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84 lines
2.7 KiB
C++
84 lines
2.7 KiB
C++
// sol3
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// The MIT License (MIT)
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// Copyright (c) 2013-2020 Rapptz, ThePhD and contributors
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef SOL_OPTIONAL_HPP
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#define SOL_OPTIONAL_HPP
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#include <sol/forward.hpp>
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#include <sol/in_place.hpp>
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#include <sol/traits.hpp>
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#if SOL_IS_ON(SOL_USE_BOOST_I_)
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#include <boost/optional.hpp>
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#else
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#include <sol/optional_implementation.hpp>
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#endif // Boost vs. Better optional
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#include <optional>
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namespace sol {
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#if SOL_IS_ON(SOL_USE_BOOST_I_)
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template <typename T>
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using optional = boost::optional<T>;
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using nullopt_t = boost::none_t;
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SOL_BOOST_NONE_CONSTEXPR_I_ nullopt_t nullopt = boost::none;
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#endif // Boost vs. Better optional
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namespace meta {
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template <typename T>
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using is_optional = any<is_specialization_of<T, optional>, is_specialization_of<T, std::optional>>;
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template <typename T>
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constexpr inline bool is_optional_v = is_optional<T>::value;
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} // namespace meta
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namespace detail {
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template <typename T>
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struct associated_nullopt {
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inline static constexpr std::nullopt_t value = std::nullopt;
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};
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#if SOL_IS_ON(SOL_USE_BOOST_I_)
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template <typename T>
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struct associated_nullopt<boost::optional<T>> {
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inline static SOL_BOOST_NONE_CONSTEXPR_I_ boost::none_t value = boost::none;
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};
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#endif // Boost nullopt
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#if SOL_IS_ON(SOL_USE_BOOST_I_)
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template <typename T>
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inline SOL_BOOST_NONE_CONSTEXPR_I_ auto associated_nullopt_v = associated_nullopt<T>::value;
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#else
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template <typename T>
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inline constexpr auto associated_nullopt_v = associated_nullopt<T>::value;
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#endif // Boost continues to lag behind, to not many people's surprise...
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} // namespace detail
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} // namespace sol
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#if SOL_IS_ON(SOL_USE_BOOST_I_)
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#undef SOL_BOOST_NONE_CONSTEXPR_I_
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#endif
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#endif // SOL_OPTIONAL_HPP
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