mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-11 08:05:12 +00:00
253 lines
6.5 KiB
Rust
253 lines
6.5 KiB
Rust
use core::cmp::{
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self,
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Ordering::{self, *},
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};
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#[test]
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fn test_int_totalord() {
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assert_eq!(5.cmp(&10), Less);
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assert_eq!(10.cmp(&5), Greater);
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assert_eq!(5.cmp(&5), Equal);
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assert_eq!((-5).cmp(&12), Less);
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assert_eq!(12.cmp(&-5), Greater);
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}
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#[test]
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fn test_bool_totalord() {
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assert_eq!(true.cmp(&false), Greater);
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assert_eq!(false.cmp(&true), Less);
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assert_eq!(true.cmp(&true), Equal);
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assert_eq!(false.cmp(&false), Equal);
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}
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#[test]
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fn test_mut_int_totalord() {
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assert_eq!((&mut 5).cmp(&&mut 10), Less);
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assert_eq!((&mut 10).cmp(&&mut 5), Greater);
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assert_eq!((&mut 5).cmp(&&mut 5), Equal);
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assert_eq!((&mut -5).cmp(&&mut 12), Less);
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assert_eq!((&mut 12).cmp(&&mut -5), Greater);
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}
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#[test]
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fn test_ord_max_min() {
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assert_eq!(1.max(2), 2);
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assert_eq!(2.max(1), 2);
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assert_eq!(1.min(2), 1);
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assert_eq!(2.min(1), 1);
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assert_eq!(1.max(1), 1);
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assert_eq!(1.min(1), 1);
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}
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#[test]
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fn test_ord_min_max_by() {
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let f = |x: &i32, y: &i32| x.abs().cmp(&y.abs());
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assert_eq!(cmp::min_by(1, -1, f), 1);
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assert_eq!(cmp::min_by(1, -2, f), 1);
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assert_eq!(cmp::min_by(2, -1, f), -1);
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assert_eq!(cmp::max_by(1, -1, f), -1);
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assert_eq!(cmp::max_by(1, -2, f), -2);
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assert_eq!(cmp::max_by(2, -1, f), 2);
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}
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#[test]
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fn test_ord_min_max_by_key() {
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let f = |x: &i32| x.abs();
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assert_eq!(cmp::min_by_key(1, -1, f), 1);
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assert_eq!(cmp::min_by_key(1, -2, f), 1);
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assert_eq!(cmp::min_by_key(2, -1, f), -1);
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assert_eq!(cmp::max_by_key(1, -1, f), -1);
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assert_eq!(cmp::max_by_key(1, -2, f), -2);
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assert_eq!(cmp::max_by_key(2, -1, f), 2);
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}
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#[test]
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fn test_ordering_reverse() {
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assert_eq!(Less.reverse(), Greater);
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assert_eq!(Equal.reverse(), Equal);
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assert_eq!(Greater.reverse(), Less);
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}
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#[test]
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fn test_ordering_order() {
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assert!(Less < Equal);
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assert_eq!(Greater.cmp(&Less), Greater);
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}
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#[test]
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fn test_ordering_then() {
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assert_eq!(Equal.then(Less), Less);
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assert_eq!(Equal.then(Equal), Equal);
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assert_eq!(Equal.then(Greater), Greater);
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assert_eq!(Less.then(Less), Less);
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assert_eq!(Less.then(Equal), Less);
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assert_eq!(Less.then(Greater), Less);
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assert_eq!(Greater.then(Less), Greater);
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assert_eq!(Greater.then(Equal), Greater);
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assert_eq!(Greater.then(Greater), Greater);
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}
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#[test]
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fn test_ordering_then_with() {
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assert_eq!(Equal.then_with(|| Less), Less);
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assert_eq!(Equal.then_with(|| Equal), Equal);
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assert_eq!(Equal.then_with(|| Greater), Greater);
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assert_eq!(Less.then_with(|| Less), Less);
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assert_eq!(Less.then_with(|| Equal), Less);
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assert_eq!(Less.then_with(|| Greater), Less);
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assert_eq!(Greater.then_with(|| Less), Greater);
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assert_eq!(Greater.then_with(|| Equal), Greater);
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assert_eq!(Greater.then_with(|| Greater), Greater);
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}
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#[test]
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fn test_user_defined_eq() {
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// Our type.
