Struct dyn_cache::CacheMiss[][src]

pub struct CacheMiss<'k, Key: ?Sized, Scope, Input, Output, H = DefaultHashBuilder> { /* fields omitted */ }
Expand description

The result of a failed attempt to retrieve a value from the cache. Initialize a full CacheEntry for storage with CacheMiss::init.

use dyn_cache::local::LocalCache;
let mut cache = LocalCache::default();
let (scope, arg) = (&'a', &1);

let miss = cache.get(scope, arg).expect_err("first access will always be a miss");

Implementations

Prepare the cache miss to be populated by running query(arg), returning a separate value. The value returned (R) is typically derived in some way from the stored Output.

let (entry, result): (_, Vec<usize>) = miss.init(|&n| {
    let v: Vec<usize> = vec![n; n];
    (v.clone(), v)
});
cache.store(entry);
assert_eq!(result, vec![1usize]);

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Call op within the context of a Layer containing self.

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait. Read more

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait. Read more

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s. Read more

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s. Read more

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait. Read more

Performs the conversion.

Performs the conversion.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.