4 use std::cell::RefCell;
6 use std::convert::{From, TryInto};
8 use std::option::Option::{self, None, Some};
9 use std::result::Result::{Err, Ok};
13 let x = Rc::new(RefCell::new(5));
16 assert_eq!(*y.borrow(), 20);
26 fn test_simple_clone() {
34 fn test_destructor() {
35 let x: Rc<Box<_>> = Rc::new(box 5);
42 let y = Rc::downgrade(&x);
43 assert!(y.upgrade().is_some());
49 let y = Rc::downgrade(&x);
51 assert!(y.upgrade().is_none());
55 fn weak_self_cyclic() {
57 x: RefCell<Option<Weak<Cycle>>>,
60 let a = Rc::new(Cycle { x: RefCell::new(None) });
61 let b = Rc::downgrade(&a.clone());
62 *a.x.borrow_mut() = Some(b);
64 // hopefully we don't double-free (or leak)...
70 assert!(Rc::is_unique(&x));
72 assert!(!Rc::is_unique(&x));
74 assert!(Rc::is_unique(&x));
75 let w = Rc::downgrade(&x);
76 assert!(!Rc::is_unique(&x));
78 assert!(Rc::is_unique(&x));
82 fn test_strong_count() {
84 assert!(Rc::strong_count(&a) == 1);
85 let w = Rc::downgrade(&a);
86 assert!(Rc::strong_count(&a) == 1);
87 let b = w.upgrade().expect("upgrade of live rc failed");
88 assert!(Rc::strong_count(&b) == 2);
89 assert!(Rc::strong_count(&a) == 2);
92 assert!(Rc::strong_count(&b) == 1);
94 assert!(Rc::strong_count(&b) == 2);
95 assert!(Rc::strong_count(&c) == 2);
99 fn test_weak_count() {
101 assert!(Rc::strong_count(&a) == 1);
102 assert!(Rc::weak_count(&a) == 0);
103 let w = Rc::downgrade(&a);
104 assert!(Rc::strong_count(&a) == 1);
105 assert!(Rc::weak_count(&a) == 1);
107 assert!(Rc::strong_count(&a) == 1);
108 assert!(Rc::weak_count(&a) == 0);
110 assert!(Rc::strong_count(&a) == 2);
111 assert!(Rc::weak_count(&a) == 0);
117 assert_eq!(Weak::weak_count(&Weak::<u64>::new()), 0);
118 assert_eq!(Weak::strong_count(&Weak::<u64>::new()), 0);
121 let w = Rc::downgrade(&a);
122 assert_eq!(Weak::strong_count(&w), 1);
123 assert_eq!(Weak::weak_count(&w), 1);
125 assert_eq!(Weak::strong_count(&w), 1);
126 assert_eq!(Weak::weak_count(&w), 2);
127 assert_eq!(Weak::strong_count(&w2), 1);
128 assert_eq!(Weak::weak_count(&w2), 2);
130 assert_eq!(Weak::strong_count(&w2), 1);
131 assert_eq!(Weak::weak_count(&w2), 1);
133 assert_eq!(Weak::strong_count(&w2), 2);
134 assert_eq!(Weak::weak_count(&w2), 1);
137 assert_eq!(Weak::strong_count(&w2), 0);
138 assert_eq!(Weak::weak_count(&w2), 0);
145 assert_eq!(Rc::try_unwrap(x), Ok(3));
148 assert_eq!(Rc::try_unwrap(x), Err(Rc::new(4)));
150 let _w = Rc::downgrade(&x);
151 assert_eq!(Rc::try_unwrap(x), Ok(5));
156 let x = Rc::new(box "hello");
159 let x_ptr = Rc::into_raw(x);
162 assert_eq!(**x_ptr, "hello");
164 let x = Rc::from_raw(x_ptr);
165 assert_eq!(**x, "hello");
167 assert_eq!(Rc::try_unwrap(x).map(|x| *x), Ok("hello"));
172 fn test_into_from_raw_unsized() {
173 use std::fmt::Display;
174 use std::string::ToString;
176 let rc: Rc<str> = Rc::from("foo");
178 let ptr = Rc::into_raw(rc.clone());
179 let rc2 = unsafe { Rc::from_raw(ptr) };
181 assert_eq!(unsafe { &*ptr }, "foo");
184 let rc: Rc<dyn Display> = Rc::new(123);
186 let ptr = Rc::into_raw(rc.clone());
187 let rc2 = unsafe { Rc::from_raw(ptr) };
189 assert_eq!(unsafe { &*ptr }.to_string(), "123");
190 assert_eq!(rc2.to_string(), "123");
195 let mut x = Rc::new(3);
196 *Rc::get_mut(&mut x).unwrap() = 4;
199 assert!(Rc::get_mut(&mut x).is_none());
201 assert!(Rc::get_mut(&mut x).is_some());
202 let _w = Rc::downgrade(&x);
203 assert!(Rc::get_mut(&mut x).is_none());
207 fn test_cowrc_clone_make_unique() {
208 let mut cow0 = Rc::new(75);
209 let mut cow1 = cow0.clone();
210 let mut cow2 = cow1.clone();
212 assert!(75 == *Rc::make_mut(&mut cow0));
213 assert!(75 == *Rc::make_mut(&mut cow1));
214 assert!(75 == *Rc::make_mut(&mut cow2));
216 *Rc::make_mut(&mut cow0) += 1;
217 *Rc::make_mut(&mut cow1) += 2;
218 *Rc::make_mut(&mut cow2) += 3;
