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view src/option_key_fn.sml @ 2243:da7d026d1a94

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Fix possible formula simplification bug with extra formula' type.
author Ziv Scully <ziv@mit.edu>
date Mon, 20 Jul 2015 19:49:13 -0700
parents 88cc0f44c940
children e4a7e3cd6f11
line wrap: on
line source
functor OptionKeyFn(K : ORD_KEY) : ORD_KEY = 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