151 lines
6.3 KiB
C++
151 lines
6.3 KiB
C++
#pragma once
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namespace asl {
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template<typename... Args> struct types {};
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struct empty {};
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template<typename T> struct id { using type = T; };
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template<typename T, T kValue> struct integral_constant { static constexpr T value = kValue; };
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template<bool B> using bool_constant = integral_constant<bool, B>;
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using true_type = bool_constant<true>;
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using false_type = bool_constant<false>;
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template<bool kSelect, typename U, typename V> struct _select_helper { using type = V; };
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template<typename U, typename V> struct _select_helper<true, U, V> { using type = U; };
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template<bool kSelect, typename U, typename V> using select_t = _select_helper<kSelect, U, V>::type;
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template<typename U, typename V> struct _is_same_helper : false_type {};
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template<typename T> struct _is_same_helper<T, T> : true_type {};
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template<typename U, typename V> concept is_same = _is_same_helper<U, V>::value && _is_same_helper<V, U>::value;
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template<typename T> auto _as_lref_helper(int) -> id<T&>;
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template<typename T> auto _as_lref_helper(...) -> id<T>;
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template<typename T> auto _as_rref_helper(int) -> id<T&&>;
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template<typename T> auto _as_rref_helper(...) -> id<T>;
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template<typename T> using as_lref_t = decltype(_as_lref_helper<T>(0))::type;
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template<typename T> using as_rref_t = decltype(_as_rref_helper<T>(0))::type;
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template<typename T> struct _un_ref_t { using type = T; };
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template<typename T> struct _un_ref_t<T&> { using type = T; };
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template<typename T> struct _un_ref_t<T&&> { using type = T; };
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template<typename T> using un_ref_t = _un_ref_t<T>::type;
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template<typename T, typename... Args> concept constructible = __is_constructible(T, Args...);
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template<typename T> concept default_constructible = constructible<T>;
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template<typename T> concept copy_constructible = constructible<T, as_lref_t<const T>>;
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template<typename T> concept move_constructible = constructible<T, as_rref_t<T>>;
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template<typename T, typename... Args> concept trivially_constructible = __is_trivially_constructible(T, Args...);
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template<typename T> concept trivially_default_constructible = trivially_constructible<T>;
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template<typename T> concept trivially_copy_constructible = trivially_constructible<T, as_lref_t<const T>>;
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template<typename T> concept trivially_move_constructible = trivially_constructible<T, as_rref_t<T>>;
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template<typename T, typename... Args> concept assignable = __is_assignable(T, Args...);
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template<typename T> concept copy_assignable = assignable<as_lref_t<T>, as_lref_t<const T>>;
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template<typename T> concept move_assignable = assignable<as_lref_t<T>, as_rref_t<T>>;
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template<typename T, typename... Args> concept trivially_assignable = __is_trivially_assignable(T, Args...);
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template<typename T> concept trivially_copy_assignable = trivially_assignable<as_lref_t<T>, as_lref_t<const T>>;
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template<typename T> concept trivially_move_assignable = trivially_assignable<as_lref_t<T>, as_rref_t<T>>;
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template<typename T> concept trivially_destructible = __is_trivially_destructible(T);
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using nullptr_t = decltype(nullptr);
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template<typename T> struct _un_const_helper { using type = T; };
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template<typename T> struct _un_const_helper<const T> { using type = T; };
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template<typename T> using un_const_t = _un_const_helper<T>::type;
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template<typename T> struct _un_volatile_helper { using type = T; };
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template<typename T> struct _un_volatile_helper<volatile T> { using type = T; };
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template<typename T> using un_volatile_t = _un_volatile_helper<T>::type;
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template<typename T> using un_cv_t = un_volatile_t<un_const_t<T>>;
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template<typename T> concept is_void = is_same<void, un_cv_t<T>>;
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template<typename T> struct _is_ref_helper { static constexpr bool l = false; static constexpr bool r = false; };
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template<typename T> struct _is_ref_helper<T&> { static constexpr bool l = true; static constexpr bool r = false; };
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template<typename T> struct _is_ref_helper<T&&> { static constexpr bool l = false; static constexpr bool r = true; };
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template<typename T> concept is_ref = _is_ref_helper<T>::l || _is_ref_helper<T>::r;
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template<typename T> struct _is_ptr_helper : false_type {};
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template<typename T> struct _is_ptr_helper<T*> : true_type {};
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template<typename T> concept is_ptr = _is_ptr_helper<un_cv_t<T>>::value;
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template<typename T> struct _tame_helper { using type = T; };
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#define TAME_HELPER_IMPL(TRAILING) \
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template<typename R, typename... Args> \
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struct _tame_helper<R(Args...) TRAILING> { using type = R(Args...); }
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TAME_HELPER_IMPL();
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TAME_HELPER_IMPL(&);
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TAME_HELPER_IMPL(&&);
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TAME_HELPER_IMPL(const);
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TAME_HELPER_IMPL(const &);
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TAME_HELPER_IMPL(const &&);
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TAME_HELPER_IMPL(volatile);
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TAME_HELPER_IMPL(volatile &);
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TAME_HELPER_IMPL(volatile &&);
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TAME_HELPER_IMPL(const volatile);
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TAME_HELPER_IMPL(const volatile &);
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TAME_HELPER_IMPL(const volatile &&);
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TAME_HELPER_IMPL(noexcept);
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TAME_HELPER_IMPL(& noexcept);
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TAME_HELPER_IMPL(&& noexcept);
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TAME_HELPER_IMPL(const noexcept);
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TAME_HELPER_IMPL(const & noexcept);
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TAME_HELPER_IMPL(const && noexcept);
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TAME_HELPER_IMPL(volatile noexcept);
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TAME_HELPER_IMPL(volatile & noexcept);
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TAME_HELPER_IMPL(volatile && noexcept);
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TAME_HELPER_IMPL(const volatile noexcept);
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TAME_HELPER_IMPL(const volatile & noexcept);
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TAME_HELPER_IMPL(const volatile && noexcept);
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#undef TAME_HELPER_IMPL
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template<typename T> using tame_t = _tame_helper<T>::type;
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template<typename T> struct _is_func_helper : false_type {};
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template<typename R, typename... Args> struct _is_func_helper<R(Args...)> : true_type {};
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template<typename T> concept is_func = _is_func_helper<tame_t<T>>::value;
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template<typename T> concept is_object = !is_void<T> && !is_ref<T> && !is_func<T>;
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template<typename T> struct _is_array_helper : false_type {};
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template<typename T> struct _is_array_helper<T[]> : true_type {};
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template<typename T, int N> struct _is_array_helper<T[N]> : true_type {};
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template<typename T> concept is_array = _is_array_helper<T>::value;
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template<typename T>
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auto _devoid_helper()
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{
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if constexpr (is_void<T>) return id<empty>{};
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else return id<T>{};
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}
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template<typename T> using devoid_t = decltype(_devoid_helper<T>())::type;
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} // namespace asl
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