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Re: [Chicken-users] FFI and references

From: Joel Reymont
Subject: Re: [Chicken-users] FFI and references
Date: Mon, 3 Jan 2005 15:47:46 +0000

> felix winkelmann wrote:

>This is likely to break. getPixel returns a color instance,
>but the result-value unmarshalling will take it's address and return a
>which (AFAIK) would on return from the wrapper procedure be deallocated.
>Does getPixel return a true instance or a reference? Actually the
>C++ compiler should complain in both cases.

The following works just fine provided that you pass (slot-ref 'this
color) into print-color:

(declare (unit foo))
(declare (uses tinyclos)
         (uses color))

#include "color.hpp"

extern void print_color(const color& c);


(define-foreign-type color (ref "color"))

(define print-color (foreign-lambda void "print_color"


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