220 assert!(76 == *cow0);
221 assert!(77 == *cow1);
222 assert!(78 == *cow2);
224 // none should point to the same backing memory
225 assert!(*cow0 != *cow1);
226 assert!(*cow0 != *cow2);
227 assert!(*cow1 != *cow2);
231 fn test_cowrc_clone_unique2() {
232 let mut cow0 = Rc::new(75);
233 let cow1 = cow0.clone();
234 let cow2 = cow1.clone();
236 assert!(75 == *cow0);
237 assert!(75 == *cow1);
238 assert!(75 == *cow2);
240 *Rc::make_mut(&mut cow0) += 1;
242 assert!(76 == *cow0);
243 assert!(75 == *cow1);
244 assert!(75 == *cow2);
246 // cow1 and cow2 should share the same contents
247 // cow0 should have a unique reference
248 assert!(*cow0 != *cow1);
249 assert!(*cow0 != *cow2);
250 assert!(*cow1 == *cow2);
254 fn test_cowrc_clone_weak() {
255 let mut cow0 = Rc::new(75);
256 let cow1_weak = Rc::downgrade(&cow0);
258 assert!(75 == *cow0);
259 assert!(75 == *cow1_weak.upgrade().unwrap());
261 *Rc::make_mut(&mut cow0) += 1;
263 assert!(76 == *cow0);
264 assert!(cow1_weak.upgrade().is_none());
269 let foo = Rc::new(75);
270 assert_eq!(format!("{:?}", foo), "75");
275 let foo: Rc<[i32]> = Rc::new([1, 2, 3]);
276 assert_eq!(foo, foo.clone());
280 fn test_from_owned() {
282 let foo_rc = Rc::from(foo);
283 assert!(123 == *foo_rc);
288 let foo: Weak<usize> = Weak::new();
289 assert!(foo.upgrade().is_none());
294 let five = Rc::new(5);
295 let same_five = five.clone();
296 let other_five = Rc::new(5);
298 assert!(Rc::ptr_eq(&five, &same_five));
299 assert!(!Rc::ptr_eq(&five, &other_five));
304 let r: Rc<str> = Rc::from("foo");
306 assert_eq!(&r[..], "foo");
310 fn test_copy_from_slice() {
311 let s: &[u32] = &[1, 2, 3];
312 let r: Rc<[u32]> = Rc::from(s);
314 assert_eq!(&r[..], [1, 2, 3]);
318 fn test_clone_from_slice() {
319 #[derive(Clone, Debug, Eq, PartialEq)]
322 let s: &[X] = &[X(1), X(2), X(3)];
323 let r: Rc<[X]> = Rc::from(s);
325 assert_eq!(&r[..], s);
330 fn test_clone_from_slice_panic() {
331 use std::string::{String, ToString};
333 struct Fail(u32, String);
335 impl Clone for Fail {
336 fn clone(&self) -> Fail {
340 Fail(self.0, self.1.clone())
345 &[Fail(0, "foo".to_string()), Fail(1, "bar".to_string()), Fail(2, "baz".to_string())];
347 // Should panic, but not cause memory corruption
348 let _r: Rc<[Fail]> = Rc::from(s);
353 let b: Box<u32> = box 123;
354 let r: Rc<u32> = Rc::from(b);
360 fn test_from_box_str() {
361 use std::string::String;
363 let s = String::from("foo").into_boxed_str();
364 let r: Rc<str> = Rc::from(s);
366 assert_eq!(&r[..], "foo");
370 fn test_from_box_slice() {
371 let s = vec![1, 2, 3].into_boxed_slice();
372 let r: Rc<[u32]> = Rc::from(s);
374 assert_eq!(&r[..], [1, 2, 3]);
378 fn test_from_box_trait() {
379 use std::fmt::Display;
380 use std::string::ToString;
382 let b: Box<dyn Display> = box 123;
383 let r: Rc<dyn Display> = Rc::from(b);
385 assert_eq!(r.to_string(), "123");
389 fn test_from_box_trait_zero_sized() {
392 let b: Box<dyn Debug> = box ();
393 let r: Rc<dyn Debug> = Rc::from(b);
395 assert_eq!(format!("{:?}", r), "()");
400 let v = vec![1, 2, 3];
401 let r: Rc<[u32]> = Rc::from(v);
403 assert_eq!(&r[..], [1, 2, 3]);
410 let r1: Rc<dyn Any> = Rc::new(i32::max_value());
411 let r2: Rc<dyn Any> = Rc::new("abc");
413 assert!(r1.clone().downcast::<u32>().is_err());
415 let r1i32 = r1.downcast::<i32>();
416 assert!(r1i32.is_ok());
417 assert_eq!(r1i32.unwrap(), Rc::new(i32::max_value()));
419 assert!(r2.clone().downcast::<i32>().is_err());
421 let r2str = r2.downcast::<&'static str>();
422 assert!(r2str.is_ok());
423 assert_eq!(r2str.unwrap(), Rc::new("abc"));
427 fn test_array_from_slice() {
428 let v = vec![1, 2, 3];
429 let r: Rc<[u32]> = Rc::from(v);
431 let a: Result<Rc<[u32; 3]>, _> = r.clone().try_into();
434 let a: Result<Rc<[u32; 2]>, _> = r.clone().try_into();