an ability to convert an arbitrary QVariant to QString only makes not too
much sense. an ability to convert QVariant to an arbitrary type sounds more
useful to me.
i.e.
class A { .. };
class B : public A { .. };
class C : public A { .. };C c; QVariant v = qVariantFromValue(c); // and Q_ASSERT(v.canConvert<A>()); A a = v.value<A>(); // instead of Q_ASSERT(v.canConvert<A>() || v.canConvert<B>() || v.canConvert<C>()); A a; if (v.canConvert<C>()) a = v.value<C>(); else if (v.canConvert<B>()) a = v.value<B>(); else if (v.canConvert<A>()) a = v.value<A>(); BTW, there is a task for this exists at the bug tracker: http://bugreports.qt.nokia.com/browse/QTBUG-14940 regards, Konstantin 2011/7/14 Jerome Vizcaino <[email protected]> > Hi, > > I use QVariant a lot in Qt4 to store native but also custom types. > One thing I find a bit annoying is that there is no way to "extend" the > toString() QVariant functionnality. > > How about adding some sort of operator (à la QDataStream) that custom types > could provide to help QVariant convert to/from string ? > > This would be really convienent in order to easily print QVariant without > actually knowing if it's custom or native content. > > Jérôme > _______________________________________________ > Qt5-feedback mailing list > [email protected] > http://lists.qt.nokia.com/mailman/listinfo/qt5-feedback >
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