Warp wrote:
> Invisible <voi### [at] devnull> wrote:
>> Now what happens if you want to only process elements having some
>> arbitrary property? (E.g., only the odd numbers.)
> 
> I make the function take a functor which tells which elements to
> process.
> This is a standard technique in C++.

You can even write a custom iterator that, when incremented, skips even
numbers. Then you can use it with the existing fold function.

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