structure Util :> UTIL =
struct

fun printInt n =
    Web.print (if n < 0 then
		   "-" ^ Int.toString (~n)
	       else
		   Int.toString n)

fun printReal n =
    Web.print (if n < 0.0 then
		   "-" ^ Real.fmt (StringCvt.FIX (SOME 2)) (~n)
	       else
		   Real.fmt (StringCvt.FIX (SOME 2)) n)

fun id x = x

fun makeSet f items =
    case items of
	[] => "()"
      | [usr] => "(" ^ f usr ^ ")"
      | usr::rest => foldl (fn (usr, s) => s ^ ", " ^ f usr) ("(" ^ f usr) rest ^ ")"

fun neg (r : real) = ~r

end