1 files changed, 38 insertions, 0 deletions
diff --git a/contrib/llvm-project/libcxx/include/__utility/as_const.h b/contrib/llvm-project/libcxx/include/__utility/as_const.h
new file mode 100644
index 000000000000..2f23eb431efa
--- /dev/null
+++ b/contrib/llvm-project/libcxx/include/__utility/as_const.h
@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+// 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___UTILITY_AS_CONST_H
+#define _LIBCPP___UTILITY_AS_CONST_H
+
+#include <__config>
+#include <__utility/forward.h>
+#include <__utility/move.h>
+#include <type_traits>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER > 14
+template <class _Tp>
+_LIBCPP_NODISCARD_EXT constexpr add_const_t<_Tp>& as_const(_Tp& __t) noexcept { return __t; }
+
+template <class _Tp>
+void as_const(const _Tp&&) = delete;
+#endif
+
+_LIBCPP_END_NAMESPACE_STD
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP___UTILITY_AS_CONST_H