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millstone
on Feb 6, 2019
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Swift 5 Exclusivity Enforcement
Are you sure that code expresses the same pattern? It looks like Rust's COW can only transition from Borrowed to Owned by making a copy. Swift's COW works by dynamically inspecting the reference count.
giornogiovanna
on Feb 6, 2019
[–]
Right, unless I'm mistaken, what you want is `Rc` with `Rc::make_mut`[0], not `Cow`.
[0]:
https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#metho...
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