How to correctly overload the << operator with seperate bodies for fstream and ostream ?

Question

I am trying to overload the << operator for files and cout in a Complex Number Class...

friend ostream& operator<<(ostream& os, const Complex& c)
{
std::ofstream* p_ofs = dynamic_cast<std::ofstream*>(&os);
if( p_ofs == NULL )
{
os.precision(6);
os.setf(ios::fixed);
os<<"("<<c.real<<","<<c.imag<<")";
}
else
{
p_ofs->setf(ios::fixed);
(*p_ofs)<<c.real<<" "<<c.imag;
}
return os;
}

Now, on calling cout<<Complex(2,2)<<endl; , I get (2,2) just as I wanted...
But, on calling file<<Complex(2,2)<<endl; , I get (2,2) in the file, in which I wanted 2 2 ...

Why is there a similarity of outputs?
//I tried overloading this function for fstream, but that failed. So, I tried dynamic cast...

Answer 1

Try.

#include <typeinfo>

if(typeid(&os) == typeid(std::ostream*))...
else if(typeid(&os) == typeid(std::ofstream*))...