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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 14:19:02 +0000 (UTC)
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* Bertrand Augereau wrote:
>> Please specify the C++ Code for offset 6.
>>       [...]
>>       dont_fragment    at  6 range 6 .. 6;
>>       more_fragments   at  6 range 5 .. 5;
>>       offset1          at  6 range 0 .. 4;
>>       [...]
>
>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?

>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.)

>> https://www.iks-jena.de/mitarb/lutz/ada/net/net-portability__adb.htm
>>
>> It's horrible ugly, but compile time evaluable and the generated code
>> is incredibly fine. Ever seen a Compiler generating an endian prefix on
>> alpha?
>
>Sometimes you have to live with ugliness...

No. I'm designing a language to specify such format.