pub trait RefCast {
type From: ?Sized;
// Required methods
fn ref_cast(from: &Self::From) -> &Self;
fn ref_cast_mut(from: &mut Self::From) -> &mut Self;
}
Expand description
Safely cast &T
to &U
where the struct U
contains a single field of
type T
.
// `&String` can be cast to `&U`.
#[derive(RefCast)]
#[repr(transparent)]
struct U(String);
// `&T` can be cast to `&V<T>`.
#[derive(RefCast)]
#[repr(transparent)]
struct V<T> {
t: T,
}
See the crate-level documentation for usage examples!