Enum Variance 

pub enum Variance {
    Invariant,
    Covariant,
    Contravariant,
}

Variants

Invariant

Default: exact type match required (no @template-covariant / @template-contravariant).

Covariant

@template-covariant T — C<Sub> is assignable to C<Super>.

Contravariant

@template-contravariant T — C<Super> is assignable to C<Sub>.

Trait Implementations

impl Clone for Variance

fn clone(&self) -> Variance

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Variance

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Variance

fn default() -> Variance

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Variance

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for Variance

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Variance

fn eq(&self, other: &Variance) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Variance

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for Variance

impl Eq for Variance

impl StructuralPartialEq for Variance