如何使用字符串而不是文件提供Boost.PropertyTree？

#include <iostream>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>

int main()
{
    std::string jsonString = R"(
        {
            "name": "John",
            "age": 30,
            "city": "New York"
        }
    )";

    boost::property_tree::ptree pt;
    std::istringstream iss(jsonString);
    boost::property_tree::read_json(iss, pt);

    // 通过字符串提供Boost.PropertyTree
    std::string name = pt.get<std::string>("name");
    int age = pt.get<int>("age");
    std::string city = pt.get<std::string>("city");

    std::cout << "Name: " << name << std::endl;
    std::cout << "Age: " << age << std::endl;
    std::cout << "City: " << city << std::endl;

    return 0;
}