X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fadd.h;h=94d5c8e57bb325c2d14b06a3681d99ecbb2e334e;hp=eae04860af7cf0e409de264c86d9b41a25524a8f;hb=216d88c993aada2bffffa32100c23fc7fb4c1844;hpb=c8ba9c6cf819792cbf88d25b324406b67d5cc49a

diff --git a/ginac/add.h b/ginac/add.h
index eae04860..94d5c8e5 100644
--- a/ginac/add.h
+++ b/ginac/add.h
@@ -33,7 +33,6 @@ class add : public expairseq
 	GINAC_DECLARE_REGISTERED_CLASS(add, expairseq)
 	
 	friend class mul;
-	friend class ncmul;
 	friend class power;
 	
 	// other constructors
@@ -44,7 +43,7 @@ public:
 	add(const epvector & v, const ex & oc);
 	add(epvector * vp, const ex & oc);
 	
-	// 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 40;}
@@ -78,9 +77,11 @@ protected:
 };
 
 // utility functions
-inline const add &ex_to_add(const ex &e)
+
+/** Specialization of is_exactly_a<add>(obj) for add objects. */
+template<> inline bool is_exactly_a<add>(const basic & obj)
 {
-	return static_cast<const add &>(*e.bp);
+	return obj.tinfo()==TINFO_add;
 }
 
 } // namespace GiNaC