[Webkit-unassigned] [Bug 177389] WeakPtrFactory should allow downcasting

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=177389

--- Comment #2 from Jiewen Tan <jiewen_tan at apple.com> ---
Geoff's proposal:

The Problem we have currently:
WeakPtr<Element> ptr = parent.createWeakPtr(); // fails: returns WeakPtr<Node>
WeakPtr<Element> ptr = parent.createWeakPtr<Element>(); // succeeds: returns WeakPtr<Element>

Solution is something like this:
   template<typename U> WeakPtr<U> createWeakPtr() const { return WeakPtr<U>(static_reference_cast<U>(m_ref); }

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