如何在mongocxx find_one_and_update中设置文档中的值

#include <mongocxx/client.hpp>
#include <mongocxx/instance.hpp>
#include <mongocxx/options/find_one_and_update.hpp>

int main() {
    // 初始化mongocxx驱动
    mongocxx::instance instance{};

    // 创建mongocxx::client对象，连接到MongoDB数据库
    mongocxx::client client{mongocxx::uri{"mongodb://localhost:27017"}};

    // 获取指定的数据库和集合
    mongocxx::database db = client["mydb"];
    mongocxx::collection coll = db["mycollection"];

    // 创建查询条件和更新操作
    mongocxx::options::find_one_and_update options{};
    options.filter(document{} << "name" << "John" << finalize);
    options.update(document{} << "$set" << open_document << "age" << 30 << close_document << finalize);

    // 执行查询和更新操作
    bsoncxx::stdx::optional<bsoncxx::document::value> result = coll.find_one_and_update(options);

    // 处理查询结果
    if (result) {
        std::cout << bsoncxx::to_json(*result) << std::endl;
    } else {
        std::cout << "No matching document found." << std::endl;
    }

    return 0;
}