Compare content of std::stringstream

Question

I have two std::stringstream: ss1 and ss2, which are given as an argument to two different functions that fills them with data.

I want to sanity check that these functions writes the same content. How do I test for equality of two std::stringstream?

alg1.print(ss1);
alg2.print(ss2);

if(ss1 != ss2) {
   cout << "Content not identical!" << endl;
}

Does not work. Converting them both to str() works, however this seems ineffective. There must be a better way?

Answer 1

I think the only way to do so is to use the .str() method:

if (ss1.str() != ss2.str()) {
  cout << "Content not identical!" << endl;
}

I'm not sure if this is particulary fast but except if you are in an embedded context or you are checking millions of comparisons per second it should not matter.