如何在C++中表示JSON文档的递归对象结构？

#include "rapidjson/document.h"
#include "rapidjson/writer.h"
#include "rapidjson/stringbuffer.h"

rapidjson::Document document;
document.SetObject();

rapidjson::Value object(rapidjson::kObjectType);
object.AddMember("key1", "value1", document.GetAllocator());
object.AddMember("key2", 123, document.GetAllocator());
document.AddMember("object", object, document.GetAllocator());

rapidjson::Value array(rapidjson::kArrayType);
array.PushBack("element1", document.GetAllocator());
array.PushBack(456, document.GetAllocator());
document.AddMember("array", array, document.GetAllocator());

rapidjson::StringBuffer buffer;
rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
document.Accept(writer);
std::string jsonStr = buffer.GetString();