当connect想要连接一个重载函数时，因为名字是一样的，但是参数不同。用qt5的connect写法，编写时提示错误。
解决的办法是使用qOverload()或者把函数指针强制转换成对应的函数指针，需要Qt 5.7版本以上。

使用示例：

struct Foo {
    void overloadedFunction();
    void overloadedFunction(int, QString);
};

// requires C++14
qOverload<>(&Foo:overloadedFunction)
qOverload<int, QString>(&Foo:overloadedFunction)

// same, with C++11
QOverload<>::of(&Foo:overloadedFunction)
QOverload<int, QString>::of(&Foo:overloadedFunction)

*错误链接

I’m having trouble getting to grips with the new signal/slot syntax (using pointer to member function) in Qt 5,
as described in New Signal Slot Syntax. I tried changing this:


QObject::connect(spinBox, SIGNAL(valueChanged(int)), slider, SLOT(setValue(int));


to this:


QObject::connect(spinBox, &QSpinBox::valueChanged, slider, &QSlider::setValue);

but I get an error when I try to compile it:


error: no matching function for call to QObject::connect(QSpinBox*&,, QSlider*&, void(QAbstractSlider: