From dc2493e7525bb7633f697ef10f72b72b46222249 Mon Sep 17 00:00:00 2001
From: Andy Belle-Isle <drumsetmonkey@gmail.com>
Date: Fri, 30 Aug 2019 00:45:36 -0400
Subject: Forget what I said, I just need to change git attributes to mark for
 vendor

---
 lib/sol2/include/sol/traits.hpp | 708 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 708 insertions(+)
 create mode 100644 lib/sol2/include/sol/traits.hpp

(limited to 'lib/sol2/include/sol/traits.hpp')

diff --git a/lib/sol2/include/sol/traits.hpp b/lib/sol2/include/sol/traits.hpp
new file mode 100644
index 0000000..b47fdc9
--- /dev/null
+++ b/lib/sol2/include/sol/traits.hpp
@@ -0,0 +1,708 @@
+// 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_TRAITS_HPP
+#define SOL_TRAITS_HPP
+
+#include "tuple.hpp"
+#include "bind_traits.hpp"
+#include "pointer_like.hpp"
+#include "base_traits.hpp"
+#include "string_view.hpp"
+
+#include <type_traits>
+#include <cstdint>
+#include <memory>
+#include <functional>
+#include <array>
+#include <iterator>
+#include <iosfwd>
+
+
+namespace sol {
+	namespace meta {
+		template <typename T>
+		struct unwrapped {
+			typedef T type;
+		};
+
+		template <typename T>
+		struct unwrapped<std::reference_wrapper<T>> {
+			typedef T type;
+		};
+
+		template <typename T>
+		using unwrapped_t = typename unwrapped<T>::type;
+
+		template <typename T>
+		struct unwrap_unqualified : unwrapped<unqualified_t<T>> {};
+
+		template <typename T>
+		using unwrap_unqualified_t = typename unwrap_unqualified<T>::type;
+
+		template <typename T>
+		struct remove_member_pointer;
+
+		template <typename R, typename T>
+		struct remove_member_pointer<R T::*> {
+			typedef R type;
+		};
+
+		template <typename R, typename T>
+		struct remove_member_pointer<R T::*const> {
+			typedef R type;
+		};
+
+		template <typename T>
+		using remove_member_pointer_t = remove_member_pointer<T>;
+
+		template <typename T, typename...>
+		struct all_same : std::true_type {};
+
+		template <typename T, typename U, typename... Args>
+		struct all_same<T, U, Args...> : std::integral_constant<bool, std::is_same<T, U>::value && all_same<T, Args...>::value> {};
+
+		template <typename T, typename...>
+		struct any_same : std::false_type {};
+
+		template <typename T, typename U, typename... Args>
+		struct any_same<T, U, Args...> : std::integral_constant<bool, std::is_same<T, U>::value || any_same<T, Args...>::value> {};
+
+		template <typename T, typename... Args>
+		constexpr inline bool any_same_v = any_same<T, Args...>::value;
+
+		template <bool B>
+		using boolean = std::integral_constant<bool, B>;
+
+		template <bool B>
+		constexpr inline bool boolean_v = boolean<B>::value;
+
+		template <typename T>
+		using neg = boolean<!T::value>;
+
+		template <typename T>
+		constexpr inline bool neg_v = neg<T>::value;
+
+		template <typename... Args>
+		struct all : boolean<true> {};
+
+		template <typename T, typename... Args>
+		struct all<T, Args...> : std::conditional_t<T::value, all<Args...>, boolean<false>> {};
+
+		template <typename... Args>
+		struct any : boolean<false> {};
+
+		template <typename T, typename... Args>
+		struct any<T, Args...> : std::conditional_t<T::value, boolean<true>, any<Args...>> {};
+
+		template <typename T, typename... Args>
+		constexpr inline bool all_v = all<T, Args...>::value;
+
+		template <typename T, typename... Args>
+		constexpr inline bool any_v = any<T, Args...>::value;
+
+		enum class enable_t { _ };
+
+		constexpr const auto enabler = enable_t::_;
+
+		template <bool value, typename T = void>
+		using disable_if_t = std::enable_if_t<!value, T>;
+
+		template <typename... Args>
+		using enable = std::enable_if_t<all<Args...>::value, enable_t>;
+
+		template <typename... Args>
+		using disable = std::enable_if_t<neg<all<Args...>>::value, enable_t>;
+
+		template <typename... Args>
