How do you catch the output of a void function that takes ostream as a parameter into a stringstream?

Question

Let's say we have:

void print(std::ostream &o) {
    o << "Hello World!";
}

and:

int main() {
    std::stringstream ss;
    ss << print(std::cout); // does not work
    std::string outputString = ss.str();
    std::cout << outputString << endl;
}

I understand this will not working because print() has type void. How would I change my code for this to work?

Solution:

int main() {
    std::stringstream ss;
    print(ss);
    std::string outputString = ss.str();
    std::cout << outputString << endl;
}