[−][src]Struct salsa::Durability
Describes how likely a value is to change -- how "durable" it is.
By default, inputs have Durability::LOW
and interned values have
Durability::HIGH
. But inputs can be explicitly set with other
durabilities.
We use durabilities to optimize the work of "revalidating" a query after some input has changed. Ordinarily, in a new revision, queries have to trace all their inputs back to the base inputs to determine if any of those inputs have changed. But if we know that the only changes were to inputs of low durability (the common case), and we know that the query only used inputs of medium durability or higher, then we can skip that enumeration.
Typically, one assigns low durabilites to inputs that the user is frequently editing. Medium or high durabilities are used for configuration, the source from library crates, or other things that are unlikely to be edited.
Implementations
impl Durability
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pub const LOW: Durability
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Low durability: things that change frequently.
Example: part of the crate being edited
pub const MEDIUM: Durability
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Medium durability: things that change sometimes, but rarely.
Example: a Cargo.toml file
pub const HIGH: Durability
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High durability: things that are not expected to change under common usage.
Example: the standard library or something from crates.io
Trait Implementations
impl Clone for Durability
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fn clone(&self) -> Durability
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fn clone_from(&mut self, source: &Self)
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impl Copy for Durability
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impl Debug for Durability
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impl Eq for Durability
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impl Ord for Durability
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fn cmp(&self, other: &Durability) -> Ordering
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#[must_use]fn max(self, other: Self) -> Self
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#[must_use]fn min(self, other: Self) -> Self
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#[must_use]fn clamp(self, min: Self, max: Self) -> Self
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impl PartialEq<Durability> for Durability
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fn eq(&self, other: &Durability) -> bool
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fn ne(&self, other: &Durability) -> bool
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impl PartialOrd<Durability> for Durability
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fn partial_cmp(&self, other: &Durability) -> Option<Ordering>
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fn lt(&self, other: &Durability) -> bool
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fn le(&self, other: &Durability) -> bool
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fn gt(&self, other: &Durability) -> bool
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fn ge(&self, other: &Durability) -> bool
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impl StructuralEq for Durability
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impl StructuralPartialEq for Durability
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Auto Trait Implementations
impl RefUnwindSafe for Durability
impl Send for Durability
impl Sync for Durability
impl Unpin for Durability
impl UnwindSafe for Durability
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<Q, K> Equivalent<K> for Q where
K: Borrow<Q> + ?Sized,
Q: Eq + ?Sized,
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K: Borrow<Q> + ?Sized,
Q: Eq + ?Sized,
fn equivalent(&self, key: &K) -> bool
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,