protected inheritance with template classes

Question

I am having some trouble with inheritance between template classes. I started with a simple code that has a parent class and a child class that inherits that parent. The child class is able to access the protected data member of the parent class.

#include <iostream>
using namespace std;

# define LENGTH 10

class Parent {
protected:
    int * array[LENGTH] = {NULL};
};


class Child : public Parent {
public:
    void addItem(int * item) {
        for (int i = 0; i < LENGTH; i++) {
            if (array[i] == NULL) {
                array[i] = item;
            }
        }
    }
};

int main() {
    Child obj;
    int *temp = new int(5);
    obj.addItem(temp);
}

This compiles and runs just fine. But then I try to do the same thing with template classes.

#include <iostream>
using namespace std;

# define LENGTH 10
template <typename T>
class Parent {
protected:
    T * array[LENGTH] = {NULL};
};

template <typename T>
class Child : public Parent<T> {
public:
    void addItem(T * item) {
        for (int i = 0; i < LENGTH; i++) {
            if (array[i] == NULL) {
                array[i] = item;
            }
        }
    }
};

int main() {
    Child obj;
    int *temp = new int(5);
    obj.addItem(temp);
}

This second program does not compile, and I get an error that reads: 'array' was not declared in this scope. I don't know why template classes change the way inheritance works. Is there any way to use inheritance like this other than public get/set methods in the parent class?