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
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
//@ run-pass
#![allow(stable_features)]
#![feature(core, core_intrinsics)]
extern crate core;
use core::intrinsics::discriminant_value;
enum CLike1 {
A,
B,
C,
D
}
enum CLike2 {
A = 5,
B = 2,
C = 19,
D
}
#[repr(i8)]
enum CLike3 {
A = 5,
B,
C = -1,
D
}
#[allow(dead_code)]
enum ADT {
First(u32, u32),
Second(u64)
}
enum NullablePointer {
Something(#[allow(dead_code)] &'static u32),
Nothing
}
static CONST : u32 = 0xBEEF;
#[allow(dead_code)]
#[repr(isize)]
enum Mixed {
Unit = 3,
Tuple(u16) = 2,
Struct {
a: u8,
b: u16,
} = 1,
}
pub fn main() {
assert_eq!(discriminant_value(&CLike1::A), 0isize);
assert_eq!(discriminant_value(&CLike1::B), 1);
assert_eq!(discriminant_value(&CLike1::C), 2);
assert_eq!(discriminant_value(&CLike1::D), 3);
assert_eq!(discriminant_value(&CLike2::A), 5isize);
assert_eq!(discriminant_value(&CLike2::B), 2);
assert_eq!(discriminant_value(&CLike2::C), 19);
assert_eq!(discriminant_value(&CLike2::D), 20);
assert_eq!(discriminant_value(&CLike3::A), 5i8);
assert_eq!(discriminant_value(&CLike3::B), 6);
assert_eq!(discriminant_value(&CLike3::C), -1);
assert_eq!(discriminant_value(&CLike3::D), 0);
assert_eq!(discriminant_value(&ADT::First(0,0)), 0isize);
assert_eq!(discriminant_value(&ADT::Second(5)), 1);
assert_eq!(discriminant_value(&NullablePointer::Nothing), 1isize);
assert_eq!(discriminant_value(&NullablePointer::Something(&CONST)), 0);
assert_eq!(discriminant_value(&10), 0u8);
assert_eq!(discriminant_value(&"test"), 0u8);
assert_eq!(discriminant_value(&Mixed::Unit), 3isize);
assert_eq!(discriminant_value(&Mixed::Tuple(5)), 2);
assert_eq!(discriminant_value(&Mixed::Struct{a: 7, b: 11}), 1);
}
|
