1 files changed, 39 insertions, 0 deletions
diff --git a/include/yacppdic/detail/internal/tuple_indices.hpp b/include/yacppdic/detail/internal/tuple_indices.hpp
new file mode 100644
index 0000000..3a367b6
--- /dev/null
+++ b/include/yacppdic/detail/internal/tuple_indices.hpp
@@ -0,0 +1,39 @@
+#pragma once
+
+#include <cstddef>
+
+namespace yacppdic::internal
+{
+
+template <std::size_t...>
+class TupleIndices
+{
+};
+
+template <typename IdxType, IdxType... Values>
+class IntegerSequence
+{
+public:
+	template <
+		template <typename OIdxType, OIdxType...>
+		typename ToIndexSeq,
+		typename ToIndexType>
+	using Convert = ToIndexSeq<ToIndexType, Values...>;
+
+	template <std::size_t Sp>
+	using ToTupleIndices = TupleIndices<(Values + Sp)...>;
+};
+
+template <std::size_t SizeOne, std::size_t SizeTwo>
+using MakeIndices =
+	typename __make_integer_seq<IntegerSequence, std::size_t, SizeOne - SizeTwo>::
+		template ToTupleIndices<SizeTwo>;
+
+template <std::size_t SizeOne, std::size_t SizeTwo = 0>
+requires(SizeTwo <= SizeOne) class MakeTupleIndices
+{
+public:
+	using type = MakeIndices<SizeOne, SizeTwo>;
+};
+
+} // namespace yacppdic::internal