+		using enable_any = std::enable_if_t<any<Args...>::value, enable_t>;
+
+		template <typename... Args>
+		using disable_any = std::enable_if_t<neg<any<Args...>>::value, enable_t>;
+
+		template <typename V, typename... Vs>
+		struct find_in_pack_v : boolean<false> {};
+
+		template <typename V, typename Vs1, typename... Vs>
+		struct find_in_pack_v<V, Vs1, Vs...> : any<boolean<(V::value == Vs1::value)>, find_in_pack_v<V, Vs...>> {};
+
+		namespace meta_detail {
+			template <std::size_t I, typename T, typename... Args>
+			struct index_in_pack : std::integral_constant<std::size_t, SIZE_MAX> {};
+
+			template <std::size_t I, typename T, typename T1, typename... Args>
+			struct index_in_pack<I, T, T1, Args...>
+			: conditional_t<std::is_same<T, T1>::value, std::integral_constant<std::ptrdiff_t, I>, index_in_pack<I + 1, T, Args...>> {};
+		} // namespace meta_detail
+
+		template <typename T, typename... Args>
+		struct index_in_pack : meta_detail::index_in_pack<0, T, Args...> {};
+
+		template <typename T, typename List>
+		struct index_in : meta_detail::index_in_pack<0, T, List> {};
+
+		template <typename T, typename... Args>
+		struct index_in<T, types<Args...>> : meta_detail::index_in_pack<0, T, Args...> {};
+
+		template <std::size_t I, typename... Args>
+		struct at_in_pack {};
+
+		template <std::size_t I, typename... Args>
+		using at_in_pack_t = typename at_in_pack<I, Args...>::type;
+
+		template <std::size_t I, typename Arg, typename... Args>
+		struct at_in_pack<I, Arg, Args...> : std::conditional<I == 0, Arg, at_in_pack_t<I - 1, Args...>> {};
+
+		template <typename Arg, typename... Args>
+		struct at_in_pack<0, Arg, Args...> {
+			typedef Arg type;
+		};
+
+		namespace meta_detail {
+			template <typename, typename TI>
+			using on_even = meta::boolean<(TI::value % 2) == 0>;
+
+			template <typename, typename TI>
+			using on_odd = meta::boolean<(TI::value % 2) == 1>;
+
+			template <typename, typename>
+			using on_always = std::true_type;
+
+			template <template <typename...> class When, std::size_t Limit, std::size_t I, template <typename...> class Pred, typename... Ts>
+			struct count_when_for_pack : std::integral_constant<std::size_t, 0> {};
+			template <template <typename...> class When, std::size_t Limit, std::size_t I, template <typename...> class Pred, typename T, typename... Ts>
+			struct count_when_for_pack<When, Limit, I, Pred, T, Ts...> : conditional_t<
+				sizeof...(Ts) == 0 || Limit < 2,
+					std::integral_constant<std::size_t, I + static_cast<std::size_t>(Limit != 0 && Pred<T>::value)>,
+			     	count_when_for_pack<When, Limit - static_cast<std::size_t>(When<T, std::integral_constant<std::size_t, I>>::value), I + static_cast<std::size_t>(When<T, std::integral_constant<std::size_t, I>>::value && Pred<T>::value), Pred, Ts...>
+			> {};
+		} // namespace meta_detail
+
+		template <template <typename...> class Pred, typename... Ts>
+		struct count_for_pack : meta_detail::count_when_for_pack<meta_detail::on_always, sizeof...(Ts), 0, Pred, Ts...> {};
+
+		template <template <typename...> class Pred, typename... Ts>
+		inline constexpr std::size_t count_for_pack_v = count_for_pack<Pred, Ts...>::value;
+
+		template <template <typename...> class Pred, typename List>
+		struct count_for;
+
+		template <template <typename...> class Pred, typename... Args>
+		struct count_for<Pred, types<Args...>> : count_for_pack<Pred, Args...> {};
+
+		template <std::size_t Limit, template <typename...> class Pred, typename... Ts>
+		struct count_for_to_pack : meta_detail::count_when_for_pack<meta_detail::on_always, Limit, 0, Pred, Ts...> {};
+
+		template <std::size_t Limit, template <typename...> class Pred, typename... Ts>
+		inline constexpr std::size_t count_for_to_pack_v = count_for_to_pack<Limit, Pred, Ts...>::value;
