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I think the main point here is that while this style might make sense for a GUI framework it's not so great for a numerical library like this.

For example: my library is really slow.

And instead of blaming OOP, have you actually used a profiler?

Are you suggesting that many individual allocations and virtual dispatch are not impactful, or just advocating use of a profiler?

Once again, the context of this thread is someone taking an interest in C++ to write fast autodiff code.