#include <memory>
#include <iostream>

class Mesh {
public:
  static const int a = 1;
};

class Light {
public:
  static const int a = 2;
};

class Object : public Mesh, public Light {
};

template <typename T>
std::shared_ptr<Object> createObject() {
  return std::static_pointer_cast<Object>(std::make_shared<T>());
}

int main() {
  auto ptr = createObject<Mesh>();
  std::cout << ptr->Mesh::a;

  auto btr = createObject<Light>();
  std::cout << btr->Light::a;
}