CbmEnumArray.h

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/* Copyright (C) 2024 GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
   SPDX-License-Identifier: GPL-3.0-only
   Authors: Sergei Zharko [committer] */
 
 
#pragma once  // include this header only once per compilation unit
 
#include <boost/serialization/array.hpp>
#include <boost/serialization/base_object.hpp>
 
#include <array>
 
namespace cbm::core
{
  template<class E, class T>
  class EnumArray : public std::array<T, static_cast<std::size_t>(E::END)> {
    using U   = typename std::underlying_type<E>::type;  
    using Arr = std::array<T, static_cast<std::size_t>(E::END)>;
 
   public:
    T& operator[](const E& entry) { return Arr::operator[](static_cast<U>(entry)); }
 
    T& operator[](U index) { return Arr::operator[](index); }
 
    const T& operator[](const E& entry) const { return Arr::operator[](static_cast<U>(entry)); }
 
    const T& operator[](U index) const { return Arr::operator[](index); }
 
    operator Arr&() const { return *this; }
 
   private:
    friend class boost::serialization::access;
    template<typename Archive>
    void serialize(Archive& ar, const unsigned int /*version*/)
    {
      ar& boost::serialization::base_object<Arr>(*this);
    }
  };
}  // namespace cbm::core