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#![allow(clippy::module_name_repetitions)]
use std::error::Error as StdError;
use std::fmt::{self, Display};
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::Arc;
#[derive(Debug)]
pub struct Flag {
atomic: Arc<AtomicBool>,
}
impl Flag {
pub fn new() -> Self {
Flag {
atomic: Arc::new(AtomicBool::new(false)),
}
}
pub fn get(&self) -> bool {
self.atomic.load(Ordering::Relaxed)
}
}
#[derive(Debug)]
pub struct DetectDrop {
has_dropped: Flag,
}
impl DetectDrop {
pub fn new(has_dropped: &Flag) -> Self {
DetectDrop {
has_dropped: Flag {
atomic: Arc::clone(&has_dropped.atomic),
},
}
}
}
impl StdError for DetectDrop {}
impl Display for DetectDrop {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "oh no!")
}
}
impl Drop for DetectDrop {
fn drop(&mut self) {
let already_dropped = self.has_dropped.atomic.swap(true, Ordering::Relaxed);
assert!(!already_dropped);
}
}
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