Q_DECL_OVERRIDE

 

Q_DECL_OVERRIDE也就是c++的override

# define Q_DECL_OVERRIDE override

在重写虚函数时会用到，

作用是防止写错虚函数：

// generate error if this doesn't actually override anything:
virtual void MyWidget::paintEvent(QPaintEvent*) Q_DECL_OVERRIDE;