Synthatic sugar for ()=>T

Dear all,Is there any way to express in a simple way a function ()=>T ?
I end up often writing
resultOrErrorMessage(()=>doAction(key)(_.summary))(None);
but I would like to write
resultOrErrorMessage(doAction(key)(_.summary))(None);
where
private def doAction(key: CurveKey)(f: CurveMonitor => String): String = {    monitor(key) match {      case Some(associatedMonitor) => f(associatedMonitor)       case None => "The required curve is not in the current partition, or the currency is not started"    }  }

Thank you for your help
Best Regards