[GiNaC-list] small documentation fix

[Sheplyakov Alexei]

Hello!

Documentation on writing GiNaC classes contains code which won't even
compile. Here is a fix:

Index: doc/tutorial/ginac.texi
===================================================================
RCS file: /home/cvs/GiNaC/doc/tutorial/ginac.texi,v
retrieving revision 1.159.2.13
diff -r1.159.2.13 ginac.texi
7774c7774
< cout << e.bp->class_name() << endl;
---
> cout << ex_to<basic>(e).class_name() << endl;


-- 
All science is either physics or stamp collecting.

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