Method downcast_ref

crates/vm/src/object/core.rs:1508–1516

(&self)

    /// Attempt to downcast this reference to a subclass.
    #[inline(always)]
    pub fn downcast_ref<T: PyPayload>(&self) -> Option<&Py<T>> {
        if self.downcastable::<T>() {
            // SAFETY: just checked that the payload is T, and PyRef is repr(transparent) over
            // PyObjectRef
            Some(unsafe { self.downcast_unchecked_ref::<T>() })
        } else {
            None
        }
    }

    #[inline(always)]
    pub fn downcast_ref_if_exact<T: PyPayload>(&self, vm: &VirtualMachine) -> Option<&Py<T>> {