[Qt-interest] qobject_cast<> questions

[Thiago Macieira]

Ross Bencina wrote:
>Hi Thiago
>
>>Please bear in mind that we cannot and will not document every single
>>aspect of the behaviour of Qt. There are things that will always be
>> left unexplained and undocumented, as a way of leaving the engineers
>> some manoeuvring room when expanding the API.
>
>I appreciate that.. but I would think a mechanism as fundamental as
>qobject_cast<> should be specified with the same rigor as dynamic_cast<>
> in C++. Even if just to add a line to the docs "if you pass 0 the
> behavior is undefined, don't do it!" -- at least then I would know to
> not call it with a 0 parameter (even though I can do that with
> dynamic_cast). These kind of edge cases are where the bugs often happen
> as you know.

I would add that line, if it were the case.

But I argue that we shouldn't need to document when things work exactly as 
expected. If qobject_cast is meant to work as a replacement for 
dynamic_cast, then it should work like it.

-- 
Thiago Macieira - thiago.macieira (AT) nokia.com
  Senior Product Manager - Nokia, Qt Software
      Sandakerveien 116, NO-0402 Oslo, Norway
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