Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-83415

QLocale::setDefault without effect for number options

XMLWordPrintable

    • macOS
    • c7420d9cb8e15d1f094fa92cfab635a86246c670 (qt/qtbase/dev) c39dbabde9d98b805f1d1884d3aeee5c8dcb4d03 (qt/qtbase/5.15)

      The QLocale::setDefault function seems to have no effect, at least with number options. I didn't test other options yet. This affects the default construction of a QLocale object as well as QString::arg. See the example code (also attached as project), which doesn't output what is expected according to the documentation.

      Example code:

      // setup a custom locale
QLocale customLocale( QLocale::English );
customLocale.setNumberOptions( QLocale::OmitGroupSeparator | QLocale::OmitLeadingZeroInExponent |
                               customLocale.numberOptions() );

// Set the custom locale as default
// https://doc.qt.io/qt-5/qlocale.html#setDefault
QLocale::setDefault( customLocale );

// using the custom locale directly
// https://doc.qt.io/qt-5/qlocale.html#toString-8
QString str1 = customLocale.toString( d );
qDebug() << str1;

// using the default locale which was set to be the custom locale is supposed to give the same output!
// https://doc.qt.io/qt-5/qlocale.html#QLocale
QLocale loc;
QString str2 = loc.toString( d );
qDebug() << str2;

// Arg is also supposed to use the default locale according to its documentation.
// https://doc.qt.io/qt-5/qstring.html#arg-9
QString str3 = QString( "%1" ).arg( d );
qDebug() << str3;

      Output:

      "5e-7"
"5e-07"
"5e-07"

      Expected:

      "5e-7"
"5e-7"
"5e-7"

      Note that with Qt 5.9.1 the output is as expected!

      Note: I could only test this using the Xcode platform SDK 10.13 and 10.15, with which Qt 5.14.2 outputs warnings about being not officially supported.

        1. qtbug83415.zip
          2 kB
          boernsen
        No reviews matched the request. Check your Options in the drop-down menu of this sections header.

            Eddy Edward Welbourne
            boernsen boernsen
            Votes:
            0 Vote for this issue
            Watchers:
            2 Start watching this issue

              Created:
              Updated:
              Resolved:

                There are no open Gerrit changes