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view src/option_key_fn.sml @ 2283:4afaab523213

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Initialize invalidation to NULL!
author Ziv Scully <ziv@mit.edu>
date Thu, 12 Nov 2015 10:06:07 -0500
parents e4a7e3cd6f11
children
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functor OptionKeyFn(K : ORD_KEY)
        : ORD_KEY where type ord_key = K.ord_key option = struct

type ord_key = K.ord_key option

val compare =
 fn (NONE, NONE) => EQUAL
  | (NONE, _) => LESS
  | (_, NONE) => GREATER
  | (SOME x, SOME y) => K.compare (x, y)

end