* Some internal reorganization WRT flyweight handling and initialization,

[ginac.git] / ginac / numeric.h

diff --git a/ginac/numeric.h b/ginac/numeric.h
index 6599ffbc681245004f009aa31ccb35b7f17bb80f..eec54fff97b8386e1dd64bfad5892854b228e72f 100644 (file)
--- a/ginac/numeric.h
+++ b/ginac/numeric.h
@@ -96,7 +96,7 @@ public:
 protected:
        /** Implementation of ex::diff for a numeric always returns 0.
         *  @see ex::diff */
-       ex derivative(const symbol &s) const { return _ex0(); }
+       ex derivative(const symbol &s) const { return 0; }
        bool is_equal_same_type(const basic &other) const;
        unsigned calchash(void) const;