tuple_serialize.hpp

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// Copyright (c) 2013-2018 Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
// Copyright (c) 2013-2018 Centre national de la recherche scientifique (CNRS)
// Copyright (c) 2018 Simons Foundation
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You may obtain a copy of the License at
//     https://www.gnu.org/licenses/gpl-3.0.txt
//
// Authors: Olivier Parcollet, Nils Wentzell

 
#pragma once
 
#include <tuple>
 
namespace boost::serialization {
 
  // Recursive helper that serializes the element at position `tuple_size - 1 - pos`.
  template <int pos> struct tuple_serialize_impl {
    template <typename Archive, typename T> void operator()(Archive &ar, T &t) {
      ar &std::get<std::tuple_size_v<T> - 1 - pos>(t);
      tuple_serialize_impl<pos - 1>()(ar, t);
    }
  };
 
  // Base case of tuple_serialize_impl — serializes the last element.
  template <> struct tuple_serialize_impl<0> {
    template <typename Archive, typename T> void operator()(Archive &ar, T &t) { ar &std::get<std::tuple_size_v<T> - 1>(t); }
  };

  template <typename Archive, typename... Ts> void serialize(Archive &ar, std::tuple<Ts...> &t, [[maybe_unused]] const unsigned int version) {
    tuple_serialize_impl<sizeof...(Ts) - 1>()(ar, t);
  }
 
} // namespace boost::serialization