Trait Meter 

pub trait Meter<K, V> {
    type Measure: Default + Copy;

    // Required method
    fn measure<Q: ?Sized>(&self, key: &Q, value: &V) -> Self::Measure
       where K: Borrow<Q>;
}

A trait for measuring the size of a cache entry.

If you implement this trait, you should use usize as the Measure type, otherwise you will also have to implement CountableMeter.

Required Associated Types

type Measure: Default + Copy

The type used to store measurements.

Required Methods

fn measure<Q: ?Sized>(&self, key: &Q, value: &V) -> Self::Measure

where K: Borrow<Q>,

Calculate the size of key and value.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<K> Meter<K, u64> for FileSize

Given a tuple of (path, filesize), use the filesize for measurement.

type Measure = usize

impl<K, V> Meter<K, V> for Count

type Measure = ()