Struct arc_swap::access::Constant

pub struct Constant<T>(pub T);

Access to an constant.

This wraps a constant value to provide Access to it. It is constant in the sense that, unlike ArcSwapAny and Map, the loaded value will always stay the same (there’s no remote store).

The purpose is mostly testing and plugging a parameter that works generically from code that doesn’t need the updating functionality.

Tuple Fields

0: T

Trait Implementations

impl<T: Clone> Access<T> for Constant<T>

type Guard = ConstantDeref<T>

A guard object containing the value and keeping it alive.

fn load(&self) -> Self::Guard

The loading method.

impl<T: Clone> Clone for Constant<T>

fn clone(&self) -> Constant<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for Constant<T>

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

Formats the value using the given formatter.

impl<T: Hash> Hash for Constant<T>

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<T: Ord> Ord for Constant<T>

fn cmp(&self, other: &Constant<T>) -> Ordering

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

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

Restrict a value to a certain interval.

impl<T: PartialEq> PartialEq<Constant<T>> for Constant<T>

fn eq(&self, other: &Constant<T>) -> bool

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

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

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

impl<T: PartialOrd> PartialOrd<Constant<T>> for Constant<T>

fn partial_cmp(&self, other: &Constant<T>) -> Option<Ordering>

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

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

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

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

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

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

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

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

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

impl<T: Copy> Copy for Constant<T>

impl<T: Eq> Eq for Constant<T>

impl<T> StructuralEq for Constant<T>

impl<T> StructuralPartialEq for Constant<T>