boost::ptree；boost::json_parser

{
    "Version": 1,
    "Metrics": [{
        "wingarea": 1341.01,
        "unit": "FT2"
    }, {
        "wingspan": 1350.81,
        "unit": "Inch"
    }],
    "Propulsion": {
        "Location": {
            "XEDIC": 22.618,
            "unit": "FT"
        }
    }
}

#include <cstdio>
#include <iostream>
#include <sstream>
#include <vector>
#include <string>
#include <set>
#include <exception>
#include <iostream>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/xml_parser.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/foreach.hpp>
#include <boost/typeof/typeof.hpp>
using namespace std;
using namespace boost;
namespace pt = boost::property_tree;

int main()
{
    pt::ptree tree;

    string m_file = "./ss.json";

    try
    {
        // 创建ptree对象
        boost::property_tree::ptree json_root;
        // 读取file文件，并将根节点存储赋值给json_root
        boost::property_tree::read_json<boost::property_tree::ptree>(m_file, json_root);

        //1解析键值对
        cout << json_root.get<int>("Version") <<endl;

        //2获取子节点的方法
        boost::property_tree::ptree Metrics = json_root.get_child("Metrics");
        boost::property_tree::ptree::iterator json_iterator = Metrics.begin();
        cout << json_iterator->second.get<double>("wingarea") << endl;
        cout << json_iterator->second.get<string>("unit") << endl;
        json_iterator++;
        cout << json_iterator->second.get<double>("wingspan") << endl;
        cout << json_iterator->second.get<string>("unit") << endl;

        //3逐级解析
        boost::property_tree::ptree Propulsion = json_root.get_child("Propulsion");
        boost::property_tree::ptree Location = Propulsion.get_child("Location");
        cout << Location.get<double>("XEDIC") << endl;
        cout << Location.get<string>("unit") << endl;
    }
    catch (std::exception &e)  
    {
        cout << "Error: " << e.what() << endl;
    }
}