Extending and Interfacing this Library

## 6.5 Extending and Interfacing this Library

Because of the mapping of symbols to integers, new constraints over symbolic variables can be implemented simply by placing numeric (IC) constraints on the corresponding integer variables.

Similarly, the facilities of the ic_search library can be exploited when working with symbolic variables. Instead of labeling the symbolic variables, one can use the various facilities of ic_search to label the corresponding integer variables instead.