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/* 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__ */
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