Pointer dereference

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2 total messages Started by Jason Grace Mon, 04 Oct 2004 16:01

#26

Author: Jason Grace
Date: Mon, 04 Oct 2004 16:01

16 lines
976 bytes

Say, you declare:

R = Record
  X, Y: integer;
  S: string;
end;

P = ^R;


...


You then dereference the above S by P^.S, correct?

Sometimes I will see just P.S, without the ^.  When is this legal?

Re: Pointer dereference

#27

Author: Skybuck Flying
Date: Wed, 06 Oct 2004 00:46

44 lines
1740 bytes

"Jason Grace" <jgrace5@hotmail.com> wrote in message
news:642169be.0410040801.5e72b647@posting.google.com...
> Say, you declare:
>
> R = Record
>   X, Y: integer;
>   S: string;
> end;
>
> P = ^R;
>

Actually it something like

Type
    Pr
    Tr = record
        x,y : integer;
        s : string;
     end;

var
    p : Pr;

p := @r;

p^

>
>
> You then dereference the above S by P^.S, correct?

Yep.

>
> Sometimes I will see just P.S, without the ^.  When is this legal?

Since a certain delphi version.

P.S doesn't mean anything for a pointer so it might as well be
interpreted/compiled as P^.S ;)

Less typing required ;) It depends on which style once prefers I guess ;)

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