58 lines
1.2 KiB
Rust
58 lines
1.2 KiB
Rust
// Copyright 2014 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(unknown_features)]
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#![feature(box_syntax)]
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#![feature(box_patterns)]
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use std::ops::{Deref, DerefMut};
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struct X(Box<isize>);
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static mut DESTRUCTOR_RAN: bool = false;
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impl Drop for X {
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fn drop(&mut self) {
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unsafe {
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assert!(!DESTRUCTOR_RAN);
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DESTRUCTOR_RAN = true;
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}
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}
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}
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impl Deref for X {
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type Target = isize;
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fn deref(&self) -> &isize {
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let &X(box ref x) = self;
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x
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}
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}
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impl DerefMut for X {
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fn deref_mut(&mut self) -> &mut isize {
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let &mut X(box ref mut x) = self;
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x
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}
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}
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fn main() {
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{
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let mut test = X(box 5);
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{
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let mut change = || { *test = 10 };
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change();
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}
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assert_eq!(*test, 10);
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}
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assert!(unsafe { DESTRUCTOR_RAN });
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}
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