c++ - Copy vector struct to file using ostream_iterator and copy -

i'm trying copy vector new text file after making necessary changes vector. can build project fine, giving me weird errors don't understand. possibly me this?

my struct

class accdetails { public:     string username;     string name;     string topicid;     string testid; }; 

the code giving me errors

vector<accdetails>accinfo; ofstream temp ("temp.txt"); ostream_iterator<accdetails>temp_itr(temp,"\n"); copy(accinfo.begin(),accinfo.end(),temp_itr);  

there's whole chunk of error lines, think should important 2 lines:

you'll need overload operator<< accdetails. ostream_iterator calls internaly.

something this:

std::ostream& operator<<(std::ostream& stream, const accdetails& obj) {        // insert objects fields in stream 1 one along     // description , formatting:      stream << "user name: " << obj.username << '\n'            << "real name: " << obj.name << '\n'            << obj.topicid << ' ' << obj.testid << '\n';      return stream; } 

the operator takes stream inserts first parameter , constant reference object streaming second 1 (this allows passing temporary accdetails, too). can say:

accdetails acc; std::cout << acc; 

if operator need access accdetail's private fields, need declare friend.

if you're new operator overloading, suggest read this thread.

hope helps.