C++:如何将fprintf结果作为std :: string w/o sprintf

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

int main() {
    int a = 10;
    double b = 3.14;

    std::ostringstream oss;
    oss << "The value of a is: " << a << ", and the value of b is: " << b;

    std::string result = oss.str();
    std::cout<< result<< std::endl;

    return 0;
}