From: "Stephane Barbey" <Stephane@Paranor.ch>
Subject: Re: Inheritance and Polymorphism in Ada !!
Date: 1999/10/15
Date: 1999-10-15T08:38:59+00:00 [thread overview]
Message-ID: <7u6p73$pgi$1@pollux.ip-plus.net> (raw)
In-Reply-To: 3806DC34.1513E8B1@frqnet.de
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Andreas Winckler <andreas.winckler@frqnet.de> wrote in message
news:3806DC34.1513E8B1@frqnet.de...
> See line 16, the type of the referenced object must be known in advance.
> With "pointer.second_field :=1" the compiler fails. It seems that the
> strong typing restricts the features of polyormism in Ada. Any comments?
This would be illegal in all other OO languages I know of.
For instance, in Java:
public class A {
int first_field;
}
public class B extends A {
int second_field;
}
import A;
import B;
public class inheritance_polymorphism {
public static void main(String[] args) {
A pointer = new B();
pointer.second_field = 1; /* illegal */
((B)pointer).second_field = 1; /* legal */
}
}
-St�phane
----
Stephane Barbey, PhD phone: +41(31)828.92.17
Paranor AG fax: +41(31)828.92.99
3046 Wahlendorf stephane@paranor.ch
Switzerland http://lglwww.epfl.ch/~barbey
next prev parent reply other threads:[~1999-10-15 0:00 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-10-15 0:00 Inheritance and Polymorphism in Ada !! Chango Cho
1999-10-15 0:00 ` Andreas Winckler
1999-10-15 0:00 ` tmoran
1999-10-15 0:00 ` tmoran
1999-10-15 0:00 ` Richard D Riehle
1999-10-15 0:00 ` Matthew Heaney
1999-10-15 0:00 ` Richard D Riehle
1999-10-18 0:00 ` Robert Dewar
1999-10-23 0:00 ` Richard D Riehle
1999-10-24 0:00 ` Robert Dewar
1999-10-24 0:00 ` Brian Rogoff
1999-10-26 0:00 ` Robert Dewar
1999-10-25 0:00 ` Robert A Duff
1999-10-26 0:00 ` Robert Dewar
1999-10-26 0:00 ` Robert A Duff
1999-10-18 0:00 ` Robert A Duff
1999-10-19 0:00 ` Robert Dewar
1999-10-20 0:00 ` Robert A Duff
1999-10-21 0:00 ` Robert Dewar
1999-10-21 0:00 ` Paul Duquennoy
1999-10-21 0:00 ` Simon Wright
1999-10-21 0:00 ` Robert A Duff
1999-10-22 0:00 ` Matthew Heaney
1999-10-15 0:00 ` Stephane Barbey [this message]
1999-10-15 0:00 ` Matthew Heaney
1999-10-18 0:00 ` Robert A Duff
1999-10-18 0:00 ` Brian Rogoff
1999-10-15 0:00 ` Lutz Donnerhacke
1999-10-18 0:00 ` Robert A Duff
1999-10-15 0:00 ` Ted Dennison
1999-10-15 0:00 ` Lutz Donnerhacke
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