Add missing <functional> header which the standard requires and will be necessary to use std::function in VS2019. (cocos2d#18989)

BillyONeal · minggo · commit 6a52b3ff4ae9 · 2018-09-20T17:49:15.000+08:00
diff --git 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 <functional>
+#include <memory>
 #include <mutex>
+#include <string>
 #include <vector>
-#include <memory>
 #ifdef OPENAL_PLAIN_INCLUDES
 #include <al.h>
 #else
diff --git 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>
