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From: Ted Dennison <dennison@telepath.com>
Subject: Re: Searching for an object
Date: 2000/08/21
Message-ID: <8nrh3t$ht9$1@nnrp1.deja.com>#1/1
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Date: 2000-08-21T00:00:00+00:00
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In article <87og2q9yyp.fsf@moon.mteege.de>,
  Matthias Teege <matthias@mteege.de> wrote:
> I've defined the following type:
>
> type customer is record
>    aname  : String( 1..25);
>    bname  : String( 1..25);
> end record;

This looks shaky right from the start. How do you know how many
characters in these fields are valid? Ada string handling doesn't rely
on special "terminator" characters at the end of the strings. You either
dynamicly size the string to hold the exact number of characters you
will need for the data, you keep around a "length" variable with the
string, or you use one of the types in the Ada.Strings.* packages.


> 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.

Is object supposed to be some global variable? Otherwise, this looks
like you are familiar with "object" notation in some other "OO"
languages, and are looking for the same notation in Ada. Eg: you want
to call Object.Find (...) rather than Find(Object, ...) Is that your
question?

--
T.E.D.

http://www.telepath.com/~dennison/Ted/TED.html


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