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int show_task_progress(const Task& task) {	cout << "Task " << task.name << " now at " << task.progress << "%" << endl;}int main() {    ClientConnection client("localhost");    if (!client.authenticate("password")) {        cerr << "Authentication error\n";        return 1;    }    TaskList& tasks = client.get_all_tasks();	tasks.signal_progress().connect(sigc::ptr_fun(&show_progress));	tasks.set_update_interval(1);	client.start_loop();	return 0;}