Function yrs::yarray_observe

#[no_mangle]
pub unsafe extern "C" fn yarray_observe(
    array: *const Branch,
    state: *mut c_void,
    cb: extern "C" fn(_: *mut c_void, _: *const YArrayEvent)
) -> u32

Subscribes a given callback function cb to changes made by this YArray instance. Callbacks are triggered whenever a ytransaction_commit is called. Returns a subscription ID which can be then used to unsubscribe this callback by using yarray_unobserve function.