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#ifndef QPROPERTYBINDING_P_H
#define QPROPERTYBINDING_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp.  This header
// file may change from version to version without notice, or even be removed.
//
// We mean it.
//

#include <QtCore/qglobal.h>
#include <QtCore/qshareddata.h>
#include <QtCore/qvarlengtharray.h>
#include <memory>
#include <vector>
#include <functional>

#include "qproperty_p.h"

QT_BEGIN_NAMESPACE

struct QPropertyBindingPrivate : public QSharedData
{
    QUntypedPropertyBinding::BindingEvaluationFunction evaluationFunction;

    QPropertyObserverPointer firstObserver;
    QVarLengthArray<QPropertyObserver, 4> dependencyObservers;

    void *propertyDataPtr = nullptr;

    QPropertyBindingSourceLocation location;
    QPropertyBindingError error;

    QMetaType metaType;

    bool dirty = false;
    bool updating = false;

    QPropertyBindingPrivate(const QMetaType &metaType, QUntypedPropertyBinding::BindingEvaluationFunction evaluationFunction,
                            const QPropertyBindingSourceLocation &location)
        : evaluationFunction(std::move(evaluationFunction))
        , location(location)
        , metaType(metaType)
    {}
    virtual ~QPropertyBindingPrivate();

    void unlinkAndDeref();

    void markDirtyAndNotifyObservers();
    bool evaluateIfDirtyAndReturnTrueIfValueChanged();

    static QPropertyBindingPrivate *get(const QUntypedPropertyBinding &binding)
    { return binding.d.data(); }
};

QT_END_NAMESPACE

#endif // QPROPERTYBINDING_P_H