I have never discovered a reliable way to discern whether I will re-use some code. Of course I could just delete it after first use and declare it "use-once" that way, but that's cheating, if I just have to type in the same program tomorrow we should admit that deleting it and rewriting it was a pessimisation.

In the specific case of volatile parameters I can't figure out whether writing this in use-once code is more stupid or less stupid. On the one hand, you aren't misleading anybody else because the compiler knows perfectly well this doesn't do anything, on the other hand with the only human participant being yourself maybe you think it does something and whatever that is you're wrong so that's very bad.