If child is at the toplevel, and doesn’t have a parent, then
iter is set to an invalid iterator and FALSE is returned.
child will remain a valid node after this function has been
called.
iter will be initialized before the lookup is performed, so child
and iter cannot point to the same memory location.
Sets iter to be the parent of child.
If child is at the toplevel, and doesn’t have a parent, then iter is set to an invalid iterator and FALSE is returned. child will remain a valid node after this function has been called.
iter will be initialized before the lookup is performed, so child and iter cannot point to the same memory location.