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88 lines
2.6 KiB
88 lines
2.6 KiB
3 weeks ago
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#pragma once
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#include <limits>
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#include <vector>
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#include <new>
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#include <utility>
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#include <memory>
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#include <utils/no_unique_address_emulation.hpp>
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namespace detail
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{
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template <std::size_t _Np, typename... _Types>
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struct __nth__ {
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};
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template <typename _Tp0, typename... _Rest>
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struct __nth__<0, _Tp0, _Rest...> {
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using type = _Tp0;
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};
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template <typename _Tp0, typename _Tp1, typename... _Rest>
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struct __nth__<1, _Tp0, _Tp1, _Rest...> {
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using type = _Tp1;
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};
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template <typename _Tp0, typename _Tp1, typename _Tp2, typename... _Rest>
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struct __nth__<2, _Tp0, _Tp1, _Tp2, _Rest...> {
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using type = _Tp2;
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};
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template <const std::size_t _Np, typename _Tp0, typename _Tp1, typename _Tp2, typename... _Rest>
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struct __nth__<_Np, _Tp0, _Tp1, _Tp2, _Rest...> : __nth__<_Np - 3, _Rest...> {
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};
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template <const std::size_t _Idx, typename... _Types>
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using _Select_nth_type = typename __nth__<_Idx, _Types...>::type;
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template <unsigned long long _Val, typename... _Ints>
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struct _Select_int_base;
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template <unsigned long long _Val, typename _IntType, typename... _Ints>
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struct _Select_int_base<_Val, _IntType, _Ints...> : std::conditional_t<(_Val <= std::numeric_limits<_IntType>::max()),
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std::integral_constant<_IntType, (_IntType)_Val>,
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_Select_int_base<_Val, _Ints...>> {
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};
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template <unsigned long long _Val>
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struct _Select_int_base<_Val> {
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};
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template <unsigned long long _Val>
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using _Select_int =
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typename _Select_int_base<_Val, unsigned char, unsigned short, unsigned int, unsigned long, unsigned long long>::type::
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value_type;
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} // namespace detail
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namespace impl::variadic
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{
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#pragma packed(push, 1)
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template <typename _Index_type>
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struct _Index_base {
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_Index_type __this_;
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_Index_type __next_;
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constexpr _Index_base(const _Index_type __i, const _Index_type __j) noexcept : __this_{__i}, __next_{__j} {}
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};
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#pragma packed(pop)
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template <typename _Ty, typename _Index_type>
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struct _Element : public _Index_base<_Index_type>,
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public no_unique_address_emulation<_Ty> {
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template <typename... _Args>
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explicit constexpr _Element(const std::size_t __i, _Args &&...__ctors) //
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noexcept(std::is_nothrow_constructible_v<_Ty, _Args...>)
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: _Index_base<_Index_type>{static_cast<_Index_type>(__i), std::numeric_limits<_Index_type>::max()},
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no_unique_address_emulation<_Ty>(std::forward<_Args>(__ctors)...)
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{
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}
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};
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template <typename _Allocator, typename... _Types>
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struct variadic {
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};
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} // namespace impl::variadic
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