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// Checks that in a derived implementation of PartialOrd the lt, le, ge, gt methods are consistent
// with partial_cmp. Also verifies that implementation is consistent with that for tuples.
//
// run-pass
#[derive(PartialEq, PartialOrd)]
struct P(f64, f64);
fn main() {
let values: &[f64] = &[1.0, 2.0, f64::NAN];
for a in values {
for b in values {
for c in values {
for d in values {
// Check impl for a tuple.
check(&(*a, *b), &(*c, *d));
// Check derived impl.
check(&P(*a, *b), &P(*c, *d));
// Check that impls agree with each other.
assert_eq!(
PartialOrd::partial_cmp(&(*a, *b), &(*c, *d)),
PartialOrd::partial_cmp(&P(*a, *b), &P(*c, *d)),
);
}
}
}
}
}
fn check<T: PartialOrd>(a: &T, b: &T) {
use std::cmp::Ordering::*;
match PartialOrd::partial_cmp(a, b) {
None => {
assert!(!(a < b));
assert!(!(a <= b));
assert!(!(a > b));
assert!(!(a >= b));
}
Some(Equal) => {
assert!(!(a < b));
assert!(a <= b);
assert!(!(a > b));
assert!(a >= b);
}
Some(Less) => {
assert!(a < b);
assert!(a <= b);
assert!(!(a > b));
assert!(!(a >= b));
}
Some(Greater) => {
assert!(!(a < b));
assert!(!(a <= b));
assert!(a > b);
assert!(a >= b);
}
}
}
|
