[Qt-interest] check if QPaintDevice is QPrinter

[Dmitry Teslenko]

Hello!
I want to check if QPaintDevice is QPrinter. In Qt3 there was
bool QPaintDevice::isExtDev () const  for that.

In Qt4 there is int QPaintDevice::devType() instead which is undocumented
and returns member of QInternal enum.

Is dynamic_cast my only option?

Thanks.
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