1 use core::cmp::{self, Ordering::*};
4 fn test_int_totalord() {
5 assert_eq!(5.cmp(&10), Less);
6 assert_eq!(10.cmp(&5), Greater);
7 assert_eq!(5.cmp(&5), Equal);
8 assert_eq!((-5).cmp(&12), Less);
9 assert_eq!(12.cmp(&-5), Greater);
13 fn test_bool_totalord() {
14 assert_eq!(true.cmp(&false), Greater);
15 assert_eq!(false.cmp(&true), Less);
16 assert_eq!(true.cmp(&true), Equal);
17 assert_eq!(false.cmp(&false), Equal);
21 fn test_mut_int_totalord() {
22 assert_eq!((&mut 5).cmp(&&mut 10), Less);
23 assert_eq!((&mut 10).cmp(&&mut 5), Greater);
24 assert_eq!((&mut 5).cmp(&&mut 5), Equal);
25 assert_eq!((&mut -5).cmp(&&mut 12), Less);
26 assert_eq!((&mut 12).cmp(&&mut -5), Greater);
30 fn test_ord_max_min() {
31 assert_eq!(1.max(2), 2);
32 assert_eq!(2.max(1), 2);
33 assert_eq!(1.min(2), 1);
34 assert_eq!(2.min(1), 1);
35 assert_eq!(1.max(1), 1);
36 assert_eq!(1.min(1), 1);
40 fn test_ord_min_max_by() {
41 let f = |x: &i32, y: &i32| x.abs().cmp(&y.abs());
42 assert_eq!(cmp::min_by(1, -1, f), 1);
43 assert_eq!(cmp::min_by(1, -2, f), 1);
44 assert_eq!(cmp::min_by(2, -1, f), -1);
45 assert_eq!(cmp::max_by(1, -1, f), -1);
46 assert_eq!(cmp::max_by(1, -2, f), -2);
47 assert_eq!(cmp::max_by(2, -1, f), 2);
51 fn test_ord_min_max_by_key() {
52 let f = |x: &i32| x.abs();
53 assert_eq!(cmp::min_by_key(1, -1, f), 1);
54 assert_eq!(cmp::min_by_key(1, -2, f), 1);
55 assert_eq!(cmp::min_by_key(2, -1, f), -1);
56 assert_eq!(cmp::max_by_key(1, -1, f), -1);
57 assert_eq!(cmp::max_by_key(1, -2, f), -2);
58 assert_eq!(cmp::max_by_key(2, -1, f), 2);
62 fn test_ordering_reverse() {
63 assert_eq!(Less.reverse(), Greater);
64 assert_eq!(Equal.reverse(), Equal);
65 assert_eq!(Greater.reverse(), Less);
69 fn test_ordering_order() {
70 assert!(Less < Equal);
71 assert_eq!(Greater.cmp(&Less), Greater);
75 fn test_ordering_then() {
76 assert_eq!(Equal.then(Less), Less);
77 assert_eq!(Equal.then(Equal), Equal);
78 assert_eq!(Equal.then(Greater), Greater);
79 assert_eq!(Less.then(Less), Less);
80 assert_eq!(Less.then(Equal), Less);
81 assert_eq!(Less.then(Greater), Less);
82 assert_eq!(Greater.then(Less), Greater);
83 assert_eq!(Greater.then(Equal), Greater);
84 assert_eq!(Greater.then(Greater), Greater);
88 fn test_ordering_then_with() {
89 assert_eq!(Equal.then_with(|| Less), Less);
90 assert_eq!(Equal.then_with(|| Equal), Equal);
91 assert_eq!(Equal.then_with(|| Greater), Greater);
92 assert_eq!(Less.then_with(|| Less), Less);
93 assert_eq!(Less.then_with(|| Equal), Less);
94 assert_eq!(Less.then_with(|| Greater), Less);
95 assert_eq!(Greater.then_with(|| Less), Greater);
96 assert_eq!(Greater.then_with(|| Equal), Greater);
97 assert_eq!(Greater.then_with(|| Greater), Greater);
101 fn test_user_defined_eq() {
107 // Our implementation of `PartialEq` to support `==` and `!=`.
108 impl PartialEq for SketchyNum {
109 // Our custom eq allows numbers which are near each other to be equal! :D
110 fn eq(&self, other: &SketchyNum) -> bool {
111 (self.num - other.num).abs() < 5
115 // Now these binary operators will work when applied!
116 assert!(SketchyNum { num: 37 } == SketchyNum { num: 34 });
117 assert!(SketchyNum { num: 25 } != SketchyNum { num: 57 });