I'm using `std::function` and `std::vector` in the implementation, which allocates. I haven't written any benchmark, but I assume this would be the bottleneck.

I'm using `std::function` and `std::vector` in the implementation, which allocates. I haven't written any benchmark, but I assume this would be the bottleneck. I made this tool for a small CLI utility not concerned about performance. I'd be happy to receive recommendations (and even PRs) though.