pub unsafe extern fn rocksdb_filterpolicy_create(state: *mut c_void, destructor: Option<extern fn(arg1: *mut c_void)>, create_filter: Option<extern fn(arg1: *mut c_void, key_array: *const *const c_char, key_length_array: *const size_t, num_keys: c_int, filter_length: *mut size_t) -> *mut c_char>, key_may_match: Option<extern fn(arg1: *mut c_void, key: *const c_char, length: size_t, filter: *const c_char, filter_length: size_t) -> c_uchar>, delete_filter: Option<extern fn(arg1: *mut c_void, filter: *const c_char, filter_length: size_t)>, name: Option<extern fn(arg1: *mut c_void) -> *const c_char>) -> *mut rocksdb_filterpolicy_t