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/*
* This file is part of OpenTTD.
* OpenTTD 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, version 2.
* OpenTTD 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 should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file ottd_optional.h Header to select between native. */
#ifndef OTTD_OPTIONAL_H
#define OTTD_OPTIONAL_H
#if defined(__has_include)
# if __has_include(<version>)
# include <version>
# endif
#endif
#if (__cplusplus >= 201703L) || (defined(__cpp_lib_optional) && __cpp_lib_optional >= 201606L)
/* Native std::optional. */
#include <optional>
namespace opt = std;
#else
/* No std::optional, use local copy instead. */
#include "optional.hpp"
namespace opt = std::experimental;
#endif
#endif /* OTTD_OPTIONAL_H */
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