Qt信号重载指定调用方式

来自Qt文档  void QComboBox::currentIndexChanged(int/const QString)

connect(comboBox, QOverload<int>::of(&QComboBox::currentIndexChanged),
     [=](int index){ /* ... */ });
     
 connect(comboBox, QOverload<const QString &>::of(&QComboBox::currentIndexChanged),
     [=](const QString &text){ /* ... */ });