Mercurial > urweb
view src/option_key_fn.sml @ 2269:f7bc7c11a656
Make SQL caches use more of the pure caching machinery, but it's brittle.
author | Ziv Scully <ziv@mit.edu> |
---|---|
date | Thu, 15 Oct 2015 00:52:04 -0400 |
parents | e4a7e3cd6f11 |
children |
line wrap: on
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