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use super::*;
use std::cmp::Ordering;
#[derive(Debug)]
struct S(u32);
impl PartialEq for S {
fn eq(&self, _other: &Self) -> bool {
panic!("shouldn't be called");
}
}
impl Eq for S {}
impl PartialOrd for S {
fn partial_cmp(&self, other: &S) -> Option<Ordering> {
// The `==` case should be handled by `Interned`.
assert_ne!(self.0, other.0);
self.0.partial_cmp(&other.0)
}
}
impl Ord for S {
fn cmp(&self, other: &S) -> Ordering {
// The `==` case should be handled by `Interned`.
assert_ne!(self.0, other.0);
self.0.cmp(&other.0)
}
}
#[test]
fn test_uniq() {
let s1 = S(1);
let s2 = S(2);
let s3 = S(3);
let s4 = S(1); // violates uniqueness
let v1 = Interned::new_unchecked(&s1);
let v2 = Interned::new_unchecked(&s2);
let v3a = Interned::new_unchecked(&s3);
let v3b = Interned::new_unchecked(&s3);
let v4 = Interned::new_unchecked(&s4); // violates uniqueness
assert_ne!(v1, v2);
assert_ne!(v2, v3a);
assert_eq!(v1, v1);
assert_eq!(v3a, v3b);
assert_ne!(v1, v4); // same content but different addresses: not equal
assert_eq!(v1.cmp(&v2), Ordering::Less);
assert_eq!(v3a.cmp(&v2), Ordering::Greater);
assert_eq!(v1.cmp(&v1), Ordering::Equal); // only uses Interned::eq, not S::cmp
assert_eq!(v3a.cmp(&v3b), Ordering::Equal); // only uses Interned::eq, not S::cmp
assert_eq!(v1.partial_cmp(&v2), Some(Ordering::Less));
assert_eq!(v3a.partial_cmp(&v2), Some(Ordering::Greater));
assert_eq!(v1.partial_cmp(&v1), Some(Ordering::Equal)); // only uses Interned::eq, not S::cmp
assert_eq!(v3a.partial_cmp(&v3b), Some(Ordering::Equal)); // only uses Interned::eq, not S::cmp
}
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