如何重载下标运算符才能成为可交换的

class ExchangableArray {
private:
    int data[10];

public:
    int& operator[](int index) {
        return data[index];
    }

    void exchange(ExchangableArray& other) {
        for (int i = 0; i < 10; i++) {
            int temp = data[i];
            data[i] = other.data[i];
            other.data[i] = temp;
        }
    }
};

ExchangableArray arr1;
ExchangableArray arr2;

arr1[0] = 1;
arr1[1] = 2;
arr1[2] = 3;

arr2[0] = 4;
arr2[1] = 5;
arr2[2] = 6;

arr1.exchange(arr2);

// 输出交换后的结果
for (int i = 0; i < 3; i++) {
    cout << arr1[i] << " ";  // 输出：4 5 6
}
cout << endl;
for (int i = 0; i < 3; i++) {
    cout << arr2[i] << " ";  // 输出：1 2 3
}
cout << endl;