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fooker • today at 6:47 AM • 1 reply • view on HN

You can just generate the 'vtable' as code :)

  switch (animal.type)
    case Cat: return cat_speak()
    case Dog: return dog_speak()
The generated code has the functions resolved in compile time, there's no function pointer lookup in a table happening. I don't know if this is how this project does it, but this is the commonly used technique when you want to do this.

Replies

jeswin • today at 7:05 AM

Hmm yeah good point. I didn't think of it. It might even be cheaper to do this when the list of possible types are closed and few.

I am still inclined to believe AI just made up the documentation though, because this has its own tradeoffs.

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