pub unsafe extern "C" fn rocksdb_compactionfilter_create(
state: *mut c_void,
destructor: Option<unsafe extern "C" fn(state: *mut c_void)>,
filter: Option<unsafe extern "C" fn(state: *mut c_void, level: c_int, key: *const c_char, key_length: size_t, existing_value: *const c_char, value_length: size_t, new_value: *mut *mut c_char, new_value_length: *mut size_t, value_changed: *mut c_uchar) -> c_uchar>,
name: Option<unsafe extern "C" fn(state: *mut c_void) -> *const c_char>
) -> *mut rocksdb_compactionfilter_t