C++ reach class/structure field - c++

Question

I'm challenging myself to create my own custom integer array by making a class and structure with some functions. When I run the program I don't get an error, but the data of the index isn't being set, and I don't understand why.
Array class file
#include "IntArray.hpp"
using namespace std;
struct IntArrayIndex {
public:
IntArrayIndex* next = NULL;
int data;
IntArrayIndex(int Data) {
this->data = Data;
}
IntArrayIndex() {
this->data = 0;
}
};
class IntArray {
public:
IntArrayIndex head = *(new IntArrayIndex());
int length;
IntArray() {
this->length = 1;
this->head = *(new IntArrayIndex());
}
int getIndex(int index) {
if (index >= length) {
throw invalid_argument("Index out of range. Returned -1");
}
IntArrayIndex current = head;
if (index > 0) {
current = *current.next;
getIndex(--index);
}
return current.data;
}
void setIndex(int index, int data) {
IntArrayIndex current = head;
if (index > 0) {
if (current.next == NULL) {
current.next = new IntArrayIndex();
length++;
}
current = *current.next;
setIndex(--index, data);
}
current.data = data;
}
};
Main file
#include <iostream>
#include "IntArray.cpp"
int main(int argc, const char * argv[]) {
IntArray* l = new IntArray();
l->setIndex(0, 1);
std::cout << l->getIndex(0);
}
OUTPUT:
0
Program ended with exit code: 0

Answer 1

Changing the pointers in setIndex ended up fixing the problem:
void setIndex(int index, int data) {
IntArrayIndex* current = &head;
if (index > 0) {
if (current->next == NULL) {
current->next = new IntArrayIndex();
length++;
}
current = current->next;
setIndex(--index, data);
}
current->data = data;
}