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: Hi there, : I defined an Activity class. This class has got an attribute : as CTime firstStartTime. : Now if I overload the << operator for the Activity class I got an : error . : If you have an idea why this happen please, replay. : the error is : : D:\MyProjects\ActiviProva\ActiviProva.cpp(48) : error C2679: binary '<<' : no operator defined which takes a right-hand operand of type 'class CTime' (or there is no acceptable conversion) : Error executing cl.exe. : ActiviProva.exe - 1 error(s), 0 warning(s) : here you are the code : : /*****************/ : #include "stdafx.h" : #include <iostream> : #include <functional> : #include <algorithm> : #include <utility> : #include <afx.h> : using namespace std; : typedef CTime TIME; : //typedef unsigned int TIME; : class Aactivity : { : : friend ostream& operator<< (ostream& os, const Aactivity& A ); : public: : Aactivity(){}; : virtual ~Aactivity(){}; : : void setFirstStartTime (TIME time) {firstStartTime=time;}; : void setLatestEndTime (TIME time) {latestEndTime=time;}; : TIME getFirstStartTime () const {return firstStartTime;}; : TIME getLatestEndTime ()const {return latestEndTime;}; : : protected: : TIME firstStartTime; : TIME latestEndTime; : private: : : }; : : ostream & : operator<< (ostream & ostr, const Aactivity & A) : { : : ostr << "A.firstStartTime =" << A.getFirstStartTime() << endl; : return ostr; : } : int main(int argc, char* argv[]) : { : Aactivity A; : : cout << A << endl; : return 0; : } : /*****************/ : thanks anyway, : Mauro : :