传递“矢量 <string> ”作为函数参数，但出现错误

Question

I've furthered in the realization of my save function and got the idea of passing my arguments as "vector" (because they are) instead of "string" which gives this:

void saveFunction(ofstream& save, vector<string> site, vector<string> url, vector<string> username, vector<string> password)
{
    save << site;
    save << url;
    save << username;
    save << password;

}

which gives this error:

error: no match for 'operator<<' (operand types are 'std::ofstream' {aka 'std::basic_ofstream<char>'} and 'std::vector<std::__cxx11::basic_string<char> >')

Answer 1

ofstream does not have an overloaded << operator for a std::vector , so you need to roll one yourself, for example

for (auto&& s : username){
    save << s;
}

although your reasons for using a std::vector might be questionable.