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AK: Stop allowing implicit downcast with RefPtr and NonnullRefPtr

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We were allowing this dangerous kind of thing:

RefPtr<Base> base;
RefPtr<Derived> derived = base;

This patch changes the {Nonnull,}RefPtr constructors so this is no
longer possible.

To downcast one of these pointers, there is now static_ptr_cast<T>:

RefPtr<Derived> derived = static_ptr_cast<Derived>(base);

Fixing this exposed a ton of cowboy-downcasts in various places,
which we're now forced to fix. :^)
This commit is contained in:
Andreas Kling 2020-04-05 11:11:07 +02:00
parent 058c614110
commit 1d468ed6d3
11 changed files with 68 additions and 54 deletions
Download patch file Download diff file Expand all files Collapse all files

6
AK/NonnullRefPtr.h
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@ -68,7 +68,7 @@ public:
template<typename U>
RETURN_TYPESTATE(unconsumed)
NonnullRefPtr(const U& object)
: m_ptr(&const_cast<T&>(static_cast<const T&>(object)))
: m_ptr(&const_cast<U&>(object))
{
m_ptr->ref();
}
@ -85,7 +85,7 @@ public:
template<typename U>
RETURN_TYPESTATE(unconsumed)
NonnullRefPtr(NonnullRefPtr<U>&& other)
: m_ptr(static_cast<T*>(&other.leak_ref()))
: m_ptr(&other.leak_ref())
{
}
RETURN_TYPESTATE(unconsumed)
@ -97,7 +97,7 @@ public:
template<typename U>
RETURN_TYPESTATE(unconsumed)
NonnullRefPtr(const NonnullRefPtr<U>& other)
: m_ptr(const_cast<T*>(static_cast<const T*>((other.ptr()))))
: m_ptr(const_cast<U*>(other.ptr()))
{
m_ptr->ref();
}