It is! Although they are being used in a really weird and not normal way here. I found "The Little Book of Rust Macros"[1] to be a really good resource for getting started with Rust's declarative macros. [1]: https://veykril.github.io/tlborm/

Incremental TT munchers: perhaps the most powerful macro parsing technique in Ru

> changing variadic C++ macros into arithmetic expressions I don't know your exact use case but it sounds a little bit hard to me. I guess you want to change things like this. ```cpp add_macro(a, b, c, d); // before a + b + c + d; // after ``` It isn't that easy to do in pattern syntax. The…

A surprising source of slow compile times can be declarative macros in Rust [0]. I believe the core of the problem is that it has to reparse the code to pattern match for the macro. One egregious patter is tt-munchers [1] where your macro is implemented recursively, requiring it to reparse the…

I think we've largely settled on "doing clever things is bad, actually." At least, I have. Your code should be obvious and self-documenting. Relying on language features to do a bunch of stuff behind the scenes more often leads to programs that are hard to debug and perform badly. How many times…

There's much cooler approach: https://veykril.github.io/tlborm/decl-macros/building-blocks.... macro_rules! count { () => (0); ($odd:tt ($a:tt $b:tt)*) => ((count!($($a)*) (count!($($a)*) It uses bit twiddling to avoid generating very big AST and eventually crashing the compiler. Though I have to…

The Little Book of Rust Macros[0] is also worth a look imho, it helped me a lot when I started learning macros. [0] https://veykril.github.io/tlborm/introduction.html

The Little Book of Rust Macros - https://veykril.github.io/tlborm/introduction.html.

The little book of Rust macros (updated)

Note that this version of the book has not been updated since 2016. The updated version is here: https://veykril.github.io/tlborm/introduction.html