+
+		template <template <typename...> class When, std::size_t Limit, template <typename...> class Pred, typename... Ts>
+		struct count_when_for_to_pack : meta_detail::count_when_for_pack<When, Limit, 0, Pred, Ts...> {};
+
+		template <template <typename...> class When, std::size_t Limit, template <typename...> class Pred, typename... Ts>
+		inline constexpr std::size_t count_when_for_to_pack_v = count_when_for_to_pack<When, Limit, Pred, Ts...>::value;
+
+		template <template <typename...> class Pred, typename... Ts>
+		using count_even_for_pack = count_when_for_to_pack<meta_detail::on_even, sizeof...(Ts), Pred, Ts...>;
+
+		template <template <typename...> class Pred, typename... Ts>
+		inline constexpr std::size_t count_even_for_pack_v = count_even_for_pack<Pred, Ts...>::value;
+
+		template <template <typename...> class Pred, typename... Ts>
+		using count_odd_for_pack = count_when_for_to_pack<meta_detail::on_odd, sizeof...(Ts), Pred, Ts...>;
+
+		template <template <typename...> class Pred, typename... Ts>
+		inline constexpr std::size_t count_odd_for_pack_v = count_odd_for_pack<Pred, Ts...>::value;
+
+		template <typename... Args>
+		struct return_type {
+			typedef std::tuple<Args...> type;
+		};
+
+		template <typename T>
+		struct return_type<T> {
+			typedef T type;
+		};
+
+		template <>
+		struct return_type<> {
+			typedef void type;
+		};
+
+		template <typename... Args>
+		using return_type_t = typename return_type<Args...>::type;
+
+		namespace meta_detail {
+			template <typename>
+			struct always_true : std::true_type {};
+			struct is_invokable_tester {
+				template <typename Fun, typename... Args>
+				static always_true<decltype(std::declval<Fun>()(std::declval<Args>()...))> test(int);
+				template <typename...>
+				static std::false_type test(...);
+			};
+		} // namespace meta_detail
+
+		template <typename T>
+		struct is_invokable;
+		template <typename Fun, typename... Args>
+		struct is_invokable<Fun(Args...)> : decltype(meta_detail::is_invokable_tester::test<Fun, Args...>(0)) {};
+
+		namespace meta_detail {
+
+			template <typename T, typename = void>
+			struct is_callable : std::is_function<std::remove_pointer_t<T>> {};
+
+			template <typename T>
+			struct is_callable<T,
+			     std::enable_if_t<std::is_final<unqualified_t<T>>::value && std::is_class<unqualified_t<T>>::value
+			          && std::is_same<decltype(void(&T::operator())), void>::value>> {};
+
+			template <typename T>
+			struct is_callable<T,
+			     std::enable_if_t<!std::is_final<unqualified_t<T>>::value && std::is_class<unqualified_t<T>>::value
+			          && std::is_destructible<unqualified_t<T>>::value>> {
+				struct F {
+					void operator()() {};
+				};
+				struct Derived : T, F {};
+				template <typename U, U>
+				struct Check;
+
+				template <typename V>
+				static sfinae_no_t test(Check<void (F::*)(), &V::operator()>*);
+
+				template <typename>
+				static sfinae_yes_t test(...);
+
+				static constexpr bool value = std::is_same_v<decltype(test<Derived>(0)), sfinae_yes_t>;
+			};
+
+			template <typename T>
+			struct is_callable<T,
+			     std::enable_if_t<!std::is_final<unqualified_t<T>>::value && std::is_class<unqualified_t<T>>::value
+			          && !std::is_destructible<unqualified_t<T>>::value>> {
+				struct F {
+					void operator()() {};
+				};
+				struct Derived : T, F {
+					~Derived() = delete;
+				};
+				template <typename U, U>
+				struct Check;
+
+				template <typename V>
+				static sfinae_no_t test(Check<void (F::*)(), &V::operator()>*);
+
+				template <typename>
+				static sfinae_yes_t test(...);
+
+				static constexpr bool value = std::is_same_v<decltype(test<Derived>(0)), sfinae_yes_t>;
+			};
+
+			struct has_begin_end_impl {
+				template <typename T, typename U = unqualified_t<T>, typename B = decltype(std::declval<U&>().begin()),
