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AK+Kernel: Add an OOM-fallible try variant make_weak_ptr()

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This will allow us to propagate allocation errors that may be raised by
the construction of the WeakLink.
This commit is contained in:
Idan Horowitz 2022-02-13 21:16:21 +02:00 • committed by Andreas Kling
parent d6ea6c39a7
commit 98c20b65cc
3 changed files with 28 additions and 14 deletions
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16
AK/WeakPtr.h
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@ -151,10 +151,10 @@ private:
template<typename T>
template<typename U>
inline WeakPtr<U> Weakable<T>::make_weak_ptr() const
inline ErrorOr<WeakPtr<U>> Weakable<T>::try_make_weak_ptr() const
{
if (!m_link)
m_link = adopt_ref(*new WeakLink(const_cast<T&>(static_cast<T const&>(*this))));
m_link = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) WeakLink(const_cast<T&>(static_cast<T const&>(*this)))));
return WeakPtr<U>(m_link);
}
@ -168,12 +168,18 @@ struct Formatter<WeakPtr<T>> : Formatter<const T*> {
};
template<typename T>
WeakPtr<T> make_weak_ptr_if_nonnull(const T* ptr)
ErrorOr<WeakPtr<T>> try_make_weak_ptr_if_nonnull(T const* ptr)
{
if (ptr) {
return ptr->template make_weak_ptr<T>();
return ptr->template try_make_weak_ptr<T>();
}
return {};
return WeakPtr<T> {};
}
template<typename T>
WeakPtr<T> make_weak_ptr_if_nonnull(T const* ptr)
{
return MUST(try_make_weak_ptr_if_nonnull(ptr));
}
}

4
AK/Weakable.h
View file

@ -106,7 +106,9 @@ private:
public:
template<typename U = T>
WeakPtr<U> make_weak_ptr() const;
WeakPtr<U> make_weak_ptr() const { return MUST(try_make_weak_ptr<U>()); }
template<typename U = T>
ErrorOr<WeakPtr<U>> try_make_weak_ptr() const;
protected:
Weakable() = default;