QT connect函数个数

QT的connect函数有多个重载，具体的个数取决于QT的版本和模块。一般来说，QT的connect函数至少有以下几个重载：

1. connect(const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type = Qt::AutoConnection)

2. connect(const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type = Qt::AutoConnection)

3. connect(const QObject *sender, const char *signal, const char *method, Qt::ConnectionType type = Qt::AutoConnection)

4. connect(const QObject *sender, const QMetaMethod &signal, const char *method, Qt::ConnectionType type = Qt::AutoConnection)

5. connect(const QObject *sender, const char *signal, Functor functor)

6. connect(const QObject *sender, const QMetaMethod &signal, Functor functor)

其中，前四个是最常用的重载形式，用于连接信号和槽函数或者普通函数。后两个重载形式则是用于连接信号和lambda表达式或者function对象。