pub fn set_ce(&self, ce: &'static mut ClassEntry) {
        self.ce
            .compare_exchange(
                std::ptr::null_mut(),
                ce,
                Ordering::SeqCst,
                Ordering::Relaxed,
            )
            .expect("Class entry has already been set");
    }
Stores a reference to a class entry inside the class metadata.

# Parameters

* `ce` - The class entry to store.

# Panics

Panics if the class entry has already been set in the class metadata.
This function should only be called once.
src/class.rs