You're replying to a comment by Will.

August 06, 2011, 23:10

So what you did was show the idioms for implementing functors in three languages, and how c++'s mutability makes it possible to break the mathematical contract and still do useful things.

I don't think you're correct when you say "functors" aren't equivalent in all three languages.

For Prolog though, you really need to think in a different vocabulary. You show the functor predicate unifying F and A with a term. I'm sure there's an idiom for functor usage on par with ML, but I'm not enough of a Prolog wizard to know what it is:)

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