src/test/run-pass-valgrind/cast-enum-with-dtor.rs

   1 // no-prefer-dynamic
   2
   3 #![allow(dead_code)]
   4
   5 // check dtor calling order when casting enums.
   6
   7 use std::sync::atomic;
   8 use std::sync::atomic::Ordering;
   9 use std::mem;
  10
  11 enum E {
  12     A = 0,
  13     B = 1,
  14     C = 2
  15 }
  16
  17 static FLAG: atomic::AtomicUsize = atomic::AtomicUsize::new(0);
  18
  19 impl Drop for E {
  20     fn drop(&mut self) {
  21         // avoid dtor loop
  22         unsafe { mem::forget(mem::replace(self, E::B)) };
  23
  24         FLAG.store(FLAG.load(Ordering::SeqCst)+1, Ordering::SeqCst);
  25     }
  26 }
  27
  28 fn main() {
  29     assert_eq!(FLAG.load(Ordering::SeqCst), 0);
  30     {
  31         let e = E::C;
  32         assert_eq!(e as u32, 2);
  33         assert_eq!(FLAG.load(Ordering::SeqCst), 0);
  34     }
  35     assert_eq!(FLAG.load(Ordering::SeqCst), 0);
  36 }