Struct type_variance::Lifetime

pub struct Lifetime<'a> { /* fields omitted */ }

Variance-preserving type wrapper around a lifetime parameter.

This can be useful to indicate the variance of a generic type with respect to a lifetime parameter, rather than a type parameter.

For example:

use type_variance::{Covariant, Lifetime};

struct Guard<'a> {
    marker: Covariant<Lifetime<'a>>,
}

This marks Guard as being covariant to 'a.

Note that this type is not constructible, and so should be wrapped with either a PhantomData or one of the variance marker types.

Trait Implementations

impl<'a> Clone for Lifetime<'a>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for Lifetime<'a>

impl<'a> Debug for Lifetime<'a>

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

Formats the value using the given formatter.

impl<'a> Eq for Lifetime<'a>

impl<'a> Hash for Lifetime<'a>

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<'a> Ord for Lifetime<'a>

fn cmp(&self, other: &Lifetime<'a>) -> 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<'a> PartialEq<Lifetime<'a>> for Lifetime<'a>

fn eq(&self, other: &Lifetime<'a>) -> bool

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

fn ne(&self, other: &Lifetime<'a>) -> bool

This method tests for !=.

impl<'a> PartialOrd<Lifetime<'a>> for Lifetime<'a>

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

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

fn lt(&self, other: &Lifetime<'a>) -> bool

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

fn le(&self, other: &Lifetime<'a>) -> bool

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

fn gt(&self, other: &Lifetime<'a>) -> bool

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

fn ge(&self, other: &Lifetime<'a>) -> bool

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

impl<'a> StructuralEq for Lifetime<'a>

impl<'a> StructuralPartialEq for Lifetime<'a>