45 lines
1.1 KiB
Rust
45 lines
1.1 KiB
Rust
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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![allow(dead_code)]
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// check dtor calling order when casting enums.
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use std::sync::atomic;
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use std::sync::atomic::Ordering;
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use std::mem;
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enum E {
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A = 0,
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B = 1,
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C = 2
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}
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static FLAG: atomic::AtomicUsize = atomic::ATOMIC_USIZE_INIT;
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impl Drop for E {
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fn drop(&mut self) {
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// avoid dtor loop
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unsafe { mem::forget(mem::replace(self, E::B)) };
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FLAG.store(FLAG.load(Ordering::SeqCst)+1, Ordering::SeqCst);
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}
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}
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fn main() {
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assert_eq!(FLAG.load(Ordering::SeqCst), 0);
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{
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let e = E::C;
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assert_eq!(e as u32, 2);
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assert_eq!(FLAG.load(Ordering::SeqCst), 0);
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}
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assert_eq!(FLAG.load(Ordering::SeqCst), 1);
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}
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