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34 lines
1.1 KiB
C++
34 lines
1.1 KiB
C++
/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file ottd_optional.h Header to select between native. */
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#ifndef OTTD_OPTIONAL_H
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#define OTTD_OPTIONAL_H
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#if defined(__has_include)
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# if __has_include(<version>)
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# include <version>
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# endif
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#endif
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#if (__cplusplus >= 201703L) || (defined(__cpp_lib_optional) && __cpp_lib_optional >= 201606L)
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/* Native std::optional. */
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#include <optional>
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namespace opt = std;
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#else
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/* No std::optional, use local copy instead. */
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#include "optional.hpp"
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namespace opt = std::experimental;
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#endif
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#endif /* OTTD_OPTIONAL_H */
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