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I have the following code. Why its undefined to derefrence union pointers in the following way ?
extern union MyUn *P1;
extern union MyUn *P2;
extern void myfunc(void)
{
*P1 = *P2;
}
That has nothing to do with unions in particular, and it’s not “undefined”, either: It’s simply a compiler error if you try to dereference a pointer to an incomplete type (for obvious reasons).