2.38.8.1 General comparators

Function: make-comparator type-test equality compare hash

Return a comparator which bundles the type-test, equality, compare, and hash procedures provided. As a convenience, the following additional values are accepted:

• If type-test is #t: a type-test procedure that accepts any arguments is provided.
• If equality is #t: an equality predicate is provided that returns #t if and only if compare returns 0.
• If compare or hash is #f, a procedure is provided that signals an error on application. The predicates comparator-comparison-procedure? and/or comparator-hash-function?, respectively, will return #f in these cases.