Struct arc_swap::access::Constant

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pub struct Constant<T>(pub T);

[−] Expand description

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.

Trait Implementations

impl<T: Clone> Access<T> for Constant<T>[+]

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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>[+]

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fn clone(&self) -> Constant<T>[−]

Returns a copy of the value.

pub fn clone_from(&mut self, source: &Self)[−]

Performs copy-assignment from source.

impl<T: Copy> Copy for Constant<T>

impl<T: Debug> Debug for Constant<T>[+]

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

Formats the value using the given formatter.

impl<T: Eq> Eq for Constant<T>

impl<T: Hash> Hash for Constant<T>[+]

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

Feeds this value into the given Hasher.

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

Feeds a slice of this type into the given Hasher.

impl<T: Ord> Ord for Constant<T>[+]

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

This method returns an Ordering between self and other.

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#[must_use]pub fn max(self, other: Self) -> Self[−]

Compares and returns the maximum of two values.

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#[must_use]pub fn min(self, other: Self) -> Self[−]

Compares and returns the minimum of two values.

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#[must_use]pub fn clamp(self, min: Self, max: Self) -> Self[−]

Restrict a value to a certain interval.

impl<T: PartialEq> PartialEq<Constant<T>> for Constant<T>[+]

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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: &Constant<T>) -> bool[−]

This method tests for !=.

impl<T: PartialOrd> PartialOrd<Constant<T>> for Constant<T>[+]

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

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

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#[must_use]pub fn lt(&self, other: &Rhs) -> bool[−]

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

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#[must_use]pub fn le(&self, other: &Rhs) -> bool[−]

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

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#[must_use]pub fn gt(&self, other: &Rhs) -> bool[−]

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

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#[must_use]pub 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> StructuralEq for Constant<T>

impl<T> StructuralPartialEq for Constant<T>