Function librocksdbsys::crocksdb_comparator_create

pub unsafe extern "C" fn crocksdb_comparator_create(
    state: *mut c_void, 
    destroy: extern "C" fn(_: *mut c_void), 
    compare: extern "C" fn(arg: *mut c_void, a: *const c_char, alen: size_t, b: *const c_char, blen: size_t) -> c_int, 
    name_fn: extern "C" fn(_: *mut c_void) -> *const c_char
) -> *mut DBComparator