src_qml_qqmlengine.cpp

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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
class MySingleton : public QObject {
    Q_OBJECT
 
    // Register as default constructed singleton.
    QML_ELEMENT
    QML_SINGLETON
 
    static int typeId;
    // ...
};
 
/*
    MySingleton::typeId = qmlTypeId(...);
*/
 
void wrapper2() {
    // Retrieve as QObject*
    QQmlEngine engine;
    MySingleton* instance = engine.singletonInstance<MySingleton*>(MySingleton::typeId);
}
 
/*
    // Register with QJSValue callback
    int typeId = qmlRegisterSingletonType(...);
*/
 
void wrapper4(int typeId) {
    // Retrieve as QJSValue
    QQmlEngine engine;
    QJSValue instance = engine.singletonInstance<QJSValue>(typeId);
}
 
void wrapper5() {
    QQmlEngine engine;
    MySingleton *singleton = engine.singletonInstance<MySingleton *>("mymodule", "MySingleton");
}