Function NSAllocateObject 

pub unsafe extern "C-unwind" fn NSAllocateObject(
    a_class: &AnyClass,
    extra_bytes: NSUInteger,
    zone: *mut NSZone,
) -> Retained<AnyObject>

Available on crate features NSObject and NSZone only.

********* Object Allocation / Deallocation ******

Safety

• a_class probably has further requirements.
• zone must be a valid pointer or null.