From: Gerald Kasner <Gerald.Kasner@Physik.Uni-Magdeburg.de>
Subject: Re: Searching for an object
Date: 2000/08/21
Date: 2000-08-21T00:00:00+00:00 [thread overview]
Message-ID: <39A10328.6DD7B9F7@Physik.Uni-Magdeburg.de> (raw)
In-Reply-To: 87og2q9yyp.fsf@moon.mteege.de
Matthias Teege schrieb:
>
> Moin,
>
> I've defined the following type:
>
> type customer is record
> aname : String( 1..25);
> bname : String( 1..25);
> end record;
>
> Then I create some objects of this type and save all of
> them in an table.
>
> Now I want to find a special object with a find procedure
> like this (not authentic Ada Code :-)):
>
> procedure find ( Field : in String;
> What : in String;
> Result: out String) is
>
> while end_of_table is false loop
> read(object);
> if object.Field = What then -- field should be 'aname'
> -- or 'bname'
> Result := object.Field;
> exit; -- We have found it
> end if
> end loop;
> end find;
>
> I want to search in all Record "Fields" depend on the
> procedure parameter.
>
> How is the Ada way?
>
> Many thanks
> Matthias
>
> --
> Matthias Teege -- matthias@mteege.de -- http://emugs.de
> make world not war
> PGP-Key auf Anfrage
My respose is no direct answer to your question, but I would
be more careful about the find procedure in general. If you have
a long table of customers you'll have to wait very long times.
Consult a textbook on data structures how to do this much faster.
(In your case a tree may be very useful)
A second remark: Ada is designed to reuse code. Why not using
already existing well tested libraries ? Abstract data types
seem to be appropriate.
-Gerald
next prev parent reply other threads:[~2000-08-21 0:00 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-08-18 0:00 Searching for an object Matthias Teege
2000-08-21 0:00 ` Ted Dennison
2000-08-21 0:00 ` Matthias Teege
2000-08-21 0:00 ` Ted Dennison
2000-08-21 0:00 ` tmoran
2000-08-22 0:00 ` Matthias Teege
2000-08-22 0:00 ` tmoran
2000-08-21 0:00 ` Gerald Kasner [this message]
2000-08-21 0:00 ` Matthias Teege
2000-08-31 21:55 ` John McCabe
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