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tuples

cardinal? --------- (cardinal? n)

couple ------ (couple x y) "constructor for a tuple storing two items"

couple-left ----------- (couple-left tup) "returns the left item of a couple"

couple-right ------------ (couple-right tup) "returns the right item of a couple"

couple? ------- (couple? x) "tests for a tuple storing two items"

empty ----- (empty) "constructor for an empty tuple"

empty? ------ (empty? x) "tests for an empty tuple"

list->tuple ----------- (list->tuple lst) "transforms a list into a tuple" (domain: (list? lst)) (range: (tuple? result))

single ------ (single xpr) "package xpr into a box so that it can be modified" (domain: (true? xpr)) (range: (procedure? result))

single-state ------------ (single-state sg) "returns the state of a single sg"

single-state! ------------- (single-state! sg arg) "modifies the state of a single sg to new"

single-state% ------------- (single-state% sg . args) "replaces state of sg with (car args), returns its state if (null? args)" (domain: (single? sg) (<= (length args) 1)) (state: state) (invariant: (true? state)) (state: (old new)) (effect: (equal? new (car args)))

single? ------- (single? xpr) "check, if xpr evaluates to a single"

triple ------ (triple x y z) "constructor for a tuple storing two items"

triple-left ----------- (triple-left tup) "returns the left item of a triple"

triple-middle ------------- (triple-middle tup) "returns the middle item of a triple"

triple-right ------------ (triple-right tup) "returns the right item of a triple"

triple? ------- (triple? x) "tests for a tuple storing two items"

true? ----- (true? x)

tuple ----- (tuple . args) "tuple constructor" (domain: (true? args)) (range: (tuple? result) "a routine which chooses from a selector")

tuple->list ----------- (tuple->list tup) "transforms a tuple into a list" (domain: (tuple? tup)) (range: (list? result))

tuple-append ------------ (tuple-append . tups) "constructs a new tuple by concatenating several others" (domain: ((list-of? tuple?) tups)) (range: (tuple? result))

tuple-find ---------- (tuple-find tup item compare?) "checks by comparing with compare? if item is contained in tup" (domain: (tuple? tup) (procedure? compare?) "a two parameter predicate") (range:

 (or (not result) (and (cardinal? result) (< result (tuple-length tup)))))

tuple-for-each -------------- (tuple-for-each proc tup) "apply a one parameter procedure to each item of tup" (domain: (tuple? tup) (procedure? proc) "a one parameter procedure")

tuple-left ---------- (tuple-left tup) "returns the leftmost item of tup" (domain: (tuple? tup) (positive? (tuple-length tup)))

tuple-length ------------ (tuple-length tup) "returns the number of tuple items" (domain: (tuple? tup)) (range: (cardinal? result))

tuple-map --------- (tuple-map fn tup) "constructs a new tuple by mapping each item of tup with function fn" (domain: (tuple? tup) (procedure? fn) "a one parameter function") (range: (tuple? result))

tuple-of? --------- (tuple-of? ok?) "checks, if each tuple item satisfies predicate ok?" (domain: (procedure? ok?) "ok? is a one parameter predicate") (range: (procedure? result) "result is a one parameter predicate")

tuple-ref --------- (tuple-ref tup n) "returns the n'th item of tup, counting from zero" (domain: (tuple? tup) (cardinal? n) (< n (tuple-length tup)))

tuple-right ----------- (tuple-right tup) "returns the rightmost item of tup" (domain: (tuple? tup) (>= (tuple-length tup) 2))

tuple? ------ (tuple? xpr) "checks if xpr evaluates to a tuple"

...

License

Copyright (c) 2011, Juergen Lorenz
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Version History

0.1

initial import