Method pop

publication/code/chapter05/num2str_stk.rs:22–26

(&mut self)

    }

    fn pop(&mut self) -> Option<T> {
        if 0 == self.top { return None; }
        self.top -= 1;
        self.data.pop()
    }

    fn is_empty(&self) -> bool {
        0 == self.top