111 lines
2.7 KiB
C++
111 lines
2.7 KiB
C++
#pragma once
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#include <stdint.h>
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#include "../type/type.hpp"
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namespace util {
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template <typename T>
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inline constexpr type::remove_reference_t<T> &&move(T &&t) noexcept
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{
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return static_cast<type::remove_reference_t<T> &&>(t);
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}
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template <typename T>
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inline constexpr T &&forward(type::remove_reference_t<T> &t) noexcept
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{
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return static_cast<T &&>(t);
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}
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template <typename T>
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inline constexpr T &&forward(type::remove_reference_t<T> &&t) noexcept
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{
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static_assert(!type::is_lvalue_reference_v<T>, "Can not forward an rvalue as an lvalue.");
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return static_cast<T &&>(t);
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}
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template <typename T, T... Ints>
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struct integer_sequence {
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using __type = integer_sequence;
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using value_type = T;
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static constexpr size_t size() noexcept
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{
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return sizeof...(Ints);
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}
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};
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template <size_t... Ints>
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using index_sequence = integer_sequence<size_t, Ints...>;
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namespace detail {
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template <typename T, typename Seq1, typename Seq2>
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struct concat;
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template <typename T, T... Ints1, T... Ints2>
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struct concat<T, integer_sequence<T, Ints1...>, integer_sequence<T, Ints2...>>
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: integer_sequence<T, Ints1..., (sizeof...(Ints1) + Ints2)...> {
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};
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// uint64_t because this must be able to hold all possible sizes and cannot be T, because then the specialization for 0
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// and 1 are not possible
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template <typename T, uint64_t N>
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struct gen_integer_sequence : detail::concat<T, typename gen_integer_sequence<T, N / 2>::__type,
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typename gen_integer_sequence<T, N - N / 2>::__type> {
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};
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template <typename T>
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struct gen_integer_sequence<T, 0> : integer_sequence<T> {
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};
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template <typename T>
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struct gen_integer_sequence<T, 1> : integer_sequence<T, 0> {
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};
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} // namespace detail
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template <typename T, T N>
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struct make_integer_sequence : detail::gen_integer_sequence<T, N> {
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static_assert(N >= 0, "Integer sequence cannot be negative");
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};
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template <size_t N>
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using make_index_sequence = make_integer_sequence<size_t, N>;
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template <typename... T>
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using index_sequence_for = make_index_sequence<sizeof...(T)>;
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// Not part of <utility>, but very useful
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namespace detail {
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template <typename T, T Offset, T... Ints>
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inline constexpr integer_sequence<T, (Offset + Ints)...> add_offset(integer_sequence<T, Ints...>)
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{
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return {};
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}
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} // namespace detail
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template <typename T, T Offset, T N>
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inline constexpr auto make_offset_integer_sequence()
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{
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return detail::add_offset<T, Offset>(make_integer_sequence<T, N>{});
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}
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template <size_t Offset, size_t N>
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inline constexpr auto make_offset_index_sequence()
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{
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return make_offset_integer_sequence<size_t, Offset, N>();
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}
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template <class Fn, size_t... Ints>
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void for_constexpr(Fn &&func, index_sequence<Ints...>)
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{
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(func(type::integral_constant<size_t, Ints>{}), ...);
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}
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} // namespace util
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