如何在C++中将链表的起始指针作为指针传递

struct ListNode {
    int val;
    ListNode* next;
    ListNode(int x) : val(x), next(nullptr) {}
};

ListNode* createLinkedList(vector<int>& nums) {
    ListNode* dummy = new ListNode(0);
    ListNode* curr = dummy;
    for (int num : nums) {
        curr->next = new ListNode(num);
        curr = curr->next;
    }
    return dummy->next;
}

void modifyLinkedList(ListNode** head) {
    // 对链表进行修改和操作
    // 示例：反转链表
    ListNode* prev = nullptr;
    ListNode* curr = *head;
    while (curr != nullptr) {
        ListNode* next = curr->next;
        curr->next = prev;
        prev = curr;
        curr = next;
    }
    *head = prev;
}

int main() {
    vector<int> nums = {1, 2, 3, 4, 5};
    ListNode* head = createLinkedList(nums);
    modifyLinkedList(&head);
    ListNode* curr = head;
    while (curr != nullptr) {
        cout << curr->val << " ";
        curr = curr->next;
    }
    return 0;
}