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Asked: 2026-05-30T13:57:55+00:00

I am working on someone else code at work (Qt Desktop application) and found

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I am working on someone else code at work (Qt Desktop application) and found this:

connect( &*mpMainWin, SIGNAL(whatever()), this, SLOT(whatever()) ));

I have some difficulties to understand the part &*mpMainWin. As far as I know about pointers, it returns the address of the de-referenced pointer mpMainWin.

But mpMainWin already hold that address, so giving it directly as a parameter should have the same result.

So if I’m not missing anything and my logic is right, what is the reason of doing such a thing? and if there is one when should we use that kind of syntax?

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1 Answer

  1. Editorial Team

    This can be used as a trick to convert a smart pointer (i.e. not really a pointer, a class implementing operator*()) into a plain pointer. Without seeing how mpMainWin is declared it is impossible to say if that’s the case here. If mpMainWin is a plain pointer to begin with then yes, &*mpMainWin is the same as just mpMainWin.

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