其中一个条件不符合就返回的一些好的写法

bool MsgJobs::Prepare() {
    int res = 1;
    if (jobs_flags & JOB_LEAVEMSG) {
        res &= m_leaveMsgAddThread.Prepare();
        res &= m_leaveMsgDelThread.Prepare();
        res &= m_leaveMsgGetThread.Prepare();
    }

    return !!res;
}