See: <a href="/doc/reference/classes/ucalc.callback/-constructor/">(Constructor)</a>, <a href="/doc/reference/classes/ucalc.callback/arg/">Arg</a>, <a href="/doc/reference/classes/ucalc.callback/argexpr/">ArgExpr</a>, <a href="/doc/reference/classes/ucalc.callback/argitem/">ArgItem</a>, <a href="/doc/reference/classes/ucalc/definefunction/">DefineFunction</a>, <a href="/doc/reference/classes/ucalc.expression/evaluate/">Evaluate</a>, <a href="/doc/reference/classes/ucalc/introduction/">Introduction</a>, <a href="/doc/reference/classes/ucalc.item/value/value-double/">Value(double)</a>