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  1. Qt
  2. QTBUG-114317

QStringBuilder does not necessarily preserve nullness

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    • Icon: Bug Bug
    • Resolution: Fixed
    • Icon: P2: Important P2: Important
    • 6.7
    • 6.6
    • Core: QString and Unicode
    • None
    • 6b8106383228785bf7a184d01f8c9692dd91e6c0

      Another variation of QTBUG-114238:

      QString s; 
QVERIFY(s.isNull());

QString r1 = s % s;
QVERIFY(r1.isNull());
QString r2 = s % s % s;
QVERIFY(r2.isNull()); // FAIL

      r1 is null because of the special case of QStringBuilder between QStrings. But r2 isn't null, because QStringBuilder builds a 0-length uninitialized string (using QString result(0, Qt::Uninitialized), and that constructor never creates null strings.

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            thiago Thiago Macieira
            peppe Giuseppe D'Angelo
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              Created:
              Updated:
              Resolved:

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