vector_3

#include <iostream>
#include <vector>
using namespace std;

class obj {
public:
    static vector<obj*> vec;
    int data;
    obj(int data) : data(data) {
        vec.push_back(this);
        cout << "Added " << data << ".\n";
    }
    ~obj() {
        cout << "Deleted element\n";
    }
};

vector<obj*> obj::vec;

int main() {
    //объявляем 8 динамических объектов
    for(int i = 1; i <= 8; i++)
        obj *temp = new obj(i*i);
    cout << "Number of objects: " << obj::vec.size() << endl;
    //а теперь удаляем их
    while(!obj::vec.empty()) {
        delete obj::vec.back();
        obj::vec.pop_back();
    }
    cout << "Number of objects: " << obj::vec.size() << endl;
    return 0;
}