Trait Metric

pub trait Metric<T> {
    type Error: Error;

    // Required method
    fn distance(&self, value: &T) -> Result<f64, Self::Error>;
}

Required Associated Types

type Error: Error

Required Methods

fn distance(&self, value: &T) -> Result<f64, Self::Error>

Returns a floating-point value that represents the “goodness” of the input with respect to some criteria

In general, the sign of the value indicates whether the input is good or bad, and the magnitude of the value represents how good/bad the input is. Representation in this fashion allows for the use of optimization algorithms to find the best input.

Implementations on Foreign Types

impl<T, M: Metric<T> + ?Sized> Metric<T> for &M

type Error = <M as Metric<T>>::Error

fn distance(&self, value: &T) -> Result<f64, Self::Error>

impl<T, M: Metric<T> + ?Sized> Metric<T> for Box<M>

type Error = <M as Metric<T>>::Error

fn distance(&self, value: &T) -> Result<f64, Self::Error>

impl<T, M: Metric<T> + ?Sized> Metric<T> for Rc<M>

type Error = <M as Metric<T>>::Error

fn distance(&self, value: &T) -> Result<f64, Self::Error>

impl<T, M: Metric<T> + ?Sized> Metric<T> for Arc<M>

type Error = <M as Metric<T>>::Error

fn distance(&self, value: &T) -> Result<f64, Self::Error>

Implementors

impl Metric<HashMap<String, f64>> for Predicate

type Error = Error

impl Metric<Trace<HashMap<String, f64>>> for Predicate

type Error = TimedError

impl<T, A, C> Metric<T> for Implies<A, C>

where A: Metric<T>, C: Metric<T>,

type Error = BinaryError<<A as Metric<T>>::Error, <C as Metric<T>>::Error>

impl<T, L, R> Metric<T> for And<L, R>

where L: Metric<T>, R: Metric<T>,

type Error = BinaryError<<L as Metric<T>>::Error, <R as Metric<T>>::Error>

impl<T, L, R> Metric<T> for Or<L, R>

where L: Metric<T>, R: Metric<T>,

type Error = BinaryError<<L as Metric<T>>::Error, <R as Metric<T>>::Error>

impl<T, P> Metric<Trace<T>> for Always<P>

where P: Metric<Trace<T>>,

type Error = <P as Metric<Trace<T>>>::Error

impl<T, P> Metric<Trace<T>> for Eventually<P>

where P: Metric<Trace<T>>,

type Error = <P as Metric<Trace<T>>>::Error

impl<T, P> Metric<Trace<T>> for Next<P>

where P: Metric<Trace<T>>,

type Error = TimedOperatorError<<P as Metric<Trace<T>>>::Error>

impl<T, U> Metric<T> for Not<U>

where U: Metric<T>,

type Error = <U as Metric<T>>::Error