Struct DoOnce 

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

A simple primitive for ensuring something is done exactly once. Not thread-safe.

e.g.

let mut once_task = DoOnce::new();
loop {
    once_task.do_once(|| {
        // this closure only runs once
    });
    //...
}

Implementations

impl DoOnce

pub const fn new() -> Self

pub fn do_once<F: FnOnce()>(&mut self, func: F)

The passed closure will be called only once, after that calling this will be a no-op.

pub fn done(&self) -> bool

Returns true if the task has been run once already