1 files changed, 48 insertions, 0 deletions
diff --git a/pw_result/public/pw_result/expected.h b/pw_result/public/pw_result/expected.h
new file mode 100644
index 000000000..adc258555
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+++ b/pw_result/public/pw_result/expected.h
@@ -0,0 +1,48 @@
+// Copyright 2023 The Pigweed 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
+//
+//     https://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.
+#pragma once
+
+#if __has_include(<version>)
+#include <version>
+#endif
+
+#if defined(__cpp_lib_expected) && __cpp_lib_expected >= 202202L
+// No polyfill for <expected>.
+
+#include <expected>
+
+namespace pw {
+
+using std::expected;
+using std::unexpect;
+using std::unexpect_t;
+using std::unexpected;
+
+}  // namespace pw
+
+#else
+// Provide polyfill for <expected>.
+
+#include "pw_result/internal/expected_impl.h"
+
+namespace pw {
+
+using internal::expected;
+using internal::unexpect;
+using internal::unexpect_t;
+using internal::unexpected;
+
+}  // namespace pw
+
+#endif  // defined(__cpp_lib_expected) && __cpp_lib_expected >= 202202L