#pragma once
#include <objc/runtime.h>
#include <type_traits>
#include <wtf/RetainPtr.h>
#include <wtf/spi/cocoa/objcSPI.h>
namespace WTF {
template<typename T> class WeakObjCPtr {
public:
using ValueType = typename std::remove_pointer<T>::type;
WeakObjCPtr() = default;
WeakObjCPtr(ValueType *ptr)
#if __has_feature(objc_arc)
: m_weakReference(ptr)
#endif
{
#if !__has_feature(objc_arc)
objc_initWeak(&m_weakReference, ptr);
#endif
}
#if !__has_feature(objc_arc)
WeakObjCPtr(const WeakObjCPtr& other)
{
objc_copyWeak(&m_weakReference, &other.m_weakReference);
}
WeakObjCPtr(WeakObjCPtr&& other)
{
objc_moveWeak(&m_weakReference, &other.m_weakReference);
}
~WeakObjCPtr()
{
objc_destroyWeak(&m_weakReference);
}
#endif
WeakObjCPtr& operator=(ValueType *ptr)
{
#if __has_feature(objc_arc)
m_weakReference = ptr;
#else
objc_storeWeak(&m_weakReference, ptr);
#endif
return *this;
}
bool operator!() const
{
return !get();
}
RetainPtr<ValueType> get() const
{
#if __has_feature(objc_arc)
return static_cast<ValueType *>(m_weakReference);
#else
return adoptNS(objc_loadWeakRetained(&m_weakReference));
#endif
}
ValueType *getAutoreleased() const
{
#if __has_feature(objc_arc)
return static_cast<ValueType *>(m_weakReference);
#else
return static_cast<ValueType *>(objc_loadWeak(&m_weakReference));
#endif
}
explicit operator ValueType *() const { return getAutoreleased(); }
private:
#if __has_feature(objc_arc)
mutable __weak id m_weakReference { nullptr };
#else
mutable id m_weakReference { nullptr };
#endif
};
}
using WTF::WeakObjCPtr;