extends.h

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#ifndef GAUDIKERNEL_EXTENDS_H
#define GAUDIKERNEL_EXTENDS_H

#include "GaudiKernel/IInterface.h"

template <typename BASE, typename... Interfaces>
class GAUDI_API extends: public BASE, virtual public extend_interfaces<Interfaces...> {

public:
  using base_class = extends;
  using extend_interfaces_base = extend_interfaces<Interfaces...>;
  using BASE::BASE;

  void *i_cast(const InterfaceID &tid) const override {
    using iids = typename extend_interfaces_base::ext_iids;
    void *ptr = Gaudi::iid_cast(tid, iids{}, this);
    return ptr ? ptr : BASE::i_cast(tid);
  }

  StatusCode queryInterface(const InterfaceID &ti, void** pp) override {
    if (!pp) return StatusCode::FAILURE;
    using iids = typename extend_interfaces_base::ext_iids;
    *pp = Gaudi::iid_cast(ti,iids{},this);
    // if cast failed, try the base class
    if (!*pp) return BASE::queryInterface(ti,pp);
    this->addRef();
    return StatusCode::SUCCESS;
  }

  std::vector<std::string> getInterfaceNames() const override {
    using iids = typename extend_interfaces_base::ext_iids;
    auto vb = BASE::getInterfaceNames();
    auto vi = Gaudi::getInterfaceNames( iids{} );
    // start with base, and move the rest...
    vb.insert( vb.end(),
               std::make_move_iterator(vi.begin()),
               std::make_move_iterator(vi.end()) );
    return vb;
  }

  ~extends() override = default;
};

template <typename BASE, typename I1> using extends1 = extends<BASE,I1>;
template <typename BASE, typename I1,
                         typename I2> using extends2 = extends<BASE,I1,I2>;
template <typename BASE, typename I1,
                         typename I2,
                         typename I3> using extends3 = extends<BASE,I1,I2,I3>;
template <typename BASE, typename I1,
                         typename I2,
                         typename I3,
                         typename I4> using extends4 = extends<BASE,I1,I2,I3,I4>;

#endif /* GAUDIKERNEL_EXTENDS_H */