From: Richard Kreckel <kreckel@ginac.de>
Date: Mon, 18 Apr 2016 20:18:20 +0000 (+0200)
Subject: Update reference to Robert C. Martin's "Acyclic Visitor" paper.
X-Git-Tag: release_1-7-0~2
X-Git-Url: https://www.ginac.de/ginac.git/tutorial/ginac.git?a=commitdiff_plain;h=1c65b3c7d04ab7123bbc7fc9e420c8bd484927a1;p=ginac.git

Update reference to Robert C. Martin's "Acyclic Visitor" paper.

The source at objectmentor.com has been unavailble for a long while.
---

diff --git a/ginac/basic.h b/ginac/basic.h
index 3ae3282c..1af6f858 100644
--- a/ginac/basic.h
+++ b/ginac/basic.h
@@ -92,7 +92,8 @@ struct map_function {
 
 /** Degenerate base class for visitors. basic and derivative classes
  *  support Robert C. Martin's Acyclic Visitor pattern (cf.
- *  http://objectmentor.com/publications/acv.pdf). */
+ *  http://condor.depaul.edu/dmumaugh/OOT/Design-Principles/acv.pdf
+ *  or chapter 10 of Andrei Alexandrescu's "Modern C++ Design"). */
 class visitor {
 protected:
 	virtual ~visitor() {}