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