This is an old revision of the document!

<sxh c> #include <stdlib.h> #include <stdio.h>

class B {

  public:
      B(int b) : m_b(b) {}
      operator int()
      {
          return m_b;
      }

      int operator()()
      {
          return m_b*2;
      }

  private:
      int m_b;

};

class A {

  public:
      A(int i)
      {
          printf("Output is: %d\n", i);
      }

};

int main() {

  int k = 6;
  A a( B(k) );

  // what is the output of this program?

  return 0;

}

</sxh>