> Yes, I had failed to see the proper solution: a class generator — so that I didn't have to manually copy code again
No, please don't. This is jumping from the frying pan into the fire. If you think abstract base classes can be clever and hard to understand, code generators can be even more so. In addition, because code generators are a one way conversion, and the generated code evolves independently and the code generator itself is evolving independently, you end up with a bunch of things that are subtly different yet somewhat related in a way that you will need an advanced degree in evolutionary biology to understand.
No, please don't. This is jumping from the frying pan into the fire. If you think abstract base classes can be clever and hard to understand, code generators can be even more so. In addition, because code generators are a one way conversion, and the generated code evolves independently and the code generator itself is evolving independently, you end up with a bunch of things that are subtly different yet somewhat related in a way that you will need an advanced degree in evolutionary biology to understand.