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AK+Kernel: Use requires expression when invoking ref counting hooks

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Replace some old-school template trickery with C++20 requires. :^)
This commit is contained in:
Andreas Kling 2022-01-08 15:15:55 +01:00
parent ec74afdb8d
commit c4a0f01b02
3 changed files with 22 additions and 62 deletions
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12
Kernel/Library/ListedRefCounted.h
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@ -25,10 +25,12 @@ class ListedRefCounted : public RefCountedBase {
public:
bool unref() const
{
auto const* that = static_cast<T const*>(this);
auto callback = [&](auto& list) {
auto new_ref_count = deref_base();
if (new_ref_count == 0)
list.remove(const_cast<T&>(static_cast<T const&>(*this)));
list.remove(const_cast<T&>(*that));
return new_ref_count;
};
@ -38,10 +40,12 @@ public:
else if constexpr (Lock == LockType::Mutex)
new_ref_count = T::all_instances().with_exclusive(callback);
if (new_ref_count == 0) {
call_will_be_destroyed_if_present(static_cast<const T*>(this));
delete const_cast<T*>(static_cast<T const*>(this));
if constexpr (requires { that->will_be_destroyed(); })
that->will_be_destroyed();
delete that;
} else if (new_ref_count == 1) {
call_one_ref_left_if_present(static_cast<T const*>(this));
if constexpr (requires { that->one_ref_left(); })
that->one_ref_left();
}
return new_ref_count == 0;
}