Struct Counter 

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

A number one thread adds to and any thread may read.

The add is a load, an add and a store rather than a fetch and add, which on x86 is three ordinary instructions instead of one locked one. That is sound because every counter here has exactly one writer, which is what the slots below are for: two threads never hold the same counter, so nothing can be lost between the load and the store. A reader can be a command or two behind, and INFO on a running server is behind by the time the reply reaches the client anyway.

Trait Implementations

impl Debug for Counter

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

Formats the value using the given formatter.

impl Default for Counter

fn default() -> Counter

Returns the “default value” for a type.