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view src/triple_key_fn.sml @ 2246:4769b27aa436

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Merge.
author Ziv Scully <ziv@mit.edu>
date Sun, 02 Aug 2015 18:26:44 -0700
parents 88cc0f44c940
children
line wrap: on
line source
functor TripleKeyFn (structure I : ORD_KEY
                     structure J : ORD_KEY
                     structure K : ORD_KEY)
        : ORD_KEY where type ord_key = I.ord_key * J.ord_key * K.ord_key = struct

type ord_key = I.ord_key * J.ord_key * K.ord_key

fun compare ((i1, j1, k1), (i2, j2, k2)) =
    case I.compare (i1, i2) of
        EQUAL => (case J.compare (j1, j2) of
                      EQUAL => K.compare (k1, k2)
                    | ord => ord)
      | ord => ord

end