public:

using PreFinalizer =

cppgc::internal::PreFinalizerRegistrationDispatcher::PreFinalizer;

explicit PreFinalizerHandler(HeapBase& heap);

void RegisterPrefinalizer(PreFinalizer pre_finalizer);

void InvokePreFinalizers();

bool IsInvokingPreFinalizers() const { return is_invoking_; }

void NotifyAllocationInPrefinalizer(size_t);

size_t ExtractBytesAllocatedInPrefinalizers() {

return std::exchange(bytes_allocated_in_prefinalizers, 0);

}

private:

// Checks that the current thread is the thread that created the heap.

bool CurrentThreadIsCreationThread();

// Pre-finalizers are called in the reverse order in which they are

// registered by the constructors (including constructors of Mixin

// objects) for an object, by processing the ordered_pre_finalizers_

// back-to-front.

std::vector<PreFinalizer> ordered_pre_finalizers_;

std::vector<PreFinalizer>* current_ordered_pre_finalizers_;

HeapBase& heap_;

bool is_invoking_ = false;

#ifdef DEBUG

int creation_thread_id_;

#endif

// Counter of bytes allocated during prefinalizers.

size_t bytes_allocated_in_prefinalizers = 0u;