--- /dev/null
+////////////////////////////////////////////////////////////////////////////
+//
+// Copyright 2017 Realm 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 REALM_OS_PARTIAL_SYNC_HPP
+#define REALM_OS_PARTIAL_SYNC_HPP
+
+#include <functional>
+#include <memory>
+#include <string>
+
+namespace realm {
+
+class Realm;
+class Results;
+
+namespace partial_sync {
+
+void register_query(std::shared_ptr<Realm>, const std::string &object_class,
+ const std::string &query,
+ std::function<void (Results, std::exception_ptr)>);
+
+} // namespace partial_sync
+} // namespace realm
+
+#endif // REALM_OS_PARTIAL_SYNC_HPP