Trait rustc_metadata::rmeta::table::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)

Implementations on Foreign Types

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<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 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 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 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 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 DefPathHash

type ByteArray = [u8; 16]

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

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

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<RawDefId>

type ByteArray = [u8; 8]

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

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

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<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])

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 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<AssocItemContainer>

type ByteArray = [u8; 1]

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

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

Implementors

impl FixedSizeEncoding for AttrFlags

type ByteArray = [u8; 1]

impl<T> FixedSizeEncoding for LazyArray<T>

type ByteArray = [u8; 16]