Function croaring_sys::run_container_select

pub unsafe extern "C" fn run_container_select(
    container: *const run_container_t, 
    start_rank: *mut u32, 
    rank: u32, 
    element: *mut u32
) -> bool

If the element of given rank is in this container, supposing that the first element has rank start_rank, then the function returns true and sets element accordingly. Otherwise, it returns false and update start_rank.