etime 0.2.5

measure elapsed time
Documentation 
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#![no_std]

use core::ops::Range;
use core::time::Duration;

pub struct Etime {
    start: u64,
    clock: fn() -> u64,
}
impl Etime {
    const CLOCK_SOURCE: fn() -> u64 = clock_source::now;
    pub const fn new() -> Self {
        Self {
            start: 0,
            clock: Self::CLOCK_SOURCE,
        }
    }
    // ns
    pub fn set_clock(&mut self, clock: fn() -> u64) {
        self.clock = clock;
    }
    // ns
    #[inline]
    pub fn now(&self) -> u64 {
        (self.clock)()
    }
    pub fn tic(&mut self) {
        let now = self.now();
        self.start = now;
    }
    pub fn toc(&mut self) -> Duration {
        let now = self.now();
        let start = self.start;
        Duration::from_nanos(now - start)
    }
}

pub fn expect_time<F: FnOnce(Duration)>(val: Duration, expect: Range<Duration>, on_failed: F) {
    if !expect.contains(&val) {
        on_failed(val);
    }
}