在C++中有Python fstring或字符串格式的等价物吗？

#include <iostream>
#include <string>

int main() {
    std::string str1 = "Hello";
    std::string str2 = " World";
    std::string result = str1 + str2;
    
    std::cout << result << std::endl;
    
    return 0;
}

#include <iostream>
#include <iomanip>

int main() {
    int num = 10;
    float pi = 3.14159;
    
    std::cout << "Number: " << std::setw(5) << num << std::endl;
    std::cout << "Pi: " << std::setprecision(3) << std::fixed << pi << std::endl;
    
    return 0;
}

Number:    10
Pi: 3.142