Pimpl copying

[Thiago Macieira]

Peter Kümmel wrote:
>Matthias Kretz wrote:
>> On Tuesday 18 July 2006 14:26, Peter Kümmel wrote:
>>> BTW the cast is the price they pay for their Private "Hinterwelt",
>>> means there is a second class hierarchy behind the scene.
>>
>> The cast is a noop (reinterpret_cast) and therefore not a price payed
>> in performance.
>
>I wonder if a static_cast would not be enought.

Not without defining both classes, so that the compiler knows that there 
is an inheritance tree. I think.

>> The cast is safe as long as you don't use multiple inheritance.
>
>Qt: "What is multiple inheritance?"  ;)

Not only does Qt use multiple inheritance in some parts, it also has 
provisions for it in the meta object system. Think of Q_GADGET and the 
plugin architecture.

The only thing that you're not allowed to do is inherit from QObject 
multiply -- that is, diamond-shaped multiple inheritance.

-- 
  Thiago Macieira  -  thiago (AT) macieira.info - thiago (AT) kde.org
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