Setting up parameter for function within Link List - c++

Question

I created at doubly link list and want to test out my count function within list class.
the count function is given with a pointer to an abitrary node and count how many nodes in the list.
the problem I have right now is to set up an variable/object that I can put it in count function parameter in main(). For example, the pointer can be pointing the middle node in the list. basically any random node that user might be pointing such as head->next-next or tail->prev->prev in the list.
#include "pch.h"
#include <iostream>
#include <vector>
#include <fstream>
#include <cmath>
#include <string>
using namespace std;
template <class T>
class node {
public:
T data;
node<T> *next;
node<T> *prev;
//node() {};
node(T newdata):data(newdata){ next = nullptr; prev = nullptr; }
};
template <class T>
class list {
node<T> *head;
node<T> *tail;
public:
list() { head = nullptr; tail = nullptr; }
void insert_head(int newval) {
node<T> *curr = new node<T>(newval);
if (head == nullptr) {
head = tail = curr;
return;
}
tail->next = curr;
curr->prev = tail;
tail = curr;
return;
}
void print() {
node<T>*curr = head;
while (curr != nullptr) {
cout << curr->data << endl;
curr = curr->next;
}
}
int count(node<T>* rannode) {
int count = 0;
node<T> *tohead = rannode;
node<T> *totail = rannode;
while (totail->next != nullptr) {
count++;
totail = totail->next;
}
while (tohead != nullptr) {
count++;
tohead = tohead->prev;
}
return count;
}
};
int main() {
list<int> test;
test.insert_head(1);
test.insert_head(2);
test.insert_head(3);
test.insert_head(4);
test.insert_head(5);
test.print();
test.count(??)
return 0;
}
``` ``` ``` ``` ``` ``` ``` ``` ``` ``` ``` ```