+				     typename E = decltype(std::declval<U&>().end())>
+				static std::true_type test(int);
+
+				template <typename...>
+				static std::false_type test(...);
+			};
+
+			struct has_key_type_impl {
+				template <typename T, typename U = unqualified_t<T>, typename V = typename U::key_type>
+				static std::true_type test(int);
+
+				template <typename...>
+				static std::false_type test(...);
+			};
+
+			struct has_key_comp_impl {
+				template <typename T, typename V = decltype(std::declval<unqualified_t<T>>().key_comp())>
+				static std::true_type test(int);
+
+				template <typename...>
+				static std::false_type test(...);
+			};
+
+			struct has_load_factor_impl {
+				template <typename T, typename V = decltype(std::declval<unqualified_t<T>>().load_factor())>
+				static std::true_type test(int);
+
+				template <typename...>
+				static std::false_type test(...);
+			};
+
+			struct has_mapped_type_impl {
+				template <typename T, typename V = typename unqualified_t<T>::mapped_type>
+				static std::true_type test(int);
+
+				template <typename...>
+				static std::false_type test(...);
+			};
+
+			struct has_value_type_impl {
+				template <typename T, typename V = typename unqualified_t<T>::value_type>
+				static std::true_type test(int);
+
+				template <typename...>
+				static std::false_type test(...);
+			};
+
+			struct has_iterator_impl {
+				template <typename T, typename V = typename unqualified_t<T>::iterator>
+				static std::true_type test(int);
+
+				template <typename...>
+				static std::false_type test(...);
+			};
+
+			struct has_key_value_pair_impl {
+				template <typename T, typename U = unqualified_t<T>, typename V = typename U::value_type, typename F = decltype(std::declval<V&>().first),
+				     typename S = decltype(std::declval<V&>().second)>
+				static std::true_type test(int);
+
+				template <typename...>
+				static std::false_type test(...);
+			};
+
+			template <typename T>
+			struct has_push_back_test {
+			private:
+				template <typename C>
+				static sfinae_yes_t test(decltype(std::declval<C>().push_back(std::declval<std::add_rvalue_reference_t<typename C::value_type>>()))*);
+				template <typename C>
+				static sfinae_no_t test(...);
+
+			public:
+				static constexpr bool value = std::is_same_v<decltype(test<T>(0)), sfinae_yes_t>;
+			};
+
+			template <typename T>
+			struct has_insert_test {
+			private:
+				template <typename C>
+				static sfinae_yes_t test(decltype(std::declval<C>().insert(std::declval<std::add_rvalue_reference_t<typename C::const_iterator>>(),
+				     std::declval<std::add_rvalue_reference_t<typename C::value_type>>()))*);
+				template <typename C>
+				static sfinae_no_t test(...);
+
+			public:
+				static constexpr bool value = std::is_same_v<decltype(test<T>(0)), sfinae_yes_t>;
+			};
+
+			template <typename T>
+			struct has_insert_after_test {
+			private:
+				template <typename C>
+				static sfinae_yes_t test(decltype(std::declval<C>().insert_after(std::declval<std::add_rvalue_reference_t<typename C::const_iterator>>(),
+				     std::declval<std::add_rvalue_reference_t<typename C::value_type>>()))*);
+				template <typename C>
+				static sfinae_no_t test(...);
+
+			public:
+				static constexpr bool value = std::is_same_v<decltype(test<T>(0)), sfinae_yes_t>;
+			};
+
+			template <typename T>
+			struct has_size_test {
+			private:
+				template <typename C>
+				static sfinae_yes_t test(decltype(std::declval<C>().size())*);
+				template <typename C>
+				static sfinae_no_t test(...);
+
+			public:
+				static constexpr bool value = std::is_same_v<decltype(test<T>(0)), sfinae_yes_t>;
+			};
+
+			template <typename T>
+			struct has_max_size_test {
+			private:
+				template <typename C>
