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Commit | Line | Data |
---|---|---|
1b1a35ee | 1 | use core::cell::Cell; |
60c5eb7d XL |
2 | use core::clone::Clone; |
3 | use core::mem; | |
416331ca | 4 | use core::ops::DerefMut; |
60c5eb7d | 5 | use core::option::*; |
1a4d82fc JJ |
6 | |
7 | #[test] | |
8 | fn test_get_ptr() { | |
9 | unsafe { | |
c34b1796 AL |
10 | let x: Box<_> = box 0; |
11 | let addr_x: *const isize = mem::transmute(&*x); | |
1a4d82fc JJ |
12 | let opt = Some(x); |
13 | let y = opt.unwrap(); | |
c34b1796 | 14 | let addr_y: *const isize = mem::transmute(&*y); |
1a4d82fc JJ |
15 | assert_eq!(addr_x, addr_y); |
16 | } | |
17 | } | |
18 | ||
19 | #[test] | |
20 | fn test_get_str() { | |
21 | let x = "test".to_string(); | |
22 | let addr_x = x.as_ptr(); | |
23 | let opt = Some(x); | |
24 | let y = opt.unwrap(); | |
25 | let addr_y = y.as_ptr(); | |
26 | assert_eq!(addr_x, addr_y); | |
27 | } | |
28 | ||
29 | #[test] | |
30 | fn test_get_resource() { | |
1a4d82fc | 31 | use core::cell::RefCell; |
60c5eb7d | 32 | use std::rc::Rc; |
1a4d82fc JJ |
33 | |
34 | struct R { | |
60c5eb7d | 35 | i: Rc<RefCell<isize>>, |
1a4d82fc JJ |
36 | } |
37 | ||
60c5eb7d XL |
38 | impl Drop for R { |
39 | fn drop(&mut self) { | |
1a4d82fc JJ |
40 | let ii = &*self.i; |
41 | let i = *ii.borrow(); | |
42 | *ii.borrow_mut() = i + 1; | |
43 | } | |
44 | } | |
45 | ||
c34b1796 | 46 | fn r(i: Rc<RefCell<isize>>) -> R { |
60c5eb7d | 47 | R { i } |
1a4d82fc JJ |
48 | } |
49 | ||
85aaf69f | 50 | let i = Rc::new(RefCell::new(0)); |
1a4d82fc JJ |
51 | { |
52 | let x = r(i.clone()); | |
53 | let opt = Some(x); | |
54 | let _y = opt.unwrap(); | |
55 | } | |
56 | assert_eq!(*i.borrow(), 1); | |
57 | } | |
58 | ||
59 | #[test] | |
60 | fn test_option_dance() { | |
61 | let x = Some(()); | |
85aaf69f | 62 | let mut y = Some(5); |
1a4d82fc | 63 | let mut y2 = 0; |
62682a34 | 64 | for _x in x { |
1a4d82fc JJ |
65 | y2 = y.take().unwrap(); |
66 | } | |
67 | assert_eq!(y2, 5); | |
68 | assert!(y.is_none()); | |
69 | } | |
70 | ||
60c5eb7d XL |
71 | #[test] |
72 | #[should_panic] | |
1a4d82fc | 73 | fn test_option_too_much_dance() { |
62682a34 SL |
74 | struct A; |
75 | let mut y = Some(A); | |
1a4d82fc JJ |
76 | let _y2 = y.take().unwrap(); |
77 | let _y3 = y.take().unwrap(); | |
78 | } | |
79 | ||
80 | #[test] | |
81 | fn test_and() { | |
c34b1796 | 82 | let x: Option<isize> = Some(1); |
85aaf69f | 83 | assert_eq!(x.and(Some(2)), Some(2)); |
c34b1796 | 84 | assert_eq!(x.and(None::<isize>), None); |
1a4d82fc | 85 | |
c34b1796 | 86 | let x: Option<isize> = None; |
85aaf69f | 87 | assert_eq!(x.and(Some(2)), None); |
c34b1796 | 88 | assert_eq!(x.and(None::<isize>), None); |
1a4d82fc JJ |
89 | } |
90 | ||
91 | #[test] | |
92 | fn test_and_then() { | |
c34b1796 | 93 | let x: Option<isize> = Some(1); |
1a4d82fc | 94 | assert_eq!(x.and_then(|x| Some(x + 1)), Some(2)); |
c34b1796 | 95 | assert_eq!(x.and_then(|_| None::<isize>), None); |
1a4d82fc | 96 | |
c34b1796 | 97 | let x: Option<isize> = None; |
1a4d82fc | 98 | assert_eq!(x.and_then(|x| Some(x + 1)), None); |
c34b1796 | 99 | assert_eq!(x.and_then(|_| None::<isize>), None); |
1a4d82fc JJ |
100 | } |
101 | ||
102 | #[test] | |
103 | fn test_or() { | |
c34b1796 | 104 | let x: Option<isize> = Some(1); |
1a4d82fc JJ |
