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AK: Introduce adopt_own_if_nonnull(..) to aid in Kernel OOM hardening

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Unfortunately adopt_own requires a reference, which obviously does not
work well with when attempting to harden against allocation failure.
The adopt_own_if_nonnull() variant will allow you to avoid using bare
pointers, while still allowing you to handle allocation failure.
This commit is contained in:
Brian Gianforcaro 2021-05-12 20:35:08 -07:00 • committed by Andreas Kling
parent 6d39b792f0
commit b0fef03e3f
1 changed files with 9 additions and 0 deletions
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9
AK/OwnPtr.h
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@ -191,6 +191,14 @@ inline void swap(OwnPtr<T>& a, OwnPtr<U>& b)
a.swap(b); a.swap(b);
} }
template<typename T>
inline OwnPtr<T> adopt_own_if_nonnull(T* object)
{
if (object)
return OwnPtr<T>(object);
return {};
}
template<typename T> template<typename T>
struct Traits<OwnPtr<T>> : public GenericTraits<OwnPtr<T>> { struct Traits<OwnPtr<T>> : public GenericTraits<OwnPtr<T>> {
using PeekType = T*; using PeekType = T*;
@ -201,4 +209,5 @@ struct Traits<OwnPtr<T>> : public GenericTraits<OwnPtr<T>> {
} }
using AK::adopt_own_if_nonnull;
using AK::OwnPtr; using AK::OwnPtr;