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Not sure why that seems like a challenge, but it's trivial since 2001. Use a codeblock.

++ triggers AI autocomplete; a whole wall of text of autocomplete.

So the question was likely: how to write the word "C++" in your prose (as opposed to writing some C++ code)

Great question – all you need to do is hit CMD+Z or Esc when the generation starts and it automatically aborts it and gives you your "++" back!

I've debated between "++" vs "+++", but settled for ++ since it's lesser keystrokes (at the risk of conflicting with more common words/phrases) haha