diff --git a/services/surfaceflinger/WpHash.h b/services/surfaceflinger/WpHash.h
new file mode 100644
index 0000000..86777b7
--- /dev/null
+++ b/services/surfaceflinger/WpHash.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#pragma once
+
+namespace android {
+
+struct WpHash {
+    size_t operator()(const wp<IBinder>& p) const { return std::hash<IBinder*>()(p.unsafe_get()); }
+};
+
+} // namespace android
\ No newline at end of file