unsigned return_type(void) const { return return_types::noncommutative; }
unsigned return_type_tinfo(void) const { return TINFO_color + representation_label; }
+ // non-virtual functions in this class
+public:
+ unsigned char get_representation_label(void) const {return representation_label;}
+
// member variables
private:
unsigned char representation_label; /**< Representation label to distinguish independent color matrices coming from separated fermion lines */
/** This returns the linear combination d.a.b.c+I*f.a.b.c. */
ex color_h(const ex & a, const ex & b, const ex & c);
+/** Calculate the trace of an expression containing color objects with a
+ * specified representation label.
+ *
+ * @param rl Representation label */
+ex color_trace(const ex & e, unsigned char rl = 0);
+
} // namespace GiNaC