On Mon, 11 Nov 2002, David Malone wrote: DM>On Mon, Nov 11, 2002 at 04:52:22PM +0100, Harti Brandt wrote: DM>AG>But does using a union make it safe? DM> DM>> Well, I just had a long discussion with a collegue about the topic. The DM>> main problem is in the ISO-C standard, section 6.7 point 4 which states: DM>> DM>> All declarations in the same scope that refer to the same object or DM>> function shall specify compatible types. DM> DM>I think Section 6.5 paragraph 7 allows access through unions. There DM>is a footnote saying that the list given (which includes access DM>through the same type, qualified versions of the same type, aggregates DM>and unions containign that type and character types) is intended DM>for determining aliasing rules.
That just allows you to do int foo union bar { int foofoo; } *ptr = (union bar)&foo; I think. You end up with the same situation - you can refer the integer object foo only through an integer pointer. harti -- harti brandt, http://www.fokus.gmd.de/research/cc/cats/employees/hartmut.brandt/private [EMAIL PROTECTED], [EMAIL PROTECTED] To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message