105 | assert_eq!(x.or(Some(2)), Some(1)); |
106 | assert_eq!(x.or(None), Some(1)); | |
107 | ||
c34b1796 | 108 | let x: Option<isize> = None; |
1a4d82fc JJ |
109 | assert_eq!(x.or(Some(2)), Some(2)); |
110 | assert_eq!(x.or(None), None); | |
111 | } | |
112 | ||
113 | #[test] | |
114 | fn test_or_else() { | |
c34b1796 | 115 | let x: Option<isize> = Some(1); |
1a4d82fc JJ |
116 | assert_eq!(x.or_else(|| Some(2)), Some(1)); |
117 | assert_eq!(x.or_else(|| None), Some(1)); | |
118 | ||
c34b1796 | 119 | let x: Option<isize> = None; |
1a4d82fc JJ |
120 | assert_eq!(x.or_else(|| Some(2)), Some(2)); |
121 | assert_eq!(x.or_else(|| None), None); | |
122 | } | |
123 | ||
124 | #[test] | |
125 | fn test_unwrap() { | |
85aaf69f | 126 | assert_eq!(Some(1).unwrap(), 1); |
1a4d82fc JJ |
127 | let s = Some("hello".to_string()).unwrap(); |
128 | assert_eq!(s, "hello"); | |
129 | } | |
130 | ||
131 | #[test] | |
c34b1796 | 132 | #[should_panic] |
1a4d82fc | 133 | fn test_unwrap_panic1() { |
c34b1796 | 134 | let x: Option<isize> = None; |
1a4d82fc JJ |
135 | x.unwrap(); |
136 | } | |
137 | ||
138 | #[test] | |
c34b1796 | 139 | #[should_panic] |
1a4d82fc JJ |
140 | fn test_unwrap_panic2() { |
141 | let x: Option<String> = None; | |
142 | x.unwrap(); | |
143 | } | |
144 | ||
145 | #[test] | |
146 | fn test_unwrap_or() { | |
c34b1796 | 147 | let x: Option<isize> = Some(1); |
1a4d82fc JJ |
148 | assert_eq!(x.unwrap_or(2), 1); |
149 | ||
c34b1796 | 150 | let x: Option<isize> = None; |
1a4d82fc JJ |
151 | assert_eq!(x.unwrap_or(2), 2); |
152 | } | |
153 | ||
154 | #[test] | |
155 | fn test_unwrap_or_else() { | |
c34b1796 | 156 | let x: Option<isize> = Some(1); |
1a4d82fc JJ |
157 | assert_eq!(x.unwrap_or_else(|| 2), 1); |
158 | ||
c34b1796 | 159 | let x: Option<isize> = None; |
1a4d82fc JJ |
160 | assert_eq!(x.unwrap_or_else(|| 2), 2); |
161 | } | |
162 | ||
163 | #[test] | |
164 | fn test_iter() { | |
85aaf69f | 165 | let val = 5; |
1a4d82fc JJ |
166 | |
167 | let x = Some(val); | |
168 | let mut it = x.iter(); | |
169 | ||
170 | assert_eq!(it.size_hint(), (1, Some(1))); | |
171 | assert_eq!(it.next(), Some(&val)); | |
172 | assert_eq!(it.size_hint(), (0, Some(0))); | |
173 | assert!(it.next().is_none()); | |
e9174d1e SL |
174 | |
175 | let mut it = (&x).into_iter(); | |
176 | assert_eq!(it.next(), Some(&val)); | |
1a4d82fc JJ |
177 | } |
178 | ||
179 | #[test] | |
180 | fn test_mut_iter() { | |
e9174d1e | 181 | let mut val = 5; |
85aaf69f | 182 | let new_val = 11; |
1a4d82fc JJ |
183 | |
184 | let mut x = Some(val); | |
185 | { | |
186 | let mut it = x.iter_mut(); | |
187 | ||
188 | assert_eq!(it.size_hint(), (1, Some(1))); | |
189 | ||
190 | match it.next() { | |
191 | Some(interior) => { | |
192 | assert_eq!(*interior, val); | |
193 | *interior = new_val; | |
194 | } | |
195 | None => assert!(false), | |
196 | } | |
197 | ||
198 | assert_eq!(it.size_hint(), (0, Some(0))); | |
199 | assert!(it.next().is_none()); | |
200 | } | |
201 | assert_eq!(x, Some(new_val)); | |
e9174d1e SL |
202 | |
203 | let mut y = Some(val); | |
204 | let mut it = (&mut y).into_iter(); | |
205 | assert_eq!(it.next(), Some(&mut val)); | |
1a4d82fc JJ |
206 | } |
207 | ||
208 | #[test] | |
209 | fn test_ord() { | |
210 | let small = Some(1.0f64); | |
211 | let big = Some(5.0f64); | |
60c5eb7d | 212 | let nan = Some(0.0f64 / 0.0); |
