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  1. Qt
  2. QTBUG-89002

[REG 5.15 -> 6.0.0] Crash when using iterators to default constructed QString

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P1: Critical
    • Resolution: Invalid
    • Affects Version/s: 6.0.0 Beta2
    • Fix Version/s: None
    • Labels:
      None

      Description

      The following test crashes in Qt 6:

      void tst_QString::std_mismatch()
      {
          const QString s1("blabla");
          const QString s2;
          const auto mismatches = std::mismatch(s1.begin(),
                                                s1.end(),
                                                s2.begin());
          const int commonPrefixCount = mismatches.first - s1.begin();
          QCOMPARE(commonPrefixCount, 0);
      }
      

      The above test works fine in Qt 5.15

      Please see https://codereview.qt-project.org/c/qt/qtbase/+/324200

      This issue is a result of investigation on: QTCREATORBUG-24970

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          # Subject Branch Project Status CR V

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              Assignee:
              thiago Thiago Macieira
              Reporter:
              jkobus Jarek Kobus
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                Updated:
                Resolved:

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