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Can someone explain the magic sauce that makes this work?

I pretty much explain all that in the article[1], but here is the gist of it:

* I implemented smalloc and sfree to respectively allocate and deallocate a memory block with prepended metadata

* I use a GNU variable attribute called cleanup to run sfree when the variable goes out of scope

* I made some macros to have some syntactic sugar on top of that

Thanks, the link I was clicking went straight to the Github repo. Did not see the article.