# Struct rustc_query_system::query::caches::SingleCache

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    pub struct SingleCache<V> {
        cache: OnceLock<(V, DepNodeIndex)>,
    }

## Fields§

§`cache: OnceLock<(V, DepNodeIndex)>`

## Trait Implementations§

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### impl<V> Default for SingleCache<V>

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#### fn default() -> Self

Returns the “default value” for a type. Read more
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### impl<V> QueryCache for SingleCache<V>
where V: Copy,

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#### type Key = ()

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#### type Value = V

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#### fn lookup(&self, _key: &()) -> Option<(V, DepNodeIndex)>

Checks if the query is already computed and in the cache.
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#### fn complete(&self, _key: (), value: V, index: DepNodeIndex)

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#### fn iter(&self, f: &mut dyn FnMut(&Self::Key, &Self::Value, DepNodeIndex))

## Auto Trait Implementations§

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### impl<V> RefUnwindSafe for SingleCache<V>
where V: UnwindSafe + RefUnwindSafe,

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### impl<V> Send for SingleCache<V>
where V: Send,

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### impl<V> Sync for SingleCache<V>
where V: Sync + Send,

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### impl<V> Unpin for SingleCache<V>
where V: Unpin,

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### impl<V> UnwindSafe for SingleCache<V>
where V: 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,

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#### 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,

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

Mutably borrows from an owned value. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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

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

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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### impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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#### default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed ) -> T

## Layout§

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.