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Message: [QUOTE="Kai-Uwe Bux, post: 1495733"] Sounds like you want to hack a setWidget() method from the outside. One idea would be to do something like void setWidget( B& b, A* a ) { char * b_data = (char*) &b; // and now do some manipulations to b_data[...] to // set the field b.m_a } For instance, on my machine the following program #include <iostream> class B{ private: unsigned int l; public: unsigned int get( void ) { return( l ); } }; // B void set ( B& b, unsigned int k ) { char* b_data = (char*) &b; char* k_data = (char*) &k; for ( int i = 0; i < 4; ++i ) { b_data[i] = k_data[i]; } } int main ( void ) { B b; std::cout << b.get() << std::endl; set( b, 6 ); std::cout << b.get() << std::endl; } prints 3221224484 6 I would think, however, that the setWidget() method was left out for a reason and that you are very likely to break all sorts of stuff inside the object b. Hope this helps Kai-Uwe Bux[/i][/i] [/QUOTE]