## Cache

# Struct Cache

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    pub struct Cache {
        cache: RefCell<HashMap<TypeId, Box<dyn Any>>>,
    }

Expand description

This is essentially a `HashMap` which allows storing any type in its input and any type in its output. It is a write-once cache; values are never evicted, which means that references to the value can safely be returned from the `get()` method.

## Fields§

§`cache: RefCell<HashMap<TypeId, Box<dyn Any>>>`

## Implementations§

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### impl Cache

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#### pub fn new() -> Cache

Creates a new empty cache.

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#### pub fn put<S: Step>(&self, step: S, value: S::Output)

Stores the result of a computation step in the cache.

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#### pub fn get<S: Step>(&self, step: &S) -> Option<S::Output>

Retrieves a cached result for the given step, if available.

## Trait Implementations§

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### impl Debug for Cache

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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 Default for Cache

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#### fn default() -> Cache

Returns the “default value” for a type. Read more

## Auto Trait Implementations§

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### impl !Freeze for Cache

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### impl !RefUnwindSafe for Cache

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### impl !Send for Cache

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### impl !Sync for Cache

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### impl Unpin for Cache

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### impl !UnwindSafe for Cache

## 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> Pointable for T

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#### const ALIGN: usize

The alignment of pointer.
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#### type Init = T

The type for initializers.
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#### unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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#### unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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#### unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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#### unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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### impl<T> Same for T

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#### type Output = T

Should always be `Self`
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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.

## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 56 bytes