@@ -156,6 +156,11 @@
 
 /**
  * \brief Deletes all whitespaces at the beginning and the end of the string.
  */
 - (void)deleteEnclosingWhitespaces;
+
+/**
+ * \brief Converts the mutable string to an immutable string.
+ */
+- (void)makeImmutable;
 @end