Struct PhantomContravariantLifetime

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

🔬This is a nightly-only experimental API. (phantom_variance_markers #135806)

Expand description

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

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impl PhantomContravariantLifetime<'_>

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

🔬This is a nightly-only experimental API. (phantom_variance_markers #135806)

Constructs a new instance of the variance marker.

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

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

Returns a duplicate of the value. Read more

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

Performs copy-assignment from source. Read more

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impl Debug for PhantomContravariantLifetime<'_>

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

Formats the value using the given formatter. Read more

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

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fn default() -> PhantomContravariantLifetime<'a>

Returns the “default value” for a type. Read more

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

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

Feeds this value into the given Hasher. Read more

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

Feeds a slice of this type into the given Hasher. Read more

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impl<'a> Ord for PhantomContravariantLifetime<'a>

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

This method returns an Ordering between self and other. Read more

1.21.0 · Source§

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

Compares and returns the maximum of two values. Read more

1.21.0 · Source§

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

Compares and returns the minimum of two values. Read more

1.50.0 · Source§

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

Restrict a value to a certain interval. Read more

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

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

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

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

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

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impl<'a> PartialOrd for PhantomContravariantLifetime<'a>

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

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

1.0.0 · Source§

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

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

1.0.0 · Source§

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

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

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

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

1.0.0 · Source§

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

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

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impl Variance for PhantomContravariantLifetime<'_>

Auto Trait Implementations§

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impl<'a> Freeze for PhantomContravariantLifetime<'a>

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impl<'a> RefUnwindSafe for PhantomContravariantLifetime<'a>

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impl<'a> Send for PhantomContravariantLifetime<'a>

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impl<'a> Sync for PhantomContravariantLifetime<'a>

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impl<'a> Unpin for PhantomContravariantLifetime<'a>

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impl<'a> UnwindSafe for PhantomContravariantLifetime<'a>

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit #126799)

Performs copy-assignment from self to dest. Read more

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.

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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more

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impl<T, U> TryFrom for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.

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fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

Performs the conversion.

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impl<T, U> TryInto for T
where U: TryFrom<T>,

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type Error = >::Error

The type returned in the event of a conversion error.

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fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

Struct PhantomContravariantLifetimeCopy item path

§Layout

Implementations§

impl PhantomContravariantLifetime<'_>

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

Trait Implementations§

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

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

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

impl Debug for PhantomContravariantLifetime<'_>

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

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

fn default() -> PhantomContravariantLifetime<'a>

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

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

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

impl<'a> Ord for PhantomContravariantLifetime<'a>

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

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

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

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

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

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

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

impl<'a> PartialOrd for PhantomContravariantLifetime<'a>

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

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

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

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

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

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

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

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

impl Variance for PhantomContravariantLifetime<'_>

Auto Trait Implementations§

impl<'a> Freeze for PhantomContravariantLifetime<'a>

impl<'a> RefUnwindSafe for PhantomContravariantLifetime<'a>

impl<'a> Send for PhantomContravariantLifetime<'a>

impl<'a> Sync for PhantomContravariantLifetime<'a>

impl<'a> Unpin for PhantomContravariantLifetime<'a>

impl<'a> UnwindSafe for PhantomContravariantLifetime<'a>

Blanket Implementations§

impl<T> Any for Twhere T: 'static + ?Sized,

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for Twhere T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for Twhere T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

impl<T> CloneToUninit for Twhere T: Clone,

unsafe fn clone_to_uninit(&self, dest: *mut u8)

impl<T> From<T> for T

fn from(t: T) -> T

impl<T, U> Into<U> for Twhere U: From<T>,

fn into(self) -> U

impl<T> ToOwned for Twhere T: Clone,

type Owned = T

fn to_owned(&self) -> T

fn clone_into(&self, target: &mut T)

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Struct PhantomContravariantLifetime

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

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

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

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

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

impl<T> Any for T
where T: 'static + ?Sized,

impl<T> Borrow<T> for T
where T: ?Sized,

impl<T> BorrowMut<T> for T
where T: ?Sized,

impl<T> CloneToUninit for T
where T: Clone,

impl<T, U> Into<U> for T
where U: From<T>,

impl<T> ToOwned for T
where T: Clone,

impl<T, U> TryFrom<U> for T
where U: Into<T>,

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,