按钮下加“取地址符号”有什么用

按钮上加“取地址符号”有什么用

C/C++ code

    //按钮们    addButton = new QPushButton(tr("&Add"));    addButton->show();    submitButton = new QPushButton(tr("&Submit"));    submitButton->hide();    cancelButton = new QPushButton(tr("&Cancel"));    cancelButton->hide();