为什么行不通

#if 0
35 typedef template<class T,class P>struct node{
36 T key;
37 P value;
38 }node;
39 template<class T,class P> class pair{
40 public:
41 pair(T t1,int i);
42 void insert(T val1,P val2);
43 int del(T val1,P val2);
44 private:
45 const int sum;
46 node<T,P> *value;
47 };
48 #endif