Trait Variance

pub trait Variance: Sealed + Default { }

🔬This is a nightly-only experimental API. (phantom_variance_markers)

Available on crate feature std only.

A marker trait for phantom variance types.

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 Variance for PhantomContravariantLifetime<'_>

impl Variance for PhantomCovariantLifetime<'_>

impl Variance for PhantomInvariantLifetime<'_>

impl<T> Variance for PhantomContravariant<T>

where T: ?Sized,

impl<T> Variance for PhantomCovariant<T>

where T: ?Sized,

impl<T> Variance for PhantomInvariant<T>

where T: ?Sized,