documentation update

[ginac.git] / ginac / mul.h

diff --git a/ginac/mul.h b/ginac/mul.h
index 2808db99addaf9312ad29a9a6d5b06ce9f484193..65a291b7993a2b0216c0791541e117333cb705c0 100644 (file)
--- a/ginac/mul.h
+++ b/ginac/mul.h
@@ -3,7 +3,7 @@
  *  Interface to GiNaC's products of expressions. */
 
 /*
- *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2002 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
@@ -45,7 +45,7 @@ public:
        mul(epvector * vp, const ex & oc);
        mul(const ex & lh, const ex & mh, const ex & rh);
        
-       // functions overriding virtual functions from bases classes
+       // functions overriding virtual functions from base classes
 public:
        void print(const print_context & c, unsigned level = 0) const;
        unsigned precedence(void) const {return 50;}
@@ -90,9 +90,11 @@ protected:
 };
 
 // utility functions
-inline const mul &ex_to_mul(const ex &e)
+
+/** Specialization of is_exactly_a<mul>(obj) for mul objects. */
+template<> inline bool is_exactly_a<mul>(const basic & obj)
 {
-       return static_cast<const mul &>(*e.bp);
+       return obj.tinfo()==TINFO_mul;
 }
 
 } // namespace GiNaC