36 lines
1.2 KiB
Scheme
36 lines
1.2 KiB
Scheme
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;;;; type-checks-numbers.ratnum.scm -*- Scheme -*-
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;;;; Kon Lovett, Jun '18
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(module (type-checks-numbers ratnum)
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(;export
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check-ratnum
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check-positive-ratnum check-non-negative-ratnum check-negative-ratnum
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check-non-positive-ratnum)
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(import scheme)
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(import (chicken base))
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(import (chicken module))
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(import (chicken type))
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(import type-checks-basic)
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(import (type-errors-numbers ratnum))
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(: check-ratnum (* ratnum #!optional * -> ratnum))
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(: check-positive-ratnum (* ratnum #!optional * -> ratnum))
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(: check-non-negative-ratnum (* ratnum #!optional * -> ratnum ))
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(: check-negative-ratnum (* ratnum #!optional * -> ratnum))
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(: check-non-positive-ratnum (* ratnum #!optional * -> ratnum))
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(define (positive-ratnum? x) (and (ratnum? x) (positive? x)))
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(define (non-negative-ratnum? x) (and (ratnum? x) (or (zero? x) (positive? x))))
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(define (negative-ratnum? x) (and (ratnum? x) (negative? x)))
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(define (non-positive-ratnum? x) (and (ratnum? x) (or (zero? x) (negative? x))))
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(define-check-type ratnum)
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(define-check-type positive-ratnum)
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(define-check-type non-negative-ratnum)
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(define-check-type negative-ratnum)
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(define-check-type non-positive-ratnum)
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) ;module (type-checks-numbers ratnum)
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