Predicate Class GreaterThan < T >

template <typename T>
class GreaterThan
{
  public:
    bool operator () (const T& t1, const T& t2) const ;
} ;

template <typename T>
int GreaterThan<T>::operator () (const T& t1, const T& t2) const
{
  return (t1 > t2);
}