1a4d82fc JJ |
213 | assert!(!(nan < big)); |
214 | assert!(!(nan > big)); | |
215 | assert!(small < big); | |
216 | assert!(None < big); | |
217 | assert!(big > None); | |
218 | } | |
219 | ||
1a4d82fc JJ |
220 | #[test] |
221 | fn test_collect() { | |
c34b1796 | 222 | let v: Option<Vec<isize>> = (0..0).map(|_| Some(0)).collect(); |
1a4d82fc JJ |
223 | assert!(v == Some(vec![])); |
224 | ||
c34b1796 | 225 | let v: Option<Vec<isize>> = (0..3).map(|x| Some(x)).collect(); |
1a4d82fc JJ |
226 | assert!(v == Some(vec![0, 1, 2])); |
227 | ||
60c5eb7d | 228 | let v: Option<Vec<isize>> = (0..3).map(|x| if x > 1 { None } else { Some(x) }).collect(); |
1a4d82fc JJ |
229 | assert!(v == None); |
230 | ||
231 | // test that it does not take more elements than it needs | |
8faf50e0 | 232 | let mut functions: [Box<dyn Fn() -> Option<()>>; 3] = |
1a4d82fc JJ |
233 | [box || Some(()), box || None, box || panic!()]; |
234 | ||
235 | let v: Option<Vec<()>> = functions.iter_mut().map(|f| (*f)()).collect(); | |
236 | ||
237 | assert!(v == None); | |
238 | } | |
d9579d0f | 239 | |
0731742a XL |
240 | #[test] |
241 | fn test_copied() { | |
242 | let val = 1; | |
243 | let val_ref = &val; | |
244 | let opt_none: Option<&'static u32> = None; | |
245 | let opt_ref = Some(&val); | |
246 | let opt_ref_ref = Some(&val_ref); | |
247 | ||
248 | // None works | |
249 | assert_eq!(opt_none.clone(), None); | |
250 | assert_eq!(opt_none.copied(), None); | |
251 | ||
252 | // Immutable ref works | |
253 | assert_eq!(opt_ref.clone(), Some(&val)); | |
254 | assert_eq!(opt_ref.copied(), Some(1)); | |
255 | ||
256 | // Double Immutable ref works | |
257 | assert_eq!(opt_ref_ref.clone(), Some(&val_ref)); | |
258 | assert_eq!(opt_ref_ref.clone().copied(), Some(&val)); | |
259 | assert_eq!(opt_ref_ref.copied().copied(), Some(1)); | |
260 | } | |
1a4d82fc JJ |
261 | |
262 | #[test] | |
263 | fn test_cloned() { | |
54a0048b | 264 | let val = 1; |
d9579d0f | 265 | let val_ref = &val; |
1a4d82fc | 266 | let opt_none: Option<&'static u32> = None; |
d9579d0f AL |
267 | let opt_ref = Some(&val); |
268 | let opt_ref_ref = Some(&val_ref); | |
1a4d82fc JJ |
269 | |
270 | // None works | |
271 | assert_eq!(opt_none.clone(), None); | |
272 | assert_eq!(opt_none.cloned(), None); | |
273 | ||
1a4d82fc | 274 | // Immutable ref works |
d9579d0f | 275 | assert_eq!(opt_ref.clone(), Some(&val)); |
54a0048b | 276 | assert_eq!(opt_ref.cloned(), Some(1)); |
1a4d82fc JJ |
277 | |
278 | // Double Immutable ref works | |
d9579d0f AL |
279 | assert_eq!(opt_ref_ref.clone(), Some(&val_ref)); |
280 | assert_eq!(opt_ref_ref.clone().cloned(), Some(&val)); | |
54a0048b | 281 | assert_eq!(opt_ref_ref.cloned().cloned(), Some(1)); |
1a4d82fc | 282 | } |
ea8adc8c XL |
283 | |
284 | #[test] | |
285 | fn test_try() { | |
286 | fn try_option_some() -> Option<u8> { | |
287 | let val = Some(1)?; | |
288 | Some(val) | |
289 | } | |
290 | assert_eq!(try_option_some(), Some(1)); | |
291 | ||
292 | fn try_option_none() -> Option<u8> { | |
293 | let val = None?; | |
294 | Some(val) | |
295 | } | |
296 | assert_eq!(try_option_none(), None); | |
297 | ||
298 | fn try_option_ok() -> Result<u8, NoneError> { | |
299 | let val = Some(1)?; | |
300 | Ok(val) | |
301 | } | |
302 | assert_eq!(try_option_ok(), Ok(1)); | |
303 | ||
