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pub trait B16FutureEncode<I,O,E>{
	fn future_encode<F>(f:F)
		->
		Then<
			F,
			Result<O,E>,
			fn(Result<F::Item,F::Error>)->Result<O,E>
		>
		where F: Future<Item=I>;
}

macro_rules! future_encode_impl {
	($i:ty,$o:ty) => {
		impl B16FutureEncode<$i,$o,B16EncodeError> for B16<$o>{
			fn future_encode<F>(f:F)
				->
				Then<
					F,
					Result<$o,B16EncodeError>,
					fn(Result<F::Item,F::Error>)->Result<$o,B16EncodeError>
				>
				where F: Future<Item=$i>
			{
				f.then(|v|->Result<$o,B16EncodeError>{
					match v{
						Ok(o) => B16::<$o>::encode(o),
						Err(_) => Err(B16EncodeError::Undefined)
					}
				})
			}
		}
	}
}

future_encode_impl!(u8,String);
future_encode_impl!(u8,Vec<u8>);
future_encode_impl!(i8,String);
future_encode_impl!(i8,Vec<u8>);

future_encode_impl!(u16,String);
future_encode_impl!(u16,Vec<u8>);
future_encode_impl!(i16,String);
future_encode_impl!(i16,Vec<u8>);

future_encode_impl!(u32,String);
future_encode_impl!(u32,Vec<u8>);
future_encode_impl!(i32,String);
future_encode_impl!(i32,Vec<u8>);

future_encode_impl!(u64,String);
future_encode_impl!(u64,Vec<u8>);
future_encode_impl!(i64,String);
future_encode_impl!(i64,Vec<u8>);