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[rustc.git] / src / test / run-pass / resource-destruct.rs
1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
4 //
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
10
11 use std::cell::Cell;
12
13 struct shrinky_pointer<'a> {
14 i: &'a Cell<isize>,
15 }
16
17 impl<'a> Drop for shrinky_pointer<'a> {
18 fn drop(&mut self) {
19 println!("Hello!"); self.i.set(self.i.get() - 1);
20 }
21 }
22
23 impl<'a> shrinky_pointer<'a> {
24 pub fn look_at(&self) -> isize { return self.i.get(); }
25 }
26
27 fn shrinky_pointer(i: &Cell<isize>) -> shrinky_pointer {
28 shrinky_pointer {
29 i: i
30 }
31 }
32
33 pub fn main() {
34 let my_total = &Cell::new(10);
35 { let pt = shrinky_pointer(my_total); assert_eq!(pt.look_at(), 10); }
36 println!("my_total = {}", my_total.get());
37 assert_eq!(my_total.get(), 9);
38 }