JsonExtensions.h

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// SPDX-FileCopyrightText: Deutsches Elektronen-Synchrotron DESY, MSK, ChimeraTK Project <chimeratk-support@desy.de>
// SPDX-License-Identifier: LGPL-3.0-or-later
#pragma once
 
#include <nlohmann/json.hpp>
 
#include <optional>
 
namespace nlohmann {
 
  template<typename T>
  struct adl_serializer<std::optional<T>> {
    static void to_json(json& j, const std::optional<T>& opt) {
      if(opt.has_value()) {
        j = *opt;
      }
      else {
        j = nullptr;
      }
    }
 
    static void from_json(const json& j, std::optional<T>& opt) {
      if(j.is_null()) {
        opt = std::nullopt;
      }
      else {
        opt = j.get<T>();
      }
    }
  };
 
} // namespace nlohmann