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C  , polymorphism vs. templatization of a function argument
template <typename T>
class A {T a;};

template <typename T>
class B: public A <T> {T b;};

template <typename Item>
struct TItems {typedef std::vector <Item> Type;};

template <typename Item>
class ModCont
{
    private:
            typename TItems <Item>::Type items;
};

template <typename T>
void test ( ModCont <A <T> > *it) {}

int main(int argc, char* argv[])
{

  ModCont < A <double> > a_items;
  ModCont < B <double> > b_items;
  test (&a_items); //Works
  test (&b_items); //Does not work
  return 0;
}

template <typename Object>
void test ( ModCont <Object> *it) {}