[Development] QList for Qt 6

[Eike Ziller]

> On 27. May 2019, at 12:49, Lars Knoll <lars.knoll at qt.io> wrote:
> 
>> On 27 May 2019, at 11:37, Giuseppe D'Angelo <giuseppe.dangelo at kdab.com> wrote:
>> 
>> Il 27/05/19 10:24, Simon Hausmann ha scritto:
>>> Hi,
>>> I’m very much in favor of having QList be an alias for QVector and try it out, in qt5, with creator and KDE.
>> 
>> Could someone please summarize where we are inside this thread? Now I'm completely lost…
> 
> My summary would be as follows:
> 
> * We rename QList to QArrayList
> 	* We can still discuss whether it should rather be Qt5::QList
> * QStringList and QBAList will be implemented using QVector
> * QList becomes an alias to QVector in wip/qt6 (for now at least)
> * We delay the decision on what QList will be in Qt 6 for a little while
> * QVector for Qt 6 will most likely be updated with the changes Thiago has waiting since quite some years

What is the summary for these?

> * To be able to reach a decision:
> 	* we test some Qt libs and apps with QList being an alias to QVector
> 	* We know that the only source incompatibility is the stability of references

At least the following are source incompatibilities currently (though easily noticeable because they generate compile errors):

- QVector doesn’t have to/fromSet, to/fromStdList or (obviously) to/fromVector
- QVector requires the value type to be default constructible 

> 	* If it turns out that most of Qt and (maybe also KDE) run without problems with QList = QVector, we should IMO go down that route.
> 	* The reason is that aliasing those classes will resolve many other problems we could otherwise run into
> 
> Cheers,
> Lars
> 
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Eike Ziller
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