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view src/option_key_fn.sml @ 2251:25874084bf1f

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Make Mono.file a record for readability upon extension.
author Ziv Scully <ziv@mit.edu>
date Sun, 13 Sep 2015 17:02:17 -0400
parents e4a7e3cd6f11
children
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line source
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