layers: Fix core_validation compilation error

Change-Id: I1ed4fffbf607465239afbce4d7d28b11bceaa548

diff --git a/layers/core_validation.h b/layers/core_validation.h
index 092eaac3e19492a472317e89083e1afd7197a8bf..8d8941f55f1b5f1216cd8efd2ff96eee4b42f61b 100644 (file)
--- a/layers/core_validation.h
+++ b/layers/core_validation.h
@@ -37,6 +37,7 @@
 #include <vector>
 #include <unordered_map>
 #include <memory>
+#include <functional>
 
 using std::vector;