preprocessor

[bel28kent]

It may be useful to have a preprocessor that checks the data when it is read from file. The preprocessor would verify that the data matches certain assumptions, e.g. records with *v have only one pair of joins on them. On the other hand, the preprocessor could be irrelevant if exception handling is implemented in the functions. In the latter case, a function that works with *v would throw an error if the record had more than two *v on it.