|
}
|
|
|
|
public:
|
|
BoundMethodArgs(void *obj, Object *object)
|
|
: BoundMethodBase(obj, object) {}
|
|
|
|
void invokePack(void *pack) override
|
|
{
|
|
invokePack(pack, typename generator<sizeof...(Args)>::type());
|
|
}
|
|
|
|
virtual void activate(Args... args) = 0;
|
|
virtual void invoke(Args... args) = 0;
|
|
};
|
|
|
|
template<typename T, typename... Args>
|
|
class BoundMemberMethod : public BoundMethodArgs<Args...>
|
|
{
|
|
public:
|
|
using PackType = std::tuple<typename std::remove_reference<Args>::type...>;
|
|
|
|
BoundMemberMethod(T *obj, Object *object, void (T::*func)(Args...))
|
|
: BoundMethodArgs<Args...>(obj, object), func_(func) {}
|
|
|
|
bool match(void (T::*func)(Args...)) const { return func == func_; }
|
|
|
|
void activate(Args... args)
|
|
{
|
|
if (this->object_)
|
|
BoundMethodBase::activatePack(new PackType{ args... });
|
|
else
|
|
(static_cast<T *>(this->obj_)->*func_)(args...);
|
|
}
|
|
|
|
void invoke(Args... args)
|
|
{
|
|
(static_cast<T *>(this->obj_)->*func_)(args...);
|
|
}
|
|
|
|
private:
|
|
void (T::*func_)(Args...);
|
|
};
|
|
|
|
template<typename... Args>
|
|
class BoundStaticMethod : public BoundMethodArgs<Args...>
|
|
{
|
|
public:
|
|
BoundStaticMethod(void (*func)(Args...))
|
|
: BoundMethodArgs<Args...>(nullptr, nullptr), func_(func) {}
|
|
|
|
bool match(void (*func)(Args...)) const { return func == func_; }
|
|
|
|
void activate(Args... args) { (*func_)(args...); }
|
|
void invoke(Args... args) {}
|
|
|
|
private:
|
|
void (*func_)(Args...);
|
|
};
|
|
|
|
}; /* namespace libcamera */
|
|
|
|
#endif /* __LIBCAMERA_BOUND_METHOD_H__ */
|