Re: regarding the struct by value patch

Yes, callbacks were a motivation for the work. For instance, I am able to write:

(sb-alien:with-alien-callable
((visitor-fn sb-alien:int
((child (sb-alien:struct cxcursor))
(parent (sb-alien:struct cxcursor))
(client-data sb-alien:system-area-pointer))
(declare (ignore parent client-data))
(handler-case
(let ((result (funcall *visitor-callback* child)))
(if (integerp result) result +cxchildvisit-continue+))
(error ()
+cxchildvisit-break+))))
(clang-visitchildren cursor
(sb-alien:alien-sap visitor-fn)
(sb-sys:int-sap 0)))

The unit tests are in the patch, and visible at:

https://github.com/jbouwman/sbcl/blob/struct-by-value-final/tests/alien-struct-by-value.impure.lisp#L498-L612

[sbcl/tests/alien-struct-by-value.impure.lisp at struct-by-value-final · jbouwman/sbcl](https://github.com/jbouwman/sbcl/blob/struct-by-value-final/tests/alien-struct-by-value.impure.lisp#L498-L612)
[github.com](https://github.com/jbouwman/sbcl/blob/struct-by-value-final/tests/alien-struct-by-value.impure.lisp#L498-L612)	[apple-touch-icon-180x180-a80b8e11abe2.png](https://github.com/jbouwman/sbcl/blob/struct-by-value-final/tests/alien-struct-by-value.impure.lisp#L498-L612)

> On Jan 13, 2026, at 6:11 PM, Andrew Wolven <[email protected]> wrote:
>
> Does that include callbacks or just calling out?

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