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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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38
Kernel/Library/ThreadSafeRefCounted.h
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@ -15,32 +15,6 @@
namespace AK {
template<class T>
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 {};
}
// NOLINTNEXTLINE(cert-dcl50-cpp) variadic argument used to implement "is detected" pattern
constexpr auto call_will_be_destroyed_if_present(...) -> FalseType
{
return {};
}
template<class T>
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 {};
}
// NOLINTNEXTLINE(cert-dcl50-cpp) variadic argument used to implement "is detected" pattern
constexpr auto call_one_ref_left_if_present(...) -> FalseType
{
return {};
}
class RefCountedBase {
AK_MAKE_NONCOPYABLE(RefCountedBase);
AK_MAKE_NONMOVABLE(RefCountedBase);
@ -95,14 +69,18 @@ class RefCounted : public RefCountedBase {
public:
bool unref() const
{
auto const* that = static_cast<T const*>(this);
auto new_ref_count = deref_base();
if (new_ref_count == 0) {
call_will_be_destroyed_if_present(static_cast<const T*>(this));
delete static_cast<const T*>(this);
if constexpr (requires { that->will_be_destroyed(); })
that->will_be_destroyed();
delete that;
return true;
}
if (new_ref_count == 1)
call_one_ref_left_if_present(static_cast<const T*>(this));
if (new_ref_count == 1) {
if constexpr (requires { that->one_ref_left(); })
that->one_ref_left();
}
return false;
}
};