src/test/run-pass/deriving-cmp-generic-enum.rs

   1 // Copyright 2013 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // no-pretty-expanded FIXME #15189
  12
  13 #[derive(PartialEq, Eq, PartialOrd, Ord)]
  14 enum E<T> {
  15     E0,
  16     E1(T),
  17     E2(T,T)
  18 }
  19
  20 pub fn main() {
  21     let e0 = E::E0;
  22     let e11 = E::E1(1);
  23     let e12 = E::E1(2);
  24     let e21 = E::E2(1, 1);
  25     let e22 = E::E2(1, 2);
  26
  27     // in order for both PartialOrd and Ord
  28     let es = [e0, e11, e12, e21, e22];
  29
  30     for (i, e1) in es.iter().enumerate() {
  31         for (j, e2) in es.iter().enumerate() {
  32             let ord = i.cmp(&j);
  33
  34             let eq = i == j;
  35             let lt = i < j;
  36             let le = i <= j;
  37             let gt = i > j;
  38             let ge = i >= j;
  39
  40             // PartialEq
  41             assert_eq!(*e1 == *e2, eq);
  42             assert_eq!(*e1 != *e2, !eq);
  43
  44             // PartialOrd
  45             assert_eq!(*e1 < *e2, lt);
  46             assert_eq!(*e1 > *e2, gt);
  47
  48             assert_eq!(*e1 <= *e2, le);
  49             assert_eq!(*e1 >= *e2, ge);
  50
  51             // Ord
  52             assert_eq!(e1.cmp(e2), ord);
  53         }
  54     }
  55 }