diff --git a/aidl_language.h b/aidl_language.h
index c9b3d27..226d8e3 100644
--- a/aidl_language.h
+++ b/aidl_language.h
@@ -679,6 +679,7 @@
   Type GetType() const { return final_type_; }
   const std::string& Literal() const { return value_; }
 
+  bool Evaluate() const;
   virtual bool CheckValid() const;
 
   // Raw value of type (currently valid in C++ and Java). Empty string on error.