Mercurial > urweb

view src/option_key_fn.sml @ 2288:98f96a976ede

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Finish locking, but it's not yet tested rigorously.
author Ziv Scully <ziv@mit.edu>
date Fri, 13 Nov 2015 11:03:09 -0500
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