Mercurial > urweb
view src/option_key_fn.sml @ 2252:e843a04499d4
Revert to revision 2222.
author | Ziv Scully <ziv@mit.edu> |
---|---|
date | Mon, 21 Sep 2015 10:16:55 -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