Re: Ada 200X

[Vinzent Hoefler <ada.rocks@jlfencey.com>]

Bill Findlay wrote:

>On 2/6/03 16:04, in article bbfp40$90vu6$1@ID-175126.news.dfncis.de,
>"Vinzent Hoefler" <ada.rocks@jlfencey.com> wrote:
>
>> Hyman Rosen wrote:
>> 
>>> I'm given to understand that Ada is meant to be
>>> for the convenience of the reader, not the writer. It may be
>>> more work for you to look up the ancestor, but then the reader
>>> of the code will know exactly where to look for the code.
>> 
>> Yes, it's ok for the first time you have to write it.
>> The problem sometimes is that all these view conversions should be
>> changed when you make a change to the object hierarchy and insert
>> another object, 
>
>Might you not want to invoke the original parent in some cases, and in other
>cases the newly-interposed parent?

Maybe, yes. Usually not, because in that case it would simply become a
completely new derived object then.

>It seems that is an issue calling for at
>least a careful review of all the types in that lineage, during which such
>hand-offs should be reconsidered, rather than just taking it for granted
>that the default given by 'super' is the right one.

Well, you should do such review anyway. IME, having something like
"inherited" just would make the changes easier and at least in the
cases *I* encountered thus far, less error prone. Not that I really
miss that, I could get along without that feature in Turbo Pascal 6,
but later when I got TP7 I used it quite often. It turned out to be
more easy especially in ever changing code (which, of course, you
should never have with a good design in the first place).
So sometimes I forgot the change and had an object that didn't
properly initialize its new properties because its constructor wasn't
called at all, just because the call to the parent's method directly
"skipped" to the grandfather.

Well, as I said, YMMV.


Vinzent.

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