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Re: [Chicken-users] return a float from foreign function

From: Shawn Rutledge
Subject: Re: [Chicken-users] return a float from foreign function
Date: Sun, 27 Aug 2006 23:46:22 -0700

On 8/27/06, John Cowan <address@hidden> wrote:
Shawn Rutledge scripsit:

> impl.c:
> #include <math.h>
> float baz(int i)
> {
>        return (((float)i) / 15.2);
> }

Note that "float" in Chicken foreign types is a synonym for "double",
whereas "float" in C means single-float and "double" means double-float.
So you need to change the C code to say "double" in both place
in order to get this to work at all (except by luck).

That doesn't seem to be enough.

double baz(int i)
       return (double)i / 2.35;

(define baz (foreign-lambda float "baz" int))
(display baz)
(display (baz 42))

#<procedure (baz a25)>42.0

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