Function protobuf::rt::write_map_with_cached_sizes

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