// ourvec.h

#include <iostream>

using namespace std;

template <typename T>
  class vector
{
protected:
  T * data;
  int size, num;

  void enlarge()
  { int newsize = size * 2;
    if (newsize == 0)
      newsize = 1;
    T * news = new T [newsize];
    for (int i = 0; i < num; i += 1)
      news[i] = data[i];
    delete [] data;
    data = news;
    size = newsize; }

public:
  vector(int initsize = 0)
  { size = initsize;
    num = 0;
    data = new T[size]; }

  ~vector()
  { delete [] data; }

  T & get(int i)
  { if (i < 0 || i >= num)
    { cout << "index out of bounds\n";
      abort(); }
    return data[i]; }

  int get_num()
  { return num; }

  void push_back(T s)
  { if (num >= size)
      enlarge();
    data[num] = s;
    num += 1; }

  void copy_from(vector<T> &v)
  { delete [] data;
    size = 0;
    num = 0;
    data = new T[size];
    int i;
    for(i=0;i<v.get_num();i++)
       push_back(v.get(i)); }
 
};