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@ -15,7 +15,7 @@
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(local
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[(define-generics (lots)
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(f #:foo foo lots zog [def]))
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(define-struct ex ()
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#:methods gen:lots
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[(define (f #:foo foo lots zog [def #t])
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@ -24,11 +24,11 @@
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(f #:foo 3 (make-ex) 2) => 1
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(f (make-ex) #:foo 3 2) => 1
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(f (make-ex) 2 #:foo 3) => 1))
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(local
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[(define-generics (lots)
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(f #:foo foo lots zog #:def [def]))
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(define-struct ex ()
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#:methods gen:lots
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[(define (f #:foo foo lots zog #:def [def #t])
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@ -37,11 +37,11 @@
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(f #:foo 3 (make-ex) 2) => 1
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(f (make-ex) 4 #:foo 3 #:def 2) => 1
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(f (make-ex) 3 #:foo 1) => 1))
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(local
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[(define-generics (lots)
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(f lots idx val))
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(define-struct ex ()
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#:methods gen:lots
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[(define/generic gen:f f)
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@ -51,13 +51,13 @@
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(gen:f lots (sub1 idx) (* 2 val))))])]
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(test
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(f (make-ex) 4 1) => (expt 2 4)))
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(local
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(local
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[(define-generics (table)
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(get table idx [default])
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(weird-get idx table)
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(put! table idx new))
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(define-struct alist ([l #:mutable])
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#:methods gen:table
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((define (get table idx [default #f])
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@ -71,43 +71,43 @@
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(if prev
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(set-mcar! prev new)
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(set-alist-l! table (mcons (mcons idx new) (alist-l table))))))))]
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(test
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(make-alist empty)
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(get (make-alist empty) 'foo) => #f
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(local [(define t (make-alist empty))]
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(put! t 'foo 1)
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(get t 'foo))
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=>
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1
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(weird-get 'foo (make-alist empty)) => #f
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(local [(define t (make-alist empty))]
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(put! t 'foo 1)
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(weird-get 'foo t))
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=>
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1))
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(test
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(define-generics (table)
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(get idx [default]))
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=error>
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"No required by-position generic argument"
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(define-generics (table)
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(get idx [table] [default]))
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=error>
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"No required by-position generic argument")
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(local [(define-generics (printable)
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(gen-print printable [port])
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(gen-port-print port printable)
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(gen-print* printable [port] #:width width #:height [height]))
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(define-struct num (v)
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#:methods gen:printable
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((define/generic super-print gen-print)
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@ -117,7 +117,7 @@
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(super-print n port))
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(define (gen-print* n [port (current-output-port)] #:width w #:height [h 0])
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(fprintf port "Num (~ax~a): ~a" w h (num-v n)))))
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(define-struct bool (v)
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#:methods gen:printable
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((define/generic super-print gen-print)
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@ -127,14 +127,14 @@
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(super-print b port))
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(define (gen-print* b [port (current-output-port)] #:width w #:height [h 0])
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(fprintf port "Bool (~ax~a): ~a" w h (if (bool-v b) "Yes" "No")))))
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(define x (make-num 10))
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(define y (make-bool #t))]
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(test
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(gen-print x)
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(gen-port-print (current-output-port) x)
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(gen-print* x #:width 100 #:height 90)
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(gen-print y)
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(gen-port-print (current-output-port) y)
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(gen-print* y #:width 100 #:height 90))))
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