40 lines
852 B
Rust
40 lines
852 B
Rust
// Copyright 2012 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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#![feature(unsafe_destructor)]
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use std::cell::Cell;
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struct r<'a> {
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b: &'a Cell<int>,
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}
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#[unsafe_destructor]
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impl<'a> Drop for r<'a> {
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fn drop(&mut self) {
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self.b.set(self.b.get() + 1);
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}
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}
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fn r(b: &Cell<int>) -> r {
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r {
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b: b
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}
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}
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pub fn main() {
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let b = &Cell::new(0);
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{
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let _p = Some(r(b));
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}
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assert_eq!(b.get(), 1);
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}
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