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From: lutz@iks-jena.de (Lutz Donnerhacke)
Newsgroups: comp.lang.ada
Subject: Re: A generic list package
Date: Thu, 20 Sep 2001 08:21:50 +0000 (UTC)
Organization: IKS GmbH Jena
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* Simon Wright wrote:
>lutz@iks-jena.de (Lutz Donnerhacke) writes:
>> >lutz@iks-jena.de (Lutz Donnerhacke) writes:
>> >> I prefer this the other way around:
>> >> 
>> >>         +------------------+
>> >>         |    actual data   |
>> >>         |                  |
>> >>         | fields specific  |
>> >>         | to the container |
>> >> 
>> >> This allows me to cast pointers ;-)
>
>What makes you think that the order the compiler lays out the record
>is the same as the order you wrote the components in?

The tagged record type to be extened is already finalized. I do not care how
the compiler adds the data structure componds, but (automatic) type
conversions between parent and derivated types become very difficult if the
extension fields are mixed with the parent ones.

In conclusion: I program unportable unless I find the rule in the RM.

-- 
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