1 files changed, 2 insertions, 1 deletions
diff --git a/node/executionnode.h b/node/executionnode.h
index 920ef56..a179c5d 100644
--- a/node/executionnode.h
+++ b/node/executionnode.h
@@ -2,7 +2,7 @@
 #define EXECUTIONNODE_H
 
 #include "result.h"
-
+#include <QDebug>
 class ExecutionNode
 {
 public:
@@ -12,6 +12,7 @@ public:
     Result* getResult();
     void setNextNode(ExecutionNode*);
     ExecutionNode* getNextNode();
+    virtual QString toString()const=0;
 protected:
     Result* m_result;
     ExecutionNode* m_nextNode;