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|
use core::cmp::{
self,
Ordering::{self, *},
};
#[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 });
}
#[test]
fn ordering_const() {
// test that the methods of `Ordering` are usable in a const context
const ORDERING: Ordering = Greater;
const REVERSE: Ordering = ORDERING.reverse();
assert_eq!(REVERSE, Less);
const THEN: Ordering = Equal.then(ORDERING);
assert_eq!(THEN, Greater);
}
|
