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AK: Add test for the will_be_destroyed and one_ref_left magic functions

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Fixes a regression introduced by 5c1b3ce. The commit description there
asserts that the changes allow calling will_be_destroyed and
one_ref_left, which are not required to be const qualified. The
implementation in fact does require the methods to be const qualified,
because we forgot to add the const_cast inside the decltypes :^)
This commit is contained in:
Andrew Kaster 2020-12-05 19:47:20 -07:00 • committed by Andreas Kling
parent 765d2977bc
commit 6919639190
2 changed files with 32 additions and 2 deletions
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4
AK/RefCounted.h
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@ -36,7 +36,7 @@
namespace AK {
template<class T>
constexpr auto call_will_be_destroyed_if_present(const T* object) -> decltype(object->will_be_destroyed(), TrueType {})
constexpr auto call_will_be_destroyed_if_present(const T* object) -> decltype(const_cast<T*>(object)->will_be_destroyed(), TrueType {})
{
const_cast<T*>(object)->will_be_destroyed();
return {};
@ -48,7 +48,7 @@ constexpr auto call_will_be_destroyed_if_present(...) -> FalseType
}
template<class T>
constexpr auto call_one_ref_left_if_present(const T* object) -> decltype(object->one_ref_left(), TrueType {})
constexpr auto call_one_ref_left_if_present(const T* object) -> decltype(const_cast<T*>(object)->one_ref_left(), TrueType {})
{
const_cast<T*>(object)->one_ref_left();
return {};