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diff --git a/lib/sol2/include/sol/in_place.hpp b/lib/sol2/include/sol/in_place.hpp
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+// sol3 
+
+// The MIT License (MIT)
+
+// Copyright (c) 2013-2019 Rapptz, ThePhD and contributors
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#ifndef SOL_IN_PLACE_HPP
+#define SOL_IN_PLACE_HPP
+
+#include <cstddef>
+#include <utility>
+
+namespace sol {
+
+#if defined(SOL_CXX17_FEATURES) && SOL_CXX17_FEATURES
+	using in_place_t = std::in_place_t;
+	constexpr std::in_place_t in_place{};
+	constexpr std::in_place_t in_place_of{};
+
+	template <typename T>
+	using in_place_type_t = std::in_place_type_t<T>;
+	template <typename T>
+	constexpr std::in_place_type_t<T> in_place_type{};
+
+	template <size_t I>
+	using in_place_index_t = std::in_place_index_t<I>;
+	template <size_t I>
+	constexpr in_place_index_t<I> in_place_index{};
+#else
+	namespace detail {
+		struct in_place_of_tag {};
+		template <std::size_t I>
+		struct in_place_of_i {};
+		template <typename T>
+		struct in_place_of_t {};
+	} // namespace detail
+
+	struct in_place_tag {
+		constexpr in_place_tag() = default;
+	};
+
+	constexpr inline in_place_tag in_place(detail::in_place_of_tag) {
+		return in_place_tag();
+	}
+	template <typename T>
+	constexpr inline in_place_tag in_place(detail::in_place_of_t<T>) {
+		return in_place_tag();
+	}
+	template <std::size_t I>
+	constexpr inline in_place_tag in_place(detail::in_place_of_i<I>) {
+		return in_place_tag();
+	}
+
+	constexpr inline in_place_tag in_place_of(detail::in_place_of_tag) {
+		return in_place_tag();
+	}
+	template <typename T>
+	constexpr inline in_place_tag in_place_type(detail::in_place_of_t<T>) {
+		return in_place_tag();
+	}
+	template <std::size_t I>
+	constexpr inline in_place_tag in_place_index(detail::in_place_of_i<I>) {
+		return in_place_tag();
+	}
+
+	using in_place_t = in_place_tag (&)(detail::in_place_of_tag);
+	template <typename T>
+	using in_place_type_t = in_place_tag (&)(detail::in_place_of_t<T>);
+	template <std::size_t I>
+	using in_place_index_t = in_place_tag (&)(detail::in_place_of_i<I>);
+#endif
+
+} // namespace sol
+
+#endif // SOL_IN_PLACE_HPP