> Hi! > > Use void*: > > MyType1* var1; > void* ptr; > > ptr = var1; > > // C-Style cast > var1 = (MyType1*)ptr; > > // Dynamic cast, checks types at runtime > var1 = dynamic_cast<MyType1*>(ptr); > > // Reinterpret cast does the same as C-Style cast (at least i think so) > var1 = reinterpret_cast<MyType1*>(ptr); > .... > > Also you may want to look at the other *_cast operators (static_cast, > etc)... > > Sorry, i don't want to insult you, but this made me laugh ;o) > > Cheers, Markus > Maybe that work for you but I get this error: "simulationview.cpp:26: Fehler: Ungültige Umformung von »void*« in »QWidget*«" OR simulationview.cpp:26: Fehler: dynamic_cast »SimulationView::ptr« (des Typs »void*«) in Typ »class QWidget« (target is not pointer or reference) kann nicht vorgenommen werden So *ptr isn't typeless or on the other hand, gcc does type checking for void *ptr. So until gcc does not check the type behind a pointer in a special case I can't belief that that will work. And I want that result in not more than 2 lines of code like in any other programming language. If that would work, classes and c++ would be sensless. The only way I see is to do it extern over the linker, because ld doesn't care about types. A other possibility I see is to use DCOP of KDE or linux system mechanism (threading) or better write and read from terminal or file. I guess that are going to be two days and 200 pages to read until I can solve this problem.