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这两个类哪个排在前面都会报另一个is not a template，怎么解决

template<class T>
class Circular {
   public:
       Circular() {last = 0;}
       ~Circular();
       bool IsEmpty() const {return last = = 0;}
       int Length() const;
       bool Find(int k, T& x) const;
       int Search(const T& x) const;
       Circular<T>& Delete(int k, T& x);
       Circular<T>& Insert(int k, const T& x);
       //void Output(ostream& out) const;
   private:
       ChainNode<T> *last; // pointer to last node
   };
template<class T>
class ChainNode{
   friend Circular<T>;
   private:
   T data;//编号   密码通过数组存储
   ChainNode<T> *link;
   };

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SoftwareTeacher 2021-01-23 04:17
你要在引用之前, 先预定义一下, 在最前面加上:

template<class T>
class ChainNode;

参看: Compiler Error C2079 | Microsoft Docs

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