extend_interfaces.h

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#ifndef GAUDIKERNEL_EXTEND_INTERFACES_H
#define GAUDIKERNEL_EXTEND_INTERFACES_H

#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;
};

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>;

#endif