From 2bf85721c49b3d19707040aa986111d010402394 Mon Sep 17 00:00:00 2001
From: Jaepil Jeong <zgdr7th@gmail.com>
Date: Mon, 11 Dec 2023 05:42:10 -0800
Subject: [PATCH] Fix compile error (#3162)

Summary:
`WorkerThread.h` uses `std::function` but it does not have `#include <functional>` and this causes compile errors in some cases. This simple PR fixes this issue.

Pull Request resolved: https://github.com/facebookresearch/faiss/pull/3162

Reviewed By: mlomeli1

Differential Revision: D51987803

Pulled By: algoriddle

fbshipit-source-id: 21db00a7c9836e83401bb2c82e86a49c80d52f88
---
 faiss/utils/WorkerThread.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/faiss/utils/WorkerThread.h b/faiss/utils/WorkerThread.h
index 72529be0a3..3f2377eba2 100644
--- a/faiss/utils/WorkerThread.h
+++ b/faiss/utils/WorkerThread.h
@@ -9,6 +9,7 @@
 
 #include <condition_variable>
 #include <deque>
+#include <functional>
 #include <future>
 #include <thread>