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    //! Traits used in this library
    use std::io;

    /// Configuration parameter trait.
    ///
    /// Use the list of implementors to see which parameters are available for which struct.
    pub trait Parameter<Object> {
        /// Result type of `set_param`.
        // TODO: Use default type () when associated type defaults get stable.
        type Result;
        /// Sets `self` as a parameter of `Object`.
        fn set_param(self, &mut Object) -> Self::Result;
    }

    /// Implemented for objects that have parameters.
    ///
    /// Provides a unified `set`-method to simplify the configuration.
    pub trait SetParameter: Sized {
        /// Sets `value` as a parameter of `self`.
        fn set<T: Parameter<Self>>(&mut self, value: T) -> <T as Parameter<Self>>::Result {
            value.set_param(self)
        }
    }

    impl<T> SetParameter for T {}

    /// Writer extension to write little endian data
    pub trait WriteBytesExt<T> {
        /// Writes `T` to a bytes stream. Least significant byte first.
        fn write_le(&mut self, n: T) -> io::Result<()>;

        /*
        #[inline]
        fn write_byte(&mut self, n: u8) -> io::Result<()> where Self: Write {
            self.write_all(&[n])
        }
        */
    }

    impl<W: io::Write + ?Sized> WriteBytesExt<u8> for W {
        #[inline]
        fn write_le(&mut self, n: u8) -> io::Result<()> {
            self.write_all(&[n])

        }
    }

    impl<W: io::Write + ?Sized> WriteBytesExt<u16> for W {
        #[inline]
        fn write_le(&mut self, n: u16) -> io::Result<()> {
            self.write_all(&[n as u8, (n>>8) as u8])

        }
    }

    impl<W: io::Write + ?Sized> WriteBytesExt<u32> for W {
        #[inline]
        fn write_le(&mut self, n: u32) -> io::Result<()> {
            self.write_le(n as u16)?;
            self.write_le((n >> 16) as u16)

        }
    }

    impl<W: io::Write + ?Sized> WriteBytesExt<u64> for W {
        #[inline]
        fn write_le(&mut self, n: u64) -> io::Result<()> {
            self.write_le(n as u32)?;
            self.write_le((n >> 32) as u32)

        }
    }

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