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Andrzej Krzemienski
38 lines
1.4 KiB
C++
38 lines
1.4 KiB
C++
// Copyright (C) 2026 Andrzej Krzemieński.
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//
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// Use, modification, and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/optional for documentation.
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//
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// You are welcome to contact the author at:
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// akrzemi1@gmail.com
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//
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//
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// This header provides definitions required by any specialization of
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// optional<>.
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#ifndef BOOST_OPTIONAL_DETAIL_OPTIONAL_SELECT_IMPLEMENTATION_01FEB2026_HPP
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#define BOOST_OPTIONAL_DETAIL_OPTIONAL_SELECT_IMPLEMENTATION_01FEB2026_HPP
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#include <boost/config.hpp>
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#if !defined(BOOST_NO_CXX11_CONSTEXPR) && \
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!defined(BOOST_NO_CXX11_REF_QUALIFIERS) && \
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!defined(BOOST_NO_CXX11_TRAILING_RESULT_TYPES) && \
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!defined(BOOST_NO_CXX11_UNRESTRICTED_UNION) && \
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!defined(BOOST_NO_CXX11_NOEXCEPT) && \
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!defined(BOOST_NO_CXX11_DEFAULTED_MOVES) && \
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!defined(BOOST_OPTIONAL_CONFIG_DISABLE_UNION_OPTIONAL)
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# define BOOST_OPTIONAL_USES_UNION_IMPLEMENTATION
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#endif
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// In C++20 we have `std::construct_at()` which is a constexpr equivalent of
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// placement-new. We can then make more functions constexpr.
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// TBD: This additional constexpr-ication is left for the future.
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# define BOOST_OPTIONAL_CXX20_CONSTEXPR
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#endif //BOOST_OPTIONAL_DETAIL_OPTIONAL_SELECT_IMPLEMENTATION_01FEB2026_HPP
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