[fpc-pascal] Move with pointers to memory

[Frederic Da Vitoria]

2013/11/13 Rainer Stratmann <rainerstratmann at t-online.de>

>  On Wednesday 13 November 2013 09:39:27 you wrote:
> >
> > Move (S^, D^, L)
> >
> > should do it.
> >
> > Tomas
>
> Yes, thanks.
>
> I am confused with the meaning of
>
> const source;
>
> and
>
> var dest;
>
> Is there a description of the behaviour of const and var in this case?
> Why is it not both const or both var?
>

"source" is where the data "comes from", so the procedure won't modify it
(if there is no memory overlap between source and dest), so it is declared
as "const"
"dest" is where the data is copied to, so the procedure will necessarily
modify it (if "count" is <> 0), and the procedure should modify so it is
declared as "var". Actually, IMO it could be declared as "out", this would
avoid a meaningless warning.

-- 
Frederic Da Vitoria
(davitof)

Membre de l'April - « promouvoir et défendre le logiciel libre » -
http://www.april.org
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