Converting strstream to sstream conflict about c_str()

Question

I have this code block as written with strstream. And I converted it to sstream as below. I\'m not sure, but I think printStream->str()

Answer 1

I think a function called to_string really, really, really should return a std::string.

And then all this junk can be replaced by

std::string FieldData::to_string() const
{ return "Invalid Field Type"; }