Method peek_mut

publication/code/chapter04/stack.rs:51–54

(&mut self)

    }

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

    // 以下是为栈实现的迭代功能
    // into_iter: 栈改变，成为迭代器