rocksdb::ffi::rocksdb_comparator_create

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