src/test/run-pass/cmp-default.rs

   1 use std::cmp::Ordering;
   2
   3 // Test default methods in PartialOrd and PartialEq
   4 //
   5 #[derive(Debug)]
   6 struct Fool(bool);
   7
   8 impl PartialEq for Fool {
   9     fn eq(&self, other: &Fool) -> bool {
  10         let Fool(this) = *self;
  11         let Fool(other) = *other;
  12         this != other
  13     }
  14 }
  15
  16 struct Int(isize);
  17
  18 impl PartialEq for Int {
  19     fn eq(&self, other: &Int) -> bool {
  20         let Int(this) = *self;
  21         let Int(other) = *other;
  22         this == other
  23     }
  24 }
  25
  26 impl PartialOrd for Int {
  27     fn partial_cmp(&self, other: &Int) -> Option<Ordering> {
  28         let Int(this) = *self;
  29         let Int(other) = *other;
  30         this.partial_cmp(&other)
  31     }
  32 }
  33
  34 struct RevInt(isize);
  35
  36 impl PartialEq for RevInt {
  37     fn eq(&self, other: &RevInt) -> bool {
  38         let RevInt(this) = *self;
  39         let RevInt(other) = *other;
  40         this == other
  41     }
  42 }
  43
  44 impl PartialOrd for RevInt {
  45     fn partial_cmp(&self, other: &RevInt) -> Option<Ordering> {
  46         let RevInt(this) = *self;
  47         let RevInt(other) = *other;
  48         other.partial_cmp(&this)
  49     }
  50 }
  51
  52 pub fn main() {
  53     assert!(Int(2) >  Int(1));
  54     assert!(Int(2) >= Int(1));
  55     assert!(Int(1) >= Int(1));
  56     assert!(Int(1) <  Int(2));
  57     assert!(Int(1) <= Int(2));
  58     assert!(Int(1) <= Int(1));
  59
  60     assert!(RevInt(2) <  RevInt(1));
  61     assert!(RevInt(2) <= RevInt(1));
  62     assert!(RevInt(1) <= RevInt(1));
  63     assert!(RevInt(1) >  RevInt(2));
  64     assert!(RevInt(1) >= RevInt(2));
  65     assert!(RevInt(1) >= RevInt(1));
  66
  67     assert_eq!(Fool(true), Fool(false));
  68     assert!(Fool(true)  != Fool(true));
  69     assert!(Fool(false) != Fool(false));
  70     assert_eq!(Fool(false), Fool(true));
  71 }