Function simpledb::rocksdb::compaction_filter::filter_callback

pub unsafe extern "C" fn filter_callback<F>(
    raw_cb: *mut c_void, 
    level: i32, 
    raw_key: *const i8, 
    key_length: usize, 
    existing_value: *const i8, 
    value_length: usize, 
    new_value: *mut *mut i8, 
    new_value_length: *mut usize, 
    value_changed: *mut u8
) -> u8 where
    F: CompactionFilterFn,