Struct calc_graph::Lazy

pub struct Lazy<T, F>(_);

Calculates a node's value by calling a function on demand and caching the result.

Trait Implementations

impl<T: Clone, F: FnOnce() -> T> Calc for Lazy<T, F>

type Value = T

The type of values calculated by the node.

fn add_dep(&mut self, _seen: &mut BitSet, _dep: usize)

When this node is used as a precedent, add_dep is called by dependent nodes when they are created.

fn eval(&mut self, _dirty: &mut BitSet) -> (usize, T)

Returns the value held within the node and the version number of the inputs used to calcuate that value. The value is recalculated if needed.