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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: AI12-0218: What is the portable representation clause for
 processing IETF packets on little-endian machines?
Date: Fri, 11 May 2018 14:46:59 +0100
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Date: 2018-05-11T14:46:59+01:00
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Simon Wright <simon@pushface.org> writes:

>    type Leap_Indicator is (No_Warning,
>                            Last_Minute_Has_61_Seconds,
>                            Last_Minute_Has_59_Seconds,
>                            Alarm_Condition);
>
>    type Version is range 3 .. 4;
>
>    type Mode is (Reserved,
>                  Symmetric_Active,
>                  Symmetric_Passive,
>                  Client,
>                  Server,
>                  Broadcast,
>                  Reserved_For_NTP_Control_Message,
>                  Reserved_For_Private_Use);
>
>    type Status is record
>       LI : Leap_Indicator;
>       VN : Version;
>       M : Mode;
>    end record;
>
> in native layout (nowadays I'd be a lot more specific about
> sizes).

Actually, I don't think I would: I realise that in that code I was
leaving it up to the compiler to work out the best representation for
use in the vast majority of the program. Just specify enumerations,
ranges and don't overthink it.