Implement cell::clone_ref #14189
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Implement cell::clone_ref #14189
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| @@ -186,6 +186,24 @@ impl<'b, T> Deref<T> for Ref<'b, T> { | |||
| } | |||
| } | |||
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| /// Copy a `Ref`. The `RefCell` is already immutably borrowed, | |||
| /// so this cannot fail. | |||
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Prevailing convention is one space after the period.
Also, did you intend for the second sentence to be part of the method summary? I would expect that to be in the description.
Per discussion with @alexcrichton, this is a free function.
| /// A `Clone` implementation would interfere with the widespread | ||
| /// use of `r.borrow().clone()` to clone the contents of a `RefCell`. | ||
| #[experimental] | ||
| pub fn clone_ref<'b, T>(orig: &Ref<'b, T>) -> Ref<'b, T> { |
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I assume this doesn't just call orig.parent.borrow() to avoid code bloat from fail!?
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And to avoid checking if the borrow flag is set to WRITING. LLVM can optimize
let y = x.get();
x.set(y + 1);
into a single inc instruction.
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Yay for free functions! |
flip1995
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Feb 27, 2025
…4191) ```rust let mut tmp = vec![1, 2, 3]; for b in &mut tmp { *b = !*b; } ``` must not suggest the invalid `tmp.fill(!*b)`. In addition, there is another commit which cleans up two function calls with no effect. Fix rust-lang#14189 changelog: [`manual_slice_fill`]: ensure that the initialization expression doesn't reference the iterator
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Per discussion with @alexcrichton, this is a free function.