#include <cstdlib>
#include <iostream>

using namespace std;

template <typename T>
class Vector {
public:
 Vector();
 ~Vector();
public:
 const T operator[](size_t sub) const { return data[sub]; }
 T& operator[](size_t sub) { return data[sub]; }
 void push_back(T obj);
 size_t size() const { return data_size; }
private:
 T   *data;
 size_t data_size;
 size_t block_size;
};

template <typename T>
Vector<T>::Vector(): data(0), data_size(0), block_size(0)
{}

template <typename T>
Vector<T>::~Vector()
{
 delete [] data;
}

template <typename T>
void Vector<T>::push_back(T obj)
{
 // Grow if necessary
 if (data_size == block_size) {
  block_size = (block_size == 0) ? 1 : block_size * 2;
  T *new_data = new T[block_size];
  for (size_t i = 0; i < data_size; i++)
   new_data[i] = data[i];
  delete [] data;
  data = new_data;
 }
 // Append
 data[data_size++] = obj;
}

int main()
{
 Vector<int> test;

 for (int i = 0; i < 10; i++)
  test.push_back(i);
 for (size_t i = 0; i < test.size(); i++)
  cout<< test[i] <<' ';
 cout<<endl;
 for (size_t i = 0; i < test.size(); i++)
  ++test[i];
 for (size_t i = 0; i < test.size(); i++)
  cout<< test[i] <<' ';
 cout<<endl;
}