将函数传递给要在其控制器中调用的指令的独立范围?

I'm trying to call a function passed from a controller's scope into a directive via the "&" operation from the directive's controller. That method, however, is claimed by Angular to be undefined. After reading my code over and over, scouring the internet, and then repeating that process, I've decided to turn to help here. I'm trying to call a function passed from a con