generic linked list c++

linked_list.h

//
// Created by s353498 on 11/29/2019.
//

#ifndef E6_LINKED_LIST_H
#define E6_LINKED_LIST_H

#include "node.h"

template<class D>

class linked_list {
private:
    node<D>* head;
    int list_size{};
public:

    linked_list() {
        this->head = nullptr;
        this->list_size = 0;
    }

    node<D> *getHead() {
        return this->head;
    }

    int size() {
        return this->list_size;
    }

    void push(node<D> *node) {
        node->next = nullptr;
        node->prev = nullptr;

        if(this->head == nullptr){
            this->head = node;
        } else {
            this->head->prev = node;
            node->next = this->head;
            this->head = node;
        }
        this->list_size++;
    }

    node<D> *pop() {
        node<D>* temp = this->head;
        if(this->size() > 1) {
            this->head = this->head->next;
            this->head->prev = nullptr;
        }
        this->list_size--;
        return temp;
    }

    node<D> *get(int idx) {
        if(idx == 0){
            return this->head;
        } else if(idx >= this->list_size) {
            return nullptr;
        } else {
            node<D>* temp = this->head;
            int i = 0;
            while (i != idx){
                temp = temp->next;
                i++;
            }
            return temp;
        }
    }

    ~linked_list() {
        while (this->head){
            node<D>* temp = this->head->next;
            delete this->head;
            this->head = temp;
        }
        this->list_size = 0;
    }
};


#endif //E6_LINKED_LIST_H

main.cpp

#include <iostream>
#include "linked_list.h"
#include "student.h"

using namespace std;

int main() {
    linked_list<student> list;

    student s1 = {2170000, "Smith", "John"};

    list.push(new node<student>(s1));

    cout << "size: " << list.size() << endl;
    cout << "pop: " << list.pop()->getData().toString() << endl;
    return 0;
}

node.h

//
// Created by s353498 on 11/29/2019.
//

#ifndef E6_NODE_H
#define E6_NODE_H

using namespace std;

template<class D>
class node {
private:
    D data;
public:
    node* next;
    node* prev;
    explicit node(D data){
        this->data = data;
    };
    D getData(){
        return this->data;
    };
    ~node() = default;
};




#endif //E6_NODE_H

student.h

//
// Created by s353498 on 11/29/2019.
//

#ifndef E6_STUDENT_H
#define E6_STUDENT_H

#include <string>
#include <string>
#include <sstream>

using namespace std;

struct student {
    int matricular_number;
    string last_name;
    string first_name;
    string toString(){
        stringstream s;
        s << this->last_name << ", " << this->first_name << ", " << this->matricular_number;
        return s.str();
    }
};

#endif //E6_STUDENT_H