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pub trait B16FutureDecode<I,O,E>{
	fn future_decode<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_decode_impl {
	($i:ty,$o:ty) => {
		impl B16FutureDecode<$i,$o,B16DecodeError> for B16<$o>{
			fn future_decode<F>(f:F)
				->
				Then<
					F,
					Result<$o,B16DecodeError>,
					fn(Result<F::Item,F::Error>)->Result<$o,B16DecodeError>
				>
				where F: Future<Item=$i>
			{
				f.then(|v|->Result<$o,B16DecodeError>{
					match v{
						Ok(o) => B16::<$o>::decode(o),
						Err(_) => Err(B16DecodeError::Undefined)
					}
				})
			}
		}
	}
}

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

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

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

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