/****************************************************************************
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** Copyright (C) 2016 The Qt Company Ltd.
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** This file is part of the QtQml module of the Qt Toolkit.
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** Alternatively, this file may be used under the terms of the GNU
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#ifndef QQMLCOMPONENTATTACHED_P_H
#define QQMLCOMPONENTATTACHED_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtQml/qqml.h>
#include <private/qtqmlglobal_p.h>
#include <QtCore/QObject>

QT_BEGIN_NAMESPACE


// implemented in qqmlcomponent.cpp
class Q_QML_PRIVATE_EXPORT QQmlComponentAttached : public QObject
{
    Q_OBJECT

    // Used as attached object for QQmlComponent. We want qqmlcomponentattached_p.h to be #include'd
    // when registering QQmlComponent, but we cannot #include it from qqmlcomponent.h. Therefore we
    // force an anonymous type registration here.
    QML_ANONYMOUS
public:
    QQmlComponentAttached(QObject *parent = nullptr);
    ~QQmlComponentAttached();

    void add(QQmlComponentAttached **a) {
        prev = a; next = *a; *a = this;
        if (next) next->prev = &next;
    }
    void rem() {
        if (next) next->prev = prev;
        *prev = next;
        next = nullptr; prev = nullptr;
    }
    QQmlComponentAttached **prev;
    QQmlComponentAttached *next;

Q_SIGNALS:
    void completed();
    void destruction();

private:
    friend class QQmlContextData;
};

QT_END_NAMESPACE

#endif // QQMLCOMPONENTATTACHED_P_H
