mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-10 07:04:18 +00:00
104 lines
3.4 KiB
Rust
104 lines
3.4 KiB
Rust
use std::cell::Cell;
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use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
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use std::hash::{Hash, Hasher};
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use std::rc::Rc;
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use std::sync::Arc;
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use std::sync::atomic::AtomicUsize;
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use std::sync::atomic::Ordering::Relaxed;
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struct Key(AtomicUsize);
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impl Clone for Key {
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fn clone(&self) -> Self {
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Key(AtomicUsize::new(self.0.load(Relaxed)))
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}
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}
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impl PartialEq for Key {
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fn eq(&self, other: &Self) -> bool {
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self.0.load(Relaxed) == other.0.load(Relaxed)
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}
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}
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impl Eq for Key {}
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impl Hash for Key {
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fn hash<H: Hasher>(&self, h: &mut H) {
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self.0.load(Relaxed).hash(h);
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}
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}
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fn should_not_take_this_arg(m: &mut HashMap<Key, usize>, _n: usize) -> HashSet<Key> {
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//~^ ERROR: mutable key type
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//~| NOTE: `-D clippy::mutable-key-type` implied by `-D warnings`
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//~| ERROR: mutable key type
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let _other: HashMap<Key, bool> = HashMap::new();
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//~^ ERROR: mutable key type
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m.keys().cloned().collect()
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}
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fn this_is_ok(_m: &mut HashMap<usize, Key>) {}
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// Raw pointers are hashed by the address they point to, so it doesn't matter if they point to a
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// type with interior mutability. See:
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// - clippy issue: https://github.com/rust-lang/rust-clippy/issues/6745
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// - std lib: https://github.com/rust-lang/rust/blob/1.54.0/library/core/src/hash/mod.rs#L717-L736
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// So these are OK:
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fn raw_ptr_is_ok(_m: &mut HashMap<*const Key, ()>) {}
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fn raw_mut_ptr_is_ok(_m: &mut HashMap<*mut Key, ()>) {}
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#[allow(unused)]
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trait Trait {
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type AssociatedType;
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fn trait_fn(&self, set: HashSet<Self::AssociatedType>);
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}
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fn generics_are_ok_too<K>(_m: &mut HashSet<K>) {
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// nothing to see here, move along
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}
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fn tuples<U>(_m: &mut HashMap<((), U), ()>) {}
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fn tuples_bad<U>(_m: &mut HashMap<(Key, U), bool>) {}
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//~^ ERROR: mutable key type
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fn main() {
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let _ = should_not_take_this_arg(&mut HashMap::new(), 1);
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this_is_ok(&mut HashMap::new());
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tuples::<Key>(&mut HashMap::new());
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tuples::<()>(&mut HashMap::new());
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tuples_bad::<()>(&mut HashMap::new());
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raw_ptr_is_ok(&mut HashMap::new());
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raw_mut_ptr_is_ok(&mut HashMap::new());
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let _map = HashMap::<Cell<usize>, usize>::new();
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//~^ ERROR: mutable key type
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let _map = HashMap::<&mut Cell<usize>, usize>::new();
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//~^ ERROR: mutable key type
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// Collection types from `std` who's impl of `Hash` or `Ord` delegate their type parameters
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let _map = HashMap::<Vec<Cell<usize>>, usize>::new();
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//~^ ERROR: mutable key type
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let _map = HashMap::<BTreeMap<Cell<usize>, ()>, usize>::new();
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//~^ ERROR: mutable key type
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let _map = HashMap::<BTreeMap<(), Cell<usize>>, usize>::new();
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//~^ ERROR: mutable key type
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let _map = HashMap::<BTreeSet<Cell<usize>>, usize>::new();
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//~^ ERROR: mutable key type
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let _map = HashMap::<Option<Cell<usize>>, usize>::new();
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//~^ ERROR: mutable key type
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let _map = HashMap::<Option<Vec<Cell<usize>>>, usize>::new();
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//~^ ERROR: mutable key type
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// Smart pointers from `std` who's impl of `Hash` or `Ord` delegate their type parameters
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let _map = HashMap::<Box<Cell<usize>>, usize>::new();
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//~^ ERROR: mutable key type
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let _map = HashMap::<Rc<Cell<usize>>, usize>::new();
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//~^ ERROR: mutable key type
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let _map = HashMap::<Arc<Cell<usize>>, usize>::new();
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//~^ ERROR: mutable key type
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// Not interior mutability
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let _map = HashMap::<&mut usize, usize>::new();
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let _map = HashMap::<Result<&mut usize, ()>, usize>::new();
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}
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