信号指向结构中的插槽

我想要一个信号连接到结构内部的插槽。我的结构看起来像:

//Header file

struct someStruct {
    public:
        int index;

    public slots:
        void someSlot();
};

QList<someStruct*> mListOfStructs;

clicked() 发送信号至 someSlot 功能。

//Source file

QPushButton *cmd = new QPushButton();
grd->addWidget(cmd, 3, 2, Qt::AlignCenter);
//grd is a QGridLayout somewhere inside the gui. I can see it and also the button.

现在连接 插槽位于特定结构中的事件不起作用。

connect(cmd, SIGNAL(clicked()), mListOfStructs[3], SLOT(someSlot()));

我可以用 How to connect in Qt signal and slot in dynamically added buttons to get in slot index of added button? 作为解决办法。