Использование умного указателя std::weak_ptr

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <iomanip>
#include <conio.h>
#include <fstream>
#include <string>
#include <ctime>
#include <memory>
 
using namespace std;
 
class date
{
protected:
    int day, month, year;
public:
    date()
    {
        day = 27;
        month = 1; 
        year = 1756;
    }
    date(int d, int m, int y)
    {
        if (d < 1 || d > 31)
            day = 27;
        else
            day = d;
        if (m < 1 || m > 12)
            month = 1;
        else
            month = m;
        if (y < 1500 || y > 2018)
            year = 1756;
        else
            year = y;
    }
    date(const date &dateObj)
    {
        *this = dateObj;
    }
    void show();
    void fshow();
};
 
class musCompos
{
protected:
    int symphony, sonata;
    char* concert;
    char* divertissement;
public:
    musCompos()
    {
        symphony = 39;
        sonata = 16;
        concert = new char[6];
        strcpy(concert, "Piano");
        divertissement = new char[8];
        strcpy(divertissement, "D major");
    }
    musCompos(int sym, int son, char* con, char* div)
    {
        symphony = sym;
        sonata = son;
        concert = new char[strlen(con) + 1];
        divertissement = new char[strlen(div) + 1];
        strcpy(concert, con);
        strcpy(divertissement, div);
    }
    musCompos(const musCompos &musObj)
    {
        *this = musObj;
    }
    void show();
    void fshow();
};
 
class person : public date
{
protected:
    char* surname;
public:
    char* name;
    //string name;
    person()
    {
        name = new char[17];
        strcpy(name, "Wolfgang Amadeus");
        //name = "Wolfgang Amadeus";
        surname = new char[7];
        strcpy(surname, "Mozart");
        date();
    }
    person(/*string nm,*/ char* nm, char* snm, int d, int m, int y) : date(d, m, y)
    {
        name = new char[strlen(nm) + 1];
        strcpy(name, nm);
        //name = nm;
        surname = new char[strlen(snm) + 1];
        strcpy(surname, snm);
        
    }
    person(const person &personObj)
    {
        *this = personObj;
    }
    void show();
    void fshow();
};
 
class compos : public person, public musCompos, public date
{
protected:
    char* description;
public:
    int minutes, seconds;
    compos()
    {
        description = new char[15];
        strcpy(description, "calm, relaxing");
        minutes = 3;
        seconds = 23;
        person();
        musCompos();
        date();
    }
    compos(char* des, int min, int sec, int d, int m, int y, person composytor, musCompos msc) : person(composytor), musCompos(msc), date(d, m, y)
    {
        description = new char[strlen(des) + 1];
        strcpy(description, des);
        minutes = min;
        seconds = sec;
    }
    compos(const compos &composObj) 
    { 
        *this = composObj; 
    };
    void getTime();
    void fgetTime();
    void show();
    void fshow();
};
 
class list : public compos
{
public:
    unsigned int len;
    compos *arr;
 
    list()
    {
        len = 5;                                        //65535;
        arr = new compos[len];
        person bet("Ludwig van", "Beethoven", 16, 12, 1770), bac("Johann Sebastian", "Bach", 21, 3, 1685), viv("Antonio", "Vivaldi", 4, 3, 1678), cha("Pyotr", "Chaikovsky", 7, 5, 1840);
        musCompos betc(9, 14, "Piano", "C major"), bacc(3, 8, "Organ", "B minor"), vivc(16, 3, "Violin", "F major"), chac(1, 3, "Piano", "D minor");
        arr[0] = compos();
        arr[1] = compos("exciting, anxious", 3, 135, 1, 1, 1801, bet, betc);
        arr[2] = compos("incredible, space", 47, 3, 24, 10, 1720, bac, bacc);
        arr[3] = compos("energetic, lively", 25, 64, 9, 5, 1700, viv, vivc);
        arr[4] = compos("interesting, intriguing", 60, 38, 5, 1, 1880, cha, chac);
    }
    list(int ln, compos cmp) : compos(cmp)
    {
        len = ln;
        arr = new compos[len];
    }
    ~list()
    {
        delete[]arr;
    }
    compos &operator[](int i)
    {
        if (i < 0 || i > 4)
        {
            cout << " Wrong index (i = " << i << ")" << endl;
            cout << " Program completion..." << endl;
            _getch();
            exit(0);
        }
        else arr[i].show();
    }
    template <typename T>
    void average(T *arr)
    {
        int sum = 0;
        int sums = 0;
        int avrg = 0;
        int avrgs = 0;
        for (int i = 0; i < len; i++)
        {
            sum += arr[i].minutes;
        }
        for (int i = 0; i < len; i++)
        {
            sums += arr[i].seconds;
        }
        sum += sums / 60;
        avrg = sum / len;
        sums = sums % 60;
        avrgs = sums / len;
        cout << " Average time of compositions duration: ";
        if (avrgs > 9)
            cout << avrg << ":" << avrgs << endl;
        else 
            cout << avrg << ":0" << avrgs << endl;
    }
    void sortName();
    void sortTime();
    void show();
    void fshow();
    void bshow();
};

int main()
{
    person person1;
 
    person person2(person1);
 
    std::cout <<  "Person2 name before:  " << person2.name << std::endl;
    
    strcpy(person1.name, "Andriano");
 
    std::cout <<  "Person2 name after:  " << person2.name << std::endl;
 
}

class person : public date