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/*

 * Created: 05-02-2016

 * Modified: Fri 05 Feb 2016 11:26:13 CET

 * Author: Jonas R. Glesaaen (jonas@glesaaen.com)

 */

#include<iostream>

template <typename Type>

class Counter

{

public:

  Counter()

  {

    ++instances;

  }

  ~Counter()

  {

    --instances;

  }

  static unsigned instances;

};

class A : public Counter<A> {};

class B : public Counter<B> {};

template <typename Type>

unsigned Counter<Type>::instances = 0;

int main(int, char**)

{

  A a1, a2, a3, a4;

  B b1, b2;

  std::cout << Counter<B>::instances << std::endl;

}