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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_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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