Trait rustc_metadata::rmeta::table::FixedSizeEncoding

pub(in rmeta) trait FixedSizeEncoding: Default {
    pub(in rmeta) const BYTE_LEN: usize;

    pub(in rmeta) fn from_bytes(
        b: &[u8]
    ) -> Self;
    pub(in rmeta) fn write_to_bytes(
        self, 
        b: &mut [u8]
    );
    pub(in rmeta) fn maybe_read_from_bytes_at(
        b: &[u8], 
        i: usize
    ) -> Option<Self>;
    pub(in rmeta) fn write_to_bytes_at(
        self, 
        b: &mut [u8], 
        i: usize
    );
}

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.

Associated Constants

pub(in rmeta) const BYTE_LEN: usize

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Required methods

pub(in rmeta) fn from_bytes(
    b: &[u8]
) -> Self

pub(in rmeta) fn write_to_bytes(
    self,
    b: &mut [u8]
)

pub(in rmeta) fn maybe_read_from_bytes_at(
    b: &[u8],
    i: usize
) -> Option<Self>

Read a Self value (encoded as Self::BYTE_LEN bytes), from &b[i * Self::BYTE_LEN..], returning None if i is not in bounds, or Some(Self::from_bytes(...)) otherwise.

pub(in rmeta) fn write_to_bytes_at(
    self,
    b: &mut [u8],
    i: usize
)

Write a Self value (encoded as Self::BYTE_LEN bytes), at &mut b[i * Self::BYTE_LEN..], using Self::write_to_bytes.

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Implementations on Foreign Types

impl FixedSizeEncoding for u32

pub(in rmeta) const BYTE_LEN: usize

pub(in rmeta) fn maybe_read_from_bytes_at(
    b: &[u8],
    i: usize
) -> Option<Self>

pub(in rmeta) fn write_to_bytes_at(
    self,
    b: &mut [u8],
    i: usize
)

pub(in rmeta) fn from_bytes(
    b: &[u8]
) -> Self

pub(in rmeta) fn write_to_bytes(
    self,
    b: &mut [u8]
)

impl<T> FixedSizeEncoding for Option<Lazy<T>>

pub(in rmeta) const BYTE_LEN: usize

pub(in rmeta) fn maybe_read_from_bytes_at(
    b: &[u8],
    i: usize
) -> Option<Self>

pub(in rmeta) fn write_to_bytes_at(
    self,
    b: &mut [u8],
    i: usize
)

pub(in rmeta) fn from_bytes(
    b: &[u8]
) -> Self

pub(in rmeta) fn write_to_bytes(
    self,
    b: &mut [u8]
)

impl<T> FixedSizeEncoding for Option<Lazy<[T]>>

pub(in rmeta) const BYTE_LEN: usize

pub(in rmeta) fn maybe_read_from_bytes_at(
    b: &[u8],
    i: usize
) -> Option<Self>

pub(in rmeta) fn write_to_bytes_at(
    self,
    b: &mut [u8],
    i: usize
)

pub(in rmeta) fn from_bytes(
    b: &[u8]
) -> Self

pub(in rmeta) fn write_to_bytes(
    self,
    b: &mut [u8]
)

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Implementors

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