C++ 将QComboBox:：currentIndexChanged（int）连接到QSignalMapper:：map（）

我正试图找出如何在Qt5中实现这一点：

connect(qcombobox, SIGNAL(currentIndexChanged(int),
        qsignalmappe, SLOT(map()));

 connect(comboBox,static_cast<void (QComboBox::*)(int index)>(&QComboBox::currentIndexChanged),signalMapper,static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));

我试过这个：

connect(comboBox, static_cast<void(QComboBox::*)(int) (&QComboBox::currentIndexChanged),
        this->signalMapper, &QSignalMapper::map);

 connect(comboBox,static_cast<void (QComboBox::*)(int index)>(&QComboBox::currentIndexChanged),signalMapper,static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));

connect（组合框、静态信号映射器和QSignalMapper:：map）；

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但是编译器抱怨没有匹配的参数。我知道QSignalMapper:：map（）信号没有参数，但我不知道它如何使用旧语法

试试这个，它对我有用

 connect(comboBox,static_cast<void (QComboBox::*)(int index)>(&QComboBox::currentIndexChanged),signalMapper,static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));

connect（组合框、静态转换（&QComboBox:：currentIndexChanged）、信号映射器、静态转换（&QSignalMapper:：map））；