common.h - mozsearch

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// Copyright (C) 2026 Intel Corporation.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#ifndef TST_QSHAREDDATAPOINTER_COMMON_H

#define TST_QSHAREDDATAPOINTER_COMMON_H

#include <QTest>

#include <QtCore/QSharedData>

class Payload : public QSharedData

public:

    static inline int instanceCount = 0;

    int value = 0;

    Payload() { ++instanceCount; }

    explicit Payload(int v) : value(v) { ++instanceCount; }

    Payload(const Payload &other) : QSharedData(other), value(other.value) { ++instanceCount; }

    ~Payload() { --instanceCount; }

    void clear() { value = 0; }

};

// Access the payload through constData() throughout: on the implicit pointer

// operator->() would detach and defeat the sharing the test is exercising.

template <template <typename> class Ptr>

void clearPayloadTest()

    QCOMPARE(Payload::instanceCount, 0);

    // Unshared: the storage is reused and cleared in place.

        Ptr<Payload> p(new Payload(42));

        const Payload *before = p.constData();

        QCOMPARE(Payload::instanceCount, 1);

        p.clearPayload();

        QCOMPARE(p.constData(), before);

        QCOMPARE(p.constData()->value, 0);

        QCOMPARE(p.constData()->ref.loadRelaxed(), 1);

        QCOMPARE(Payload::instanceCount, 1);

    QCOMPARE(Payload::instanceCount, 0);

    // Shared: the other owner is left untouched and a fresh, singly-referenced

    // object is installed.

        Ptr<Payload> p(new Payload(42));

        Ptr<Payload> other(p);

        QCOMPARE(p.constData(), other.constData());

        QCOMPARE(p.constData()->ref.loadRelaxed(), 2);

        QCOMPARE(Payload::instanceCount, 1);

        p.clearPayload();

        QCOMPARE(other.constData()->value, 42);

        QCOMPARE(other.constData()->ref.loadRelaxed(), 1);

        QVERIFY(p.constData() != other.constData());

        QCOMPARE(p.constData()->value, 0);

        QCOMPARE(p.constData()->ref.loadRelaxed(), 1);

        QCOMPARE(Payload::instanceCount, 2);

            Ptr<Payload> copy(p);

            QCOMPARE(p.constData()->ref.loadRelaxed(), 2);

        QCOMPARE(p.constData()->ref.loadRelaxed(), 1);

        QCOMPARE(p.constData()->value, 0);

        QCOMPARE(Payload::instanceCount, 2);

    QCOMPARE(Payload::instanceCount, 0);

#endif // TST_QSHAREDDATAPOINTER_COMMON_H