[Bf-blender-cvs] [0176b0f2171] virtual-array-attributes: add missing include

[Jacques Lucke]

Commit: 0176b0f217182e4d55645c2095dd92088439fc08
Author: Jacques Lucke
Date:   Sat Apr 17 14:49:00 2021 +0200
Branches: virtual-array-attributes
https://developer.blender.org/rB0176b0f217182e4d55645c2095dd92088439fc08

add missing include

===================================================================

M	source/blender/functions/FN_generic_virtual_array.hh

===================================================================

diff --git a/source/blender/functions/FN_generic_virtual_array.hh b/source/blender/functions/FN_generic_virtual_array.hh
index c649623997d..00f6cacd2e1 100644
--- a/source/blender/functions/FN_generic_virtual_array.hh
+++ b/source/blender/functions/FN_generic_virtual_array.hh
@@ -23,6 +23,8 @@
  * the data type is only known at runtime.
  */
 
+#include <optional>
+
 #include "BLI_virtual_array.hh"
 
 #include "FN_generic_span.hh"