TopBase.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
/*
 * Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration.
 */
 
 
#ifndef ATHENAKERNEL_TOPBASE_H
#define ATHENAKERNEL_TOPBASE_H
 
 
#include "AthenaKernel/BaseInfo.h"
#include "AthenaKernel/tools/safe_clid.h"
#include <type_traits>
 
 
namespace SG {
 

template <class T>
struct TopBase
{
  using Base1 = typename SG::Bases<T>::bases::Base1;
  static const bool has_base = !std::is_same<Base1, SG::NoBase>::value;
  static const bool base_has_clid = SG::safe_clid<Base1>();
  using type = typename std::conditional<has_base && base_has_clid,
                                         typename TopBase<Base1>::type,
                                         T>::type;
};
 
 
template <>
struct TopBase<SG::NoBase>
{
  using type = SG::NoBase;
};
 
 
} // namespace SG
 
 
#endif // not ATHENAKERNEL_TOPBASE_H