增加tuple兼容层

include/nostd/utility.h

@@ -0,0 +1,77 @@
+// Copyright 2021 atframework
+// Created by owent on 2024-05-28
+
+#pragma once
+
+#include <config/atframe_utils_build_feature.h>
+#include <config/compile_optimize.h>
+
+#include <cstddef>
+#include <tuple>
+
+LIBATFRAME_UTILS_NAMESPACE_BEGIN
+namespace nostd {
+
+#if __cplusplus >= 201402L
+
+using ::std::index_sequence;
+using ::std::index_sequence_for;
+using ::std::integer_sequence;
+using ::std::make_index_sequence;
+using ::std::make_integer_sequence;
+
+#else
+
+// Stores a tuple of indices.  Used by tuple and pair, and by bind() to
+// extract the elements in a tuple.
+template <size_t... __Indexes>
+struct __index_tuple {
+  using __next = __index_tuple<__Indexes..., sizeof...(__Indexes)>;
+};
+
+// Builds an __index_tuple<0, 1, 2, ..., __Num-1>.
+template <size_t __Num>
+struct __build_index_tuple {
+  using __type = typename __build_index_tuple<__Num - 1>::__type::__next;
+};
+
+template <>
+struct __build_index_tuple<0> {
+  using __type = __index_tuple<>;
+};
+
+/// Class template integer_sequence
+template <typename TSize, TSize... Idx>
+struct integer_sequence {
+  using value_type = TSize;
+  static constexpr size_t size() noexcept { return sizeof...(Idx); }
+};
+
+template <typename TSize, TSize Num, typename ISeq = typename __build_index_tuple<Num>::__type>
+struct __make_integer_sequence;
+
+template <typename TSize, TSize Num, size_t... Idx>
+struct __make_integer_sequence<TSize, Num, __index_tuple<Idx...> > {
+  static_assert(Num >= 0, "Cannot make integer sequence of negative length");
+
+  using __type = integer_sequence<TSize, static_cast<TSize>(Idx)...>;
+};
+
+template <typename TSize, TSize Num>
+using make_integer_sequence = __make_integer_sequence<TSize, Num>::__type;
+
+template <size_t... Idx>
+using index_sequence = integer_sequence<size_t, Idx...>;
+
+/// Alias template make_index_sequence
+template <size_t Num>
+using make_index_sequence = make_integer_sequence<size_t, Num>;
+
+/// Alias template index_sequence_for
+template <typename... _Types>
+using index_sequence_for = make_index_sequence<sizeof...(_Types)>;
+
+#endif
+
+}  // namespace nostd
+LIBATFRAME_UTILS_NAMESPACE_END