+ /** Return a vector containing the object's indices. */
+ exvector get_indices(void) const;
+
+ /** Return a vector containing the dummy indices of the object, if any. */
+ exvector get_dummy_indices(void) const;
+
+ /** Return a vector containing the dummy indices in the contraction with
+ * another indexed object. */
+ exvector get_dummy_indices(const indexed & other) const;
+