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sol2/include/sol/traits.hpp
ThePhD ee13a7812f
Full fixes for everything.
2019-03-09 20:57:49 -05:00

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// sol3
// The MIT License (MIT)
// Copyright (c) 2013-2018 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 "string_view.hpp"
#include <type_traits>
#include <cstdint>
#include <memory>
#include <functional>
#include <array>
#include <iterator>
#include <iosfwd>
namespace sol {
namespace detail {
struct unchecked_t {};
const unchecked_t unchecked = unchecked_t{};
} // namespace detail
namespace meta {
using sfinae_yes_t = std::true_type;
using sfinae_no_t = std::false_type;
template <typename T>
using void_t = void;
namespace meta_detail {
template <template <class...> class Test, class, class... Args>
struct is_detected : std::false_type {};
template <template <class...> class Test, class... Args>
struct is_detected<Test, void_t<Test<Args...>>, Args...> : std::true_type {};
} // namespace detail
template <template <class...> class Trait, class... Args>
using is_detected = typename meta_detail::is_detected<Trait, void, Args...>::type;
template <template <class...> class Trait, class... Args>
constexpr inline bool is_detected_v = is_detected<Trait, Args...>::value;
template <std::size_t I>
using index_value = std::integral_constant<std::size_t, I>;
template <bool>
struct conditional {
template <typename T, typename U>
using type = T;
};
template <>
struct conditional<false> {
template <typename T, typename U>
using type = U;
};
template <bool B, typename T, typename U>
using conditional_t = typename conditional<B>::template type<T, U>;
namespace meta_detail {
template <typename T, template <typename...> class Templ>
struct is_specialization_of : std::false_type {};
template <typename... T, template <typename...> class Templ>
struct is_specialization_of<Templ<T...>, Templ> : std::true_type {};
} // namespace meta_detail
template <typename T, template <typename...> class Templ>
using is_specialization_of = meta_detail::is_specialization_of<std::remove_cv_t<T>, Templ>;
template <typename T, template <typename...> class Templ>
inline constexpr bool is_specialization_of_v = is_specialization_of<std::remove_cv_t<T>, Templ>::value;
template <typename T>
struct identity {
typedef T type;
};
template <typename T>
using identity_t = typename identity<T>::type;
template <typename T>
using is_tuple = is_specialization_of<T, std::tuple>;
template <typename T>
constexpr inline bool is_tuple_v = is_tuple<T>::value;
template <typename T>
using is_builtin_type = std::integral_constant<bool, std::is_arithmetic<T>::value || std::is_pointer<T>::value || std::is_array<T>::value>;
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 Condition, typename Then, typename Else>
using condition = conditional_t<Condition::value, Then, Else>;
template <typename... Args>
struct all : boolean<true> {};
template <typename T, typename... Args>
struct all<T, Args...> : condition<T, all<Args...>, boolean<false>> {};
template <typename... Args>
struct any : boolean<false> {};
template <typename T, typename... Args>
struct any<T, Args...> : condition<T, 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 <std::size_t Limit, std::size_t I, template <typename...> class Pred, typename... Ts>
struct count_for_pack : std::integral_constant<std::size_t, 0> {};
template <std::size_t Limit, std::size_t I, template <typename...> class Pred, typename T, typename... Ts>
struct count_for_pack<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_for_pack<Limit - 1, I + static_cast<std::size_t>(Pred<T>::value), Pred, Ts...>> {};
template <std::size_t I, template <typename...> class Pred, typename... Ts>
struct count_2_for_pack : std::integral_constant<std::size_t, 0> {};
template <std::size_t I, template <typename...> class Pred, typename T, typename U, typename... Ts>
struct count_2_for_pack<I, Pred, T, U, Ts...>
: conditional_t<sizeof...(Ts) == 0, std::integral_constant<std::size_t, I + static_cast<std::size_t>(Pred<T>::value)>,
count_2_for_pack<I + static_cast<std::size_t>(Pred<T>::value), Pred, Ts...>> {};
} // namespace meta_detail
template <template <typename...> class Pred, typename... Ts>
struct count_for_pack : meta_detail::count_for_pack<sizeof...(Ts), 0, Pred, Ts...> {};
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_for_pack<Limit, 0, Pred, Ts...> {};
template <template <typename...> class Pred, typename... Ts>
struct count_2_for_pack : meta_detail::count_2_for_pack<0, Pred, Ts...> {};
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 = std::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>
using is_c_str = any<std::is_same<std::decay_t<unqualified_t<T>>, const char*>, std::is_same<std::decay_t<unqualified_t<T>>, char*>,
std::is_same<unqualified_t<T>, std::string>>;
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, meta::disable<meta::is_specialization_of<meta::unqualified_t<T>, std::tuple>> = meta::enabler>
decltype(auto) force_tuple(T&& x) {
return std::tuple<std::decay_t<T>>(std::forward<T>(x));
}
template <typename T, meta::enable<meta::is_specialization_of<meta::unqualified_t<T>, std::tuple>> = meta::enabler>
decltype(auto) force_tuple(T&& x) {
return 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 detail {
template <typename T>
struct is_pointer_like : std::is_pointer<T> {};
template <typename T, typename D>
struct is_pointer_like<std::unique_ptr<T, D>> : std::true_type {};
template <typename T>
struct is_pointer_like<std::shared_ptr<T>> : std::true_type {};
template <typename T>
auto unwrap(T&& item) -> decltype(std::forward<T>(item)) {
return std::forward<T>(item);
}
template <typename T>
T& unwrap(std::reference_wrapper<T> arg) {
return arg.get();
}
template <typename T, meta::enable<meta::neg<is_pointer_like<meta::unqualified_t<T>>>> = meta::enabler>
auto deref(T&& item) -> decltype(std::forward<T>(item)) {
return std::forward<T>(item);
}
template <typename T, meta::enable<is_pointer_like<meta::unqualified_t<T>>> = meta::enabler>
inline auto deref(T&& item) -> decltype(*std::forward<T>(item)) {
return *std::forward<T>(item);
}
template <typename T, meta::disable<is_pointer_like<meta::unqualified_t<T>>, meta::neg<std::is_pointer<meta::unqualified_t<T>>>> = meta::enabler>
auto deref_non_pointer(T&& item) -> decltype(std::forward<T>(item)) {
return std::forward<T>(item);
}
template <typename T, meta::enable<is_pointer_like<meta::unqualified_t<T>>, meta::neg<std::is_pointer<meta::unqualified_t<T>>>> = meta::enabler>
inline auto deref_non_pointer(T&& item) -> decltype(*std::forward<T>(item)) {
return *std::forward<T>(item);
}
template <typename T>
inline T* ptr(T& val) {
return std::addressof(val);
}
template <typename T>
inline T* ptr(std::reference_wrapper<T> val) {
return std::addressof(val.get());
}
template <typename T>
inline T* ptr(T* val) {
return val;
}
} // namespace detail
} // namespace sol
#endif // SOL_TRAITS_HPP
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