+				static sfinae_yes_t test(decltype(std::declval<C>().max_size())*);
+				template <typename C>
+				static sfinae_no_t test(...);
+
+			public:
+				static constexpr bool value = std::is_same_v<decltype(test<T>(0)), sfinae_yes_t>;
+			};
+
+			template <typename T>
+			struct has_to_string_test {
+			private:
+				template <typename C>
+				static sfinae_yes_t test(decltype(std::declval<C>().to_string())*);
+				template <typename C>
+				static sfinae_no_t test(...);
+
+			public:
+				static constexpr bool value = std::is_same_v<decltype(test<T>(0)), sfinae_yes_t>;
+			};
+
+#if defined(_MSC_VER) && _MSC_VER <= 1910
+			template <typename T, typename U, typename = decltype(std::declval<T&>() < std::declval<U&>())>
+			std::true_type supports_op_less_test(std::reference_wrapper<T>, std::reference_wrapper<U>);
+			std::false_type supports_op_less_test(...);
+			template <typename T, typename U, typename = decltype(std::declval<T&>() == std::declval<U&>())>
+			std::true_type supports_op_equal_test(std::reference_wrapper<T>, std::reference_wrapper<U>);
+			std::false_type supports_op_equal_test(...);
+			template <typename T, typename U, typename = decltype(std::declval<T&>() <= std::declval<U&>())>
+			std::true_type supports_op_less_equal_test(std::reference_wrapper<T>, std::reference_wrapper<U>);
+			std::false_type supports_op_less_equal_test(...);
+			template <typename T, typename OS, typename = decltype(std::declval<OS&>() << std::declval<T&>())>
+			std::true_type supports_ostream_op(std::reference_wrapper<T>, std::reference_wrapper<OS>);
+			std::false_type supports_ostream_op(...);
+			template <typename T, typename = decltype(to_string(std::declval<T&>()))>
+			std::true_type supports_adl_to_string(std::reference_wrapper<T>);
+			std::false_type supports_adl_to_string(...);
+#else
+			template <typename T, typename U, typename = decltype(std::declval<T&>() < std::declval<U&>())>
+			std::true_type supports_op_less_test(const T&, const U&);
+			std::false_type supports_op_less_test(...);
+			template <typename T, typename U, typename = decltype(std::declval<T&>() == std::declval<U&>())>
+			std::true_type supports_op_equal_test(const T&, const U&);
+			std::false_type supports_op_equal_test(...);
+			template <typename T, typename U, typename = decltype(std::declval<T&>() <= std::declval<U&>())>
+			std::true_type supports_op_less_equal_test(const T&, const U&);
+			std::false_type supports_op_less_equal_test(...);
+			template <typename T, typename OS, typename = decltype(std::declval<OS&>() << std::declval<T&>())>
+			std::true_type supports_ostream_op(const T&, const OS&);
+			std::false_type supports_ostream_op(...);
+			template <typename T, typename = decltype(to_string(std::declval<T&>()))>
+			std::true_type supports_adl_to_string(const T&);
+			std::false_type supports_adl_to_string(...);
+#endif
+
+			template <typename T, bool b>
+			struct is_matched_lookup_impl : std::false_type {};
+			template <typename T>
+			struct is_matched_lookup_impl<T, true> : std::is_same<typename T::key_type, typename T::value_type> {};
+
+			template <typename T>
+			using non_void_t = meta::conditional_t<std::is_void_v<T>, ::sol::detail::unchecked_t, T>;
+		} // namespace meta_detail
+
+		template <typename T, typename U = T>
+		using supports_op_less
+		     = decltype(meta_detail::supports_op_less_test(std::declval<meta_detail::non_void_t<T>&>(), std::declval<meta_detail::non_void_t<U>&>()));
+		template <typename T, typename U = T>
+		using supports_op_equal
+		     = decltype(meta_detail::supports_op_equal_test(std::declval<meta_detail::non_void_t<T>&>(), std::declval<meta_detail::non_void_t<U>&>()));
+		template <typename T, typename U = T>
+		using supports_op_less_equal
+		     = decltype(meta_detail::supports_op_less_equal_test(std::declval<meta_detail::non_void_t<T>&>(), std::declval<meta_detail::non_void_t<U>&>()));
