Struct DecayCounter 

pub struct DecayCounter { /* private fields */ }

An evaporating access tally — a counter that is added to on access and decays geometrically over time.

This is recency-weighting for free: a steady stream of accesses holds the value up, a burst that stops fades away, so the value tracks current pressure without a separate windowing scheme. (Stigmergy: the same mechanic as ant-trail pheromones — deposit on use, evaporate over time — and the discounted-count cousin of SlidingWindowUcb1.)

Implementations

impl DecayCounter

pub fn new(decay: f64) -> Self

Creates a counter starting at zero with per-tick retention decay, clamped to [0, 1] (e.g. 0.9 keeps 90 % of the value each tick).

pub fn add(&mut self, amount: f64)

Deposits amount (an access this tick).

pub fn tick(&mut self)

Evaporates the value by the decay factor — call once per time step.

pub fn value(&self) -> f64

The current (recency-weighted) value.

Trait Implementations

impl Clone for DecayCounter

fn clone(&self) -> DecayCounter

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DecayCounter

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

Formats the value using the given formatter.

impl Copy for DecayCounter