I'm creating a few temporary macros in c++ just for readibility (from this answer to Self-unrolling macro loop in C/C++). I was wondering what was the best way I could name those single-use macros (I was thinking about something like preceding the macros with _ or __ but they seem to be already taken according to this answer to What are the rules about using an underscore in a C++ identifier?). I'm assuming that the M_ prefix indicates that those are macros, not specifically temporary/single-use ones.
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