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Rust's Cow (Copy-on-Write) is a smart pointer that enables lazy cloning. It's useful when data might be mutated or ownership might change, but you want to avoid unnecessary copies—ideal for read-heavy, write-rare scenarios. pub enum Cow<'a, B: ?Sized + 'a> where B: ToOwned, { /// Borrowed data. Borrowed(&'a B), /// Own ...

The Problem with Shallow Copying A simple smart pointer implementation that lacks reference counting can suffer from a critical flaw known as the double-free error. This occurs when a copy of the pointer is made, causing both the original and the copy to point to the same underlying resource. When either of these pointers goes out of scope, it ...