error: no match for ‘operator<’ in ‘__x < __y’

[sneha09]

In code there are two map.One store pair<key,Values> and other store <Values,key> where Values is class with 5 variable with data type string,int,string,int,int.but during inserting in the second map i am getting error g++ error: no match for ‘operator<’ in ‘__x < __y’ when trying to insert in map.
(Note Keys and Values in first map changes to Values,Key in second map)

How to solve it.

     class Values
     {
     private:
        std::string C_addr;
        int C_port;
        std::string S_addr;
        int S_port;
        int C_ID;
 
     public:
        Values(std::string,int,std::string,int,int);
        void printValues();
     };
 
 
     Values :: Values(std::string Caddr,int Cport,std::string Saddr,int Sport,int Cid)
     {
        C_addr=Caddr;
        C_port=Cport;
        S_addr=Swaddr;
        S_port=Sport;
        C_ID=Cid;
     }
 
     void Values::printValues()
     {
        cout << C_addr<<":" <<C_port<<":" << S_addr <<":" <<S_port << ":"<<C_ID  <<endl;
     }
 
     map<int, Values> items;
     map<Values,int> itemscopy;
 
     Values connection (inet_ntoa(Caddr.sin_addr),ntohs(Caddr.sin_port),inet_ntoa(Saddr.sin_addr),ntohs(Saddr.sin_port),CID);
 
     for(unsigned int key=0;key<=30000;    )
     {
        map<int,Values>::const_iterator itemsIterator=items.find(key);
 
        if(itemsIterator==items.end())
        {
           items.insert(pair<int, Values> (key, connection));
           {
              map<Values,int>::const_iterator itemsIterator1;
              if(itemsIterator1==itemscopy.end())
                 itemscopy.insert(pair<Values,int> (connection, key));
           }
           break;
        }
        else
        {
           cout<<"already exist";
           key=key+1;
        }
     }

[Banfa]

It is doing that because the keys in a map are sorted using the < operator and your class Values has no implementation for this operation.

Add operator< to the class values.