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  1. Qt
  2. QTBUG-135330

QVariant assigned from null QString becomes non-null QVariant

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Details

    • Bug
    • Resolution: Invalid
    • Not Evaluated
    • None
    • 6.8.2
    • Core: Containers and Algorithms
    • None
    • Linux/Wayland

    Description

      I have this short example to reproduce:

      int main(int argc, char *argv[])
{
    QString value;
    qDebug() << value << value.isNull();

    QVariant var = value;
    qDebug() << var << var.isNull();

    return 0;
}

      When compiled with Qt 5.15.2, the result is:

      "" true
QVariant(QString, "") true

      and with 6.8.2 it's:

      "" true
QVariant(QString, "") false

      In other words, QString->QVariant conversion loses null/non-null information and it can be critical - it basically loses data.

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            thiago Thiago Macieira
            vipe Vipe
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            Dates

              Created:
              Updated:
              Resolved:

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