Google style guide is good tbh.
You should use the right tool for the job.
std::unique_ptr is just a move-only ergonomics type over a bare pointer, it doesn't have extra state. std::shared_ptr is basically no different than Rust's Arc.
Closures specify capture semantics explicitly, so you will always know, and default to copy.
And yes, you can capture local references and leave. Don't do that, or return references to local variables, or lots of other fun stuff.
