Trait Keepalive 

pub trait Keepalive: Send + Sync {
    // Required methods
    fn addr(&self) -> usize;
    fn size(&self) -> usize;

    // Provided method
    fn downgrade(&self) -> Option<Arc<dyn WeakKeepalive>> { ... }
}

Trait for values that keep a backing memory allocation alive and know its address and size.

As long as a value implementing this trait exists, the memory region it describes is guaranteed to remain valid.

Required Methods

fn addr(&self) -> usize

Start address of the memory region this keepalive pins.

fn size(&self) -> usize

Size in bytes of the memory region this keepalive pins.

Provided Methods

fn downgrade(&self) -> Option<Arc<dyn WeakKeepalive>>

Produce a WeakKeepalive pointing at the same underlying resource. Defaults to None for impls with no weak form.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl Keepalive for Box<[u8]>

fn addr(&self) -> usize

fn size(&self) -> usize

Implementors