The study blog from marearts.com
Computer Vision & Machine Learning Research Laboratory
def sensor_id(sensor: Sensor | int | None) -> int has three bars in one signature and
looks like bit arithmetic. It is not arithmetic and it is not new syntax to memorise: each bar is the
word or, and the whole annotation is one sentence — "a Sensor, or an
int, or nothing".
MareArts ANPR is a license-plate recognition app for iOS and Android, with a web viewer and a desktop viewer on the same account. Plates are read on the phone. Cloud MMC (make, model, colour, type, side, nation), team sync, rules, maps, and stats sit on marearts.com.
Two acronyms one letter apart, describing promises made at two different moments. An API is what you agree to when you write the call. An ABI is what your compiled bytes agree to when they meet somebody else's compiled bytes — and unlike the API, breaking it usually produces no error at all.
C forgets the name of every field the moment it finishes compiling. The X-macro is how a C
programmer gets those names back — by writing the list once and replaying it as an enum, a string
table, a descriptor table, and a set of registration calls that run before main.