Struct type_variance::Contravariant

pub struct Contravariant<T: ?Sized> { /* fields omitted */ }

Zero-sized type used to mark a type as contravariant with respect to its type parameter T.

See the module-level documentation for more.

Trait Implementations

impl<T: Clone + ?Sized> Clone for Contravariant<T>

fn clone(&self) -> Contravariant<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Copy + ?Sized> Copy for Contravariant<T>

impl<T: Debug + ?Sized> Debug for Contravariant<T>

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

Formats the value using the given formatter.

impl<T: ?Sized> Default for Contravariant<T>

fn default() -> Self

Returns the "default value" for a type.

impl<T: Eq + ?Sized> Eq for Contravariant<T>

impl<T: Hash + ?Sized> Hash for Contravariant<T>

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, 

Feeds a slice of this type into the given [Hasher].

impl<T: Ord + ?Sized> Ord for Contravariant<T>

fn cmp(&self, other: &Contravariant<T>) -> Ordering

This method returns an [Ordering] between self and other.

#[must_use]fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

#[must_use]fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

#[must_use]fn clamp(self, min: Self, max: Self) -> Self

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

Restrict a value to a certain interval.

impl<T: PartialEq + ?Sized> PartialEq<Contravariant<T>> for Contravariant<T>

fn eq(&self, other: &Contravariant<T>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Contravariant<T>) -> bool

This method tests for !=.

impl<T: PartialOrd + ?Sized> PartialOrd<Contravariant<T>> for Contravariant<T>

fn partial_cmp(&self, other: &Contravariant<T>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Contravariant<T>) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Contravariant<T>) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Contravariant<T>) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Contravariant<T>) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<T: ?Sized> StructuralEq for Contravariant<T>

impl<T: ?Sized> StructuralPartialEq for Contravariant<T>

impl<T: ?Sized> Variance for Contravariant<T>