extend_interfaces.h

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* (c) Copyright 1998-2025 CERN for the benefit of the LHCb and ATLAS collaborations *
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* This software is distributed under the terms of the Apache version 2 licence,     *
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#pragma once
 
template <typename... Interfaces>
struct extend_interfaces;
 
#include <GaudiKernel/IInterface.h>
 
// -----------------------------------------------------------------------------
// Interface extension classes
// -----------------------------------------------------------------------------
template <typename... Interfaces>
struct GAUDI_API extend_interfaces : virtual public Interfaces... {
  using ext_iids = typename Gaudi::interface_list_cat<typename Interfaces::ext_iids...>::type;
 
private:
  // hide interfaceID from the interfaces we inherit from to avoid that it leaks in concrete implementations
  static inline const InterfaceID& interfaceID() { return IInterface::interfaceID(); }
};
 
template <typename I1>
using extend_interfaces1 = extend_interfaces<I1>;
template <typename I1, typename I2>
using extend_interfaces2 = extend_interfaces<I1, I2>;
template <typename I1, typename I2, typename I3>
using extend_interfaces3 = extend_interfaces<I1, I2, I3>;
template <typename I1, typename I2, typename I3, typename I4>
using extend_interfaces4 = extend_interfaces<I1, I2, I3, I4>;