extends.h

Go to the documentation of this file.

/***********************************************************************************\
* (c) Copyright 1998-2025 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
*                                                                                   *
* In applying this licence, CERN does not waive the privileges and immunities       *
* granted to it by virtue of its status as an Intergovernmental Organization        *
* or submit itself to any jurisdiction.                                             *
\***********************************************************************************/
#pragma once
 
#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;
 
  using extend_interfaces_base::i_cast;

  void const* 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;
    *pp = i_cast( ti );
    // 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;
  }
};
 
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>;