Struct Cache 

pub struct Cache<In, Out>(/* private fields */);

Cache for non-copyable types.

Implementations

impl<In, Out> Cache<In, Out>

where In: Hash + Eq + Clone,

pub fn len(&self) -> usize

Size of the cache

pub fn contains_key(&self, key: &In) -> bool

Returns true if the cache contains the key.

pub fn get(&self, key: &In, compute: impl FnOnce(In) -> Out) -> &Out

Returns the cached value for the given key, or runs compute if the value is not in cache.

Panics

If this is a recursive invocation for this key.

pub fn get_maybe_recursive<'a>( &'a self, key: &In, compute: impl FnOnce(In) -> Out, ) -> Option<&'a Out>

Returns the cached value for the given key, or runs compute if the value is not in cache.

Returns None if this is a recursive invocation of get for key key.

Trait Implementations

impl<In, Out> Default for Cache<In, Out>

fn default() -> Self

Returns the “default value” for a type.