+		template <typename T, typename U = std::ostream>
+		using supports_ostream_op
+		     = decltype(meta_detail::supports_ostream_op(std::declval<meta_detail::non_void_t<T>&>(), std::declval<meta_detail::non_void_t<U>&>()));
+		template <typename T>
+		using supports_adl_to_string = decltype(meta_detail::supports_adl_to_string(std::declval<meta_detail::non_void_t<T>&>()));
+
+		template <typename T>
+		using supports_to_string_member = meta::boolean<meta_detail::has_to_string_test<meta_detail::non_void_t<T>>::value>;
+
+		template <typename T>
+		using is_callable = boolean<meta_detail::is_callable<T>::value>;
+
+		template <typename T>
+		constexpr inline bool is_callable_v = is_callable<T>::value;
+
+		template <typename T>
+		struct has_begin_end : decltype(meta_detail::has_begin_end_impl::test<T>(0)) {};
+
+		template <typename T>
+		constexpr inline bool has_begin_end_v = has_begin_end<T>::value;
+
+		template <typename T>
+		struct has_key_value_pair : decltype(meta_detail::has_key_value_pair_impl::test<T>(0)) {};
+
+		template <typename T>
+		struct has_key_type : decltype(meta_detail::has_key_type_impl::test<T>(0)) {};
+
+		template <typename T>
+		struct has_key_comp : decltype(meta_detail::has_key_comp_impl::test<T>(0)) {};
+
+		template <typename T>
+		struct has_load_factor : decltype(meta_detail::has_load_factor_impl::test<T>(0)) {};
+
+		template <typename T>
+		struct has_mapped_type : decltype(meta_detail::has_mapped_type_impl::test<T>(0)) {};
+
+		template <typename T>
+		struct has_iterator : decltype(meta_detail::has_iterator_impl::test<T>(0)) {};
+
+		template <typename T>
+		struct has_value_type : decltype(meta_detail::has_value_type_impl::test<T>(0)) {};
+
+		template <typename T>
+		using has_push_back = meta::boolean<meta_detail::has_push_back_test<T>::value>;
+
+		template <typename T>
+		using has_max_size = meta::boolean<meta_detail::has_max_size_test<T>::value>;
+
+		template <typename T>
+		using has_insert = meta::boolean<meta_detail::has_insert_test<T>::value>;
+
+		template <typename T>
+		using has_insert_after = meta::boolean<meta_detail::has_insert_after_test<T>::value>;
+
+		template <typename T>
+		using has_size = meta::boolean<meta_detail::has_size_test<T>::value>;
+
+		template <typename T>
+		using is_associative = meta::all<has_key_type<T>, has_key_value_pair<T>, has_mapped_type<T>>;
+
+		template <typename T>
+		using is_lookup = meta::all<has_key_type<T>, has_value_type<T>>;
+
+		template <typename T>
+		using is_ordered = meta::all<has_key_comp<T>, meta::neg<has_load_factor<T>>>;
+
+		template <typename T>
+		using is_matched_lookup = meta_detail::is_matched_lookup_impl<T, is_lookup<T>::value>;
+
+		template <typename T>
+		using is_initializer_list = meta::is_specialization_of<T, std::initializer_list>;
+
+		template <typename T>
+		constexpr inline bool is_initializer_list_v = is_initializer_list<T>::value;
+
+		template <typename T, typename CharT = char>
+		using is_string_literal_array_of = boolean<std::is_array_v<T> && std::is_same_v<std::remove_all_extents_t<T>, CharT>>;
+
+		template <typename T, typename CharT = char>
+		constexpr inline bool is_string_literal_array_of_v = is_string_literal_array_of<T, CharT>::value;
+
+		template <typename T>
+		using is_string_literal_array = boolean<std::is_array_v<T> && any_same_v<std::remove_all_extents_t<T>, char, char16_t, char32_t, wchar_t>>;
+
+		template <typename T>
+		constexpr inline bool is_string_literal_array_v = is_string_literal_array<T>::value;
+
+		template <typename T, typename CharT>
+		struct is_string_of : std::false_type {};
+
+		template <typename CharT, typename CharTargetT, typename TraitsT, typename AllocT>
+		struct is_string_of<std::basic_string<CharT, TraitsT, AllocT>, CharTargetT> : std::is_same<CharT, CharTargetT> {};
