Variance in std::marker - Rust (original) (raw)
Trait Variance
pub trait Variance: Sealed + Default { }🔬This is a nightly-only experimental API. (phantom_variance_markers #135806)
Expand description
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 Variance for PhantomContravariant
where T: ?Sized,
impl Variance for PhantomCovariant
where T: ?Sized,
impl Variance for PhantomInvariant
where T: ?Sized,