Get all topics in c++

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I got this one

bool getRosTopics(ros::master::V_TopicInfo& topics){
    XmlRpc::XmlRpcValue args, result, payload;
    args[0] = ros::this_node::getName();

    if (!ros::master::execute("getTopicTypes", args, result, payload, true)){
        std::cout << "Failed!" << std::endl;
        return false;
    }

    topics.clear();
    for (int i = 0; i < payload.size(); ++i)
        topics.push_back(ros::master::TopicInfo(std::string(payload[i][0]), std::string(payload[i][1])));
    return true;
}