Trait rel_ptr::MetaData

pub unsafe trait MetaData {
    type Data: Default + Copy + Eq;
    fn decompose(this: &Self) -> (*const u8, Self::Data);
    unsafe fn compose(ptr: *const u8, data: Self::Data) -> *mut Self;
}

A trait to abstract over the sizedness of types, and to access metadata about a type

If Custom DST lands and stablizes, then it will replace MetaData

Associated Types

type Data: Default + Copy + Eq

the type of meta data a type carries

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Required methods

fn decompose(this: &Self) -> (*const u8, Self::Data)

decompose a type into a thin pointer and some metadata

unsafe fn compose(ptr: *const u8, data: Self::Data) -> *mut Self

recompose a type from a thin pointer and some metadata

it is guarenteed that the metadata is

• MetaData::Data::default() if ptr == null
• generated from MetaData::decompose

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Implementations on Foreign Types

impl<T> MetaData for [T]

type Data = usize

fn decompose(this: &Self) -> (*const u8, Self::Data)

unsafe fn compose(ptr: *const u8, data: Self::Data) -> *mut Self

impl MetaData for str

type Data = usize

fn decompose(this: &Self) -> (*const u8, Self::Data)

unsafe fn compose(ptr: *const u8, data: Self::Data) -> *mut Self

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Implementors

impl<T> MetaData for T

type Data = ()

fn decompose(this: &Self) -> (*const u8, Self::Data)

unsafe fn compose(ptr: *const u8, (): Self::Data) -> *mut Self

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