> Now comes the funny part.  Actually, right now I'm not sure how to
> represent the buffer variable internally.  As you can see, in the first
> part I chose string, because of the .[] operator.  However, I cannot use
> string, because this data type doesn't have any fold function.  Right
> now I do not want to make a decision about the data type used, except
> that I know that it must be a sequence of characters.
>
> Though I am a strong believer in static typing, above versions
> disappoint me heavily because of type restrictions.  Is there any way to
> write above version on arbitrary sequences like Arrays, Lists, Strings?
>
> Actually, I would have preferred the buffer data type because I can use
> that one for fast reading of a file.  However, I cannot fold over a
> buffer :(
>
> Any enlightening hints?

You should have a look at ExtLib Enum module that enable you to apply fold's
and others functionals operations on any underlying data structure (string,
array, list, .... ).

http://ocaml-lib.sf.net

Regards,
Nicolas Cannasse

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