Trait FixedSizeEncoding

pub(super) trait FixedSizeEncoding: IsDefault {
    type ByteArray;

    // Required methods
    fn from_bytes(b: &Self::ByteArray) -> Self;
    fn write_to_bytes(self, b: &mut Self::ByteArray);
}

Helper trait, for encoding to, and decoding from, a fixed number of bytes. Used mainly for Lazy positions and lengths. Unchecked invariant: Self::default() should encode as [0; BYTE_LEN], but this has no impact on safety.

Required Associated Types

type ByteArray

This should be [u8; BYTE_LEN]; Cannot use an associated const BYTE_LEN: usize instead due to const eval limitations.

Required Methods

fn from_bytes(b: &Self::ByteArray) -> Self

fn write_to_bytes(self, b: &mut Self::ByteArray)

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl FixedSizeEncoding for Option<AssocItemContainer>

type ByteArray = [u8; 1]

fn from_bytes(b: &[u8; 1]) -> Self

fn write_to_bytes(self, b: &mut [u8; 1])

impl FixedSizeEncoding for Option<Asyncness>

type ByteArray = [u8; 1]

fn from_bytes(b: &[u8; 1]) -> Self

fn write_to_bytes(self, b: &mut [u8; 1])

impl FixedSizeEncoding for Option<MacroKind>

type ByteArray = [u8; 1]

fn from_bytes(b: &[u8; 1]) -> Self

fn write_to_bytes(self, b: &mut [u8; 1])

impl FixedSizeEncoding for Option<bool>

type ByteArray = [u8; 1]

fn from_bytes(b: &[u8; 1]) -> Self

fn write_to_bytes(self, b: &mut [u8; 1])

impl FixedSizeEncoding for Option<RawDefId>

type ByteArray = [u8; 8]

fn from_bytes(encoded: &[u8; 8]) -> Self

fn write_to_bytes(self, dest: &mut [u8; 8])

impl FixedSizeEncoding for Option<Constness>

type ByteArray = [u8; 1]

fn from_bytes(b: &[u8; 1]) -> Self

fn write_to_bytes(self, b: &mut [u8; 1])

impl FixedSizeEncoding for Option<CoroutineKind>

type ByteArray = [u8; 1]

fn from_bytes(b: &[u8; 1]) -> Self

fn write_to_bytes(self, b: &mut [u8; 1])

impl FixedSizeEncoding for Option<DefKind>

type ByteArray = [u8; 1]

fn from_bytes(b: &[u8; 1]) -> Self

fn write_to_bytes(self, b: &mut [u8; 1])

impl FixedSizeEncoding for Option<Defaultness>

type ByteArray = [u8; 1]

fn from_bytes(b: &[u8; 1]) -> Self

fn write_to_bytes(self, b: &mut [u8; 1])

impl FixedSizeEncoding for Option<ImplPolarity>

type ByteArray = [u8; 1]

fn from_bytes(b: &[u8; 1]) -> Self

fn write_to_bytes(self, b: &mut [u8; 1])

impl FixedSizeEncoding for bool

type ByteArray = [u8; 1]

fn from_bytes(b: &[u8; 1]) -> Self

fn write_to_bytes(self, b: &mut [u8; 1])

impl FixedSizeEncoding for u32

This implementation is not used generically, but for reading/writing concrete u32 fields in Lazy* structures, which may be zero.

type ByteArray = [u8; 4]

fn from_bytes(b: &[u8; 4]) -> Self

fn write_to_bytes(self, b: &mut [u8; 4])

impl FixedSizeEncoding for u64

type ByteArray = [u8; 8]

fn from_bytes(b: &[u8; 8]) -> Self

fn write_to_bytes(self, b: &mut [u8; 8])

impl FixedSizeEncoding for UnusedGenericParams

type ByteArray = [u8; 4]

fn from_bytes(b: &[u8; 4]) -> Self

fn write_to_bytes(self, b: &mut [u8; 4])

impl<T> FixedSizeEncoding for Option<LazyArray<T>>

type ByteArray = [u8; 16]

fn from_bytes(b: &[u8; 16]) -> Self

fn write_to_bytes(self, b: &mut [u8; 16])

impl<T> FixedSizeEncoding for Option<LazyValue<T>>

type ByteArray = [u8; 8]

fn from_bytes(b: &[u8; 8]) -> Self

fn write_to_bytes(self, b: &mut [u8; 8])

Implementors

impl FixedSizeEncoding for AttrFlags

type ByteArray = [u8; 1]

impl<T> FixedSizeEncoding for LazyArray<T>

type ByteArray = [u8; 16]