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Re: [CPROG] pointer gymnastik



Kim Pedersen <sslug@sslug> skrev:

> >En streng incrementerer lineært? *p++ har anden sideeffekt på p end
> >p++ har?

>  *p og p er jo overhovedet ikke det samme. Hvad der er ment er at en
> compiler måske siger at
>  hele strengen skal lagres lige efter hinanden ( hver karakter ), mens en
> anden måske lægger karakterene på 10 forskellige adresser hvorved den
> eneste måde at incrementere på via en pointer for at få det rigtige
> resultat vil være: p++.

p++ forøger p og returnerer den værdi, den havde før

*p++ forøger p og returnerer det, den pegede på

Da vi ikke bruger returværdien er deres virkning altså ens. Så kan jeg
ikke se, hvorledes hukommelsesopbygningen har noget at sige. Og jeg
tvivler i øvrigt på, at det er lovligt for en compiler at lægge et
array ud som det vil.
-- 
Regards, Anders                         If a Microsoft product
(address is valid)                      fails, who do you sue?


 
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