38 lines
862 B
Rust
38 lines
862 B
Rust
use std::collections::{HashMap, HashSet};
|
|
use std::hash::{Hash, Hasher};
|
|
use std::sync::atomic::{AtomicUsize, Ordering::Relaxed};
|
|
|
|
struct Key(AtomicUsize);
|
|
|
|
impl Clone for Key {
|
|
fn clone(&self) -> Self {
|
|
Key(AtomicUsize::new(self.0.load(Relaxed)))
|
|
}
|
|
}
|
|
|
|
impl PartialEq for Key {
|
|
fn eq(&self, other: &Self) -> bool {
|
|
self.0.load(Relaxed) == other.0.load(Relaxed)
|
|
}
|
|
}
|
|
|
|
impl Eq for Key {}
|
|
|
|
impl Hash for Key {
|
|
fn hash<H: Hasher>(&self, h: &mut H) {
|
|
self.0.load(Relaxed).hash(h);
|
|
}
|
|
}
|
|
|
|
fn should_not_take_this_arg(m: &mut HashMap<Key, usize>, _n: usize) -> HashSet<Key> {
|
|
let _other: HashMap<Key, bool> = HashMap::new();
|
|
m.keys().cloned().collect()
|
|
}
|
|
|
|
fn this_is_ok(m: &mut HashMap<usize, Key>) {}
|
|
|
|
fn main() {
|
|
let _ = should_not_take_this_arg(&mut HashMap::new(), 1);
|
|
this_is_ok(&mut HashMap::new());
|
|
}
|