100 lines
1.8 KiB
Rust
100 lines
1.8 KiB
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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use std::gc::{Gc, GC};
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// Resources can't be copied, but storing into data structures counts
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// as a move unless the stored thing is used afterwards.
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struct r {
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i: Gc<Cell<int>>,
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}
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struct Box { x: r }
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#[unsafe_destructor]
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impl Drop for r {
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fn drop(&mut self) {
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self.i.set(self.i.get() + 1)
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}
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}
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fn r(i: Gc<Cell<int>>) -> r {
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r {
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i: i
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}
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}
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fn test_box() {
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let i = box(GC) Cell::new(0i);
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{
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let _a = box(GC) r(i);
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}
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assert_eq!(i.get(), 1);
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}
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fn test_rec() {
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let i = box(GC) Cell::new(0i);
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{
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let _a = Box {x: r(i)};
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}
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assert_eq!(i.get(), 1);
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}
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fn test_tag() {
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enum t {
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t0(r),
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}
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let i = box(GC) Cell::new(0i);
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{
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let _a = t0(r(i));
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}
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assert_eq!(i.get(), 1);
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}
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fn test_tup() {
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let i = box(GC) Cell::new(0i);
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{
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let _a = (r(i), 0i);
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}
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assert_eq!(i.get(), 1);
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}
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fn test_unique() {
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let i = box(GC) Cell::new(0i);
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{
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let _a = box r(i);
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}
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assert_eq!(i.get(), 1);
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}
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fn test_box_rec() {
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let i = box(GC) Cell::new(0i);
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{
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let _a = box(GC) Box {
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x: r(i)
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};
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}
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assert_eq!(i.get(), 1);
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}
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pub fn main() {
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test_box();
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test_rec();
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test_tag();
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test_tup();
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test_unique();
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test_box_rec();
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}
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