Circular C++ Header Includes

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Is this kind of cross-inclusions are prohibited?

Yes.

A work-around would be to say that the ifr member of mainw is a reference or a pointer, so that a forward-declaration will do instead of including the full declaration, like:

//#include "IFr.h" //not this
class IFr; //this instead
...
class mainw
{
public:
static IFr* ifr; //pointer; don't forget to initialize this in mainw.cpp!
static CSize=100;
...
}

Alternatively, define the CSize value in a separate header file (so that Ifr.h can include this other header file instead of including mainw.h).

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