1 files changed, 26 insertions, 0 deletions
diff --git a/third_party/llvm-project/include/llvm/ADT/None.h b/third_party/llvm-project/include/llvm/ADT/None.h
new file mode 100644
index 000000000..004ca0ac5
--- /dev/null
+++ b/third_party/llvm-project/include/llvm/ADT/None.h
@@ -0,0 +1,26 @@
+//===-- None.h - Simple null value for implicit construction ------*- C++ -*-=//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file provides None, an enumerator for use in implicit constructors
+//  of various (usually templated) types to make such construction more
+//  terse.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ADT_NONE_H
+#define LLVM_ADT_NONE_H
+
+namespace llvm {
+/// A simple null object to allow implicit construction of Optional<T>
+/// and similar types without having to spell out the specialization's name.
+// (constant value 1 in an attempt to workaround MSVC build issue... )
+enum class NoneType { None = 1 };
+const NoneType None = NoneType::None;
+}
+
+#endif