Consistency between null QJsonValue and QVariant

Moia

Suppose to have QJsonValue with a null type and then convert it to QVariant. This QVariant converted has type std::nullptr_t. It's just me or does not exists a way to instantiate a QVariant which match that type?

QJsonValue value{QJsonValue::Null};
QVariant variant = value.toVariant();

qDebug() << value << variant;     //  QJsonValue(null) QVariant(std::nullptr_t, (nullptr))
qDebug()  << variant.isNull() << variant.isValid();     //  true true
qDebug() << variant.type() << variant.typeName();       // QVariant::std::nullptr_t std::nullptr_t

JonB

@Moia
I don't understand: you have instantiated a QVariant with that type, via your QVariant variant = value.toVariant();?

Moia

How can I create a QVariant with the same state Variant(std::nullptr_t, (nullptr)) ?

JonB

@Moia
Like I said, there may be other ways, but you already have done just this with your:

QJsonValue value{QJsonValue::Null};
QVariant variant = value.toVariant();

?

Bonnie

Maybe @Moia want a method to get that QVariant without a QJsonValue?
By looking into the source code of QJsonValue, you can see that value comes from

QVariant::fromValue(nullptr)

Unsolved Consistency between null QJsonValue and QVariant