Struct PhantomInvariantLifetime

#[repr(transparent)]
pub struct PhantomInvariantLifetime<'a>(PhantomInvariant<&'a ()>);

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

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

Invariant lifetimes must be live for the exact length declared, neither shorter nor longer. See the reference for more information.

Layout

For all 'a, the following are guaranteed:

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

Tuple Fields

0: PhantomInvariant<&'a ()>

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

Implementations

impl PhantomInvariantLifetime<'_>

pub const fn new() -> Self

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

Constructs a new instance of the variance marker.

Trait Implementations

impl<'a> Clone for PhantomInvariantLifetime<'a>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for PhantomInvariantLifetime<'_>

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

Formats the value using the given formatter.

impl<'a> Default for PhantomInvariantLifetime<'a>

fn default() -> PhantomInvariantLifetime<'a>

Returns the “default value” for a type.

impl<'a> Eq for PhantomInvariantLifetime<'a>

#[doc(hidden)] fn assert_receiver_is_total_eq(&self)

impl<'a> Hash for PhantomInvariantLifetime<'a>

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

Feeds this value into the given Hasher.

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

where Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'a> Ord for PhantomInvariantLifetime<'a>

fn cmp(&self, other: &PhantomInvariantLifetime<'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 PhantomInvariantLifetime<'a>

fn eq(&self, other: &PhantomInvariantLifetime<'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 PhantomInvariantLifetime<'a>

fn partial_cmp(&self, other: &PhantomInvariantLifetime<'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.

#[doc(hidden)] fn __chaining_lt(&self, other: &Rhs) -> ControlFlow<bool>

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

If self == other, returns ControlFlow::Continue(()). Otherwise, returns ControlFlow::Break(self < other).

#[doc(hidden)] fn __chaining_le(&self, other: &Rhs) -> ControlFlow<bool>

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

Same as __chaining_lt, but for <= instead of <.

#[doc(hidden)] fn __chaining_gt(&self, other: &Rhs) -> ControlFlow<bool>

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

Same as __chaining_lt, but for > instead of <.

#[doc(hidden)] fn __chaining_ge(&self, other: &Rhs) -> ControlFlow<bool>

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

Same as __chaining_lt, but for >= instead of <.

impl Sealed for PhantomInvariantLifetime<'_>

const VALUE: Self

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

impl<'a> Copy for PhantomInvariantLifetime<'a>

impl<'a> StructuralPartialEq for PhantomInvariantLifetime<'a>

impl Variance for PhantomInvariantLifetime<'_>