54 lines
1.1 KiB
Rust
54 lines
1.1 KiB
Rust
// compile-flags: --crate-name mut_key
|
|
|
|
#![warn(clippy::mutable_key_type)]
|
|
|
|
use std::cmp::{Eq, PartialEq};
|
|
use std::collections::{HashMap, HashSet};
|
|
use std::hash::{Hash, Hasher};
|
|
use std::ops::Deref;
|
|
use std::sync::atomic::{AtomicUsize, Ordering};
|
|
|
|
struct Counted<T> {
|
|
count: AtomicUsize,
|
|
val: T,
|
|
}
|
|
|
|
impl<T: Clone> Clone for Counted<T> {
|
|
fn clone(&self) -> Self {
|
|
Self {
|
|
count: AtomicUsize::new(0),
|
|
val: self.val.clone(),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<T: PartialEq> PartialEq for Counted<T> {
|
|
fn eq(&self, other: &Self) -> bool {
|
|
self.val == other.val
|
|
}
|
|
}
|
|
impl<T: PartialEq + Eq> Eq for Counted<T> {}
|
|
|
|
impl<T: Hash> Hash for Counted<T> {
|
|
fn hash<H: Hasher>(&self, state: &mut H) {
|
|
self.val.hash(state);
|
|
}
|
|
}
|
|
|
|
impl<T> Deref for Counted<T> {
|
|
type Target = T;
|
|
|
|
fn deref(&self) -> &T {
|
|
self.count.fetch_add(1, Ordering::AcqRel);
|
|
&self.val
|
|
}
|
|
}
|
|
|
|
// This is not linted because `"mut_key::Counted"` is in
|
|
// `arc_like_types` in `clippy.toml`
|
|
fn should_not_take_this_arg(_v: HashSet<Counted<String>>) {}
|
|
|
|
fn main() {
|
|
should_not_take_this_arg(HashSet::new());
|
|
}
|