Trait BufferHeader

pub trait BufferHeader<T: ?Sized>:
    Copy
    + Debug
    + Sized {
    const EMPTY: Self;

    // Required methods
    fn is_empty(&self) -> bool;
    fn layout(&self) -> Result<Layout, LayoutError>;
    fn update_for_alloc(
        &mut self,
        ptr: NonNull<[u8]>,
        exact: bool,
    ) -> NonNull<T>;
}

A header type used by a buffer to determine its size.

Required Associated Constants

const EMPTY: Self

The header value for a zero-sized buffer.

Required Methods

fn is_empty(&self) -> bool

Determine if this header represents a zero-sized buffer.

fn layout(&self) -> Result<Layout, LayoutError>

Calculate the layout for the associated value.

fn update_for_alloc(&mut self, ptr: NonNull<[u8]>, exact: bool) -> NonNull<T>

Update the header from the result of a new allocation.

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.

Implementors

impl<T, I: Index> BufferHeader<T> for VecHeader<I>

const EMPTY: Self = _