[lazarus] "Variant" variable ?
Michael Van Canneyt
michael.vancanneyt at wisa.be
Thu Apr 27 03:29:24 EDT 2000
On Thu, 27 Apr 2000, Marc Weustink wrote:
> At 23:20 26-04-2000 +0200, Michael Van Canneyt wrote:
>
> >It is in the Case statement.
> >
> >Case A : Integer of
> > 1 : (X : String;);
> > 2 : (Y : Longint);
> >end;
> >
> >If A=1 then you can access X as a string
> >If A=2 then you can access Y as a Longint.
>
> Is there a check on this? I allways thought that 1 and 2 are just
> placeholders?
There is no check; you must do the check. The point is that there are 2 constructs
Case A : Integer of
1 : (X : String;);
2 : (Y : Longint);
end;
Here you can set A and thus have an indication which of X or Y you should access.
(i.e. A is a normal field of the record)
On the other hand
Case Integer of
1 : (X : String;);
2 : (Y : Longint);
end;
doesn't allow to determine what you should access, because there is no 'A' field.
Michael.
>
> Marc
>
>
>
>
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