Struct salsa::Durability [−][src]
pub struct Durability(_);
Expand description
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
[src]
impl Durability
[src]pub const LOW: Durability
[src]
pub const LOW: Durability
[src]Low durability: things that change frequently.
Example: part of the crate being edited
pub const MEDIUM: Durability
[src]
pub const MEDIUM: Durability
[src]Medium durability: things that change sometimes, but rarely.
Example: a Cargo.toml file
pub const HIGH: Durability
[src]
pub const HIGH: Durability
[src]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
[src]
impl Clone for Durability
[src]fn clone(&self) -> Durability
[src]
fn clone(&self) -> Durability
[src]Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0[src]
fn clone_from(&mut self, source: &Self)
1.0.0[src]Performs copy-assignment from source
. Read more
impl Debug for Durability
[src]
impl Debug for Durability
[src]impl Ord for Durability
[src]
impl Ord for Durability
[src]impl PartialEq<Durability> for Durability
[src]
impl PartialEq<Durability> for Durability
[src]fn eq(&self, other: &Durability) -> bool
[src]
fn eq(&self, other: &Durability) -> bool
[src]This method tests for self
and other
values to be equal, and is used
by ==
. Read more
fn ne(&self, other: &Durability) -> bool
[src]
fn ne(&self, other: &Durability) -> bool
[src]This method tests for !=
.
impl PartialOrd<Durability> for Durability
[src]
impl PartialOrd<Durability> for Durability
[src]fn partial_cmp(&self, other: &Durability) -> Option<Ordering>
[src]
fn partial_cmp(&self, other: &Durability) -> Option<Ordering>
[src]This method returns an ordering between self
and other
values if one exists. Read more
#[must_use]fn lt(&self, other: &Rhs) -> bool
1.0.0[src]
#[must_use]fn lt(&self, other: &Rhs) -> bool
1.0.0[src]This method tests less than (for self
and other
) and is used by the <
operator. Read more
#[must_use]fn le(&self, other: &Rhs) -> bool
1.0.0[src]
#[must_use]fn le(&self, other: &Rhs) -> bool
1.0.0[src]This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
impl Copy for Durability
[src]
impl Eq for Durability
[src]
impl StructuralEq for Durability
[src]
impl StructuralPartialEq for Durability
[src]
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> BorrowMut<T> for T where
T: ?Sized,
[src]
impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]pub fn borrow_mut(&mut self) -> &mut T
[src]
pub fn borrow_mut(&mut self) -> &mut T
[src]Mutably borrows from an owned value. Read more
impl<Q, K> Equivalent<K> for Q where
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
[src]
impl<Q, K> Equivalent<K> for Q where
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
[src]pub fn equivalent(&self, key: &K) -> bool
[src]
pub fn equivalent(&self, key: &K) -> bool
[src]Compare self to key
and return true
if they are equal.
impl<T> ToOwned for T where
T: Clone,
[src]
impl<T> ToOwned for T where
T: Clone,
[src]type Owned = T
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
[src]
pub fn to_owned(&self) -> T
[src]Creates owned data from borrowed data, usually by cloning. Read more
pub fn clone_into(&self, target: &mut T)
[src]
pub fn clone_into(&self, target: &mut T)
[src]🔬 This is a nightly-only experimental API. (toowned_clone_into
)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more