Re: kabc question

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Am Dienstag, 28. Mai 2002 22:33 schrieb Cornelius Schumacher:
> > Can't we introduce a startNoDetach() and an endNoDetach() function to
> > prevent this kind of unnecessary copying from taking place? (or
> > invent some other way to set multiple data fields at once without
> > detach()ing)
>
> What about the attached patch?

Ahh, obvious thing, of course. Could have thought of that myself. 

If you use something like 

void setEmail(KABC::Addressee a, QString mail) { a->insertEmail(mail); }

void doSync(...) {....
        setEmail(myAddressee, "test@xxxxxxxxxx");
        setEmail( myAddressee, "test2@xxxxxxxxxxxxxxxxxx");
}

doesn't the by-value call to setEmail create a copy of the myAddressee? (You 
see, my theoretical C++ knowledge is not so profound, it's just what I 
remember from reading Stroustrup some long time ago). If so, does a 
definition like

void setEmail(KABC::Addressee &a, QString mail) {...}

prevent this, since the Addressee is passed by reference? If so, with your 
patch one really needs to take care to use the &a in all methods!

I still think your patch is the correct and clean solution to the problem, we 
just need to make sure developers understand that they need to pass by 
reference if they don't want to do some unnecessary stuff.

Reinhold
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