optional.hpp

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// Copyright (c) 2019-2024 Simons Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0.txt
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Authors: Thomas Hahn, Olivier Parcollet, Nils Wentzell
 
#ifndef LIBH5_STL_OPTIONAL_HPP
#define LIBH5_STL_OPTIONAL_HPP
 
#include "../format.hpp"
#include "../group.hpp"
#include "./string.hpp"
 
#include <optional>
#include <string>
 
namespace h5 {
 
  template <typename T>
  struct hdf5_format_impl<std::optional<T>> {
    static std::string invoke() { return hdf5_format_impl<T>::invoke(); }
  };
 
  template <typename T>
  void h5_write(group g, std::string const &name, std::optional<T> const &opt) {
    if (opt) h5_write(g, name, *opt);
  }
 
  template <typename T>
  void h5_read(group g, std::string name, std::optional<T> &opt) {
    opt.reset();
    if (g.has_key(name)) opt.emplace(h5_read<T>(g, name));
  }
 
} // namespace h5
 
#endif // LIBH5_STL_OPTIONAL_HPP