alt Hacker NewsYes, but... even if you know that it is APL inspired, that does not change the fact that this is not how you want to write C.
The C pre-processor is probably one of the most abused pieces of the C toolchain and I've had to clean up more than once after a 'clever' programmer left the premises and their colleagues had no idea of what they were looking at. Just don't. Keep it simple, and comment your intent, not what the code does. Use descriptive names. Avoid globally scoped data and functions with side effects.
That doesn't look smart and it won't make you look smart, but it is smart because the stuff you build will be reliable, predictable and maintainable.
Layman question: say you have a C codebase with a bunch of preprocessor macros and you want to get rid of a particular one that's too clever, and assume no other macros depend on it.
Is it possible to command the preprocessor to take the source files as input and print them out with that one particular macro expanded and no other changes?
Intuitively, it sounds like it should be possible, and then you'd end up with a code base with a bunch of repetition but one fewer too-clever abstraction - and refactoring to deal with repetition (if necessary!) is a far more approachable and well-understood problem.
(Kind of like how some fancy compiles-to-javascript languages have a literal 'mytool --escape' command that will turn the entire code base into a plain, non-minified javascript in case you ever want to stop using them.)