49 lines
1.3 KiB
Rust
49 lines
1.3 KiB
Rust
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// Copyright 2016 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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//! Test that #[derive(Copy, Clone)] produces a shallow copy
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//! even when a member violates RFC 1521
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use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT, Ordering};
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/// A struct that pretends to be Copy, but actually does something
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/// in its Clone impl
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#[derive(Copy)]
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struct Liar;
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/// Static cooperating with the rogue Clone impl
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static CLONED: AtomicBool = ATOMIC_BOOL_INIT;
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impl Clone for Liar {
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fn clone(&self) -> Self {
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// this makes Clone vs Copy observable
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CLONED.store(true, Ordering::SeqCst);
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*self
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}
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}
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/// This struct is actually Copy... at least, it thinks it is!
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#[derive(Copy, Clone)]
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struct Innocent(Liar);
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impl Innocent {
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fn new() -> Self {
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Innocent(Liar)
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}
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}
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fn main() {
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let _ = Innocent::new().clone();
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// if Innocent was byte-for-byte copied, CLONED will still be false
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assert!(!CLONED.load(Ordering::SeqCst));
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}
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