qt-everywhere-src-5.14.1/qtbase/src/testlib/qtestcorelist_p.h

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#ifndef QTESTCORELIST_P_H
#define QTESTCORELIST_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 <QtCore/qglobal.h>

QT_BEGIN_NAMESPACE


template <class T>
class QTestCoreList
{
    public:
        QTestCoreList();
        virtual ~QTestCoreList();

        void addToList(T **list);
        T *nextElement();
        T *previousElement();
    private:
        T *next;
        T *prev;
};

template <class T>
QTestCoreList<T>::QTestCoreList()
    : next(nullptr)
    , prev(nullptr)
{
}

template <class T>
QTestCoreList<T>::~QTestCoreList()
{
    if (prev) {
        prev->next = nullptr;
    }
    delete prev;

    if (next) {
        next->prev = nullptr;
    }
    delete next;
}

template <class T>
void QTestCoreList<T>::addToList(T **list)
{
    if (next)
        next->addToList(list);
    else {
        next = *list;
        if (next)
            next->prev = static_cast<T*>(this);
    }

    *list = static_cast<T*>(this);
}

template <class T>
T *QTestCoreList<T>::nextElement()
{
    return next;
}

template <class T>
T *QTestCoreList<T>::previousElement()
{
    return prev;
}

QT_END_NAMESPACE

#endif