From 75495a44dc228432ec7563b9ada0353ab80b4bd3 Mon Sep 17 00:00:00 2001
From: Andrei Litvin <andreilitvin@google.com>
Date: Fri, 16 Jul 2021 12:49:52 -0400
Subject: [PATCH] Fix BUILD: add src/lib/support/TypeTraits.h from main branch
 since cherrypicks depend on it

---
 src/lib/support/TypeTraits.h | 41 ++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 src/lib/support/TypeTraits.h

diff --git a/src/lib/support/TypeTraits.h b/src/lib/support/TypeTraits.h
new file mode 100644
index 00000000000000..4eb344b2ce9fc7
--- /dev/null
+++ b/src/lib/support/TypeTraits.h
@@ -0,0 +1,41 @@
+/*
+ *
+ *    Copyright (c) 2021 Project CHIP Authors
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+/**
+ *    @file
+ *      This file defines and implements a number of miscellaneous
+ *      templates for simplify code with handling types.
+ *
+ */
+
+#pragma once
+
+#include <type_traits>
+
+namespace chip {
+
+/**
+ * @brief Implemented std::to_underlying introduced in C++23.
+ */
+template <class T>
+constexpr std::underlying_type_t<T> to_underlying(T e)
+{
+    static_assert(std::is_enum<T>::value, "to_underlying called to non-enum values.");
+    return static_cast<std::underlying_type_t<T>>(e);
+}
+
+} // namespace chip