I don't write much C or C++, but I like writing transpilers and got pretty far with an F# to C backend a while ago, and it was pretty difficult for me (granted it was my first codegen project)

I tried it again with C++ out of curiosity and C++ is ridiculously featured for making it into your own and little domain languages or something that feels like a new feature. Genuinely kind of awesome for transpilers and it definitely gave some insight to the "C++ is awesome, but you have to pick the 20% of features you like" wisdom I've heard

LLMs were fun for exploring C++ patterns as well. I could ask it techniques for approximating some construct in another language and get a full page of toys to try out. It definitely made me want to explore templates in my own language in addition to runtime generics