Ask for Access operator

Ask for Access operator

[carlos]

I am learning ADA and I am trying to
use a operator similar to '&' operator
of C language. I used 'access but it is
not working for integers. What can I do?




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Re: Ask for Access operator

[Ted Dennison]

In article <06284168.a35ad676@usw-ex0109-068.remarq.com>,
  carlos <ccaresNOccSPAM@ufro.cl.invalid> wrote:
> I am learning ADA and I am trying to
> use a operator similar to '&' operator
> of C language. I used 'access but it is
> not working for integers. What can I do?

Given your admitted lack of expertise, I think it might be best if you
took a step back told us *why* you want to do that. In C you have to
take the address of variables a lot, due to nasty limitations in the
language. In Ada you very rarely need to do that.

--
T.E.D.

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


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Re: Ask for Access operator

[Pete]

if you are using ada95 try this

type Int_Ptr is access all Integer;
Data : aliased Integer := 5;
I_Ptr : Int_Prt;
I_Ptr := Data'Access

depending on the scope of the variables you may have to use
Data'Unchecked_Access




"carlos" <ccaresNOccSPAM@ufro.cl.invalid> wrote in message
news:06284168.a35ad676@usw-ex0109-068.remarq.com...
> I am learning ADA and I am trying to
> use a operator similar to '&' operator
> of C language. I used 'access but it is
> not working for integers. What can I do?
>
>
>
>
> * Sent from AltaVista http://www.altavista.com Where you can also find
related Web Pages, Images, Audios, Videos, News, and Shopping.  Smart is
Beautiful

Re: Ask for Access operator

[Robert Dewar]

In article <ObhR4.4795$C9.100771@typhoon.nyroc.rr.com>,
  "Pete" <tyrone@nowhere.org> wrote:

> if you are using ada95 try this
>
> type Int_Ptr is access all Integer;
> Data : aliased Integer := 5;
> I_Ptr : Int_Prt;
> I_Ptr := Data'Access

Oh dear! Ted's answer was just spot on here, and I wondered
to him off line if someone would post an answer like the
above.

This is almost CERTAINLY wrong advice. It almost CERTAINLY
leads to writing junk C-in-Ada style code. There are very few
cases in which it is legitimately appropriate to use aliased
variables and the Access operator. When you need these features
they are valuable, but they are also very dangerous because
they encourage a nasty low level style of coding that is
quite familiar to C programmers, but quite inappropriate in
Ada. If you are going to learn Ada, you want to learn how to
write Ada in Ada style. If you want to write C, you might
as well write in C :-)

I must say that I see huge overuse of 'Access and aliased in
a lot of Ada95 code.


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Re: Ask for Access operator

[carlos]

I really appreciate all answers
given here. I am doing just some
specific language contrasts and
all your opinions means a help


thanks a lot


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Re: Ask for Access operator

[Ted Dennison]

In article <27c7f3b0.6787226b@usw-ex0109-068.remarq.com>,
  carlos <ccaresNOccSPAM@ufro.cl.invalid> wrote:
>
> I really appreciate all answers
> given here. I am doing just some
> specific language contrasts and
> all your opinions means a help

All the more reason for you to tell us exactly what kind of thing you
are trying to do. Ada will compare very badly if you try to implement C
problem-solving techniques directly in Ada. Far better would be to
compare Ada techniques vs. C (or language X) techniques.

Being (presumably) a non-native English speaker yourself, surely you can
understand this. If you were to just write down what you wanted to say
in your native toungue (Spanish?), then try to translate every single
word you wrote into English one at a time, the result would not make
much sense at all to me.

--
T.E.D.

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


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Re: Ask for Access operator

[Robert Dewar]

In article <27c7f3b0.6787226b@usw-ex0109-068.remarq.com>,
  carlos <ccaresNOccSPAM@ufro.cl.invalid> wrote:
>
> I really appreciate all answers
> given here. I am doing just some
> specific language contrasts and
> all your opinions means a help


Then contrast high level capabilities, not low level features,
or you will get a completely distorted viewpoint.


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