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diff --git a/cpp/include/libaddressinput/address_input_helper.h b/cpp/include/libaddressinput/address_input_helper.h
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+++ b/cpp/include/libaddressinput/address_input_helper.h
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+// Copyright (C) 2014 Google Inc.
+//
+// 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.
+
+#ifndef I18N_ADDRESSINPUT_ADDRESS_INPUT_HELPER_H_
+#define I18N_ADDRESSINPUT_ADDRESS_INPUT_HELPER_H_
+
+#include <vector>
+
+#include <libaddressinput/util/basictypes.h>
+
+namespace i18n {
+namespace addressinput {
+
+class LookupKey;
+class Node;
+class PreloadSupplier;
+struct AddressData;
+
+class AddressInputHelper {
+ public:
+  // Creates an input helper that uses the supplier provided to get metadata to
+  // help a user complete or fix an address. Doesn't take ownership of
+  // |supplier|. Since latency is important for these kinds of tasks, we expect
+  // the supplier to have the data already.
+  AddressInputHelper(PreloadSupplier* supplier);
+
+  ~AddressInputHelper();
+
+  // Fill in missing components of an address as best as we can based on
+  // existing data. For example, for some countries only one postal code is
+  // valid; this would enter that one. For others, the postal code indicates
+  // what state should be selected. Existing data will never be overwritten.
+  //
+  // Note that the preload supplier must have had the rules for the country
+  // represented by this address loaded before this method is called - otherwise
+  // an assertion failure will result.
+  //
+  // The address should have the best language tag as returned from
+  // BuildComponents().
+  void FillAddress(AddressData* address) const;
+
+ private:
+  void CheckChildrenForPostCodeMatches(
+      const AddressData& address, const LookupKey& lookup_key,
+      const Node* parent, std::vector<Node>* hierarchy) const;
+
+  // We don't own the supplier_.
+  PreloadSupplier* const supplier_;
+
+  DISALLOW_COPY_AND_ASSIGN(AddressInputHelper);
+};
+
+}  // namespace addressinput
+}  // namespace i18n
+
+#endif  // I18N_ADDRESSINPUT_ADDRESS_INPUT_HELPER_H_