Struct PhantomContravariantLifetime

pub struct PhantomContravariantLifetime<'a>(/* private fields */);

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

Zero-sized type used to mark a lifetime as contravariant.

Contravariant lifetimes must live at most as long as declared. See the reference for more information.

Note: If 'a is otherwise covariant or invariant, the resulting type is invariant.

Layout

For all 'a, the following are guaranteed:

• size_of::<PhantomContravariantLifetime<'a>>() == 0
• align_of::<PhantomContravariantLifetime<'a>>() == 1

Implementations

impl PhantomContravariantLifetime<'_>

pub const fn new() -> PhantomContravariantLifetime<'_>

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

Constructs a new instance of the variance marker.

Trait Implementations

impl<'a> Clone for PhantomContravariantLifetime<'a>

fn clone(&self) -> PhantomContravariantLifetime<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PhantomContravariantLifetime<'_>

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

Formats the value using the given formatter.

impl<'a> Default for PhantomContravariantLifetime<'a>

fn default() -> PhantomContravariantLifetime<'a>

Returns the “default value” for a type.

impl<'a> Hash for PhantomContravariantLifetime<'a>

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

where __H: Hasher,

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<'a> Ord for PhantomContravariantLifetime<'a>

fn cmp(&self, other: &PhantomContravariantLifetime<'a>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<'a> PartialEq for PhantomContravariantLifetime<'a>

fn eq(&self, other: &PhantomContravariantLifetime<'a>) -> 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<'a> PartialOrd for PhantomContravariantLifetime<'a>

fn partial_cmp( &self, other: &PhantomContravariantLifetime<'a>, ) -> Option<Ordering>

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

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

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl<'a> Copy for PhantomContravariantLifetime<'a>

impl<'a> Eq for PhantomContravariantLifetime<'a>

impl<'a> StructuralPartialEq for PhantomContravariantLifetime<'a>

impl Variance for PhantomContravariantLifetime<'_>