Struct ThunkCache 

pub struct ThunkCache { /* private fields */ }

A named cache of lazy values.

Useful for memoizing top-level definitions that should only be evaluated once during a program run.

Implementations

impl ThunkCache

pub fn new() -> Self

Create an empty cache.

pub fn insert<T, F>(&mut self, name: impl Into<String>, f: F)

where T: Clone + Debug + Send + Sync + 'static, F: FnOnce() -> T + Send + 'static,

Insert a lazily-computed entry under name.

If name is already in the cache the old entry is replaced.

pub fn insert_pure<T>(&mut self, name: impl Into<String>, value: T)

where T: Clone + Debug + Send + Sync + 'static,

Insert a pre-evaluated value under name.

pub fn force<T>(&self, name: &str) -> Option<T>

where T: Clone + Debug + Send + Sync + 'static,

Force and return the value under name, if it exists.

pub fn contains(&self, name: &str) -> bool

Returns true if an entry with name exists in the cache.

pub fn len(&self) -> usize

Number of entries in the cache.

pub fn is_empty(&self) -> bool

Whether the cache is empty.

Trait Implementations

impl Debug for ThunkCache

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ThunkCache

fn default() -> Self

Returns the “default value” for a type.