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view src/pair_key_fn.sml @ 2307:6ae9a2784a45

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author Adam Chlipala <adam@chlipala.net>
date Sun, 20 Dec 2015 14:39:50 -0500
parents 6bce459ca581
children
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functor PairKeyFn (structure I : ORD_KEY
                     structure J : ORD_KEY)
        : ORD_KEY where type ord_key = I.ord_key * J.ord_key = struct

type ord_key = I.ord_key * J.ord_key

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

end