1 files changed, 51 insertions, 0 deletions
diff --git a/libcxx/include/__tuple_dir/tuple_like.h b/libcxx/include/__tuple_dir/tuple_like.h
new file mode 100644
index 000000000000..dab395be616b
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+++ b/libcxx/include/__tuple_dir/tuple_like.h
@@ -0,0 +1,51 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___TUPLE_TUPLE_LIKE_H
+#define _LIBCPP___TUPLE_TUPLE_LIKE_H
+
+#include <__config>
+#include <__fwd/array.h>
+#include <__fwd/pair.h>
+#include <__fwd/subrange.h>
+#include <__fwd/tuple.h>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/remove_cvref.h>
+#include <cstddef>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER >= 20
+
+template <class _Tp>
+struct __tuple_like_impl : false_type {};
+
+template <class... _Tp>
+struct __tuple_like_impl<tuple<_Tp...> > : true_type {};
+
+template <class _T1, class _T2>
+struct __tuple_like_impl<pair<_T1, _T2> > : true_type {};
+
+template <class _Tp, size_t _Size>
+struct __tuple_like_impl<array<_Tp, _Size> > : true_type {};
+
+template <class _Ip, class _Sp, ranges::subrange_kind _Kp>
+struct __tuple_like_impl<ranges::subrange<_Ip, _Sp, _Kp> > : true_type {};
+
+template <class _Tp>
+concept __tuple_like = __tuple_like_impl<remove_cvref_t<_Tp>>::value;
+
+#endif // _LIBCPP_STD_VER >= 20
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___TUPLE_TUPLE_LIKE_H