From 6a52b3ff4ae9074d277ab2213aa1e318dec765c4 Mon Sep 17 00:00:00 2001
From: Billy O'Neal <billy.oneal@gmail.com>
Date: Thu, 20 Sep 2018 02:49:15 -0700
Subject: [PATCH] Add missing <functional> header which the standard requires
 and will be necessary to use std::function in VS2019. (#18989)

---
 cocos/audio/win32/AudioCache.h  | 7 ++++---
 cocos/audio/win32/AudioPlayer.h | 3 ++-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/cocos/audio/win32/AudioCache.h b/cocos/audio/win32/AudioCache.h
index a23dab49d4..b3c58f10ba 100644
--- a/cocos/audio/win32/AudioCache.h
+++ b/cocos/audio/win32/AudioCache.h
@@ -29,10 +29,11 @@
 
 #if CC_TARGET_PLATFORM == CC_PLATFORM_WIN32
 
-#include <string>
-#include <mutex>
-#include <vector>
+#include <functional>
 #include <memory>
+#include <mutex>
+#include <string>
+#include <vector>
 #ifdef OPENAL_PLAIN_INCLUDES
 #include <al.h>
 #else
diff --git a/cocos/audio/win32/AudioPlayer.h b/cocos/audio/win32/AudioPlayer.h
index 0dacf7a7fb..a7f8a579ed 100644
--- a/cocos/audio/win32/AudioPlayer.h
+++ b/cocos/audio/win32/AudioPlayer.h
@@ -29,9 +29,10 @@
 
 #if CC_TARGET_PLATFORM == CC_PLATFORM_WIN32
 
-#include <string>
 #include <condition_variable>
+#include <functional>
 #include <mutex>
+#include <string>
 #include <thread>
 #ifdef OPENAL_PLAIN_INCLUDES
 #include <al.h>