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  1. Qt
  2. QTBUG-65939

QString::compare yields different results for null or empty string

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Details

    • Bug
    • Resolution: Done
    • P1: Critical
    • 5.10.1
    • 5.10.0
    • Core: QString and Unicode
    • None
    • Qt 5.10.0, Win32
    • ea6675374fa6e94bd4cf10613c85cee2c724bcdc

    Description

      We discovered that QString::compare handles null and empty strings differently:

          QString nullString;
    QString otherData("Some text");
    int nResult1 = nullString.compare(otherData, Qt::CaseInsensitive);
    QString emptyString("");
    int nResult2 = emptyString.compare(otherData, Qt::CaseInsensitive);

      With Qt 5.10 nResult1 equals 9 and nResult2 equals -1. In previous versions, e.g. 5.7, both results were equal -1;

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            thiago Thiago Macieira
            phbaer Philipp Baer
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            Dates

              Created:
              Updated:
              Resolved:

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