diff --git a/parser/parser.yy b/parser/parser.yy
index c0b8d5a..63a450f 100644
--- a/parser/parser.yy
+++ b/parser/parser.yy
@@ -20,7 +20,16 @@ int yywrap()
     return 1;
 }
 
-#define YYSTYPE void *
+class Node
+{
+    public:
+        Node();
+        Node(int type, void * ptr);
+        int type;
+        void * ptr;
+};
+
+#define YYSTYPE Node
 
 %}
 
@@ -185,3 +194,14 @@ int parse(const char * fileName)
     yyparse();
 }
 
+Node::Node()
+{
+    type = -1;
+    ptr = NULL;
+}
+
+Node::Node(int type, void * ptr)
+{
+    this->type = type;
+    this->ptr = ptr;
+}