Question

How can I define an output file stream within a class, so that I don’t have to keep passing it around to functions. Basically what I want to do is this:

class A {

private:
   ofstream otp ;

};

Then in my constructor, I simply have otp.open("myfile"); and in other functions I have otp.open("myfile", ios::app); , but it fails during compile time, saying:

../thermo.h(18): error: identifier "ofstream" is undefined
      ofstream otp ;

I have made sure to #include <fstream>

Thanks!

Answer 1

You’ll need to use the fully qualified name, std::ofstream.