c++ - passing a stringstream to istream using operator >> -

i trying pass stringstream object(class) has overloaded extraction operator >> declared , defined. example, declaration overloaded extraction operator in object1 is

friend istream& operator >>(istream& in, object1& input); 

in object2, declaration same

friend istream& operator >>(istream& in, object2& input); 

during object1 extraction function, func. gets line, turns stringstream , tries use extraction(>>) operator of object2.

istream& operator >>(istream& in, object1& input){      object2 secondobj;      string data;      string token;      in>>data;      in.ignore();      token = gettoken(data, ' ', someint); //this designed take part of data      stringstream ss(token); // copied token ss      ss >> secondobj; // run problems. } 

i error no match operator >>. because need convert stringstream istream? if so, how that?

the minimal program this: in main.cpp:

#include "object1.h" #include "object2.h" #include "dataclass.h" using namespace std; int main(){     object1<dataclass> firstobj;     cin>>firstobj;     cout<<firstobj<<endl; } 

in object1.h:

#ifdef object1_h_ #define object1_h_ #include <iostream> #include <string> #include <cstddef> #include "object2.h" template<class t> class object1{ public:     //assume made big 3     template<class u>friend istream& operator >>(istream& in, object1<u>& input);     template<class u>friend ostream& operator <<(ostream& out, const object1<u>& output); private:     object2<t>* head; }; template<class t> istream& operator >>(istream& in, object1<t>& input){      object2 secondobj;      string data;      string token;      in>>data;      in.ignore();      token = gettoken(data, ' ', someint); //this designed take part of data      stringstream ss(token); // copied token ss      ss >> secondobj; // run problems. } template<class t> ostream& operator <<(ostream out, const object1<t>& output){      object2<t>* ptr;      while(getnextptr(ptr) != null){          cout<<ptr;          ptr = getnextptr(ptr); //assume have function in object2.h      } } 

the object2.h file looks similar object1.h except:

template<class t> class object2{ public: //similar istream , ostream funcions of object1 //a getnextptr function private:     t data;     object2<t>* next; }; template<class t> istream& operator >>(istream& in, object2<t>& input){       in>>data; //data private member variable in object2.                 //it of templated class type. } 

the following compiles fine:

#include <string> #include <sstream> #include <iostream>  using namespace std;  struct x{};  struct y{};  istream& operator>>(istream&, x&) {}  istream& operator>>(istream&, y&) {     stringstream ss("foo");      x x;     ss >> x; }  int main() {     y y;     cin >> y; } 

your problem must elsewhere

can post complete minimal self-contained program demonstrating problem? or declaration , definition of function istream& operator >>(istream& in, object2& input) ? declared ahead of object1 version in translation unit?