How to define class RTTI info macro?

[lni]

There will be costly to inherit from QObject as there are thousand of QGraphicsItem.

I just need a macro so I can get class info, such as

class MyGraphicsItem : public QGraphicsItem
{
  TYPE_INFO( MyGraphicsItem )
...
}

class MyGraphicsItem : public QGraphicsItem
{
  TYPE_INFO( MyGraphicsItem )
...
}

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But I don't know how to write such macro...