Struct ilyvion_util::cache::Cache

pub struct Cache<F, V>where
    F: FnOnce() -> V,{ /* private fields */ }

Caches the result of an (presumably) expensive operation such that accessing the result multiple times doesn’t result in running the expensive operation multiple times.

Implementations

impl<F, V> Cache<F, V>where F: FnOnce() -> V,

pub fn new(calculation_fn: F) -> Self

Creates a new Cache<F, V> initialized with the given calculation_fn function. The function will not be called until the result of the calculation is needed.

pub fn value_mut(&mut self) -> &mut V

Gets a mutable reference to the contained calculated value. Runs the calculation function if this method call is the first time the value is accessed.

pub fn value(&self) -> Option<&V>

Gets a shared reference to the contained calculated value if it has already been calculated.

Trait Implementations

impl<F, V: Debug> Debug for Cache<F, V>where F: FnOnce() -> V + Debug,

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

Formats the value using the given formatter.