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view src/list_key_fn.sml @ 2294:f8903af753ff

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Support nested queries but disable UrFlow for now.
author Ziv Scully <ziv@mit.edu>
date Thu, 19 Nov 2015 01:59:00 -0500
parents 6bce459ca581
children
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functor ListKeyFn(K : ORD_KEY)
        : ORD_KEY where type ord_key = K.ord_key list = struct

type ord_key = K.ord_key list

val rec compare =
 fn ([], []) => EQUAL
  | ([], _) => LESS
  | (_, []) => GREATER
  | (x::xs, y::ys) => case K.compare (x, y) of
                              EQUAL => compare (xs, ys)
                            | ord => ord

end