+
+		template <typename T, typename CharT>
+		constexpr inline bool is_string_of_v = is_string_of<T, CharT>::value;
+
+		template <typename T, typename CharT>
+		struct is_string_view_of : std::false_type {};
+
+#if defined(SOL_CXX17_FEATURES) && SOL_CXX17_FEATURES
+		template <typename CharT, typename CharTargetT, typename TraitsT>
+		struct is_string_view_of<std::basic_string_view<CharT, TraitsT>, CharTargetT> : std::is_same<CharT, CharTargetT> {};
+#else
+		template <typename CharT, typename CharTargetT, typename TraitsT>
+		struct is_string_view_of<basic_string_view<CharT, TraitsT>, CharTargetT> : std::is_same<CharT, CharTargetT> {};
+#endif
+
+		template <typename T, typename CharT>
+		constexpr inline bool is_string_view_of_v = is_string_view_of<T, CharT>::value;
+
+		template <typename T>
+		using is_string_like = meta::boolean<is_specialization_of_v<T, std::basic_string>
+#if defined(SOL_CXX17_FEATURES) && SOL_CXX17_FEATURES
+		     || is_specialization_of_v<T, std::basic_string_view>
+#else
+		     || is_specialization_of_v<T, basic_string_view>
+#endif
+		     || is_string_literal_array_v<T>>;
+
+		template <typename T>
+		constexpr inline bool is_string_like_v = is_string_like<T>::value;
+
+		template <typename T, typename CharT = char>
+		using is_string_constructible = meta::boolean<
+		     is_string_literal_array_of_v<T,
+		          CharT> || std::is_same_v<T, const CharT*> || std::is_same_v<T, CharT> || is_string_of_v<T, CharT> || std::is_same_v<T, std::initializer_list<CharT>>
+#if defined(SOL_CXX17_FEATURES) && SOL_CXX17_FEATURES
+		     || is_string_view_of_v<T, CharT>
+#endif
+		     >;
+
+		template <typename T, typename CharT = char>
+		constexpr inline bool is_string_constructible_v = is_string_constructible<T, CharT>::value;
+
+		template <typename T>
+		using is_string_like_or_constructible = meta::boolean<is_string_like_v<T> || is_string_constructible_v<T>>;
+
+		template <typename T>
+		struct is_pair : std::false_type {};
+
+		template <typename T1, typename T2>
+		struct is_pair<std::pair<T1, T2>> : std::true_type {};
+
+		template <typename T, typename Char>
+		using is_c_str_of = any<std::is_same<T, const Char*>, std::is_same<T, Char const* const>, std::is_same<T, Char*>, is_string_of<T, Char>,
+		     is_string_literal_array_of<T, Char>>;
+
+		template <typename T, typename Char>
+		constexpr inline bool is_c_str_of_v = is_c_str_of<T, Char>::value;
+
+		template <typename T>
+		using is_c_str = is_c_str_of<T, char>;
+
+		template <typename T>
+		constexpr inline bool is_c_str_v = is_c_str<T>::value;
+
+		template <typename T>
+		struct is_move_only
+		: all<neg<std::is_reference<T>>, neg<std::is_copy_constructible<unqualified_t<T>>>, std::is_move_constructible<unqualified_t<T>>> {};
+
+		template <typename T>
+		using is_not_move_only = neg<is_move_only<T>>;
+
+		namespace meta_detail {
+			template <typename T>
+			decltype(auto) force_tuple(T&& x) {
+				if constexpr (meta::is_specialization_of_v<meta::unqualified_t<T>, std::tuple>) {
+					return std::forward<T>(x);
+				}
+				else {
+					return std::tuple<T>(std::forward<T>(x));
+				}
+			}
+		} // namespace meta_detail
+
+		template <typename... X>
+		decltype(auto) tuplefy(X&&... x) {
+			return std::tuple_cat(meta_detail::force_tuple(std::forward<X>(x))...);
+		}
+
+		template <typename T, typename = void>
+		struct iterator_tag {
+			using type = std::input_iterator_tag;
+		};
+
+		template <typename T>
+		struct iterator_tag<T, conditional_t<false, typename std::iterator_traits<T>::iterator_category, void>> {
+			using type = typename std::iterator_traits<T>::iterator_category;
+		};
+
+	} // namespace meta
+} // namespace sol
+
+#endif // SOL_TRAITS_HPP
-- 
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