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add tryinto instances for integer types to floats #900

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May 4, 2023
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add tryinto instances for integer types to floats #900

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36 changes: 36 additions & 0 deletions library/math/conversions.lisp
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Original file line number Diff line number Diff line change
Expand Up @@ -182,5 +182,41 @@ cannot be represented in :TO. These fall into a few categories:
(Err "Integer to Double-Float conversion out-of-range")
(Ok y)))))))

(cl:eval-when (:compile-toplevel :load-toplevel)
(cl:defmacro integer-tryinto-float (integer lisp-float float pow)
`(define-instance (TryInto ,integer ,float)
(define (tryInto x)
(lisp (Result String ,float) (x)
(cl:if (cl:and (cl:> x (cl:expt -2 ,pow)) (cl:< x (cl:expt 2 ,pow)))
(cl:let ((y (cl:coerce x ',lisp-float)))
(cl:if (cl:null y)
(cl:error `,(cl:concatenate 'string (cl:symbol-name ,integer) "to " (cl:symbol-name ,float) " conversion out-of-range"))
(Ok y)))
(Err `,(cl:concatenate 'string "Given integer" "is not within " "(-2^" (write-to-string ,pow) ", " "2^" (write-to-string ,pow) ")"))))))))

(coalton-toplevel
;; Single Float
(integer-tryinto-float I64 cl:single-float Single-Float 24)

(integer-tryinto-float U64 cl:single-float Single-Float 24)

(integer-tryinto-float IFix cl:single-float Single-Float 24)

(integer-tryinto-float UFix cl:single-float Single-Float 24)

(integer-tryinto-float U32 cl:single-float Single-Float 24)

(integer-tryinto-float I32 cl:single-float Single-Float 24)

;; Double Float
(integer-tryinto-float I64 cl:double-float Double-Float 53)

(integer-tryinto-float U64 cl:double-float Double-Float 53)

(integer-tryinto-float IFix cl:double-float Double-Float 53)

(integer-tryinto-float UFix cl:double-float Double-Float 53))


#+sb-package-locks
(sb-ext:lock-package "COALTON-LIBRARY/MATH/CONVERSIONS")