Как исправить ошибку или написать лучше

#ifndef LISTPERSON
#define LISTPERSON
#include <string>
#include <vector>
#include <iostream>
#include <stdexcept>
 
struct ElementSpiska {
protected:
    std::string family_name;
    unsigned year;
    unsigned month;
    unsigned date;
public:
 
    ElementSpiska():family_name(""), year(0), month(0), date(0){};
 
 
    ElementSpiska(std::string _fn, unsigned _y, unsigned _m, unsigned _d):
        family_name(_fn), year(_y), month(_m), date(_d){};
 
    friend std::ostream& operator<<(std::ostream &out, const ElementSpiska &e) {
        out << "[FN: " << e.family_name << ", D: " << e.year << "." << e.month << "." << e.date << "]";
        return out;
    }
 
    friend std::istream& operator>>(std::istream &in, ElementSpiska &e) {
        in >> e.family_name >> e.year >> e.month >> e.date;
        return in;
    }
 
 
};
 
 
class Array {
protected:
    ElementSpiska *data;
    std::size_t size;
    static const size_t max_size;
public:
    Array(size_t n = 0, ElementSpiska e = ElementSpiska()) {
        data = new ElementSpiska[max_size];
        size = n;
        for(size_t i = 0; i < n; ++i)
            data[i] = e;
    }
 
    ~Array() {
        delete [] data;
    }
 
    ElementSpiska& operator[](int i) {
        if(i < 0 || i >= size) throw std::out_of_range("Index Error!");
        else return data[i];
    }
};
 
const size_t Array::max_size = 32;
 
class ListPerson : public Array  {
public:
//void addEntry(ElementSpisk)
    void addEntry(std::string family_name, unsigned date, unsigned month, unsigned year) {
        if(size < max_size) {
            ElementSpiska tmp(family_name, date, month, year);
            data[size] = tmp;
            size++;
        }
        else {
            throw std::out_of_range("Cant add!");
        }
    }
};
 
enum zodiac{vodoley=0, ryba, oven, telec, blizneci, rak, leo, deva, vesi, scorpion, strelec, kozerog};
 
struct Zodiac {
    std::string name;
    unsigned begin_month;
    unsigned begin_date;
    unsigned end_month;
    unsigned end_date;
};
 
Zodiac Z[] = {
    {"Vodoley", 1, 21, 2, 18},
    {"Ryba", 2, 19, 3, 20},
    {"Oven", 3, 21, 4, 20},
    {"Telec", 4, 21, 5, 20},
    {"Blizneci", 5, 21, 6, 21},
    {"Rak", 6, 22, 7, 22},
    {"Leo", 7, 23, 8, 23},
    {"Deva", 8, 24, 9, 23},
    {"Vesi", 9, 24, 10, 23},
    {"Scorpion", 10, 24, 11, 22},
    {"Strelec", 11, 23, 12, 21 },
    {"Kozerog", 12, 22, 1, 20},
};

#include "stdexcept"
#include "ListPerson.h"
#include <exception>
using namespace std;
 
int main()
{
    ElementSpiska e1{"Ivanov", 2012, 12, 1};
    cout << e1;
 
    Array a(10, e1);
 
    try{
    for(size_t i = 0; i < 11; ++i)
        cout << a[i] << endl;
    }
    catch(exception& e) {
        cout << "Error: " << e.what() << endl;
 
    }
 
    ListPerson l1, l2;
 
    l1.union(l2);
}

 ElementSpiska e1{"Ivanov", 2012, 12, 1};

 l1.union(l2);