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.

Tuple Fields

0: T

Trait Implementations

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

type Guard = ConstantDeref<T>

A guard object containing the value and keeping it alive. Read more

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

The loading method. Read more

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

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

Returns a copy of the value. Read more

1.0.0 · source

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

Performs copy-assignment from source. Read more

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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. Read more

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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. Read more

1.3.0 · source

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

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

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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. Read more

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

Compares and returns the maximum of two values. Read more

1.21.0 · source

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

Compares and returns the minimum of two values. Read more

1.50.0 · source

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

Restrict a value to a certain interval. Read more

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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 ==. Read more

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

This method tests for !=.

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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. Read more

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

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

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

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

1.0.0 · source

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

This method 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

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

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impl<T> StructuralPartialEq for Constant<T>

Auto Trait Implementations

impl<T> RefUnwindSafe for Constant<T> where
T: RefUnwindSafe,

impl<T> Send for Constant<T> where
T: Send,

impl<T> Sync for Constant<T> where
T: Sync,

impl<T> Unpin for Constant<T> where
T: Unpin,

impl<T> UnwindSafe for Constant<T> where
T: UnwindSafe,

Blanket Implementations

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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,

const: unstable · source

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,

const: unstable · source

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

Mutably borrows from an owned value. Read more

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impl<T, A> DynAccess<T> for A where
A: Access<T>,
<A as Access<T>>::Guard: 'static,

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fn load(&self) -> DynGuard<T>

The equivalent of Access::load.

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impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · source

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,

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>,

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

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>,

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

Struct arc_swap::access::Constant

Tuple Fields

Trait Implementations

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

type Guard = ConstantDeref<T>

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

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

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

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

impl<T: Debug> Debug for Constant<T>

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

impl<T: Hash> Hash for Constant<T>

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

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

impl<T: Ord> Ord for Constant<T>

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

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

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

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

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

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

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

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

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

Auto Trait Implementations

impl<T> RefUnwindSafe for Constant<T> where T: RefUnwindSafe,

impl<T> Send for Constant<T> where T: Send,

impl<T> Sync for Constant<T> where T: Sync,

impl<T> Unpin for Constant<T> where T: Unpin,

impl<T> UnwindSafe for Constant<T> where T: UnwindSafe,

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

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

impl<T, A> DynAccess<T> for A where A: Access<T>, <A as Access<T>>::Guard: 'static,

fn load(&self) -> DynGuard<T>

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

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

type Owned = T

fn to_owned(&self) -> T

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

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

type Error = Infallible

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

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

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

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

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

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

impl<T> RefUnwindSafe for Constant<T> where
T: RefUnwindSafe,

impl<T> Send for Constant<T> where
T: Send,

impl<T> Sync for Constant<T> where
T: Sync,

impl<T> Unpin for Constant<T> where
T: Unpin,

impl<T> UnwindSafe for Constant<T> where
T: UnwindSafe,

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, A> DynAccess<T> for A where
A: Access<T>,
<A as Access<T>>::Guard: 'static,

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>,