b2QueryCallback::ReportFixture ignores return value? about box2d HOT 6 CLOSED

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code sample:

const QList<Object*>& World::query(const QRectF& rect, bool multiSelect) {
    b2AABB aabb;
    aabb.upperBound = b2Vec2(rect.left(), rect.top());
    aabb.lowerBound = b2Vec2(rect.right(), rect.bottom());
    m_queriedObjects.clear();
    m_multiSelect = multiSelect;
    printf("query:");
    m_world.Query(this, aabb);
    printf("\n");
    return m_queriedObjects;
}

bool World::ReportFixture(b2Fixture* f) {
    printf("x");
    m_queriedObjects.append(static_cast<Object*>(f->GetBody()->GetUserData()));
    return false;
}

sample output:
query:xx

(should only be one x)

confirmed on box2d 2.1.0, rev10