[libcxx-commits] [libcxx] [libc++] Add MSVC's implementation of `exception_ptr` for Windows (PR #94977)

[via libcxx-commits]

================
@@ -0,0 +1,430 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// exception standard header
+
+// Copyright (c) Microsoft Corporation.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#ifndef _EXCEPTION_
+#define _EXCEPTION_
+#include <yvals.h>
+#if _STL_COMPILER_PREPROCESSOR
+
+#include <cstdlib>
+#include <type_traits>
----------------
mccakit wrote:

internal headers must be used, otherwise we get weird std::std double namespace stuff

#include <__type_traits/decay.h> is a good replacement

https://github.com/llvm/llvm-project/pull/94977