如何将ostream转换为字符串

#include <iostream>
#include <sstream>

int main() {
    std::ostringstream oss;  // 创建ostringstream对象

    int num = 123;
    std::string str = "Hello, world!";
    double dbl = 3.14;

    // 将内容写入ostringstream对象
    oss << "Number: " << num << ", String: " << str << ", Double: " << dbl;

    std::string result = oss.str();  // 获取ostringstream对象中的字符串
    std::cout << result << std::endl;  // 输出转换后的字符串

    return 0;
}