ladybird/AK/WeakPtr.h

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#pragma once
#include "Weakable.h"
namespace AK {
template<typename T> class OwnPtr;
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template<typename T>
class WeakPtr {
friend class Weakable<T>;
public:
WeakPtr() { }
WeakPtr(std::nullptr_t) { }
template<typename U>
WeakPtr(WeakPtr<U>&& other)
: m_link(reinterpret_cast<WeakLink<T>*>(other.leak_link()))
{
}
template<typename U>
WeakPtr& operator=(WeakPtr<U>&& other)
{
m_link = reinterpret_cast<WeakLink<T>*>(other.leak_link());
return *this;
}
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operator bool() const { return ptr(); }
T* ptr() { return m_link ? m_link->ptr() : nullptr; }
const T* ptr() const { return m_link ? m_link->ptr() : nullptr; }
T* operator->() { return ptr(); }
const T* operator->() const { return ptr(); }
T& operator*() { return *ptr(); }
const T& operator*() const { return *ptr(); }
operator const T*() const { return ptr(); }
operator T*() { return ptr(); }
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bool is_null() const { return !m_link || !m_link->ptr(); }
void clear() { m_link = nullptr; }
WeakLink<T>* leak_link() { return m_link.leak_ref(); }
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bool operator==(const OwnPtr<T>& other) const { return ptr() == other.ptr(); }
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private:
WeakPtr(RetainPtr<WeakLink<T>>&& link) : m_link(move(link)) { }
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RetainPtr<WeakLink<T>> m_link;
};
template<typename T>
inline WeakPtr<T> Weakable<T>::make_weak_ptr()
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{
if (!m_link)
m_link = adopt(*new WeakLink<T>(static_cast<T&>(*this)));
return WeakPtr<T>(m_link.copy_ref());
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}
}
using AK::WeakPtr;