Question

I have a C++ class in which I have a constructer that takes char*,char*, ostream. I want to provide a default value for the ostream (cerr). Is this done in the header or the .cpp file?

Answer 1

You’ll need to make the parameter into a reference parameter, you shouldn’t try to copy std::cerr. You probably need to specify the default parameter in the header file so that it’s visible to all clients of the class.

e.g.

class MyClass {
public:
    MyClass(char*, char*, std::ostream& = std::cerr);
    // ...
};