要从类外部访问myQueue::Node，您需要稍微重写一下getter函数:

To acess myQueue::Node from outside the class you need to rewrite your getter function a bit:

template<class T>
myQueue<T>::Node* myQueue<T>::getHead()
{
    return head;
}

然后您可以像这样在main()中使用它

Then you can use it in main() like this

auto head = queue.getHead();

请注意，在这种情况下，auto的用法很重要.您仍然不能在myQueue<T>之外声明任何myQueue<T>::Node或myQueue<T>::Node**类型的变量，但是可以使用auto变量来保存这些类型.

Note that the usage of auto is important in this case. You still cannot declare any variable of type myQueue<T>::Node or myQueue<T>::Node** outside of myQueue<T>, but you can use auto variables to hold these types.