macro_rules! integer_input {
    ( $($name:ident, $name_string:expr);+ ) => {
        $(
            /// Represents input_int_register_$i.  Its meaning depends on the
            /// programming stored in the robot.
            pub struct $name {
                /// The new value for the input register.
                pub value: i32,
            }

            impl CommandField for $name {
                fn name(&self) -> &'static str {
                    $name_string
                }

                fn size(&self) -> usize {
                    size_of::<i32>()
                }

                fn serialize(&self, buf: &mut [u8]) {
                    NetworkEndian::write_i32(&mut buf[0..4], self.value)
                }
            }
        )+
    };
}

integer_input!(
    IntegerInputRegister1, "integer_input_register1";
    IntegerInputRegister2, "integer_input_register2";
    IntegerInputRegister3, "integer_input_register3";
    IntegerInputRegister4, "integer_input_register4"
);