Re: Minimal example of extending Guile with Rust?

[Olivier Dion]

On Mon, 29 Jan 2024, "Dr. Arne Babenhauserheide" <arne_bab@web.de> wrote:

[...]

> Ideally with a fast Scheme-to-Rust-to-Scheme interface (similar to the
> native C arrays numpy exposes to C that allow getting the speed of C).

See <https://doc.rust-lang.org/nomicon/ffi.html>.  There is many path to
do this.  The main issue is the calling convention.

Rust functions that you want binding for must follow the C calling
convention by using `extern "C"'.  Otherwise, the calling convention of
the compiler is used (AFAIK, Rust does not define a calling convention).
You can then simply use the system foreign interface as usual as if the
Rust functions were C functions.

There are others thing to consider.  Structures in Rust must have the
attribute `#[repr(C)]' to follow the C ABI for structure members layout.
Otherwise, the compiler is free to re-order members.

Then there is callbacks .. and other things ..

The above link gives comments on all of this but not much details.

Hope that helps.

-- 
Olivier Dion
oldiob.dev