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/argcount/">ArgCount</a>, <a href="/doc/reference/classes/ucalc/definefunction/">DefineFunction</a>, <a href="/doc/reference/classes/ucalc.callback/introduction/">Introduction</a>, <a href="/doc/reference/classes/ucalc.callback/return/">Return</a>