Struct Window 

pub struct Window<const N: usize> { /* private fields */ }

A rolling window of the newest N samples, and the percentiles read off it.

The samples are nanoseconds by convention rather than by type: every caller so far is timing something, and a Duration here would push the conversion into the percentile arithmetic instead of leaving it at the edges where the unit is known.

N is a const parameter and not a field so that percentiles can sort into a stack array. This runs once a frame while a debug panel is up, and a fresh Vec per call would be an allocation on that path for a buffer whose size the window already bounds.

Implementations

impl<const N: usize> Window<N>

pub fn new() -> Self

An empty window.

pub fn record(&mut self, sample: u64)

Records one sample, evicting the oldest when the window is full.

pub fn len(&self) -> usize

How many samples the window holds.

pub fn is_empty(&self) -> bool

Whether it holds none.

pub fn percentiles(&self) -> Option<(u64, u64)>

The window’s p50 and p95, or None below MIN_PERCENTILE_SAMPLES.

The floor is the whole reason this is one type rather than a sort at each call site: a p95 over fewer samples is the maximum wearing a percentile’s name, and a caller that forgets the check reports it anyway.

Trait Implementations

impl<const N: usize> Clone for Window<N>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<const N: usize> Debug for Window<N>

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

Formats the value using the given formatter.

impl<const N: usize> Default for Window<N>

fn default() -> Self

Returns the “default value” for a type.