1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#[deriving(Eq, TotalEq, Ord, TotalOrd)]
enum E<T> {
E0,
E1(T),
E2(T,T)
}
pub fn main() {
let e0 = E0;
let e11 = E1(1);
let e12 = E1(2);
let e21 = E2(1, 1);
let e22 = E2(1, 2);
// in order for both Ord and TotalOrd
let es = [e0, e11, e12, e21, e22];
for (i, e1) in es.iter().enumerate() {
for (j, e2) in es.iter().enumerate() {
let ord = i.cmp(&j);
let eq = i == j;
let lt = i < j;
let le = i <= j;
let gt = i > j;
let ge = i >= j;
// Eq
assert_eq!(*e1 == *e2, eq);
assert_eq!(*e1 != *e2, !eq);
// Ord
assert_eq!(*e1 < *e2, lt);
assert_eq!(*e1 > *e2, gt);
assert_eq!(*e1 <= *e2, le);
assert_eq!(*e1 >= *e2, ge);
// TotalOrd
assert_eq!(e1.cmp(e2), ord);
}
}
}
|
