Struct Nothing

pub struct Nothing<'a> { /* private fields */ }

A marker type representing a borrow of… “nothing.”

When passed as a parameter to any borrow-adjacent function or method in this crate, this type essentially turns that operation into a no-op. The lifetime is merely a placeholder to help with the common idioms detailed in the Dealing with Limitations section of the integration guide.

This is useful for disabling borrows for a given RAII’d AuToken object, as needed by strip_lifetime_analysis or for tying an object’s borrow to a different MutableBorrow or ImmutableBorrow guard.

An instance of this type cannot be obtained—it is a marker type.

Trait Implementations

impl<'a> Clone for Nothing<'a>

fn clone(&self) -> Nothing<'a>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Nothing<'a>

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

Formats the value using the given formatter.

impl<'a> Hash for Nothing<'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, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'a> Ord for Nothing<'a>

fn cmp(&self, other: &Nothing<'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 Nothing<'a>

fn eq(&self, other: &Nothing<'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 Nothing<'a>

fn partial_cmp(&self, other: &Nothing<'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 Nothing<'a>

impl<'a> Eq for Nothing<'a>

impl<'a> StructuralPartialEq for Nothing<'a>