It is entirely possible. What you’ll find is that your C++ code will become more and more like Rust in how it manages ownership of things. The better you get at this the fewer bugs your C++ code will have.

If you're using both languages regularly, yes. Personally I find that I can't retain things that I don't use, especially if it's a huge language that I've barely learned in the first place by practicing in my own time.

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