Trait shred::CastFrom

pub unsafe trait CastFrom<T> {
    // Required method
    fn cast(t: *mut T) -> *mut Self;
}

Helper trait for the MetaTable.

This trait is required to be implemented for a trait to be compatible with the meta table.

Safety

The produced pointer must have the same provenance and address as the provided pointer and a vtable that is valid for the type T.

Examples

use shred::CastFrom;

trait Foo {
    fn foo1(&self);
    fn foo2(&mut self, x: i32) -> i32;
}

unsafe impl<T> CastFrom<T> for dyn Foo
where
    T: Foo + 'static,
{
    fn cast(t: *mut T) -> *mut (dyn Foo + 'static) {
        t
    }
}

Required Methods

fn cast(t: *mut T) -> *mut Self

Casts a concrete pointer to T to a trait object pointer.

Object Safety

This trait is not object safe.

Implementors