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