BluetoothGattDescriptor.hpp added functional header

Signed-off-by: Vadim Panov <[email protected]>

Author: panovvv

api/tinyb/BluetoothGattDescriptor.hpp

@@ -25,6 +25,7 @@
 #pragma once
 #include "BluetoothObject.hpp"
 #include <vector>
+#include <functional>
 
 /* Forward declaration of types */
 struct _Object;