Struct Gauge 

pub struct Gauge(/* private fields */);

A gauge — a value that goes up and down, like the number of connected sessions.

Implementations

impl Gauge

pub fn incr(&self)

pub fn decr(&self)

pub fn set(&self, n: u64)

pub fn adjust(&self, was: u64, now: u64)

Replace one contributor’s share: subtract what it held, add what it holds now.

A gauge that aggregates over many things — the entries every connected subscription is arranging — cannot be set by any one of them, and re-summing them all on every render is the scan the number exists to avoid. Saturating, because a contributor that reports its departure twice must not wrap the gauge to u64::MAX.

pub fn get(&self) -> u64

Trait Implementations

impl Debug for Gauge

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

Formats the value using the given formatter.

impl Default for Gauge

fn default() -> Gauge

Returns the “default value” for a type.