#include <iostream>

using namespace std;

template <typename T>
class Container
{
 protected:
T * storage;
size_t num_items;
size_t storage_size;
 public:
virtual void operator += (const T item) { }
virtual ~Container() { }
Container() : storage(nullptr), num_items(0), storage_size(0) { }
T & operator [] (size_t index)
 {
 if (index < num_items)
 return storage[index];
 }
size_t size() { return num_items; }
};

void main(int argc, char* argv[])
{
 Container<long> * store = new Box(); // Συμπληρώστε την αρχικοποίηση
 // αντικειμένου της δικής σας κλάσης
 *store+=10L;
 *store+=20L;
 *store+=30L;
 for (size_t i=0; i<store->size(); i++)
std::cout << (*store)[i] << " ";
 std::cout << std::endl;
 delete store;
}