To clarify, I mean writing scripts that generate or modify classes for you instead of manually writing them every time, for example if you want to replace reflection with a ton of verbose repetitive code for performance reasons I guess?
My only experience with this is just plain old manual txt generation with something like python, and maintaining legacy t4/tt VS files but those are kind of a nightmare.
What’s a good modern way of accomplishing this, have there been any improvements in this area?
Both languages you mentioned i highly recommend.
Lisp macros are another level, because they are part of the language - you can use all language primitives to transform forms however you like.
Haskell will give you a different view of programming. It’s beautiful and concise, and implements all sorts of academic research in languages. Ocaml is similar in many respects.