如何保存/序列化QVector<int>格式的QVariant

#include <QVector>
#include <QVariant>
#include <QDataStream>
#include <QFile>

void saveQVector(const QVector<int>& data, const QString& filename)
{
    QFile file(filename);
    if (file.open(QIODevice::WriteOnly))
    {
        QDataStream stream(&file);
        QVariant variant = QVariant::fromValue(data);
        stream << variant;
        file.close();
    }
}

QVector<int> loadQVector(const QString& filename)
{
    QVector<int> data;
    QFile file(filename);
    if (file.open(QIODevice::ReadOnly))
    {
        QDataStream stream(&file);
        QVariant variant;
        stream >> variant;
        data = variant.value<QVector<int>>();
        file.close();
    }
    return data;
}