Notes of a technical nature
09. June 2022
In the C programming language you can ask the macro preprocessor to
keep or remove part of a source file. This is done with #ifdef. The
equivalent in Scheme is called cond-expand. R7RS Scheme has two
different instances of cond-expand, while R6RS Scheme does not have
it all. What does R6RS do instead, and is cond-expand a bad idea?
05. February 2022
I was visiting a friend over the new year and at one point we were playing around with his Leap Motion camera. I realized that the Valve Index uses infrared (IR) and should look cool in the camera.
21. August 2021
Loko Scheme 0.9.0 is now available from:
14. August 2021
I’ve been working on optimizations in Loko Scheme recently and have implemented large parts of A Sufficiently Smart Compiler for Procedural Records (Keep & Dybvig, 2012). At the same time I have improved the representation of record type descriptors and wanted to share a simple trick I used to improve record type checks for non-sealed records. But first I should explain what a record is in Scheme.