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  1. Qt
  2. QTBUG-95334

QMap<QString,QString>::const_iterator cannot do "it+1" any more

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    • cc584c59de644195ae0c4f7f99ad428e189df07d (qt/qtbase/dev) 62b4c9169c23f510747a384fe3f1ed78bee4b435 (qt/qtbase/6.2)

      I have the following piece of code which worked well in Qt 5:

                  QMap<QString,QString>::const_iterator i;
            for (i=ride->tags().constBegin(); i != ride->tags().constEnd(); i++) {

                    out << "\t\t\t\"" << i.key() << "\": \"" << protect(i.value()) << "\"";
                    if (i+1 != ride->tags().constEnd()) out << ",\n";
                    else out << "\n";
            }

      In Qt6, "i+1" is not possible any more. I get the error message:

      FileIO/Snippets.cpp:149:26: error: no match for ‘operator+’ (operand types are ‘QMap<QString, QString>::const_iterator’ and ‘int’)
  149 |                     if (i+1 != ride->tags().constEnd()) out << ",\n";

      And I cannot find anything related in the porting guides
      https://doc.qt.io/qt-6/portingguide.html
      or
      https://doc.qt.io/qt-6/qtcore-changes-qt6.html

      Please bring back the "i+1" capability or provide guidance in the porting docs.

        For Gerrit Dashboard: QTBUG-95334
        # Subject Branch Project Status CR V
        314208,4 QMap: add operator+ and - for iterators dev qt/qtbase Status: MERGED +2 0
        362150,2 QMap: add operator+ and - for iterators 6.2 qt/qtbase Status: MERGED +2 0

            peppe Giuseppe D'Angelo
            andreasbuhr Andreas Buhr
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              Created:
              Updated:
              Resolved:

                There are no open Gerrit changes