template_specjalization_question.cpp

namespace N
{
    template< class T >
    foo( T& t );
    class Base
    {
        int x;
        int y;
    };

    class A : Base
    {
        int restA;
    };

    class B : Base
    {
        int restB;
    };

}

template< class T >
N::foo( T& t )
{
  do_sth_with_t( t );
  if( ?? A )
    do_sth_with_t_member( t.x );
  else if ( ?? B )
    do_sth_with_t_member( t.y );
}