Trait MetaData 

pub unsafe trait MetaData {
    type Data: Copy + Eq;

    // Required methods
    fn data(this: &Self) -> Self::Data;
    unsafe fn compose(ptr: Ptr<u8>, data: Self::Data) -> Ptr<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

Required Associated Types

type Data: Copy + Eq

the type of meta data a type carries

Required Methods

fn data(this: &Self) -> Self::Data

decompose a type into a thin pointer and some metadata

unsafe fn compose(ptr: Ptr<u8>, data: Self::Data) -> Ptr<Self>

recompose a type from a thin pointer and some metadata

it is guarenteed that the metadata is

• ptr == None Self::Data is undefined
• ptr != None generated from MetaData::data

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 MetaData for str

type Data = usize

fn data(this: &Self) -> Self::Data

unsafe fn compose(ptr: Ptr<u8>, data: Self::Data) -> Ptr<Self>

impl<T> MetaData for [T]

type Data = usize

fn data(this: &Self) -> Self::Data

unsafe fn compose(ptr: Ptr<u8>, data: Self::Data) -> Ptr<Self>

Implementors

impl<T> MetaData for T

type Data = ()