use new-style print methods

[ginac.git] / ginac / fail.h

diff --git a/ginac/fail.h b/ginac/fail.h
index 240509239851bdd68e4ec0810d9978fa07820a5f..75a75bfcc10a01921228d7e2bce23939b3882874 100644 (file)
--- a/ginac/fail.h
+++ b/ginac/fail.h
@@ -1,10 +1,10 @@
 /** @file fail.h
  *
  *  Interface to class signaling failure of operation. Considered obsolete
- *  (all of this is replaced by exceptions). */
+ *  somewhat obsolete (most of this can be replaced by exceptions). */
 
 /*
- *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2003 Johannes Gutenberg University Mainz, Germany
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -32,11 +32,13 @@ class fail : public basic
 {
        GINAC_DECLARE_REGISTERED_CLASS(fail, basic)
        
-       // functions overriding virtual functions from bases classes
-public:
-       void print(const print_context & c, unsigned level = 0) const;
+       // functions overriding virtual functions from base classes
 protected:
-       unsigned return_type(void) const { return return_types::noncommutative_composite; };
+       unsigned return_type() const { return return_types::noncommutative_composite; };
+
+       // non-virtual functions in this class
+protected:
+       void do_print(const print_context & c, unsigned level) const;
 };
 
 /** Specialization of is_exactly_a<fail>(obj) for fail objects. */