1 files changed, 34 insertions, 0 deletions
diff --git a/pw_containers/public/pw_containers/iterator.h b/pw_containers/public/pw_containers/iterator.h
new file mode 100644
index 000000000..d9a8f7296
--- /dev/null
+++ b/pw_containers/public/pw_containers/iterator.h
@@ -0,0 +1,34 @@
+// Copyright 2022 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
+
+#include <iterator>
+
+#include "pw_polyfill/standard.h"
+
+namespace pw::containers {
+
+#if PW_CXX_STANDARD_IS_SUPPORTED(20)
+
+// If std::contiguous_iterator_tag exists, use it directly.
+using std::contiguous_iterator_tag;
+
+#else
+
+// If std::contiguous_iterator_tag does not exist, define a stand-in type.
+struct contiguous_iterator_tag : public std::random_access_iterator_tag {};
+
+#endif  // PW_CXX_STANDARD_IS_SUPPORTED(20)
+
+}  // namespace pw::containers