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Add some unit tests for dangling Weak references
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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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use std::any::Any; | ||
use std::sync::{Arc, Weak}; | ||
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#[test] | ||
fn uninhabited() { | ||
enum Void {} | ||
let mut a = Weak::<Void>::new(); | ||
a = a.clone(); | ||
assert!(a.upgrade().is_none()); | ||
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let mut a: Weak<Any> = a; // Unsizing | ||
a = a.clone(); | ||
assert!(a.upgrade().is_none()); | ||
} | ||
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#[test] | ||
fn slice() { | ||
let a: Arc<[u32; 3]> = Arc::new([3, 2, 1]); | ||
let a: Arc<[u32]> = a; // Unsizing | ||
let b: Arc<[u32]> = Arc::from(&[3, 2, 1][..]); // Conversion | ||
assert_eq!(a, b); | ||
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// Exercise is_dangling() with a DST | ||
let mut a = Arc::downgrade(&a); | ||
a = a.clone(); | ||
assert!(a.upgrade().is_some()); | ||
} | ||
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#[test] | ||
fn trait_object() { | ||
let a: Arc<u32> = Arc::new(4); | ||
let a: Arc<Any> = a; // Unsizing | ||
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// Exercise is_dangling() with a DST | ||
let mut a = Arc::downgrade(&a); | ||
a = a.clone(); | ||
assert!(a.upgrade().is_some()); | ||
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let mut b = Weak::<u32>::new(); | ||
b = b.clone(); | ||
assert!(b.upgrade().is_none()); | ||
let mut b: Weak<Any> = b; // Unsizing | ||
b = b.clone(); | ||
assert!(b.upgrade().is_none()); | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,55 @@ | ||
// Copyright 2018 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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use std::any::Any; | ||
use std::rc::{Rc, Weak}; | ||
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#[test] | ||
fn uninhabited() { | ||
enum Void {} | ||
let mut a = Weak::<Void>::new(); | ||
a = a.clone(); | ||
assert!(a.upgrade().is_none()); | ||
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let mut a: Weak<Any> = a; // Unsizing | ||
a = a.clone(); | ||
assert!(a.upgrade().is_none()); | ||
} | ||
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#[test] | ||
fn slice() { | ||
let a: Rc<[u32; 3]> = Rc::new([3, 2, 1]); | ||
let a: Rc<[u32]> = a; // Unsizing | ||
let b: Rc<[u32]> = Rc::from(&[3, 2, 1][..]); // Conversion | ||
assert_eq!(a, b); | ||
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// Exercise is_dangling() with a DST | ||
let mut a = Rc::downgrade(&a); | ||
a = a.clone(); | ||
assert!(a.upgrade().is_some()); | ||
} | ||
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#[test] | ||
fn trait_object() { | ||
let a: Rc<u32> = Rc::new(4); | ||
let a: Rc<Any> = a; // Unsizing | ||
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// Exercise is_dangling() with a DST | ||
let mut a = Rc::downgrade(&a); | ||
a = a.clone(); | ||
assert!(a.upgrade().is_some()); | ||
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let mut b = Weak::<u32>::new(); | ||
b = b.clone(); | ||
assert!(b.upgrade().is_none()); | ||
let mut b: Weak<Any> = b; // Unsizing | ||
b = b.clone(); | ||
assert!(b.upgrade().is_none()); | ||
} |