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struct SketchyNum {
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num: isize,
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}
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// Our implementation of `PartialEq` to support `==` and `!=`.
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impl PartialEq for SketchyNum {
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// Our custom eq allows numbers which are near each other to be equal! :D
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fn eq(&self, other: &SketchyNum) -> bool {
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(self.num - other.num).abs() < 5
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}
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}
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// Now these binary operators will work when applied!
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assert!(SketchyNum { num: 37 } == SketchyNum { num: 34 });
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assert!(SketchyNum { num: 25 } != SketchyNum { num: 57 });
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}
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#[test]
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fn ordering_const() {
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// test that the methods of `Ordering` are usable in a const context
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const ORDERING: Ordering = Greater;
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const REVERSE: Ordering = ORDERING.reverse();
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assert_eq!(REVERSE, Less);
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const THEN: Ordering = Equal.then(ORDERING);
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assert_eq!(THEN, Greater);
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}
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#[test]
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fn ordering_structural_eq() {
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// test that consts of type `Ordering` are usable in patterns
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const ORDERING: Ordering = Greater;
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const REVERSE: Ordering = ORDERING.reverse();
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match Ordering::Less {
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REVERSE => {}
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_ => unreachable!(),
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};
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}
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#[test]
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fn cmp_default() {
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// Test default methods in PartialOrd and PartialEq
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#[derive(Debug)]
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struct Fool(bool);
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impl PartialEq for Fool {
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fn eq(&self, other: &Fool) -> bool {
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let Fool(this) = *self;
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let Fool(other) = *other;
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this != other
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}
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}
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struct Int(isize);
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impl PartialEq for Int {
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fn eq(&self, other: &Int) -> bool {
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let Int(this) = *self;
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let Int(other) = *other;
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this == other
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}
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}
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impl PartialOrd for Int {
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fn partial_cmp(&self, other: &Int) -> Option<Ordering> {
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let Int(this) = *self;
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let Int(other) = *other;
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this.partial_cmp(&other)
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}
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}
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struct RevInt(isize);
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impl PartialEq for RevInt {
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fn eq(&self, other: &RevInt) -> bool {
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let RevInt(this) = *self;
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let RevInt(other) = *other;
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this == other
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}
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}
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impl PartialOrd for RevInt {
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fn partial_cmp(&self, other: &RevInt) -> Option<Ordering> {
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let RevInt(this) = *self;
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let RevInt(other) = *other;
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other.partial_cmp(&this)
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}
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}
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assert!(Int(2) > Int(1));
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assert!(Int(2) >= Int(1));
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assert!(Int(1) >= Int(1));
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assert!(Int(1) < Int(2));
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assert!(Int(1) <= Int(2));
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assert!(Int(1) <= Int(1));
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assert!(RevInt(2) < RevInt(1));
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assert!(RevInt(2) <= RevInt(1));
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assert!(RevInt(1) <= RevInt(1));
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assert!(RevInt(1) > RevInt(2));
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assert!(RevInt(1) >= RevInt(2));
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assert!(RevInt(1) >= RevInt(1));
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assert_eq!(Fool(true), Fool(false));
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assert!(Fool(true) != Fool(true));
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assert!(Fool(false) != Fool(false));
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assert_eq!(Fool(false), Fool(true));
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}
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/* FIXME(#110395)
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mod const_cmp {
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use super::*;
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struct S(i32);
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impl PartialEq for S {
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fn eq(&self, other: &Self) -> bool {
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self.0 == other.0
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}
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}
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impl PartialOrd for S {
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fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
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let ret = match (self.0, other.0) {
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(a, b) if a > b => Ordering::Greater,
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(a, b) if a < b => Ordering::Less,
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_ => Ordering::Equal,
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};
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Some(ret)
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}
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}
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const _: () = assert!(S(1) == S(1));
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const _: () = assert!(S(0) != S(1));
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const _: () = assert!(S(1) <= S(1));
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const _: () = assert!(S(1) >= S(1));
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const _: () = assert!(S(0) < S(1));
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const _: () = assert!(S(1) > S(0));
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}
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*/
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