如何在C++中将int附加到字符串中？

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

int main() {
    int num = 42;
    std::string str = "The answer is ";
    std::ostringstream oss;
    oss<< str<< num;
    std::string result = oss.str();

    std::cout<< result<< std::endl;
    return 0;
}