How to create a dynamic array of pointers in the base class to derived class objects?

Question

C++ / C#

Good evening!

The essence of the task is this: Create a base class Array, declare an array field of the appropriate type and a variable that stores the size of the current array object in it. Implement the Person class as a derived class from the Array class, use public inheritance.

How can this be done? If I declare an array of the Person class in the Array class, I get errors:

Error C2065 list: undeclared identifier
Error C2061 syntax error: identifier 'Person'

#include <iostream>
#include "Class_Person.h"

class Class_Array
{	
  int count = 1;	
public:
  Class_Array()
  {
    for (std::size_t i = 0; i < count; i++)
      list[i] = 0;
  }
  ~Class_Array()
  {		
  }
private:
  Person** list = new Person * [count];//	
};

THE CODE

#pragma once
#include <iostream>
#include <string>
#include <vector>
#include "Class_Date.h"
#include "Class_Array.h"

class Person:public Class_Array
{	
   bool check_create = false;
   bool check_nam = true;
public:
  Person(Person**& list, int &count)
  {
    for (std::size_t i = 0; i < count; i++) 
      list[i] = 0;		
  }

  Person()
  {		
    name = "";
  }

  ~Person()
  {		
    cout << "Сработал деструктор" << endl;
    cout << "//===================================================" << endl;		
  }

  void set_name(string name)
  {
    this->name = name;
  }

  string get_name()
  {
    return name;
  }

  bool check_name(Person**& list,int &count, string check_name_,bool &check_nam)
  {
    for (int i = 0; i < count; i++)
    {
      if (check_name_ == list[i]->name)
      {
        cout << "Такая фамилия уже существует в списке!" << endl;
        return check_nam = true;
      }
      else
      {
        return check_nam = false;
      }
    }		
  }

  void choose_fun(Person**& list, int &count)
  {
    bool check = true;
    int choice = 0;
    while (check)
    {
      cout << "Выберите функцию:\n1.Создать список\n2.Заполнить\n3.Показать\n4.Добавить\n5.Удалить\n6.Выход" << endl;
      cin >> choice;
      switch (choice)
      {
      case 1:
        create(list,check_create, count);
        break;
      case 2:
        system("cls");
        fillin(list, count);
        break;
      case 3:
        system("cls");
        show(list, count);
        break;
      case 4:
        system("cls");
        add(list, count);
        break;
      case 5:
        system("cls");
        del(list,count);
        break;
      case 6:
        clear(list, count);
        cout << "Выход" << endl;
        check = false;
        break;
      default:
        cout << "Ошибка ввода!" << endl;
        break;
      }
    }
  }

  void fillin(Person**& list, int& count)
  {	
    cin.clear();
    if (check_create)
    {
      for (int i = count-1; i < count; i++)
      {
        if (i>0)
        {
          while (check_nam)
          {
            cout << "Введите фамилию: ";
            cin >> list[i]->name;
            check_name(list,count,name,check_nam);						
          }
          check_nam = true;
        }
        else
        {
          cout << "Введите фамилию: ";
          cin >> list[i]->name;
          cin.clear();
        }
          
        cout << "Введите дату: " << endl;
        list[i]->data.read();
      }
    }
    else
    {
      cout << "\n***Создайте сначала список!***\n" << endl;
    }
  }

  bool create(Person**&list,bool & check_create, int &count)
  {		
    for (int i = 0; i < count; i++)
    {
      list[i] = new Person;
    }
    cout << "Список создан! В списке " << count << " персона" << endl;
    return check_create = true;
  }
  
  int add(Person** &list, int &count)
  {	
    if (check_create)
    {
      Person** list_new = new Person * [count + 1];
      for (int i = 0; i < count; i++)
      {
        list_new[i] = list[i];
      }
      count++;
      list_new[count - 1] = new Person;
      fillin(list_new, count);
      delete[]list;
      list = list_new;
      cout << "Персона добавлена" << "(+" << count - 1 << ")" << endl;
      return count;
    }
    else
    {
      cout << "\n***Создайте сначала список!***\n" << endl;
    }
  }
  int del(Person**& list, int& count)
  {
    if (check_create)
    {
      int number;
      cout << "Выберите кого необходимо удалить!(Введите порядковый номер)" << endl;
      show(list, count);
      cin >> number;
      Person** list_new = new Person * [count - 1];
      for (int i = 0; i < count; i++)
      {
        if (number == 1)
        {
          list_new[i] = list[i+1];
        }
        else if (i == (number - 1))
        {
          list_new[i - 1] = list[i];
        }
      }
      count--;
      delete[]list;
      list = list_new;			
      return count;
    }
    else
    {
      cout << "\n***Создайте сначала список!***\n" << endl;
    }		
  }
  
  void show(Person**& list, int& count)
  {
    if (check_create)
    {
      for (int i = 0; i < count; i++)
      {
        cout << i + 1 << ". Фамилия - " << list[i]->name;
        list[i]->data.display();
        cout << endl;
      }
    }
    else
    {
      cout << "\n***Создайте сначала список!***\n" << endl;
    }
  }
  void clear(Person**& list, int &count)
  {
    for (int i = 0; i < count; i++)
    {
      delete[]list[i];
    }
  }

private:
  std::string name;
  Date data;		
};

Answer 1

You clearly misunderstood the problem. You do not need to solve the question in the title.
You need to write a vector class and its successor - Person.
Nobody asked to create a vector containing pointers to Person.
If this is the entire text of the task, I can offer you int as a "suitable type".