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diff --git a/Firestore/core/src/firebase/firestore/auth/user.h b/Firestore/core/src/firebase/firestore/auth/user.h
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+/*
+ * Copyright 2018 Google
+ *
+ * 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 FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_AUTH_USER_H_
+#define FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_AUTH_USER_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+
+namespace firebase {
+namespace firestore {
+namespace auth {
+
+/**
+ * Simple wrapper around a nullable UID. Mostly exists to make code more
+ * readable and for compatibility with other clients where map keys cannot be
+ * null.
+ */
+class User {
+ public:
+  /** Construct an unauthenticated user. */
+  User();
+
+  /** Construct an authenticated user with the given UID. */
+  explicit User(const absl::string_view uid);
+
+  const std::string& uid() const {
+    return uid_;
+  }
+
+  // PORTING NOTE: Here use more clear naming is_authenticated() instead of
+  // is_unauthenticated().
+  bool is_authenticated() const {
+    return is_authenticated_;
+  }
+
+  /** Returns an unauthenticated instance. */
+  static const User& Unauthenticated();
+
+  User& operator=(const User& other) = default;
+
+  friend bool operator==(const User& lhs, const User& rhs);
+
+ private:
+  std::string uid_;
+  bool is_authenticated_;
+};
+
+inline bool operator==(const User& lhs, const User& rhs) {
+  return lhs.is_authenticated_ == rhs.is_authenticated_ &&
+         (!lhs.is_authenticated_ || lhs.uid_ == rhs.uid_);
+}
+
+inline bool operator!=(const User& lhs, const User& rhs) {
+  return !(lhs == rhs);
+}
+
+}  // namespace auth
+}  // namespace firestore
+}  // namespace firebase
+
+#endif  // FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_AUTH_USER_H_