304 | fn try_option_err() -> Result<u8, NoneError> { | |
305 | let val = None?; | |
306 | Ok(val) | |
307 | } | |
308 | assert_eq!(try_option_err(), Err(NoneError)); | |
309 | } | |
8faf50e0 | 310 | |
b7449926 | 311 | #[test] |
416331ca | 312 | fn test_option_as_deref() { |
b7449926 XL |
313 | // Some: &Option<T: Deref>::Some(T) -> Option<&T::Deref::Target>::Some(&*T) |
314 | let ref_option = &Some(&42); | |
416331ca | 315 | assert_eq!(ref_option.as_deref(), Some(&42)); |
b7449926 XL |
316 | |
317 | let ref_option = &Some(String::from("a result")); | |
416331ca | 318 | assert_eq!(ref_option.as_deref(), Some("a result")); |
b7449926 XL |
319 | |
320 | let ref_option = &Some(vec![1, 2, 3, 4, 5]); | |
416331ca | 321 | assert_eq!(ref_option.as_deref(), Some([1, 2, 3, 4, 5].as_slice())); |
b7449926 XL |
322 | |
323 | // None: &Option<T: Deref>>::None -> None | |
324 | let ref_option: &Option<&i32> = &None; | |
416331ca XL |
325 | assert_eq!(ref_option.as_deref(), None); |
326 | } | |
327 | ||
328 | #[test] | |
329 | fn test_option_as_deref_mut() { | |
330 | // Some: &mut Option<T: Deref>::Some(T) -> Option<&mut T::Deref::Target>::Some(&mut *T) | |
331 | let mut val = 42; | |
332 | let ref_option = &mut Some(&mut val); | |
333 | assert_eq!(ref_option.as_deref_mut(), Some(&mut 42)); | |
334 | ||
335 | let ref_option = &mut Some(String::from("a result")); | |
336 | assert_eq!(ref_option.as_deref_mut(), Some(String::from("a result").deref_mut())); | |
337 | ||
338 | let ref_option = &mut Some(vec![1, 2, 3, 4, 5]); | |
339 | assert_eq!(ref_option.as_deref_mut(), Some([1, 2, 3, 4, 5].as_mut_slice())); | |
340 | ||
341 | // None: &mut Option<T: Deref>>::None -> None | |
342 | let ref_option: &mut Option<&mut i32> = &mut None; | |
343 | assert_eq!(ref_option.as_deref_mut(), None); | |
b7449926 XL |
344 | } |
345 | ||
8faf50e0 XL |
346 | #[test] |
347 | fn test_replace() { | |
348 | let mut x = Some(2); | |
349 | let old = x.replace(5); | |
350 | ||
351 | assert_eq!(x, Some(5)); | |
352 | assert_eq!(old, Some(2)); | |
353 | ||
354 | let mut x = None; | |
355 | let old = x.replace(3); | |
356 | ||
357 | assert_eq!(x, Some(3)); | |
358 | assert_eq!(old, None); | |
359 | } | |
1b1a35ee XL |
360 | |
361 | #[test] | |
362 | fn option_const() { | |
363 | // test that the methods of `Option` are usable in a const context | |
364 | ||
365 | const OPTION: Option<usize> = Some(32); | |
366 | ||
367 | const REF: Option<&usize> = OPTION.as_ref(); | |
368 | assert_eq!(REF, Some(&32)); | |
369 | ||
370 | const IS_SOME: bool = OPTION.is_some(); | |
371 | assert!(IS_SOME); | |
372 | ||
373 | const IS_NONE: bool = OPTION.is_none(); | |
374 | assert!(!IS_NONE); | |
375 | } | |
376 | ||
377 | #[test] | |
378 | fn test_unwrap_drop() { | |
379 | struct Dtor<'a> { | |
380 | x: &'a Cell<isize>, | |
381 | } | |
382 | ||
383 | impl<'a> std::ops::Drop for Dtor<'a> { | |
384 | fn drop(&mut self) { | |
385 | self.x.set(self.x.get() - 1); | |
386 | } | |
387 | } | |
388 | ||
389 | fn unwrap<T>(o: Option<T>) -> T { | |
390 | match o { | |
391 | Some(v) => v, | |
392 | None => panic!(), | |
393 | } | |
394 | } | |
395 | ||
396 | let x = &Cell::new(1); | |
397 | ||
398 | { | |
399 | let b = Some(Dtor { x }); | |
400 | let _c = unwrap(b); | |
401 | } | |
402 | ||
403 | assert_eq!(x.get(), 0); | |
404 | } |