// sol2 // The MIT License (MIT) // Copyright (c) 2013-2021 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 <sol/tuple.hpp> #include <sol/bind_traits.hpp> #include <sol/pointer_like.hpp> #include <sol/base_traits.hpp> #include <sol/string_view.hpp> #include <type_traits> #include <cstdint> #include <memory> #include <functional> #include <array> #include <iterator> #include <iosfwd> #if SOL_IS_ON(SOL_STD_VARIANT_I_) #include <variant> #endif // variant is weird on XCode, thanks XCode 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... Args> constexpr inline bool all_v = all<Args...>::value; template <typename... Args> constexpr inline bool any_v = any<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_invocable : std::is_function<std::remove_pointer_t<T>> { }; template <typename T> struct is_invocable<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_invocable<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_invocable<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_with_iterator_test { private: template <typename C> static sfinae_yes_t test(decltype(std::declval<C>().insert( std::declval<std::add_rvalue_reference_t<typename C::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_no_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::value_type>>()))*); template <typename C> static sfinae_no_t test(...); public: static constexpr bool value = !std::is_same_v<decltype(test<T>(0)), sfinae_no_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>; }; template <typename T, typename U, typename = void> class supports_op_less_test : public std::false_type { }; template <typename T, typename U> class supports_op_less_test<T, U, void_t<decltype(std::declval<T&>() < std::declval<U&>())>> : public std::integral_constant<bool, #if SOL_IS_ON(SOL_STD_VARIANT_I_) !is_specialization_of_v<unqualified_t<T>, std::variant> && !is_specialization_of_v<unqualified_t<U>, std::variant> #else true #endif > { }; template <typename T, typename U, typename = void> class supports_op_equal_test : public std::false_type { }; template <typename T, typename U> class supports_op_equal_test<T, U, void_t<decltype(std::declval<T&>() == std::declval<U&>())>> : public std::integral_constant<bool, #if SOL_IS_ON(SOL_STD_VARIANT_I_) !is_specialization_of_v<unqualified_t<T>, std::variant> && !is_specialization_of_v<unqualified_t<U>, std::variant> #else true #endif > { }; template <typename T, typename U, typename = void> class supports_op_less_equal_test : public std::false_type { }; template <typename T, typename U> class supports_op_less_equal_test<T, U, void_t<decltype(std::declval<T&>() <= std::declval<U&>())>> : public std::integral_constant<bool, #if SOL_IS_ON(SOL_STD_VARIANT_I_) !is_specialization_of_v<unqualified_t<T>, std::variant> && !is_specialization_of_v<unqualified_t<U>, std::variant> #else true #endif > { }; template <typename T, typename U, typename = void> class supports_op_left_shift_test : public std::false_type { }; template <typename T, typename U> class supports_op_left_shift_test<T, U, void_t<decltype(std::declval<T&>() << std::declval<U&>())>> : public std::true_type { }; template <typename T, typename = void> class supports_adl_to_string_test : public std::false_type { }; template <typename T> class supports_adl_to_string_test<T, void_t<decltype(to_string(std::declval<const T&>()))>> : public std::true_type { }; 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> class supports_op_less : public meta_detail::supports_op_less_test<T, U> { }; template <typename T, typename U = T> class supports_op_equal : public meta_detail::supports_op_equal_test<T, U> { }; template <typename T, typename U = T> class supports_op_less_equal : public meta_detail::supports_op_less_equal_test<T, U> { }; template <typename T, typename U = T> class supports_op_left_shift : public meta_detail::supports_op_left_shift_test<T, U> { }; template <typename T> class supports_adl_to_string : public meta_detail::supports_adl_to_string_test<T> { }; template <typename T> class supports_to_string_member : public meta::boolean<meta_detail::has_to_string_test<meta_detail::non_void_t<T>>::value> { }; template <typename T> using is_invocable = boolean<meta_detail::is_invocable<T>::value>; template <typename T> constexpr inline bool is_invocable_v = is_invocable<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_with_iterator = meta::boolean<meta_detail::has_insert_with_iterator_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, #if SOL_IS_ON(SOL_CHAR8_T_I_) char8_t, #endif 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 { }; template <typename CharT, typename CharTargetT, typename TraitsT> struct is_string_view_of<std::basic_string_view<CharT, TraitsT>, CharTargetT> : std::is_same<CharT, CharTargetT> { }; 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> || is_specialization_of_v<T, std::basic_string_view> || 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>> || is_string_view_of_v<T, CharT> || std::is_null_pointer_v<T>>; 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_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, typename Char> using is_c_str_or_string_of = any<is_c_str_of<T, Char>, is_string_of<T, Char>>; template <typename T, typename Char> constexpr inline bool is_c_str_or_string_of_v = is_c_str_or_string_of<T, Char>::value; template <typename T> using is_c_str_or_string = is_c_str_or_string_of<T, char>; template <typename T> constexpr inline bool is_c_str_or_string_v = is_c_str_or_string<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 sol::meta #endif // SOL_TRAITS_HPP