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by astrange
633 days ago
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Swift does have borrow checking: https://www.swift.org/blog/swift-5-exclusivity/ Basically the difference is that Swift's is more implicit, happens more at runtime, and it will make some programs work via copy-on-write that Rust would reject. So that's obviously more limiting. It's more flexible when you can allocate memory freely, but it doesn't work if you can't. |
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Bingo, that's the difference. That's why I said "compile-time memory safety". This is what Rust gives you for your trouble, zero (runtime) cost for memory safety.