# SRFI 128 - Comparators

The `(srfi 128)` provides comparators, which bundle a type test predicate, an equality predicate, an ordering predicate, and a hash function into a single Scheme object. By packaging these procedures together, they can be treated as a single item for use in the implementation of data structures.

See the [SRFI document](http://srfi.schemers.org/srfi-128/srfi-128.html) for more information.

- [`comparator?                   `](#comparator)
- [`comparator-ordered?           `](#comparator-ordered)
- [`comparator-hashable?          `](#comparator-hashable)
- [`make-comparator               `](#make-comparator)
- [`make-pair-comparator          `](#make-pair-comparator)
- [`make-list-comparator          `](#make-list-comparator)
- [`make-vector-comparator        `](#make-vector-comparator)
- [`make-eq-comparator            `](#make-eq-comparator)
- [`make-eqv-comparator           `](#make-eqv-comparator)
- [`make-equal-comparator         `](#make-equal-comparator)
- [`boolean-hash                  `](#boolean-hash)
- [`char-hash                     `](#char-hash)
- [`char-ci-hash                  `](#char-ci-hash)
- [`string-hash                   `](#string-hash)
- [`string-ci-hash                `](#string-ci-hash)
- [`symbol-hash                   `](#symbol-hash)
- [`number-hash                   `](#number-hash)
- [`make-default-comparator       `](#make-default-comparator)
- [`default-hash                  `](#default-hash)
- [`comparator-register-default!  `](#comparator-register-default)
- [`comparator-type-test-predicate`](#comparator-type-test-predicate)
- [`comparator-equality-predicate `](#comparator-equality-predicate)
- [`comparator-ordering-predicate  `](#comparator-ordering-predicate)
- [`comparator-hash-function      `](#comparator-hash-function)
- [`comparator-test-type          `](#comparator-test-type)
- [`comparator-check-type         `](#comparator-check-type)
- [`comparator-hash               `](#comparator-hash)
- [`hash-bound                    `](#hash-bound)
- [`hash-salt                     `](#hash-salt)
- [`=?                            `](#=?)
- [`<?                            `](#<?)
- [`>?                            `](#>?)
- [`<=?                           `](#<=?)
- [`>=?                           `](#>=?)
- [`comparator-if<=>              `](#comparator-if<=>)

#comparator?

#comparator-ordered?

#comparator-hashable?

#make-comparator

#make-pair-comparator

#make-list-comparator

#make-vector-comparator

#make-eq-comparator

#make-eqv-comparator

#make-equal-comparator

#boolean-hash

#char-hash

#char-ci-hash

#string-hash

#string-ci-hash

#symbol-hash

#number-hash

#make-default-comparator

#default-hash

#comparator-register-default!

#comparator-type-test-predicate

#comparator-equality-predicate

#comparator-ordering-predicate

#comparator-hash-function

#comparator-test-type

#comparator-check-type

#comparator-hash

#hash-bound

#hash-salt

#=?

#<?

#>?

#<=?

#>=?

#comparator-if<=>