foreach (QString str, list) { qDebug() << str; const QString studentID = str; for(auto& studentID : students){ auto studentIt = m_students.find(studentID); if(studentIt == m_students.end()){ qDebug() << "student is not exist"; return; } auto it = studentIt.value()->m_workMap.find(actName); if(it != studentIt.value()->m_workMap.end()){ qDebug() << "activity repeat"; return; } activity* act = new activity; act->m_name = actName; act->m_startTime = time; act->m_endTime = -1; act->m_type = type; act->m_data.push_back(data); act->m_week.push_back(week); studentIt.value()->m_workMap.insert(act->m_name, act); log(m_currentPeople, "发布了活动[" + actName + "]给[" + studentIt.value()->m_name + "]"); } }

这段代码中使用了两个名为`studentID`的变量，一个是foreach语句中的迭代变量，另一个是for循环中的auto& studentID。这会导致编译错误，因为在同一作用域中不能有同名变量。如果你想在for循环中使用迭代变量，可以将其更改为不同的名称，例如：

foreach (QString str, list) {                 
    qDebug() << str;                 
    const QString studentID = str;                 
    for(auto& id : students){                     
        auto studentIt = m_students.find(id);                     
        if(studentIt == m_students.end()){                         
            qDebug() << "student is not exist";                         
            return;                     
        }                      
        auto it = studentIt.value()->m_workMap.find(actName);                     
        if(it != studentIt.value()->m_workMap.end()){                         
            qDebug() << "activity repeat";                         
            return;                     
        }                      
        activity* act = new activity;                     
        act->m_name = actName;                     
        act->m_startTime = time;                     
        act->m_endTime = -1;                     
        act->m_type = type;                     
        act->m_data.push_back(data);                     
        act->m_week.push_back(week);                      
        
        studentIt.value()->m_workMap.insert(act->m_name, act);                     
        log(m_currentPeople, "发布了活动[" + actName + "]给[" + studentIt.value()->m_name + "]");             
    }          
}

这样就能避免同名变量的问题了。