[Development] HEADS UP: Don't use QList, use Q_DECLARE_TYPEINFO

[Matthew Woehlke]

On 2015-07-21 01:06, Thiago Macieira wrote:
> On Tuesday 21 July 2015 02:26:41 Kevin Kofler wrote:
>> For the implicitly shared data types, QList actually does NOT add another 
>> layer of indirection (as documented: "If T is itself a pointer type or a 
>> basic type that is no larger than a pointer, or if T is one of Qt's shared 
>> classes, then QList<T> stores the items directly in the pointer array."),
>> so  in that case, it is almost the same as QVector, except that it allows
>> prepending items much more efficiently (O(1) in many cases, whereas it's
>> always O(n) in QVector).
> 
> Except if the type is larger than sizeof(void*), like QVariant is.
> 
> Or like QString and QByteArray will be in Qt 6.

Are these still implicitly shared? Is it possible to have Qt type traits
on a type T such that QList<T> will always be QVector-like? Or would it
be impossible to support that in QList? (This would be for Qt 6, obviously.)

It seems like it would be useful for any shared-data class to be
QVector-like in QList, even if larger than a single pointer. (At least,
have the ability to make such a type thusly.)


...Is QStringList going to become a QVector<QString>?

-- 
Matthew