| use core::cmp::{self, Ordering::*}; |
| |
| #[test] |
| fn test_int_totalord() { |
| assert_eq!(5.cmp(&10), Less); |
| assert_eq!(10.cmp(&5), Greater); |
| assert_eq!(5.cmp(&5), Equal); |
| assert_eq!((-5).cmp(&12), Less); |
| assert_eq!(12.cmp(&-5), Greater); |
| } |
| |
| #[test] |
| fn test_bool_totalord() { |
| assert_eq!(true.cmp(&false), Greater); |
| assert_eq!(false.cmp(&true), Less); |
| assert_eq!(true.cmp(&true), Equal); |
| assert_eq!(false.cmp(&false), Equal); |
| } |
| |
| #[test] |
| fn test_mut_int_totalord() { |
| assert_eq!((&mut 5).cmp(&&mut 10), Less); |
| assert_eq!((&mut 10).cmp(&&mut 5), Greater); |
| assert_eq!((&mut 5).cmp(&&mut 5), Equal); |
| assert_eq!((&mut -5).cmp(&&mut 12), Less); |
| assert_eq!((&mut 12).cmp(&&mut -5), Greater); |
| } |
| |
| #[test] |
| fn test_ord_max_min() { |
| assert_eq!(1.max(2), 2); |
| assert_eq!(2.max(1), 2); |
| assert_eq!(1.min(2), 1); |
| assert_eq!(2.min(1), 1); |
| assert_eq!(1.max(1), 1); |
| assert_eq!(1.min(1), 1); |
| } |
| |
| #[test] |
| fn test_ord_min_max_by() { |
| let f = |x: &i32, y: &i32| x.abs().cmp(&y.abs()); |
| assert_eq!(cmp::min_by(1, -1, f), 1); |
| assert_eq!(cmp::min_by(1, -2, f), 1); |
| assert_eq!(cmp::min_by(2, -1, f), -1); |
| assert_eq!(cmp::max_by(1, -1, f), -1); |
| assert_eq!(cmp::max_by(1, -2, f), -2); |
| assert_eq!(cmp::max_by(2, -1, f), 2); |
| } |
| |
| #[test] |
| fn test_ord_min_max_by_key() { |
| let f = |x: &i32| x.abs(); |
| assert_eq!(cmp::min_by_key(1, -1, f), 1); |
| assert_eq!(cmp::min_by_key(1, -2, f), 1); |
| assert_eq!(cmp::min_by_key(2, -1, f), -1); |
| assert_eq!(cmp::max_by_key(1, -1, f), -1); |
| assert_eq!(cmp::max_by_key(1, -2, f), -2); |
| assert_eq!(cmp::max_by_key(2, -1, f), 2); |
| } |
| |
| #[test] |
| fn test_ordering_reverse() { |
| assert_eq!(Less.reverse(), Greater); |
| assert_eq!(Equal.reverse(), Equal); |
| assert_eq!(Greater.reverse(), Less); |
| } |
| |
| #[test] |
| fn test_ordering_order() { |
| assert!(Less < Equal); |
| assert_eq!(Greater.cmp(&Less), Greater); |
| } |
| |
| #[test] |
| fn test_ordering_then() { |
| assert_eq!(Equal.then(Less), Less); |
| assert_eq!(Equal.then(Equal), Equal); |
| assert_eq!(Equal.then(Greater), Greater); |
| assert_eq!(Less.then(Less), Less); |
| assert_eq!(Less.then(Equal), Less); |
| assert_eq!(Less.then(Greater), Less); |
| assert_eq!(Greater.then(Less), Greater); |
| assert_eq!(Greater.then(Equal), Greater); |
| assert_eq!(Greater.then(Greater), Greater); |
| } |
| |
| #[test] |
| fn test_ordering_then_with() { |
| assert_eq!(Equal.then_with(|| Less), Less); |
| assert_eq!(Equal.then_with(|| Equal), Equal); |
| assert_eq!(Equal.then_with(|| Greater), Greater); |
| assert_eq!(Less.then_with(|| Less), Less); |
| assert_eq!(Less.then_with(|| Equal), Less); |
| assert_eq!(Less.then_with(|| Greater), Less); |
| assert_eq!(Greater.then_with(|| Less), Greater); |
| assert_eq!(Greater.then_with(|| Equal), Greater); |
| assert_eq!(Greater.then_with(|| Greater), Greater); |
| } |
| |
| #[test] |
| fn test_user_defined_eq() { |
| // Our type. |
| struct SketchyNum { |
| num: isize, |
| } |
| |
| // Our implementation of `PartialEq` to support `==` and `!=`. |
| impl PartialEq for SketchyNum { |
| // Our custom eq allows numbers which are near each other to be equal! :D |
| fn eq(&self, other: &SketchyNum) -> bool { |
| (self.num - other.num).abs() < 5 |
| } |
| } |
| |
| // Now these binary operators will work when applied! |
| assert!(SketchyNum { num: 37 } == SketchyNum { num: 34 }); |
| assert!(SketchyNum { num: 25 } != SketchyNum { num: 57 }); |
| } |
