1 // Copyright 2014 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.
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.
12 use core::default::Default;
17 let x = Cell::new(10);
18 assert!(x == Cell::new(10));
19 assert!(x.get() == 10);
21 assert!(x == Cell::new(20));
22 assert!(x.get() == 20);
24 let y = Cell::new((30, 40));
25 assert!(y == Cell::new((30, 40)));
26 assert!(y.get() == (30, 40));
30 fn cell_has_sensible_show() {
31 let x = Cell::new("foo bar");
32 assert!(format!("{:?}", x).contains(x.get()));
35 assert!(format!("{:?}", x).contains(x.get()));
39 fn ref_and_refmut_have_sensible_show() {
40 let refcell = RefCell::new("foo");
42 let refcell_refmut = refcell.borrow_mut();
43 assert!(format!("{:?}", refcell_refmut).contains("foo"));
46 let refcell_ref = refcell.borrow();
47 assert!(format!("{:?}", refcell_ref).contains("foo"));
52 fn double_imm_borrow() {
53 let x = RefCell::new(0);
59 fn no_mut_then_imm_borrow() {
60 let x = RefCell::new(0);
61 let _b1 = x.borrow_mut();
62 assert!(x.try_borrow().is_err());
66 fn no_imm_then_borrow_mut() {
67 let x = RefCell::new(0);
69 assert!(x.try_borrow_mut().is_err());
73 fn no_double_borrow_mut() {
74 let x = RefCell::new(0);
75 assert!(x.try_borrow().is_ok());
76 let _b1 = x.borrow_mut();
77 assert!(x.try_borrow().is_err());
81 fn imm_release_borrow_mut() {
82 let x = RefCell::new(0);
90 fn mut_release_borrow_mut() {
91 let x = RefCell::new(0);
93 let _b1 = x.borrow_mut();
99 fn double_borrow_single_release_no_borrow_mut() {
100 let x = RefCell::new(0);
101 let _b1 = x.borrow();
103 let _b2 = x.borrow();
105 assert!(x.try_borrow().is_ok());
106 assert!(x.try_borrow_mut().is_err());
111 fn discard_doesnt_unborrow() {
112 let x = RefCell::new(0);
115 let _b = x.borrow_mut();
119 fn ref_clone_updates_flag() {
120 let x = RefCell::new(0);
123 assert!(x.try_borrow().is_ok());
124 assert!(x.try_borrow_mut().is_err());
126 let _b2 = Ref::clone(&b1);
127 assert!(x.try_borrow().is_ok());
128 assert!(x.try_borrow_mut().is_err());
130 assert!(x.try_borrow().is_ok());
131 assert!(x.try_borrow_mut().is_err());
133 assert!(x.try_borrow().is_ok());
134 assert!(x.try_borrow_mut().is_ok());
138 fn ref_map_does_not_update_flag() {
139 let x = RefCell::new(Some(5));
141 let b1: Ref<Option<u32>> = x.borrow();
142 assert!(x.try_borrow().is_ok());
143 assert!(x.try_borrow_mut().is_err());
145 let b2: Ref<u32> = Ref::map(b1, |o| o.as_ref().unwrap());
147 assert!(x.try_borrow().is_ok());
148 assert!(x.try_borrow_mut().is_err());
150 assert!(x.try_borrow().is_ok());
151 assert!(x.try_borrow_mut().is_ok());
153 assert!(x.try_borrow().is_ok());
154 assert!(x.try_borrow_mut().is_ok());
158 fn ref_map_accessor() {
159 struct X(RefCell<(u32, char)>);
161 fn accessor(&self) -> Ref<u32> {
162 Ref::map(self.0.borrow(), |tuple| &tuple.0)
165 let x = X(RefCell::new((7, 'z')));
166 let d: Ref<u32> = x.accessor();
171 fn ref_mut_map_accessor() {
172 struct X(RefCell<(u32, char)>);
174 fn accessor(&self) -> RefMut<u32> {
175 RefMut::map(self.0.borrow_mut(), |tuple| &mut tuple.0)
178 let x = X(RefCell::new((7, 'z')));
180 let mut d: RefMut<u32> = x.accessor();
184 assert_eq!(*x.0.borrow(), (8, 'z'));
189 let c1: Cell<usize> = Cell::new(0);
191 assert_eq!(1, unsafe { *c1.as_ptr() });
193 let c2: Cell<usize> = Cell::new(0);
194 unsafe { *c2.as_ptr() = 1; }
195 assert_eq!(1, c2.get());
197 let r1: RefCell<usize> = RefCell::new(0);
198 *r1.borrow_mut() = 1;
199 assert_eq!(1, unsafe { *r1.as_ptr() });
201 let r2: RefCell<usize> = RefCell::new(0);
202 unsafe { *r2.as_ptr() = 1; }
203 assert_eq!(1, *r2.borrow());
208 let cell: Cell<u32> = Default::default();
209 assert_eq!(0, cell.get());
214 let cell = Cell::new(10);
216 assert_eq!(20, cell.get());
218 let cell = Cell::new("Hello".to_owned());
219 cell.set("World".to_owned());
220 assert_eq!("World".to_owned(), cell.into_inner());
225 let cell = Cell::new(10);
226 assert_eq!(10, cell.replace(20));
227 assert_eq!(20, cell.get());
229 let cell = Cell::new("Hello".to_owned());
230 assert_eq!("Hello".to_owned(), cell.replace("World".to_owned()));
231 assert_eq!("World".to_owned(), cell.into_inner());
235 fn cell_into_inner() {
236 let cell = Cell::new(10);
237 assert_eq!(10, cell.into_inner());
239 let cell = Cell::new("Hello world".to_owned());
240 assert_eq!("Hello world".to_owned(), cell.into_inner());
244 fn refcell_default() {
245 let cell: RefCell<u64> = Default::default();
246 assert_eq!(0, *cell.borrow());
250 fn unsafe_cell_unsized() {
251 let cell: &UnsafeCell<[i32]> = &UnsafeCell::new([1, 2, 3]);
253 let val: &mut [i32] = unsafe { &mut *cell.get() };
257 let comp: &mut [i32] = &mut [4, 2, 5];
258 assert_eq!(unsafe { &mut *cell.get() }, comp);
262 fn refcell_unsized() {
263 let cell: &RefCell<[i32]> = &RefCell::new([1, 2, 3]);
265 let b = &mut *cell.borrow_mut();
269 let comp: &mut [i32] = &mut [4, 2, 5];
270 assert_eq!(&*cell.borrow(), comp);
274 fn refcell_ref_coercion() {
275 let cell: RefCell<[i32; 3]> = RefCell::new([1, 2, 3]);
277 let mut cellref: RefMut<[i32; 3]> = cell.borrow_mut();
279 let mut coerced: RefMut<[i32]> = cellref;
283 let comp: &mut [i32] = &mut [4, 2, 5];
284 let cellref: Ref<[i32; 3]> = cell.borrow();
285 assert_eq!(&*cellref, comp);
286 let coerced: Ref<[i32]> = cellref;
287 assert_eq!(&*coerced, comp);