#include <iostream>
#include <string>
using namespace std;

// defines Pair as a template with two 
// template parameters
template < class Key, class Data > 
class Pair
{
  public:
   
   // default constructor
   Pair( );

   // destructor
   ~Pair( );

   // copy constructor
   Pair( const Pair<Key, Data>& pair);

   // equality operator
   bool operator== (const Pair<Key, Data>& rhs) const;

  private:
   Key  m_key;
   Data m_data;
  
};

// Pair's equality operator
template <class K, class D>
bool Pair<K, D>::operator== (const Pair<K,D>& rhs) const
{
   return m_key == rhs.m_key && m_data == rhs.m_data;
}


int main ( )
{
   string bob = "bob";
   string mary = "mary";

   // use pair to associate a string and its length
   Pair< int, string > boy (bob.length(), bob);
   Pair< int, string > girl (mary.length(), mary);

   // make a new pair using copy constructor
   Pair<int, string> dad = boy;

   // check for equality
   if (bob == girl)
      cout << "They match\n";

   // use Pair for names and Employee object
   Employee john, mark;

   Pair< string, Employee> boss ("john", john);
   Pair< string, Employee> worker( "mark", mark);

   if (boss == worker)
      cout << "A real small company\n";

   return 0;
}