Chris Rathman writes:
> In translating some more stuff into Oz, I have an accumlator that takes
> a function as a parameter. The following works well enough:
>
> fun {Accumulate Initial Sequence Oper}
> case Sequence
> of nil then Initial
> [] H|T then {Oper H {Accumulate Initial T Oper}}
> end
> end
>
> {Browse {Accumulate 0 [1 2 3 4 5] (fun {$ A B} A + B end)}}
>
> What I was wondering is how to specify the built-in operators as a
> function parameter, short of wrapping it into a lambda function like
> above? Something like:
>
> {Browse {Accumulate 0 [1 2 3 4 5] op+}}
>
> Where op+ is just supposed to be the binary plus operator as a function
> that takes two parameters.
>
> Thanks,
> Chris Rathman
>
Most (all?) operators have a procedural equivalent. You can find them
in chapter 11 of the Base Environment documentation:
http://www.mozart-oz.org/documentation/base/node14.html#chapter.infix
btw, your Accumulate is List.foldR with the paremeters re-ordered:
fun {Accumulate Z L F}
{List.foldR L F Z}
end
cheers
k
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