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From: lutz@iks-jena.de (Lutz Donnerhacke)
Newsgroups: comp.lang.ada
Subject: Re: Ada The Best Language?
Date: Fri, 20 Jul 2001 15:47:23 +0000 (UTC)
Organization: IKS GmbH Jena
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* Bertrand Augereau wrote:
>> >struct Head
>> >{
>> >    ...
>> >    unsigned int offset1:5;
>> >    unsigned int more_fragments :1;
>> >    unsigned int dont_fragment : 1;
>> >    unsigned int pad:1;
>> >    ..
>> >}
>>
>> What does "Head.more_fragments = (total - send)/packet_size;" mean?
>
>It is an unsigned int affectation which is undefined if ((total -
>send)/packet_size) is bigger than 1 bit, no?

What do you expect by reading the source code line? What does really happen?
Why can this remain in production software for years?

>> >But you have to ensure the previous elements of the structure make the
>> >padding right.
>>
>> No problem. I can live with that (unfortunely, I can't remember the C++
>> language definition specifying that all components must be not aligned but
>> packed.)
>
>I guess bitfields force packing, but I'm not sure. And my Stroustrup's not
>there. Else you got me and we have to rely on copmpiler specific stuff.
>I'll check.

'guess'. No more questions.