/home/wss/linux/Qt_Project/03exprPro/exprPro/model.h:6: error: changes meaning of ‘model’ from ‘class model’ [-fpermissive] class model ^~~~~
原因是在另一个类里，定义了一个这个类的指针。
至于为什么定义了这个就报错呢。暂时没搞明白，我是跟着教程做的，人家没事，我这报错！！！
error: changes meaning of ‘xxx’ from ‘class xxx’ [-fpermissive] class model
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