Function protobuf::rt::write_map_with_cached_sizes

pub fn write_map_with_cached_sizes<K, V>(
    field_number: u32, 
    map: &HashMap<K::Value, V::Value>, 
    os: &mut CodedOutputStream
) -> ProtobufResult<()> where
    K: ProtobufType,
    V: ProtobufType,
    K::Value: Eq + Hash, 

Write map, message sizes must be already known.