Qt meta property ULongLong -> enum conversion tests

main.cpp

#include "main.h"
#include <QCoreApplication>
#include <QVariant>
#include <QMetaProperty>
#include <QDebug>

// set -> get via property()
static void test1 (int type) {
    for (Example::Color c : {Example::Red, Example::Green, Example::Blue}) {
        Example x;
        QVariant v = c;
        v.convert(type);
        x.setProperty("color", v);
        QVariant newv = x.property("color");
        assert(newv.toInt() == x.property("color").toInt());
        qDebug() << ((newv == c)?"pass":"FAIL") << type << c << v << newv;
    }
}

// set -> get via meta property
static void test2 (int type) {
    QMetaProperty prop;
    for (int k = 0; k < Example::staticMetaObject.propertyCount(); ++ k) {
        prop = Example::staticMetaObject.property(k);
        if (!strcmp("color", prop.name()))
            break;
    }
    for (Example::Color c : {Example::Red, Example::Green, Example::Blue}) {
        Example x;
        QVariant v = c;
        v.convert(type);
        prop.write(&x, v);
        QVariant newv = prop.read(&x);
        assert(x.property("color") == prop.read(&x));
        assert(newv.toInt() == prop.read(&x).toInt());
        qDebug() << ((newv==c)?"pass":"FAIL") << type << c << v << newv;
    }
}

static void test3 (int type) {
    for (Example::Color c : {Example::Red, Example::Green, Example::Blue}) {
        QVariant v = c;
        v.convert(type);
        Example::Color newc = qvariant_cast<Example::Color>(v);
        qDebug() << ((newc==c)?"pass":"FAIL") << type << c << v << newc;
    }
}

int main(int argc, char *argv[]) {

    QCoreApplication a(argc, argv);

    for (auto test : {test1, test2, test3}) {
        qDebug() << "---";
        test(QVariant::Int);
        test(QVariant::UInt);
        test(QVariant::LongLong);
        test(QVariant::ULongLong);
    }

}

main.h

#ifndef MAIN_H
#define MAIN_H

#include <QObject>

class Example : public QObject {
    Q_OBJECT
public:
    enum Color { Red, Green, Blue, None };
    Example () : color(None) { }
    Q_ENUM(Color)
    Q_PROPERTY(Color color MEMBER color)
private:
    Color color;
};

#endif // MAIN_H

Qt 5.15.2 Output.txt

---
pass 2 Example::Red QVariant(int, 0) QVariant(int, 0)
pass 2 Example::Green QVariant(int, 1) QVariant(int, 1)
pass 2 Example::Blue QVariant(int, 2) QVariant(int, 2)
pass 3 Example::Red QVariant(uint, 0) QVariant(int, 0)
pass 3 Example::Green QVariant(uint, 1) QVariant(int, 1)
pass 3 Example::Blue QVariant(uint, 2) QVariant(int, 2)
FAIL 4 Example::Red QVariant(qlonglong, 0) QVariant(int, 3)
FAIL 4 Example::Green QVariant(qlonglong, 1) QVariant(int, 3)
FAIL 4 Example::Blue QVariant(qlonglong, 2) QVariant(int, 3)
FAIL 5 Example::Red QVariant(qulonglong, 0) QVariant(int, 3)
FAIL 5 Example::Green QVariant(qulonglong, 1) QVariant(int, 3)
FAIL 5 Example::Blue QVariant(qulonglong, 2) QVariant(int, 3)
---
pass 2 Example::Red QVariant(int, 0) QVariant(int, 0)
pass 2 Example::Green QVariant(int, 1) QVariant(int, 1)
pass 2 Example::Blue QVariant(int, 2) QVariant(int, 2)
pass 3 Example::Red QVariant(uint, 0) QVariant(int, 0)
pass 3 Example::Green QVariant(uint, 1) QVariant(int, 1)
pass 3 Example::Blue QVariant(uint, 2) QVariant(int, 2)
FAIL 4 Example::Red QVariant(qlonglong, 0) QVariant(int, 3)
FAIL 4 Example::Green QVariant(qlonglong, 1) QVariant(int, 3)
FAIL 4 Example::Blue QVariant(qlonglong, 2) QVariant(int, 3)
FAIL 5 Example::Red QVariant(qulonglong, 0) QVariant(int, 3)
FAIL 5 Example::Green QVariant(qulonglong, 1) QVariant(int, 3)
FAIL 5 Example::Blue QVariant(qulonglong, 2) QVariant(int, 3)
---
pass 2 Example::Red QVariant(int, 0) Example::Red
pass 2 Example::Green QVariant(int, 1) Example::Green
pass 2 Example::Blue QVariant(int, 2) Example::Blue
pass 3 Example::Red QVariant(uint, 0) Example::Red
pass 3 Example::Green QVariant(uint, 1) Example::Green
pass 3 Example::Blue QVariant(uint, 2) Example::Blue
pass 4 Example::Red QVariant(qlonglong, 0) Example::Red
pass 4 Example::Green QVariant(qlonglong, 1) Example::Green
pass 4 Example::Blue QVariant(qlonglong, 2) Example::Blue
pass 5 Example::Red QVariant(qulonglong, 0) Example::Red
pass 5 Example::Green QVariant(qulonglong, 1) Example::Green
pass 5 Example::Blue QVariant(qulonglong, 2) Example::Blue

https://bugreports.qt.io/browse/QTBUG-108188