[Kde-pim] [RFC] Contact specific Akonadi API

[robert at narnia.homeunix.com]

> I am still not convinced that this is a suffiently big gain.
>
> job->payload<Addressee>();
>
> is not significantly more difficult then
>
> job->addressee();
>
> Templated getters are quite common in C++ APIs, including Qt (e.g.
> QVariant::value())

I had to use these kinds of getters in a kpilot patch recently (the 
hasPayload and payload methods) and I feel like they are particularly 
prone to programming errors.  For instance, if you put use the wrong class 
in for the hasPayload template, the method fails silently and doesn't 
generate any kind of compile time (or runtime) warning.  I'm not saying 
that we shouldn't use them.  Just that, if we do, we should take some 
precautions.

--Robert
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