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[experiment] Make Cell<T>::update work for T: Default | Copy. #89357

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[experiment] Make Cell<T>::update work for T: Default | Copy. #89357

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3db5f34
Make `Cell<T>::update` work for `T: Default | Copy`.
m-ou-se Sep 29, 2021
a9c772a
Update test.
m-ou-se Sep 29, 2021
bb98c58
Fix typos in Cell::update docs.
m-ou-se Sep 29, 2021
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Update test.
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@m-ou-se
m-ou-se committed Sep 29, 2021
commit a9c772aaf0d32136d5c74e195b8af4f9ee9451f5
9 changes: 7 additions & 2 deletions library/core/tests/cell.rs
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Expand Up @@ -52,11 +52,16 @@ fn smoketest_cell() {
fn cell_update() {
let x = Cell::new(10);

assert_eq!(x.update(|x| x + 5), 15);
x.update(|x| x + 5);
assert_eq!(x.get(), 15);

assert_eq!(x.update(|x| x / 3), 5);
x.update(|x| x / 3);
assert_eq!(x.get(), 5);

let x = Cell::new("abc".to_string());

x.update(|x| x + "123");
assert_eq!(x.take(), "abc123");
}

#[test]
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