如何在C++中从stringstream转换为字符串？

#include<iostream>
#include <sstream>
#include<string>

int main() {
    std::stringstream ss;
    ss << "Hello, World!";

    std::string str;
    ss >> str;

    std::cout << "Converted string: "<< str<< std::endl;

    return 0;
}