Create an enumerator in QML by C++

Question

I’m trying to use an enumerator that was created in C++ and I’m using the QT 5.6 website itself to orient myself, Data Type Conversion Between QML and C++. But when compiling I get the following exception from the compiler:

error: Undefined Reference to `Typesexclass::staticMetaObject'

Enum

#include <QObject>
class TypeSexClass : public QObject
{
    Q_OBJECT
    Q_ENUMS(TypeSex)
public:
    enum TypeSex{
        NONE, MEN, WOMAN};
    TypeSex typesex() const;
};

Main

#include <QGuiApplication>
#include <QDebug>
#include <QtQml>

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

    TypeSexClass typesexclass();

    qmlRegisterUncreatableType<TypeSexClass>("teste.typesex", 1, 0, "TypeSexClass","It`s not do create");

    QQmlApplicationEngine engine;

    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();
}

The solved

Enum

#ifndef TYPESEX_H
#define TYPESEX_H

#include <QObject>

class TypeSexClass : public QObject
{
    Q_OBJECT
public:    
    enum TypeSex{
        NONE, MAN, WOMAN};
    Q_ENUM(TypeSex)
};

#endif // TYPESEX_H

Main

#include <QGuiApplication>
#include <QDebug>
#include <QtQml>
#include "typesex.h"

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

    qmlRegisterUncreatableType<TypeSexClass>("teste.typesex", 1, 0, "TypeSex","It's not instantiable. It's a enumeration");

    QQmlApplicationEngine engine;

    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();
}

QML

Window {
    id: window1
    title: "Redi"
    visible: true
    visibility : "Maximized"
    Button {
            id: button1
            x: 457
            width: 100
            height: 50
            text: qsTr("Gerar")
            anchors.top: parent.top
            anchors.topMargin: 33
            onClicked: {                
                console.log(TypeSex.MAN)
                console.log(TypeSex.WOMAN)
                console.log(TypeSex.NONE)
            }
}

Answer 1

Since Qt 5.5 you must use a new macro called Q_ENUM immediately after the definition of the enumeration. In your case:

enum TypeSex{NONE, MEN, WOMAN};
Q_ENUM(TypeSex)

Note that you no longer need to manually record in the meta class, just use the macro. Much easier! :)

More information in this post (in English).

P.S.: Silly preciousness, but use plural or singular in everything in your definition of enumeration. Men is in the plural, and Woman in the singular (use Men and Women, or Man and Woman - which seems to be the most suitable for the enumeration you are making).