It’s use as a programming term originates with Clojure. Outside programming, a transducer is a device that transforms one signal (such as temperature readings from a sensor) into another signal (such as radio waves)

https://en.wikipedia.org/wiki/Finite-state_transducer\|https://en.wikipedia.org/wiki/Finite-state_transducer and related work in EE for converting energy?

> a device that transforms one signal (such as temperature readings from a sensor) into another signal Thanks @notjack .

> An FST will read a set of strings on the input tape and generates a set of relations on the output tape. Thanks @ben.knoble (this reminds me of Theory of Computation).

Very interesting!

Hi folks, what would you recommend as a wrapper layer to call into C++ code from racket? Currently, I am using swig to generate an extension but that does not work with CS and was pretty tough to get going even in BC. Writing & maintaining a hand-written C-layer on top of the C++ code is pretty unappealing too.

Depends. In some cases you can be lucky to find “C bindings” for the C++ library.

Can SWIG produce C bindings for a C++ library?

well, the C++ library is my project (so no C bindings). I have found a couple of references to a 13 year old google summer of code project that built a generator like that. However, they have not merged it into the mainline in the last decade so I don’t think they are going to do it any time soon

Asks them maybe? Sometimes people just need a small nudge.

I think theyre the same (or similar) definitions—fsts look like they’re about relations, which is sort of how I look at transduction (like a mapping between spaces)

If the summer project is more than a decode old, chances are slim.

agreed, I don’t even want to look at my own decade-old code :slightly_smiling_face:

sure, but that won’t cost you much, and who knows

Maybe phrased as “languages that use libffi would benefit from a C backend”?

At least Beazley likes Scheme - he even has a SICP course! http://www.dabeaz.com/courses.html

@soegaard2 he was my professor in college — he’s done lots of cool stuff

@hlgr the handwritten-C approach is sadly what you usually need — FFI to C++ is rather intractable in general

I guess you are right in general though I have had good experiences with swig for other languages (and it mostly works for Racket BC)

Someone recently asked for a copy of code I wrote 30 years ago, for the GNU Objective-C runtime. I know where the code is. It’s on a NeXT optical disk, I think in my attic, which only my old NeXT cube can read. Several years ago I lent my cube to my high school / college friend, who tends to disappear for 2–10 years at a time. I guess I’m due to hear from him. I think I’m also due to hear from the Yellowstone caldera, which is overdue as well.

how small can racket get ? e.g say you want to embedd it as the scripting lang for your game minimal racket is 40MB? BC was 8MB!!