> Sent: Wednesday, June 09, 2021 at 3:34 AM > From: "Allan Sandfeld Jensen" <[email protected]> > To: [email protected] > Cc: "Thiago Macieira" <[email protected]> > Subject: Re: [Interest] QJsonDocument::fromVariant failing with list > > On Dienstag, 8. Juni 2021 23:47:50 CEST Thiago Macieira wrote: > > On Tuesday, 8 June 2021 13:57:53 PDT Jason H wrote: > > > Which is neiher what I acually had but performs the same bad conversion as > > > what I had. I am not sure why the QVariantList vs QList have different > > > fidelity - the one with more fidelity - QList - actually has has less > > > specificity. > > > > Because that's how C++ works. > > > > QList is not a type, it's a template. Neither QVariant nor QJsonDocument can > > know all possible QList instantiations. So they have coded only a few > > (QVariantList and QStringList only, possibly QVector<QVariant> and > > QVector<QString> in Qt 5 too, I don't remember). > > I guess our system could detect QList<QVariant> as QVariantList and > QList<QString> as QStringList. They should be binary identical anyway.
That is what I was expecting. I thought they were just a typedef? (Though I am lying there, I know QStringList inherits from QList<QString>) The instant case of QList<QVariant> is just a typedef though, so I am confused as why it wasn't working. I thought typedefs were indistinguishable? The expressiveness of C++11 initializers of creating objects that end up in CBOR and JSON for I/O, and QVariant based trees (incl arrays) for in-app databases is just awesome. But then you get someone wielding C++ clumsily like me. :-) I attempted to summarize and filed https://bugreports.qt.io/browse/QTBUG-94371 _______________________________________________ Interest mailing list [email protected] https://lists.qt-project.org/listinfo/interest
