1 files changed, 87 insertions, 0 deletions
diff --git a/pw_minimal_cpp_stdlib/public/pw_minimal_cpp_stdlib/internal/iterator.h b/pw_minimal_cpp_stdlib/public/pw_minimal_cpp_stdlib/internal/iterator.h
new file mode 100644
index 000000000..23704ccd0
--- /dev/null
+++ b/pw_minimal_cpp_stdlib/public/pw_minimal_cpp_stdlib/internal/iterator.h
@@ -0,0 +1,87 @@
+// Copyright 2020 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 <cstddef>
+
+#include "pw_polyfill/standard.h"
+#include "pw_polyfill/standard_library/namespace.h"
+
+_PW_POLYFILL_BEGIN_NAMESPACE_STD
+
+#define __cpp_lib_nonmember_container_access 201411L
+
+template <typename C>
+auto begin(C& container) -> decltype(container.begin()) {
+  return container.begin();
+}
+
+template <typename C>
+auto begin(const C& container) -> decltype(container.begin()) {
+  return container.begin();
+}
+
+template <typename C>
+constexpr auto data(C& container) -> decltype(container.data()) {
+  return container.data();
+}
+
+template <typename C>
+constexpr auto data(const C& container) -> decltype(container.data()) {
+  return container.data();
+}
+
+template <typename T, decltype(sizeof(0)) kSize>
+constexpr T* data(T (&array)[kSize]) noexcept {
+  return array;
+}
+
+template <typename C>
+auto end(C& container) -> decltype(container.end()) {
+  return container.end();
+}
+
+template <typename C>
+auto end(const C& container) -> decltype(container.end()) {
+  return container.end();
+}
+
+template <typename C>
+constexpr auto size(const C& container) -> decltype(container.size()) {
+  return container.size();
+}
+
+template <typename T, decltype(sizeof(0)) kSize>
+constexpr decltype(sizeof(0)) size(const T (&)[kSize]) noexcept {
+  return kSize;
+}
+
+// NOT IMPLEMENTED: iterator_traits does not work
+template <typename>
+struct iterator_traits {};
+
+struct input_iterator_tag {};
+struct output_iterator_tag {};
+struct forward_iterator_tag : public input_iterator_tag {};
+struct bidirectional_iterator_tag : public forward_iterator_tag {};
+struct random_access_iterator_tag : public bidirectional_iterator_tag {};
+#if PW_CXX_STANDARD_IS_SUPPORTED(20)
+struct contiguous_iterator_tag : public random_access_iterator_tag {};
+#endif  // PW_CXX_STANDARD_IS_SUPPORTED(20)
+
+// NOT IMPLEMENTED: Reverse iterators are not implemented.
+template <typename>
+struct reverse_iterator;
+
+_PW_POLYFILL_END_NAMESPACE_STD