net.cpp

template<class T, class F>
class Kernel {
  public:
  virtual void exec()=0;
};

template<class T>
class PartialKernel: public Kernel<T, int> {
  public:
  void exec() {}
};

template<class T>
class StupidKernel: public PartialKernel<int> {
  public:
  void exec() {
    auto i = 0;    
  }
};

int main() {
  StupidKernel<int> ker;
  ker.exec();
}