[Interest] C++11 enum class and QSettings

[Bob Hood]

I'm trying to save a C++11 enum class value in a QSettings.  In a header I have:
    #include <QMetaType>

    enum class ReportStacking
    {
        Stacked,
        Intermixed
    };
    Q_DECLARE_METATYPE(ReportStacking)

And then in the module, using a data member of this type:

    ReportStacking report_stacking = ReportStacking::Intermixed;

I've tried both:

    QVariant var;
    var.setValue(report_stacking);
    settings.setValue("report.stacking", var);

and:

    settings.setValue("report.stacking", QVariant::fromValue(report_stacking));

and I'm getting a run-time error:

    QVariant::save: unable to save type 'ReportStacking' (type id: 1027).

    ASSERT failure in QVariant::save: "Invalid type to save", file 
kernel\qvariant.cpp, line 2144
    Debug Error!

    Program: Q:\Qt\5.6.2\64_dll\bin\Qt5Cored.dll
    Module: 5.6.2
    File: global\qglobal.cpp
    Line: 3026

    ASSERT failure in QVariant::save: "Invalid type to save", file 
kernel\qvariant.cpp, line 2144

Is there a Qt-base way of storing C++11 enum class types, or do I have to do 
some manual coding to map a ReportStacking class value to an int for QSettings 
to digest?
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