blob: f29bc50e84c4ea36322de62068f6d88dac3424e5 (
plain)
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
|
#![allow(dead_code, cenum_impl_drop_cast)]
// check dtor calling order when casting enums.
use std::sync::atomic;
use std::sync::atomic::Ordering;
use std::mem;
enum E {
A = 0,
B = 1,
C = 2
}
static FLAG: atomic::AtomicUsize = atomic::AtomicUsize::new(0);
impl Drop for E {
fn drop(&mut self) {
// avoid dtor loop
unsafe { mem::forget(mem::replace(self, E::B)) };
FLAG.store(FLAG.load(Ordering::SeqCst)+1, Ordering::SeqCst);
}
}
fn main() {
assert_eq!(FLAG.load(Ordering::SeqCst), 0);
{
let e = E::C;
assert_eq!(e as u32, 2);
assert_eq!(FLAG.load(Ordering::SeqCst), 0);
}
assert_eq!(FLAG.load(Ordering::SeqCst), 1);
}
|
