* Fix thinkos in print_csrc context.

[ginac.git] / ginac / add.h

diff --git a/ginac/add.h b/ginac/add.h
index eae04860af7cf0e409de264c86d9b41a25524a8f..94d5c8e57bb325c2d14b06a3681d99ecbb2e334e 100644 (file)
--- 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