Interface FixedInt

src/fixed.rs:9–35

`FixedInt` provides encoding/decoding to and from fixed int representations. Note that current Rust versions already provide this functionality via the `to_le_bytes()` and `to_be_bytes()` methods. The emitted bytestring contains the bytes of the integer in machine endianness.

///
/// The emitted bytestring contains the bytes of the integer in machine endianness.
pub trait FixedInt: Sized + Copy {
    type Bytes: AsRef<[u8]>;
    const ENCODED_SIZE: usize = size_of::<Self>();

    /// Encode a value into the given slice using little-endian. Returns `None` if `dst`
    /// doesn't provide enough space to encode this integer.
    ///
    /// Use `switch_endianness()` if machine endianness doesn't match the desired target encoding.
    fn encode_fixed(self, dst: &mut [u8]) -> Option<()>;
    /// Returns the representation of [`FixedInt`] as [`Bytes`], the little-endian representation
    /// of self in the stack.
    fn encode_fixed_light(self) -> Self::Bytes;

    /// Decode a value from the given slice assuming little-endian. Use `switch_endianness()` on
    /// the returned value if the source was not encoded in little-endian.
    fn decode_fixed(src: &[u8]) -> Option<Self>;

    /// Helper: Encode the value and return a Vec.
    fn encode_fixed_vec(self) -> Vec<u8> {
        self.encode_fixed_light().as_ref().to_vec()
    }

    /// integer-encoding-rs always emits and receives little-endian integers (converting implicitly
    /// on big-endian machines). If you receive a big-endian integer, and would like it to be
    /// treated correctly, use this helper method to convert between endiannesses.
    fn switch_endianness(self) -> Self;
}

macro_rules! impl_fixedint {
    ($t:ty) => {